Answer:
mass
Explanation:
Mass (M) is the measure of the amount of matter in an object. Mass is measured in grams (g). Mass is measured on a balance by comparing the object against other objects with known masses.
Answer:
Mass is the amount of matter in a substance
A student is conducting an experiment that involves adding hydrochloric acid to various minerals to detect if they have carbonates in them. the student holds a mineral up and adds hydrochloric acid to it. the acid runs down the side and onto the student’s hand causing irritation and a minor burn. if they had done a risk assessment first, how would this situation be different?
If they had done a risk assessment first "The student would have no injuries because he would know hydrochloric acid is dangerous and would be wearing gloves when using it"
What is hydrochloric acid?An aqueous solution of hydrogen chloride HCl that is a strong corrosive irritating acid, is normally present in dilute form in gastric juice, and is widely used in industry and in the laboratory.
Maintain a safe distance between your hands and your body, mouth, eyes, as well as a face when utilizing lab supplies and chemicals.
If they had done a risk assessment first "The student would have no injuries because he would know hydrochloric acid is dangerous and would be wearing gloves when using it"
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Most interstellar clouds are: Most interstellar clouds are: much bigger than our solar system. similar in size to clouds in Earth's atmosphere. about the size of Earth. about the size of a wavelength of light. much smaller than the clouds in Earth's atmosphere.
Answer:
Most interstellar clouds are much bigger than our solar system.
Explanation:
An interstellar cloud refers:
It is generally an accumulation of gas, plasma, and dust in our and other galaxies. It is basically a denser-than-average region of the interstellar medium (ISM).Interstellar clouds can be large up to 106 solar masses
It is also often said to be the most massive entities in the galaxy.
Hence
we can say about Interstellar clouds,
They are much bigger than our solar system.
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Astronomers cannot use parallax to find the distance to most stars. This is because the stars are Choose one: A. too small. B. too close. C. moving too fast. D. too far away.
Answer:
B
Explanation:
Astronomers cannot use parallax to find the distance to most stars. This is because the stars are: B too close.
Make a list of nutrients found in packed items and amount of nutrient present in them
EXAMPLE IS SHOWN IN PIC
If any one will answer this correctly I will mark them as brainlist
Nutrients found in packed items include carbohydrates, fats and proteins and the amount of nutrients present in them is found in calories/grams.
What are macronutrients?Macronutrients are nutrients that contain calories that must be consumed in the diet to perform metabolic functions.
These macronutrients are specified in packed foods, and include proteins, carbohydrates and lipids.
Macronutrients provide 4 calories (proteins and carbohydrates) or 9 calories per gram (fats).
In conclusion, nutrients include carbohydrates, fats (lipids) and proteins and their proportions are expressed in grams.
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Newton’s laws of motion are an inherent part of our everyday life. Starting from the beginning of the day till the end, Newton’s laws find their applications in a number of activities we do.
1st
Newton's laws of motion are three basic laws of classical mechanics that describe the relationship between the motion of an object and the forces acting on it. These laws can be paraphrased as follows: Law 1. A body remains at rest, or in motion at a constant speed in a straight line, unless acted upon by a force.
2nd
Newton's second law of motion can be formally stated as follows: The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
3rd
His third law states that for every action (force) in nature there is an equal and opposite reaction. If object A exerts a force on object B, object B also exerts an equal and opposite force on object A. In other words, forces result from interactions.
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Determine the launch speed of a horizontally launched projectile that lands 26.3m from the base of a 19.3m high cliff
The launch speed of a horizontally launched projectile is 13.28 m/s.
Time of motion of the projectile
The time of motion is calculated as follows;
t = √(2h / g)
where;
h is height of the cliffg is acceleration due to gravityt = √(2 x 19.3 / 9.8)
t = 1.98 s
Launch speed of the projectileX = Vxt
Vx = X/t
Vx = (26.3)/(1.98)
Vx = 13.28 m/s
Thus, the launch speed of a horizontally launched projectile is 13.28 m/s.
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When sound waves superimpose they can interfere?
Answer:
Explanation:
When two waves of similar frequency arrive at the same point and superimpose, they alternately constructively and destructively interfere. This alternating is known as a beat because it produces an unpleasant pulsing sound
In creating an accurate scale model of our solar system, Lana placed Earth 1 foot from the Sun. The actual distance from Earth to the Sun is 93,000,000 miles. If the actual distance from Pluto to the Sun is 3,695,950,000 miles, how far from the Sun would Lana need to place Pluto in her model
Pluto would be placed 39.74 feet far from the Sun.
Astronomers use the gap between Earth and the sun, which is ninety-three million miles, as a new unit of measure called the Astronomical Unit.
Map scale refers to the connection (or ratio) between the space on a map and the corresponding distance on the ground. For example, on a 1:one hundred thousand scale map, 1cm at the map equals 1km on the ground.
The distance between the earth and solar, a = around 150 million km, is defined as one Astronomical Unit (AU). The radius of the solar, the solar is around 700,000 km.
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A box weighing 660 N is sliding across a cement floor and the coefficient of sliding
friction between the box and the floor is 0.15. What is the frictional force?
09g
O 4,400 N
0 99 N
O 99 kg
The Frictional force is 99 N; option C.
What is the frictional force?The frictional force between the floor and the surface is calculated as follows:
Frictional force = coefficient of friction * normal reaction
Frictional force = 660 * 0.15
Frictional force = 99 N
In conclusion, the frictional force is determined from the coefficient of friction and the normal reaction of the box on the floor.
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The _________ system produces electrical power while the engine is running to operate all the electrical components and recharge the battery
Answer:
kinetic energy and potential and electrical energy
Explanation:
it will be need to maintain the motion of the vehicle and produce electrical energy
What type of resistance training equipment has a fixed range of motion? Chains Resistance bands Free weights Weight machines
Chains are the type of resistance training equipment which has a fixed range of motion.
What is Resistance?This is a type of force which restricts the motion of an object thereby slowering it down.
Chains help to build stamina and power though varying the loads in a fixed range of motion. This is why it was chosen as the most appropriate choice.
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The deflection angle of the laser beam as it exits the prism is 22. 6º. If the prism had been made of glass instead of polystyrene plastic, what would the deflection angle have been?.
A bar is 20 cm long. a 100 g mass is placed on one end and a 150 g mass on the other. where is the balance point of the bar.
The balance point of the bar from the 100 g mass is 12 cm.
Balanced point of the barApply principle of moment as follows;
Let the balance point from 100 g mass = x
Clockwise moment = anti clockwise moment
100x = 150(20 - x)
100x = 3,000 - 150x
250x = 3000
x = 3000/250
x = 12 cm
Thus, the balance point of the bar from the 100 g mass is 12 cm.
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do banked curves help car make turns more softly
Answer:
yes
Explanation:
banked curve :
is a road that looks like the top part of a race track
its looks elevated
often seen in bicycle race track (velodrome)
Banking the curve can help keep cars from skidding. When the curve is banked, the centripetal force can be supplied by the horizontal component of the normal force.
sfuca
What is the current in a 10 ohm resistor ?
Answer:
c option 22.0A
Explanation:
V=IR
I=R/V
Which of the following statements are true about a mass rotating around a string? Select all that apply.
Group of answer choices
A. If you cut the string as the ball is in motion, the ball will continue to move in uniform circular motion due to the centripetal force.
b. The acceleration and velocity vectors on the mass will always be perpendicular to each other.
c. Since the linear speed of the rotating mass is constant, the kinetic energy of the mass is also constant.
d. The acceleration and centripetal force vectors will always be directed inward, towards the center of the arc.
Answer:
Only (C) and (D) are true
a = (v2 - v1) / t since a and v are vector quantities they have the same direction
Also KE = 1/2 M v^2 describes the linear KE of an object moving with a speed of v
Also KE = F * S where S is the displacement - the radius vector is a constant for an object moving in a circle and the centripetal force provides no change in KE
An eagle that has a mass of 4.5 kg is spotted 5 m above a lake. it flies up to its nest in a tree at a height of 25 m. how much gravitational potential energy did the eagle gain? 221 j 882 j 1103 j 1323 j
882J of gravitational potential energy is gained by the eagle.
Here, we have been provided with data-
mass, m = 4.5 kg
height, h = 25 m
We have to find the gravitational potential energy.
In the question, it is given that the eagle is at a height of 5m and it flies from there 20 m more to reach its nest.
So, gravitational potential energy is given as
P.E = m x g x h
P.E = 4.5 × 9.8 × 20
P.E = 882J
Thus, the correct option is (b).
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Answer:
b
Explanation:
its b
A constant 20N force is applied to a 7kg box to push it along the ground. How much work is done by this force if the box moves 2m?
Answer:
40 J
Explanation:
W = (f)(d)
W = (20)(2)
W = 40 J
If a constant 20 N force is applied to a 7 kg box to push it along the ground , then the work is done by this force if the box moves 2 meters would be 40 Newton meters.
What is work done?The total amount of energy transferred when a force is applied to move an object through some distance .
As given in the problem if a constant 20 N force is applied to a 7 kg box to push it along the ground, then we have to find out the work is done by this force if the box moves 2 meters ,
The work done by the force to push the box = 20 × 2
=40 Newton meters
Thus, the work is done by this force if the box moves 2 meters would be 40 Newton meters.
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Some of the lowest pitches attainable on a musical instrument are achieved on the world's largest pipe organs. What is the length of an organ pipe that is open on both ends and has a fundamental frequency of 8.75 Hz when the speed of sound in air is 341 m/s
The length of an organ pipe is 19.48
Given,
An organ pipe that is open on both ends and has a fundamental frequency of n1 = 8.75Hz & the speed of sound in air is v = 341m/s
we have the formula for fundamental frequency in open pipe as
n1 = v /λ1 = v / 2L
so L = v / 2n1
plug in the values for L
n1 = v / λ1 = v / 2L
L = v / 2n1
= 341 / 2 (8.75)
= 19.48
The length of an organ pipe is 19.48
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i dont understand pojectile motion can someone help with this
When thrown from the balloon, the sandbag has a constant horizontal/forward velocity. As the text puts it, "the sandbag continues forward as if it had not been dropped." What this means is that the sandbag has no acceleration in the horizontal plane of motion, so it moves in this direction at a constant speed. So for any time [tex]t[/tex], the horizontal velocity is given by
[tex]v_x(t) = 12\dfrac{\rm m}{\rm s}[/tex]
In the vertical plane of motion, the sandbag has no vertical velocity until it's released and allowed to fall. As it's falling, however, the sandbag is being pulled down by gravity and is accelerating with magnitude [tex]g=9.8\frac{\rm m}{\mathrm s^2}[/tex], so its vertical/downward velocity at time [tex]t[/tex] is given by
[tex]v_y(t) = -gt[/tex]
So, after 3 seconds have passed, the sandbag has horizontal velocity [tex]v_x = 12\frac{\rm m}{\rm s}[/tex] and vertical velocity [tex]v_y = -g(3\,\mathrm s) = -29.4\frac{\rm m}{\rm s}[/tex]. If the question is specifically asking about speed you would just ignore the negative signs.
In a certain material there is a current of 18 A flowing through a surface to the right, and there is an equal amount of positive and negative charge passing through the surface producing the current. How much negative charge passes through the surface
The negative charge passes through the surface is 9 A/s
The Intrinsic property of protons and electrons are known as Electric Charge
Protons are known as positive charge
Electrons are known as negative charge
Give that
I =18A
The current is flowing to the right
The equal amount of positive and negative charges.
that is total charge is q= Q+Q=2Q. that is magnitude
Then, the rate of charge that pass though is dq/dt
Give that,
q=it
2Q=it
Let differentiate with respect to t
2dQ/dt=I
Then, dQ/dt=i/2
Since I=18A
Then, dQ/dt=18/2
dQ/dt= 9 A/s. Toward the left
9 A/s negative charge passes through the surface .
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A dipole with its charges,-q and +q located at the points (0,-b,0) and (0+b,0) is present in uniform electric field E whose equipotential surfaces are planes parallel to the YZ planes.
The direction of the electric field based on the information given about the dipole is along the x axis.
What is a dipole?It should be noted that a dipole simply means a pair of opposite charges that are separated by a distance.
By default, the direction of the dipole is always from the negative charge -q to the positive charge q.
In this case, since the equipotential surfaces are planes parallel to the YZ planes., the direction of the electric field is along the x axis.
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Complete question:
A dipole with its charges,-q and +q located at the points (0,-b,0) and (0+b,0) is present in uniform electric field E whose equipotential surfaces are planes parallel to the YZ planes.
What is the direction of the electric field?
10) What is the total energy of a 450-g mass that is attached to a horizontal spring with a force constant of 260 N/m and oscillates along a frictionless horizontal surface with amplitude of 8.0 cm
Answer:
E = 1/2 * k x^2 is the energy stored in the spring
E = 1/2 * 260 N/m * .08^2 m = .832 Joules
A 10 N force and a 15 N force are acting from a single point in opposite directions. What additional force must be added to produce equilibrium?
Group of answer choices
A) A 5 N force acting in the same direction as the 10 N force.
B) A 10 N force acting in the same direction as the 15 N force.
C) A 25 N force acting in the direction perpendicular to the 10 N and 15 N forces.
D) A 5 N force acting in the same direction as the 15 N force.
The additional force must be added to produce equilibrium is 5 N force acting in the same direction as the 10 N force (Option A)
Data obtained from the questionForce to the left = 10 NForce to the right = 15 NAdditional force =?How to determine the additional forceTo have equilibrium,
Force to the left = force to the right
But
The force to the right is greater than the force to the left.
Thus,
Force to the left + additional force = force to the right
10 + additional force = 15 N
Collect like terms
Additional force = 15 - 10
Additional force = 5 N
Therefore, an additional force of 5 N acting in the same direction of the 10 N force is needed to obtain the equilibrium of the system (Option A)
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A diagnostic test involving recording the electrical activity within muscle fibers in response to nerve stimulation is known as.
Electromyography (EMG) measures muscle response or electrical activity in response to a nerve's stimulation of the muscle. The test is used to help detect neuromuscular abnormalities.
Electromyography (EMG) :
(EMG) detects the electrical activity that occurs when a muscle is stimulated by a nerve. The test is used to identify aberrant neuromuscular function. One or more tiny needles, commonly known as electrodes, are introduced through the skin and into the muscle during the test. An oscilloscope is then used to display the electrical activity that the electrodes picked up (a monitor that displays electrical activity in the form of waves). In order to hear the activity, an audio amplifier is employed. The electrical activity of muscles during rest, a light contraction, and a strong contraction is measured by EMG. At rest, muscle tissue doesn't typically create any electrical signals. A brief period of activity can be seen on the oscilloscope when an electrode is introduced, but there should be no signal beyond that.
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What is the velocity ratio of the inclined plane h 9 L 12 hypothesis 15 bellow? A. 1.25 B. 0.60 C. 1.67 D. 0.80
B is the answer
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The density of a block of wood is 2.7 g/cm³ and a mass of 583.3 g. What is its volume?
A lump of butter has a volume of 350 cm³ and a mass of 319 g. What is the density of the butter?
Answer:
1) To find the volume of the wood block, divide the mass by the density:
Volume = 583.3 g / 2.7 g/cm³
Volume = 216.24 cm³
2) To find the density of the butter, divide the mass by the volume:
Density = 319 g / 350 cm³
Density = 0.9114 g/cm³
Explanation:
Only 25% of the intensity of a polarized light wave passes through a polarizing filter. What is the angle between the electric field and the axis of the filter
Answer: Only 25% of the intensity of a polarized light wave passes through a polarizing filter. Then the angle between the electric field and the axis of the filter will be 60 degrees.
Explanation: To find the answer of the problem given, we have to know about the Malu's law of polarization.
What is Malu's law of polarization?This law states that, when a beam of completely polarized light is passed through an analyzer, then then intensity I of the transmitted light varies directly as the square of the angle [tex]\alpha[/tex] between the transmission direction of the polarizer and the analyzer.The expression for this law will be,[tex]I=I_0cos\alpha[/tex]
Where, I₀ is the maximum intensity of the transmitted light through the polarizer.How to solve the problem?From the question, it is clear that, the 25% of the intensity of a polarized light wave passes through the filter.[tex]\frac{I}{I_0} =0.25\\[/tex]
Thus, the angle between electric field and the axis of the filter is,[tex]cos^2\alpha =0.25\\cos\alpha =\sqrt{0.25} =0.5\\\alpha =cos^-1(0.5)=60 degrees[/tex]
Thus, we can conclude that, the angle between the electric field and the axis of the filter will be 60 degrees.
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A 12.5 g clothesline is stretched with a tension of 22.1 n between two poles 7.66 m apart. the frequency of the fundamental and the second harmonic are 7.60 hz and 15.2 hz respectively.
(a) Fundamental frequency of clothesline is 6.98Hz.
(b) Frequency of second harmonic is 13.98Hz.
The wave velocity expression is,
v = √T / √μ
here, T is tension μ is mass per unit length
v = √22.1 / √(12.5×10⁻³/7.66)
v = 116.37 m/s
For the fundamental frequency,
v = fλ
116.37 m/s= 7.6 ×λ
λ = 15.31 m
For the second Harmonic,
λ₂= v/ f₂ = 116.37 / 15.2 = 7.66 m
Now consider mass is increased
μ= 14.8 × 10⁻³ / 7.66
v = √T / √μ
v = √22.1 / √14.80 × 10⁻³/7.66
v = 106.95 m/s
Fundamental harmonic,
f₁ = v/λ₁ = 106.95 / 15.31 = 6.98 Hz
f₂= v/ λ₂ = 106.95 / 7.65 = 13.98 Hz
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[Your question is incomplete, but most probably your full question was-
a) What is the frequency of the fundamental harmonic for a clothesline with a mass of 14.8 g?
(b) What is the frequency of the second harmonic for a clothesline with a mass of 14.8 g?]
Tommy is awake during a procedure involving his brain his doctor has a test and electrical part of his brain and stimulating it every time she does so tommy start singing showtunes what is the procedure an example of
Repetitive Transcranial Magnetic Stimulation (TMS) is the procedure that is being performed on Tommy, while he is awake.
What is Transcranial Magnetic Stimulation?
Transcranial magnetic stimulation (TMS) is a non-invasive method for mood control. It does not require the patient to be sedated and is usually performed on completely conscious patients.
In this procedure, the nerve cells are stimulated by magnetic pulses by placing electromagnetic coils against the scalp of the patient. The patient is then stimulated repetitively which is why it is known as repetitive TMS.Tommy sings during the procedure because the region of the brain responsible for memory and singing is stimulated by this procedure.
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