Answer:
The answer is B
Explanation:
according to the diagram, which shows the earth during the northern hemisphere winter solstice, how many hours of sunlight will the north pole receive on this day?
The north pole will receive 0 hours of sunshine on this day, which is the northern hemisphere solstice.
Where does the Northern Hemisphere take place?Northern Earth is inclined toward the Sun for a portion of our orbit. In the northern hemisphere, it is summer right now, which means there are longer daylight hours, a higher Sun, and more direct Sun rays hitting the ground, which results in warmer temperatures. Light is always present at the north pole!
What nation is at the planet's center?Based on a 2003 estimate, Skilip, Turkey, was determined to be the geographic center of all surface waters on Earth. It is the place here on surface of the Earth where the total distances to all places on land are least, to put it another way.
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10. Which of the following statements BEST describes emotional intelligence?
Emotional intelligence is easily assessed.
Emotional intelligence relies on instincts to solve problems.
Emotional intelligence is closely correlated with verbal ability.
Emotional intelligence is the ability to manage personal feelings well and socially more adept.
A circular loop of wire is positioned half in and half out of a square region of uniform magnetic field directed in the +z direction, out of the paper, as shown in the following figure. To induce a counterclockwise current in this loop
To induce a counterclockwise current in the circular loop of wire, you can use Faraday's law of electromagnetic induction.
Faraday's law states that the induced electromotive force (emf) in a closed circuit is equal to the negative of the rate of change of the magnetic flux through the circuit.
In this case, the magnetic field is directed out of the paper and is uniform within the square region. As the loop of wire is positioned half in and half out of the square region, the magnetic flux through the loop will change as the loop moves or as the magnetic field strength changes. This change in magnetic flux will induce an emf in the loop, which will cause a current to flow in the wire.
The direction of the current will be determined by Lenz's law, which states that the induced current will be in the direction that opposes the change in magnetic flux. Since the magnetic field is directed out of the paper and the loop is moving counterclockwise, the induced current will flow counterclockwise.
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Keisha writes that if an object has any external forces acting on it, then the object can be in dynamic equilibrium but not static equilibrium.
The statement best describes Keisha's error is an object in either state of equilibrium must have no net force acting on it. The correct option is D.
What is dynamic equilibrium?
When a system is in a state of dynamic equilibrium, the reversible reaction that is occurring in it no longer changes the ratio of reactants to products, but there is still the movement of substances between the reactants and products.
Because the thing will be moving, it won't be at rest. An object is considered to be static when it is at rest. The external forces that are acting on an object are what will make it move. When external forces are no longer acting on the object, it will travel up to that point.
Therefore, the correct option is D, An object in either state of equilibrium must have no net force acting on it.
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The question is incomplete. Your most probably complete question is given below:
Which statement best describes Keisha's error?
An object that is not moving is always in static equilibrium.
O An object that is moving must be in dynamic equilibrium.
An object in either state of equilibrium must have no forces acting on it.
An object in either state of equilibrium must have no net force acting on it.
sixteen identical wires, each of diameter d and length l, are connected in parallel. the combination has the same resistance as a single similar wire of length l but whose diameter is:
Compared to a single comparable wire of length l but diameter 3d, the combination is the same resistance.
What results in opposition?A conductor, such as an metal wire, acts as a conduit for the flow of electrons, which generate an electric current. With the atoms in the metal, the traveling electrons may collide. Resistant results from this and makes it more challenging for the stream to flow.
Exactly how is resistance measured?Utilizing Ohm's Law, one may determine resistance by measuring the voltage and current. Thus, if the observed values of current and voltage are known, the resistance value of a circuit may be calculated. The measurement of resistance is done using both analog and digital multimeters, which use Ohm's Law as their guiding principle.
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Which statement is true
Cells usually take in large food molecules
Cells can get energy by breaking down molecules from food
Cells use energy to help an organism grow and live
Breaking down molecules does not release energy
Identify the 5 stages of mitosis:
Phase
Picture
What happens
________
Chromosomes are visible, nuclear membrane breaks down, spindle fibers begin to form.
________
Sister chromatids line up at the center of the cell.
________
Sister chromatids are pulled apart and move to opposite poles of the cell.
________
Spindle fibers breakdown, nuclear membrane forms, and chromosomes begin to uncoil and form chromatin.
________
Cytoplasm splits in 2 and the cell divides.
Answer:
the first one is Interphase
the second one is prophase
the third one is metaphase
the fourth one is Anaphase
the last one is Telophase
2. A diverging lens has a focal length of 2.5 cm. If it is placed 4.0 cm from an object, at what distance from the lens will the image be located? Is the image bigger or smaller? Is it real or virtual?
The image distance is 0.65 cm and the image is real but diminished.
What is a diverging lens?We know that for the diverging lens the light appears to be diverged from the source that it come in through. The focal length of the diverging lens is negative and the lens formula is used.
We have;
1/f = 1/u + 1/v
f = focal length
u = object distance
v = image distance
-1/2.5 = 1/4 + 1/v
1/v = 1/4 + 1/2.5
v = 0.25 + 0.4
v = 0.65 cm
The image is real but it is smaller than the object.
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In Fig. 30-46, a stiff wire bent into a semicircle of radius a = 1.4 cm is rotated at constant angular speed 30 rev/s in a uniform 20 mT magnetic field. What are the (a) frequency and (b) amplitude of the emf induced in the loop?
A stiff wire bent into a semicircle of radius a = 1.4 cm. The frequency is 30 Hertz and the amplitude of the emf induced in the loop is 1.16 x 10⁻³ V
Formula for the angular frequency is:
ω = 2πf
Where:
ω = angular frequency (rad/s)
f = frequency (Hertz)
In the given problem,
ω = 30 rev/sec = 30 x 2π rad/s
a) f = ω / 2π
f = 30 x 2π / 2π = 30 Hertz
b) The induced emf is:
ε = Bπ²a²f sin(ωt)
Where:
B = magnetic field
a = radius
In the given problem,
B = 20 x 10⁻³ T
a = 1.4 x 10⁻² m
Hence, the amplitude or the maximum emf is:
ε_max = Bπ²a²f
= (20 x 10⁻³) π² (1.4 x 10⁻²)² (30) = 1.16 x 10⁻³ Volt
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The force of friction oil an airplane in level flight is given by Ff = kv^2, where k is some constant, and v is the speed of the airplane. When the power output from the engines is P0, the plane is able to fly at a speed v0. If the power output of the engines is increased by 100% to 2P0, the airplane will be able to fly at a new speed given by (A) 1.12v0 (B) 1.26v0 (C) 1.41v0 (D) 2.82v0 (E) 8v0
If the power output of the engines is increased by 100% to 2P0, the airplane will be able to fly at a new speed of 1.26[tex]v_{0}[/tex].
As, P = F v
So, P = kv³
Then, v/v0 = [tex]\sqrt[3]{P/P0}[/tex].
Therefore, after substituting the values, the speed will be 1.26[tex]v_{0}[/tex].
What is power?
In physics, power is the amount of energy transferred or converted per unit of time. In the International System of Units, the unit of power is the watt, which is equivalent to 1 joule per second. In older works, force is sometimes called activity. Power is a scalar quantity.
Power is related to other quantities. For example, the power required to move a ground vehicle is the product of drag, wheel traction, and vehicle speed. The power of a motor is the product of the torque produced by the motor and the angular velocity of the output shaft. Similarly, the power dissipated in an electrical element of a circuit is the product of the current through the element and the voltage across the element.
If the power output of the engines is increased by 100% to 2P0, the airplane will be able to fly at a new speed of 1.26[tex]v_{0}[/tex].
As, P = F v
So, P = kv³
Then, v/v0 = [tex]\sqrt[3]{P/P0}[/tex].
Therefore, after substituting the values, the speed will be 1.26[tex]v_{0}[/tex].
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in a physics lab, light with a wavelength of 520 nm travels in air from a laser to a photocell in a time of 16.8 ns . when a slab of glass with a thickness of 0.830 m is placed in the light beam, with the beam incident along the normal to the parallel faces of the slab, it takes the light a time of 21.0 ns to travel from the laser to the photocell.
The speed of light in air is 3.00x10^8 m/s, while the speed of light in glass is 2.00x10^8 m/s.
What is photocell?A photocell, also known as a photoresistor, is a type of electronic component that is sensitive to light. It is made up of a semiconductor material which changes its electrical resistance when exposed to light. Photocells are used in many applications such as street lamps, security systems, digital cameras, and light-dependent resistors. They are also used to control electric motors, dimmers, and light switches.
Given this information, we can calculate the index of refraction of the glass using the equation:
n = (speed of light in air)/(speed of light in glass)
The index of refraction of the glass is thus calculated to be 1.50.
When light passes from the air into the glass, it is refracted, changing its direction. The light is bent away from the normal by an angle θ given by the equation:
sin θ = (index of refraction of glass) x (sin θ/n)
The angle of refraction θ is thus calculated to be 25.8°.
Once the light is refracted, it travels through the glass and is again refracted when it exits the glass. The angle of refraction for the second refraction is calculated to be 25.2°.
The total time it takes for the light to travel from the laser to the photocell is the sum of the time it takes for the light to travel through air.
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An object with charge -q is in motion near a wire that has a current I to the right. At the instant show in the figure, the object is traveling to the right with speed v. Both the wire and the motion of the object are in the plane of the page. Which of the following statements is true about the force on the object due to the current I at the instant shown?
O The force is directed toward the top of the page
O The force is directed toward the bottom of the page.
O The force is directed toward the right.
O There is no force on the object due to the current.
The correct answer is option A). The force is directed toward the top of the page.
When an object with charge q is moving near a wire with current I, the object will experience a force due to the magnetic field generated by the current in the wire. The direction of this force is determined by the right-hand rule.
According to the right-hand rule, if you point your right thumb in the direction of the current and your fingers in the direction of the motion of the charged object, the force on the object will be in the direction your palm is facing.
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A 5.1 g experimental dart is fired into a block
of wood with a mass of 27.5 g. The wood
block is initially at rest on a 2.4 m tall post.
After the collision, the wood block and dart
land 2.1 m from the base of the post.
Find the initial speed of the dart.
Answer in units of m/s.
PLSSSS NEED URGENT
a person attempts to lift a heavy object using several pulleys and a 0.5 inch diameter rope. the first attempt to lift the object is unsuccessful. which of the following will make lifting of the object more likely?
The pulleys can be attached in such a way that the force required to lift the object will be less, and the direction of the pulley can be shifted systematically.
What is force?In the body, force is the result of either a push or a pull. The three main categories of forces are friction, nuclear, and gravitational. For instance, when a hand strikes a wall, the hand puts force on the wall and the wall also exerts a force on the hand. Newton was given a variety of laws to help him understand force.
We can move objects much more easily because of simple machinery called pulleys that can shift the direction of the force. When we employ many pulleys together, they also boost mechanical advantage. By using this method, less force is needed to raise an object.
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why is there no gap in earths crust?
btw this is science it just doesn't appear as science in aa suubject
There is no gap in Earth's crust due to presence of magma beneath the Earth crust which usually erupt to fill the gap in the Earth crust.
What is great unconformity in Earth's crust?There is a temporal gap that exist in Earth's known as the great unconformity.
The great unconformity is a massive temporal gap that can be found famous crevasse and also in most places on the Earth's crust.
However, the great unconformity describes the temporal gap that exist in earth crust which disappears with time.
The presence of magma beneath the earth's crust ensures that there is no gap in Earth's crust as the magma always erupt upward to fill any gap between the Earth's crust and create new crust.
Thus, there is temporal gap in earth crust which disappears with time due to molten magma that erupts to fill the gap and create new crusts.
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If the average hang time of a professional football kick is 4.60 s, then determine the average maximum height.
The average maximum height is what?
The average maximum height will be 103.7m.
What is a Projectile?A projectile is defined as an object that has an initial velocity and follows a path that dependent on the gravitational acceleration.
The gravitational force initially will act on the opposite direction until it reach the maximum height, and right after that, the gravitational force will accelerate the speed of the projectile.
The formular used will be;
[tex]H = \frac{1}{2} gt^{2}[/tex]
In this case, the initial velocity u = 0;
where g = 9.8m/s2
t = 4.6s
[tex]H = \frac{1}{2} (9.8)(4.6)^{2}[/tex]
H = 4.9 x 21.16
H = 103.7m.
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A cyclist enters a curve of 30-m radius at a speed of 12 m/s. As the brakes are
applied, speed is decreased at a constant rate of 0.5 m/s2. What are the magnitudes
of the cyclist’s radial and tangential accelerations when his speed is
10 m/s?
Explanation:
To find the magnitudes of the cyclist's radial and tangential accelerations when his speed is 10 m/s, we can use the equations for radial and tangential acceleration:
Radial acceleration: ar = v^2 / r
Tangential acceleration: at = a - ar
where ar is the radial acceleration, at is the tangential acceleration, v is the speed, r is the radius of the curve, and a is the acceleration (in this case, the deceleration of 0.5 m/s^2).
Plugging in the values given in the problem, we get:
ar = (10 m/s)^2 / (30 m) = 0.33 m/s^2
at = (-0.5 m/s^2) - (0.33 m/s^2) = -0.83 m/s^2
Therefore, the magnitude of the radial acceleration is 0.33 m/s^2, and the magnitude of the tangential acceleration is -0.83 m/s^2.
Note that the negative sign on the tangential acceleration indicates that it is directed opposite to the velocity, which is consistent with the fact that the cyclist is decelerating.
Referring to question 1, what is C1 in uf, omit units.
Enthalpy Changes the overall energy change in the substance portrayed in the graph at 48°C.
What are the data that were obtained from the question?Mass (m) = 0.3 Kg
Initial temperature (T1) = 20°C
Heat (Q) added = 35 KJ
Specific heat capacity (C) = 4.18 KJ/Kg°C
Final temperature (T2)
The final temperature of water can be obtained as follow:
Q = MC(T2 – T1)
35 = 0.3 x 4.18 (T2 – 20)
35 = 1.254 (T2 – 20)
Clear the bracket
35 = 1.254T2 – 25.08
Collect like terms
1254T2 = 35 + 25.08
1.254T2 = 60.08
Divide both side by the coefficient of T2 i.e 1.254
T2 = 60.08/1.254
T2 = 47.9 ≈ 48°C
Therefore, the final temperature of the water is 48°C.
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Define the term e.m.f
EMF is the Electromotive force. It is the electric potential difference which is produced by the cell or the surrounding magnetic field.
What is EMF?
Electromotive force is also known as electromotance or EMF. It is an energy transfer to an electric circuit per unit of the electric charge of the cell or the magnetic field. It is measured in units of volts. Devices which are used to measure electromotive force is called electrical transducers which provide an EMF by converting other forms of energy in the cell into electrical energy.
Other electrical equipment which can also produce an electromotive force, such as the batteries, also convert chemical energy, and generators, the devices which convert mechanical energy. This energy conversion can be achieved through physical forces that are applied physical work on electric charges. However, the electromotive force itself is not a physical force, and for the current ISO/IEC standards that consider the term deprecated, favoring the names which source voltage or source tension instead.
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a copper bar of length and negligible resistance slides at constant speed along metal rails. the bar is moving through a region in which there is a uniform magnetic field directed out of the page. a voltmeter is connected across a resistor of resistance . the resistor is connected to the metal rails as indicated in the diagram. (a) determine the magnitude of the magnetic force acting on the bar and indicate the direction of this force on the diagram. your answer should be in terms of the given variables and known constants.
The magnitude of the magnetic force acting on the bar , Fb is calculated to be = ILB.
What do you understand by magnetic force?Magnetic force is defined as attraction or repulsion that arises between electrically charged particles because of the motion.
Given length , L and negligible resistance
uniform magnetic field, B
a) To determine the magnitude of the magnetic force acting on the bar:
If rod slides down with constant velocity then total force is zero
X direction Fb - NsinФ
= Fb = NsinФ
Y direction, mg - NcosФ
mg = NcosФ
Now, Fb/mg = sinФ / cosФ
Fb = mg tanФ
But: Fb = I L B sinФ
The magnitude of the magnetic force acting on the bar , Fb = ILB.
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A 6.5-N ball is thrown with an initial velocity of 20 m/s at a 35° angle from a
height of 1.5 m.
a. What is the velocity of the ball if it is caught at a height of 1.5 m?
b. If the ball is caught at a height of 1.5 m, how much mechanical work is
required?
Answer:
a. The velocity of the ball, if it is caught at a height of 1.5 m, is [14.9, 19.7] m/s.
To find the velocity of the ball if it is caught at a height of 1.5 m, we can use the equation:
vf^2 = vi^2 + 2ad
Where vf is the final velocity, vi is the initial velocity, a is the acceleration due to gravity (-9.8 m/s^2), and d is the change in position.
Plugging in the values given in the question, we get:
vf^2 = 20^2 + 2*(-9.8 m/s^2)*(1.5 m)
Solving for vf, we get:
vf = [14.9, 19.7] m/s
b. If the ball is caught at a height of 1.5 m, the mechanical work required is 0 J.
To find the mechanical work required, we can use the equation:
work = force * displacement
Plugging in the values given in the question, we get:
work = 6.5 N * (1.5 m - 1.5 m)
Solving for work, we get:
work = 0 J
Therefore, if the ball is caught at a height of 1.5 m, the mechanical work required is 0 J.
The city of London in the United Kingdom is found approximately at the same latitude as the city of Calgary in Canada. Calgary has an average high temperature in December of -4 degrees Celsius, while London has an average high temperature of 8.6 degrees Celsius.What best explains why the average temperature of London is warmer than that of Calgary in December?
The average temperature of London is warmer than that of Calgary in December as the oceanic currents warm the atmosphere in London.
Gravity, wind, and water density are what cause ocean currents, which are the continuous, predictable, directed movement of seawater. There are two directions in which ocean water can move: horizontally and vertically. Vertical shifts are referred to as upwellings or downwellings, while horizontal motions are known as currents.
Long-distance ocean currents combine to form the global conveyor belt, which is a major factor in determining the climate in many parts of the world. Ocean currents specifically affect the temperature of the areas they pass through.
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You should place 2kg mass onto a 0.2 kg block. What is the total weight in newtons ?
The total weight in Newtown is 21.56 N.
What is weight?The weight is an object is to the force of the acting on their object due to gravity.
Weight is a force described by the physics which is due to the gravitation pull of earth mercury is the
It's magnitude can be the calculated by multiplying the mass with the by the acceleration due to gravity but to the
And direction is always to the the centre of earth has
the weight of an object is to the force acting on their object by the due to gravity. Something standard of living textbooks defined as the weight as a vector quantity, the gravtitational enegry and force to the relative acting on the object. Others define define weight as of scalar quantity, to the magnitude of the mangitude gravitational force.
Here earth acceleration due to gravity is g= 9.8 ms^-2
And mass is 2+0.2 = 2.2 kg
So weight is 2.2(9.8)
= 21.56 N
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a 2.6 kg particle moves along an x axis, being propelled by a variable force directed along that axis. its position is given by x
The value of the constant c is -17 m/s2.
What is the variable force about?To find the value of the constant c, you need to use the information given about the position of the particle and the force acting on it at time t = 3.0 s.
The position of the particle at time t = 3.0 s is given by x = 3.0 m + (4.0 m/s)t + ct2 - (2.0 m/s3)t3. Substituting t = 3.0 s into this equation gives:
x = 3.0 m + (4.0 m/s)(3.0 s) + c(3.0 s)2 - (2.0 m/s³)(3.0 s)3
= 3.0 m + 12.0 m + 9c - 54 m/s³
= 3.0 m + 12.0 m - 54 m/s³ + 9c
The force on the particle at time t = 3.0 s has a magnitude of 36 N and is in the negative direction of the x-axis. This means that the force is directed opposite to the direction of the positive x-axis. Since the force is proportional to the acceleration of the particle, the acceleration of the particle at time t = 3.0 s must also be in the negative direction of the x-axis.
The acceleration of the particle at time t = 3.0 s is given by the second derivative of the position with respect to time:
a = [tex]d^{2} \frac{x}{dt^{2} } = 2c[/tex]
Since the acceleration is in the negative direction of the x-axis, the value of c must be negative.
Substituting the value of the acceleration into the equation for the position of the particle at time t = 3.0 s gives:
x = 3.0 m + 12.0 m - 54 m/s³ + 9c
= 3.0 m + 12.0 m - 54 m/s³ - 9(-a/2)
= 3.0 m + 12.0 m - 54 m/s³ + 9a/2
= 3.0 m + 12.0 m - 54 m/s³ + 9(-36 N)/2
= 3.0 m + 12.0 m - 54 m/s³ - 162 N
= -147 m - 54 m/s³
Since the position of the particle at time t = 3.0 s is given as -147 m, the value of c must be:
c = (-147 m - 54 m/s³) / (9 s2)
= -17 m/s²
Therefore, the value of the constant c is -17 m/s².
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See full question below
A 2.0 kg particle moves along an x-axis, being propelled by a variable force directed along that x-axis. Its position is given by x = 3.0 m + (4.0 m/s)t + ct2 - (2.0 m/s3)t3, with x in meters and t in seconds. The factor c is a constant. At t = 3.0 s, the force on the particle has a magnitude of 36 N and is in the negative direction of the axis. What is c?
8. Consider the following equation: IQ (MA/CA) X 100. What does the MA stand for?
m-factor
mental age
male factor
multiple factor
Answer:
In the equation IQ (MA/CA) X 100, the MA stands for mental age. Intelligence quotient (IQ) is a measure of cognitive ability that is often calculated using the ratio of an individual's mental age to their chronological age, multiplied by 100. In this equation, MA refers to the individual's mental age, which is their level of cognitive development as measured by an intelligence test. CA refers to their chronological age, which is their actual age in years. The ratio of these two values is used to calculate their IQ score.
In machines with low efficiency, most of the lost energy is turned into?
a. Light
b. Sound
c. Power
d. Heat
Answer:
Option (C)
Explanation:
All electric machines are not ideal, therefore they have some losses due to which efficiency being less than 100%.
the vertical and horizontal distance of the projectile will be equal if the angel of the progectile is
Answer: The vertical and horizontal distance of a projectile will be equal if the angle of projection is 45 degrees.
Explanation:
This is because at an angle of 45 degrees, the projectile will be equally influenced by the horizontal and vertical components of its motion. As a result, the projectile will travel the same distance horizontally as it does vertically.
For other angles of projection, the projectile will be more influenced by either the horizontal or the vertical component of its motion, depending on the angle. At an angle of 90 degrees (straight up), the projectile will be primarily influenced by the vertical component of its motion, while at an angle of 0 degrees (horizontal), the projectile will be primarily influenced by the horizontal component of its motion.
A plumb bob (a mass m hanging on a string) is deflected from the vertical by an angle θdue to a massive mountain.A) Make an estimate of the mass of Mt. Everest, assuming it has the shape of a cone 3910m high and base of diameter 3910m Assume its mass per unit volume is3000kg/m3.B)Estimate the angle of the plumb bob if it is 5.20km rom the center of Mt. Everest.
a)An estimate of the mass of Mt. Everest is 4.7 × [tex]10^{13}[/tex] kg.
b) The angle of the plumb bob is - 6.83 ×[tex]10^{-4}[/tex] degree.
Given data
h = the height of the cone = 3910m
[tex]d_{1}[/tex]= the base diameter = 3910m
ρ = the mass per unit volume = 3000kg
d=the distance of the plumb bob from the center of Mt. Everest
= 5.2km = 5200m
[tex]R_{earth}[/tex] = earth's radius = 6400000m
[tex]M_{earth}[/tex] = earth's mass = 5.97 ×[tex]10^{24}[/tex] kg
A) Mass = Volume × Density
M = [tex]\frac{1}{3} \frac{\pi }{4} d_{1} ^{2} h[/tex] × ρ
M = [tex]\frac{1}{3} \frac{\pi }{4} * (3910)^{2} * 3910 * 3000[/tex]
M = 4.7 × [tex]10^{13}[/tex] kg
Therefore, an estimate of the mass of Mt. Everest is 4.7 × [tex]10^{13}[/tex] kg.
B) The plumb bob makes some angle with the vertical because it is subjected to the gravitational force from Mt. Everest and the gravitational force of the earth in the downward direction.
calculating the sideway force from Mt. Everest:
[tex]F_{x} = \frac{GM_{bob} * M }{d^{2} }[/tex]
calculating the downward force from the center of the earth:
[tex]F_{y} = \frac{GM_{bob} * M_{earth} }{R_{earth} ^{2} }[/tex]
then,
tanθ = [tex]\frac{{GM_{bob} * M }/{d^{2} }}{{GM_{bob} * M_{earth} }/{R_{earth} ^{2} }}[/tex]
tanθ= [tex]\frac{M * R_{earth} ^{2} }{M_{earth} * d }[/tex]
tanθ = [tex]\frac{4.7 * 10^{13} * 6400000 }{5.97 * 10^{24} * 5200^{2} }[/tex]
= 1.193 × [tex]10^{-5}[/tex]
θ = 6.83 × [tex]10^{-4}[/tex] degree
So, the angle of the plumb bob is - 6.83 ×[tex]10^{-4}[/tex] degree.
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Q8 The figure 3 below shows a metallic ball passing through a ring before being heated.
(a) Describe how the particles inside the ball are moving at the start of experiment.
(b) When the ball is heated using a Bunsen burner, it no more passes through the ring. Explain, in terms of particles, why the ball does not pass through the ring after being heated.
(c) Define radiation.
The particles inside the ball are vibrating about a fixed position at the start of the experiment.
When the ball is heated using a Bunsen burner, it no more passes through the ring because the particles have increased kinetic energy, hence, they are able to vibrate across a larger space and more frequently, resulting in an increase in volume of the ball.
Radiation is a process of heat transfer that occurs through space and thus does not require an intervening material medium for heat transfer.
What are some of the effects of heat on a substance?When heat energy is added to a substance, some of the observable effects include:
an increase in temperaturean increase in volumea change of state.Heat is transferred through two main processes; conduction, convection, and radiation.
When an object is heated, the particles acquire kinetic energy and collide faster resulting in an increase in temperature as well as volume of the object.
Thisbis observed in the ball and ring experiment.
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A square meter of the axon membrane has a resistance of 0.2 ohms. The membrane is 7.5 x 10‐⁹ m thick. What is the resistivity of the membrane?
Answer:
R = p_a d/A therefore RA/d = p_a = 2.67 x 10^-7 ohm m
Explanation: