If the net force acting on a moving object causes no change in its velocity, the object's momentum will stay the same.
What is momentum?Momentum of a body in motion refers to the tendency of a body to maintain its inertial motion.
The momentum is the product of its mass and velocity.
This suggests that if the net force acting on a moving object causes no change in its velocity, the momentum of the object will remain the same.
Therefore, if the net force acting on a moving object causes no change in its velocity, the object's momentum will stay the same.
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A ball thrown vertically upwards from ground
level hits the ground after 4 s. Calculate the
maximum height it reached during its journey.
(SC/GCE)
parabolic motion
[tex]\tt t_{max}=\dfrac{2u~sin~\alpha }{g}[/tex]
[tex]\tt h_{max}=\dfrac{u^2sin^2\alpha }{2g}[/tex]
vertically upwards ⇒ α = 90°⇒sin 90° = 1
[tex]\tt 4=\dfrac{2u}{10}\rightarrow u=20~m/s[/tex]
[tex]\tt h_{max}=\dfrac{20^2}{2.10}=\boxed{\bold{20~m}}[/tex]
In case of a Crash the pilot of the plane jumped from it and opened his parachute after falling through 40m
Answer: 20m
Explanation: because half 40 is 20
Answer:
20m
Explanation: because half 40 is 20
A jambo jet mass 4×10^2 kg travelling at a speed pf 5000 m/s lands on the airport . It takes 2 min to come to rest .calculate the average force applied by the groind on the aeroplane
The average force applied by the ground on the Aeroplane is 16.664 kN.
What is Newton's second law of motion?It states that the force F is directly proportional to the acceleration a of the body and its mass.
F =ma
Given is the mass of aeroplane, m =400 kg and the velocity v = 5000 m/s,
It takes t = 2 min to come to rest, then the acceleration will be
a = velocity /time
a = 5000/(2x60)
a = 41.66 m/s²
According to the Newton's second law of motion.
F = 400 kg x 41.66 m/s²
F = 16.664 kN
Thus, the average force applied by ground on aeroplane is 16.664 kN
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The F-35B Lightning II is a short-takeoff and vertical landing fighter jet. If it does a vertical takeoff to 20.00-m height above the ground and then follows a flight path angled at 26o with respect to the ground for 25 km, what is the final displacement in meters
The final displacement of the F-35B Lightning fighter jet is determined as 24,991.2 m.
Displacement of the flight
The displacement of the flight is calculated from triangle method of vector addition as follows;
Let the vertical take off = first length of triangleLet the flight path at 26⁰ = second length of triangleLet the displacement = third side of triangleAngle between the first two sides = 90 - 26⁰ = 64⁰
r² = a² + b² - 2abcosR
r² = 20² + 25000² - (2 x 20 x 25000) x cos(64)
r² = 624,562,028.9
r = 24,991.2 m
Thus, the final displacement of the F-35B Lightning fighter jet is determined as 24,991.2 m.
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25. a small container of water is placed on a turntable inside a microwave oven, at a radius of 12.0 cm from the center. the turntable rotates steadily, turning one revolution in each 7.25 s. what angle does the water surface make with the horizontal?
The angle that the water surface make with the horizontal is 0.527°.
How to calculate the angles?The water vapor moves at speed. Therefore,
v = 2πr/T = (2 × π × 0.120)/7.25
= 0.104m/s
Also, the top layer of water deals a downward force if gravity which will be:
= mv²/r = 0.104/0.12 = 0.0901
There, the angle will be:
= tan(0.0901/9.8)
= 0.527°
In this case, the angle that the water surface make with the horizontal is 0.527°.
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Calculating the volume of an irregular solid
Answer:
final volume - original volume
Answer:
See below
Explanation:
Place the solid in a graduated cylinder filled with water ( or other non-reactant liquid) and measure the change in volume in the graduated cylinder
An object whose mass is 0.092 kg is initially at rest and then attains a speed of 75.0 m/s in 0.028 s. What average net force acted on the object during this time interval?
Answer:
F = 246.4 N
Explanation:
Concepts:Newton's Laws Of MotionFirst Law: (Law of Inertia)
Inertia refers to the tendency of an object to resist any change in its state of motion. Inertia is a measure of the objects mass.Second Law:
refers to an object's motion when a net force does not equal zero. Acceleration is directly proportional to the net force and inversely proportional to the object's mass.Third Law: (Action - Reaction)
Whenever one object exerts a force on a second object, the second objects exert an equal but opposite force on the first.Weight:
Force of gravity is the weight of an object and is measured in Newtons.Friction:
Frictional forces always oppose motion. The frictional forces ([tex]F_f[/tex]) is proportional to the coefficient of friction (Ц) and to the normal force [tex](F_n) F_f=uF_n[/tex].The normal force is a contact force which acts perpendicular to the common surface of contact.Now onto the steps:
----------------------------------
F = mΔV ÷ t
F = 0.093 x 75 ÷ 0.028
F = 246.4 N
Therefore, the average net force acted on the object during this time interval is 246.6 Newtons.
A boy is swinging a yo-yo with mass 0.5 kg in a circle with radius 0.7 m at a
speed of 7 m/s. what is the tension in the string connecting the yo-yo to the
boy's finger, disregarding the effect of gravity?
a. 35 n
b. 20 n
c. 9 n
d. 12 n
Based on the calculations, the tension in the string connecting the yo-yo to the boy's finger is equal to: A. 35 Newton.
Given the following data:
Mass, m = 0.5 kg.Speed, v = 7 m/s.Radius, r = 0.7 meters.How to calculate the tension in this string?Based on the information provided, we can logically deduce that the tension in the string connecting the yo-yo to the boy's finger is equal to the centripetal force acting on it.
Mathematically, centripetal force can be calculated by using this formula:
Fc = mv²/r
Fc = (0.5 × 7²)/0.7
Fc = 24.5/0.7
Fc = 35 Newton.
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Nina and ryan each ran at a constant speed for a 100-meter race. Each runner’s distance for the same section of the race is displayed on the left. Who had a head start, and how big was the head start?.
"Nina and Ryan each ran at a constant speed for a 100-meter race. Each runner’s distance for the same section of the race is displayed on the left." In the event of things, Ryan had a headstart of 10min. This is further explained below.
What is headstart?Generally, headstart is simply defined as a head start is a benefit received or awarded from the outset.
In conclusion, "When racing 100 meters, both Nina and Ryan maintained a steady pace. On the left is a chart showing the distance covered by each runner during the same segment of the race." Whatever the case may be, Ryan was given a 10-minute head start.
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Answer: Ryan had a head start of 10 meters.
Explanation: Trust me
describe one example of how a person's religious faith associated with a world religion can be seen in an incident from their life.
Answer:
The Crusades, the many periods of persecution of Jews, religious conflicts between Catholics and Protestants in sixteenth- and seventeenth-century Europe, the execution of hundreds of Christians in seventeenth-century Japan, the Mormon expulsion from Missouri and Illinois in the 1840s, the Branch Davidian conflagration
How does the amount of energy needed to melt 1 kg of ice at 0°C compare to the
amount of energy needed to change 1 kg of water to steam at 100°C? Base your
answer on the heat of fusion of water and the heat of vaporization of water.
(A) It takes about two-thirds as much energy to boil the water as to melt the ice.
(B) It takes the same amount of energy to boil the water and melt the ice.
(C) It takes about two-thirds as much energy to melt the ice as to boil the water.
(D) It takes more than six times as much energy to boil the water as to melt the
ice.
(A) It takes about two-thirds as much energy to boil the water as to melt the ice.
Which word is described by this statement? This is the top of the volcano where sulfur-filled gasses and lava come out.
Answer:
I believe it is crater.
According to Newton's 2nd Law of Motion, if the mass of an object is 10 kg and the force is 10 newtons, then the acceleration is
10 m/s/s
10 m/s
100 m/s/s
1 m/s/s
According to Newton's second Law of motion, if the mass of an object is 10 kg and the force is 10 newtons, then the acceleration is 1m/s².
How to calculate acceleration?The acceleration of a moving body can be calculated by dividing the force of the body by its mass.
According to this question, the mass of an object is 10 kg and the force is 10 newtons, then the acceleration can be calculated as follows:
acceleration = 10N ÷ 10kg
acceleration = 1m/s²
Therefore, according to Newton's second Law of motion, if the mass of an object is 10 kg and the force is 10 newtons, then the acceleration is 1m/s².
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A mass is stretched 4 centimeters from the equilibrium position of a spring. if the displacement is doubled, what can be concluded about the restoring force? a. it is halved. b. it is doubled. c. it stays the same. d. it is increased by 4. e. it is decreased by 1 4
From a spring's equilibrium point, a mass is stretched by 4 cm. The restoring force will also double if the displacement doubles. Option B is correct.
What is spring force?The force required to extend or compress a spring by some distance scales linearly with respect to that distance is known as the spring force. Its formula is;
F = kx
The given data in the problem is;
F is the spring force =?
K is the spring constant= 8.5 N/m
x is the length by which spring got stretched = 1.2m
Given condition:
Displacement is doubled(x'=2x)
The spring force is directly propotional to the displacement of the spring;
F ∝ x
F' ∝ x'
If the displacement is doubled, the spring force will also double.
Hence option B is correct.
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Answer: From a spring's equilibrium point, a mass is stretched by 4 cm. The restoring force will also double if the displacement doubles. Option B is correct.
What is spring force?
The force required to extend or compress a spring by some distance scales linearly with respect to that distance is known as the spring force. Its formula is;
F = kx
The given data in the problem is;
F is the spring force =?
K is the spring constant= 8.5 N/m
x is the length by which spring got stretched = 1.2m
Given condition:
Displacement is doubled(x'=2x)
The spring force is directly propotional to the displacement of the spring;
F ∝ x
F' ∝ x'
If the displacement is doubled, the spring force will also double.
Hence option B is correct.
Explanation:
PLS HELP: How do you think the mass media present mental disorders? Do you think the portrayals are accurate or inaccurate? Why?
The mass media present mental disorders by the daily soap programs and movies.
What is mass media?Mass media is the means of communication that reach large numbers of people in a few seconds through optical fiber transmission cables connection, such as television, newspapers, magazines, and radio.
Studies show that both entertainment and news media provide dramatic and distorted images of mental disorders. It can lead to more dangerous personality to develop in people including fear, rejection, derision and ridicule. The criminal activity has received heavy coverage in the mass media.
Thus, the mass media present mental disorders by the daily soap programs and movies.
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At time t=0 , in your frame of reference Z, you measure the back of the spaceship to be at x=0 and the front of the ship to be at x=l . Find an equation relating the length that you measure l to the ship's proper length l0 .
An equation relating the length that you measure l to the ship's proper length l0 is
l =l0/y. This is further explained below.
What is an equation relating the length that you measure l to the ship's proper length l0?Generally, Any object's length in a moving frame will look shortened or contracted when seen in that direction. The Lorentz transformation may be used to determine the amount of contraction.
In conclusion, To use the Lorentz Lorentz transformation, the length Lo-x2 - may be determined if it is measured in the moving reference frame. Hence the Resultant l = l0/y.
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How to convert work done in joules into kilojoules?
1 Kilojoule [kJ] = 737.562 149 277 27 Foot pound force [ftlbf]
Answer:
divide by 1000
Explanation:
eg 1kJ is equal to 1000J
Why is it not possible to achieve a higher resolution in the light microscope?.
Explanation:
Because resolution of the light microscope cannot be small than the half of the wavelength of the visible light
Which labels belong in the regions marked X, Y, and Z?
OX: Smaller nuclei form
Y: Thermal energy is produced
Z: A larger nucleus forms
OX: Large amounts of energy are released
Y: One or more neutrons is released
Z: Smaller nuclei form
OX: One or more neutrons is released
Y: A larger nucleus forms
Z: Large amounts of energy are released
OX: A larger nucleus forms
Y: Large amounts of energy are released
Z: Smaller nuclei form
The following depict the letters X, Y and Z
X: A larger nucleus formsY: Large amounts of energy are releasedZ: Smaller nuclei formWhat is fusion and fission?Fusion refers to a situation in which two light nuclei come together to form a heavier nucleus. Fission refers to the disintegration of a nucleus by the bombardment of a particle.
The portions that show the letters marked X, Y and Z are;
X: A larger nucleus formsY: Large amounts of energy are releasedZ: Smaller nuclei formMissing parts:
Roberto makes a graphic organizer to compare fusion nuclear reactions and fission nuclear reactions. A venn diagram with 2 intersecting circles The circle on the left is labeled fusion. The circle on the right is labeled fission. There is a Z in the fission circle. There is an Y in the intersecting area. There is an X in the fusion circle. Which labels belong in the regions marked X, Y, and Z?
OX: Smaller nuclei form
Y: Thermal energy is produced
Z: A larger nucleus forms
OX: Large amounts of energy are released
Y: One or more neutrons is released
Z: Smaller nuclei form
OX: One or more neutrons is released
Y: A larger nucleus forms
Z: Large amounts of energy are released
OX: A larger nucleus forms
Y: Large amounts of energy are released
Z: Smaller nuclei form
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Answer: D
Explanation: I just took the exam review in edge 2022 and got it right
what makes science an exact science
Explanation:
accurate quantitative expression, precise predictions and/or rigorous methods of testing hypotheses involving quantifiable predictions and measurements.
Answer:
because it is capable of accurate quantitative expression, meaning they show an absolute precision in their results.
A conducting sphere with radius R carries total charge Q. What is the magnitude of the electric field at distances R/2 and 2R from the center of the sphere
Hello!
Distance of R/2:
Since a conducting sphere is referenced in this situation, all of its charge will be distributed along its SURFACE. Therefore, there is NO enclosed at a distance of R/2 from the center.
Using Gauss's Law:
[tex]\oint E \cdot dA = E\cdot A = \frac{Q_{encl}}{\epsilon_0}[/tex]
E = Electric field strength (N/C)
A = Area of Gaussian surface (m²)
Q = Enclosed charge (C)
ε₀ = Permittivity of free space C²/Nm²)
If the enclosed charge is 0, then:
[tex]E \cdot A = \frac{0}{\epsilon_0}\\\\\boxed{E = 0 \frac{N}{C}}[/tex]
Distance of '2R':
We can once again use Gauss's Law to solve. This time, however, a surface of radius '2R' encloses ALL of the charge of the sphere.
[tex]E \cdot A = \frac{Q_{encl}}{\epsilon_0}[/tex]
'A' is equivalent to the surface area of a sphere of radius '2R', or:
[tex]A = 4\pi (2R)^2\\\\A = 4\pi (4R^2)\\\\A = 16\pi R^2[/tex]
Substituting this expression back into Gauss's Law:
[tex]E \cdot 16\pi R^2 = \frac{Q}{\epsilon_0}\\\\E = \frac{Q}{16\pi R^2\epsilon_0}[/tex]
To simplify:
[tex]E = \frac{1}{4\pi \epsilon_0 } * \frac{Q}{4R^2}\\[/tex]
OR using k = 1/4πε₀:
[tex]\boxed{E = \frac{kQ}{4R^2}}[/tex]
A light pointer is stuck to the rubber sheet so that it pivots about a point P near the
rim of the glass, as shown (enlarged) below.
This arrangement acts as a simple thermometer.
State two disadvantages of such a thermometer.
PLEASE HELP ASAP!!
The invention and use of the microscope showed scientists that germs could cause illness. Although there had been various understandings before for why people become ill, the discovery that microscopic germs can make people sick completely changed scientific understanding of why diseases exist and spread.
This change is an example of what?
how a law changes when new evidence disproves it
how a law stays the same as new scientific inquiries are made
how a theory changes as new areas of science open up
how a theory stays the same when new research confirms it
According to the information in the fragment, it can be inferred that it is an example of how scientific development has consequences on pre-established theories and new areas are created in science (option C)
What is a scientific theory?A scientific theory is a term to refer to a set of concepts and observations that are proposed as principles to explain a class of phenomena.
According to the above, the discovery of germs and their relationship with human diseases was an event that changed scientific theories about human diseases because it demonstrated a different explanation than what was believed up to that time.
So, the correct answer is option C because this event changed scientific theory and opened new fields for scientific study and research.
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Answer:
Explanation:
According to the information in the fragment, it can be inferred that it is an example of how scientific development has consequences on pre-established theories and new areas are created in science (option C)
What is a scientific theory?
A scientific theory is a term to refer to a set of concepts and observations that are proposed as principles to explain a class of phenomena.
According to the above, the discovery of germs and their relationship with human diseases was an event that changed scientific theories about human diseases because it demonstrated a different explanation than what was believed up to that time.
So, the correct answer is option C because this event changed scientific theory and opened new fields for scientific study and research.
if water completely boils in 7 minutes, how long does it take to evaporate
Answer: 20 minutes
Explanation: omm its 20 minutes
A 84-kg man stands on a bathroom scale inside an elevator. the scale measures in units of newtons. (a) the elevator accelerates upward from rest at a rate of 1.20 m/s2 for 1.50 s. what does the scale read during this 1.50 s interval
Answer:
94 kg
Explanation:
The mass registered by the scale is based on the assumption that the force applied is due entirely to gravity. If the force is greater, then the indicated mass will be greater.
__
how many g'sAs a fraction of the acceleration of gravity, the elevator's acceleration is ...
(1.2 m/s²)/(9.8 m/s²) ≈ 6/49
net forceThe force required to produce a given acceleration is found by the formula ...
F = ma . . . . . . . force on mass m to produce acceleration 'a'
When the man is stationary on the scale, the upward force it supplies is balanced by the downward force on the man due to gravity. The force and the mass are proportional, and the constant of proportionality (the acceleration due to gravity) is used to calibrate the scale. More force is thus translated to a higher mass reading.
Since the man's net acceleration is upward at the rate of 6/49×g, the total force applied by the scale is (1 +6/49) = 55/49 times as great as when the man is stationary. This greater force gets translated to a greater mass reading.
The force is equivalent to what would be required to support a stationary man with a mass of ...
(84 kg)(55/49) = 94 2/7 kg
The scale would read about 94 kg during the upward acceleration period.
What stands in for a "creator" in scientists view of the universe?
*
1 point
The laws of physics
The "Big Bang"
String Theory
Humans create the universe
In scientists view of the universe The creator is replace by: (B). The "Big Bang"
Meaning of Big Bang
The Big bang is a theory propagated by scientist and astronomers to replace the creator.
The Big Bang is said to be a reason for the universe and all the planets in it. Scientist say the universe started as just a single point with very high temperature and density, and then here comes the big bang.
In conclusion, In scientists view of the universe The creator is replace by: The "Big Bang"
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The force on the wire is directed?
Answer: A
Explanation:
Calculate the energy used by a radio of power 30W in 1 minute.
Answer:
1800 j or 1.8 kj
Explanation:
Energy used = power (measured in watts) multiplied by time (measured by seconds)
1 minute is 60 seconds
30 multiplied by 60 is 1800
Answer:
1800 joule
Explanation:
Power (P) = 30W
Time (T) = 1 min =60 sec
P =(W/T)
30 = W / 60
W = 1800 joule
We know that Energy Is equivalent to Work done. So Energy used is 1800 joule.
Measuring Current as a Function of Voltage with a 20 Q Resistor
Voltage
M
Current Calculated
(A)
Current Experimental
(A)
1
5
10
20
50
Measuring Current as a Function of Resistance at 25 V
Resistance
Current Calculated
(10)
(A)
10
20
100
200
Determining Current in a Parallel Circuit
Observed
Resistor Set
(0)
Total
Resistance
Calculated
Current
(A)
Current
(A)
(10)
20, 20, 20
20, 20, 200
Voltage needed to raise current to 3.75 A (20, 20, 200 resistor set):
Calculated
Observed:
Calculating Power of Circuit Components
Current through Each Bulb
(A)
Table B
Table C
Table D
Observed Total Current
(A)
Current Experimental
(A)
Observed Current
through Each Resistor
(A)
Power Usage per Bulb
(
Answer:
Resistance at 25 V
Explanation:
(10)
(A)
10
20
100
200
Determining Current in a Parallel Circuit
Observed
Resistor Set
(0)
Total
Resistance
Calculated
Current
(A)
Current
(A)
(10)
20, 20, 20
20, 20, 200
Voltage needed to raise current to 3.75 A (20, 20, 200 resistor set):Calculated
Observed:
Calculating Power of Circuit Components
Current through Each Bulb
(A)
Table B
Table C
Table D
Observed Total Current
(A)
Current Experimental
(A)
Observed Current
through Each Resistor
(A)
Power Usage per Bulb
(
1. Predict whether the energy required to remove an electron from magnesium and potassium would be more or less than that required to remove an electron from sodium. Explain your prediction in terms of the forces and interactions involved in this process. \
FILL OUT THE TABLE PLEASE WITH A GOOD ANSWER FOR BRAINLIEST!
In both cases less energy is required
But comparetively Mg require more energy than K
Let's see the electron configuration of Both
[Mg]=1s²2s²2p⁶3s²=[Ne]3s²[K]=1s²2s²2p⁶3s²3p⁶4s¹=[Ar]4s¹K has only one valence electron so very less ionization enthalpy so less energy required
Mg has 2 so more IE hence more energy required