A 5 kg box is sliding across a level floor. The box is acted upon by a force of 27 newtons east and a frictional force of 17 newtons west. What is the magnitude of the acceleration of the box? Type only numbers. Do not include the units of m/s2.
Answers
Answer:
The acceleration of the box is 2.
Explanation:
According to Newton's second law of motion, the acceleration of any object will be directly proportional to the net unbalanced force acting on the object and inversely proportional to the mass of the object.
Net force = Mass × Acceleration
So
Since in this case, the box is experiencing a force from east of magnitude 27 N and resisting force of about 17 N from west. So the net force will be the difference of acting and reacting force.
Net force = 27-17 = 10 N.
Thus,
So 2 is the acceleration of the box. Thus the magnitude of acceleration of the box is 2.
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Answers
1/425 = 2.353ms
Answers
Answer:
Yes it does
Explanation:
Gravity is pushing down on the pencil but the coffee mug is also pushing the pencil up with the same amount of force so they both don't move
(2)higher speed
(3)longer period
(4)higher frequency
Answers
Answer: The correct answer is higher frequency.
Explanation:
Doppler's effect is defined as the apparent change in the frequency of an electromagnetic wave due to the relative motion of an observer and source.
In the given problem, a stationary police officer directs radio waves emitted by a radar gun at a vehicle moving toward the officer. In this case, there will be higher frequency.
If a stationary police officer directs radio waves emitted by a radar gun at a vehicle moving away the officer. In this case, there will be smaller frequency but will have a longer wavelength.
Therefore, the radio waves reflected from the vehicle and received by the radar gun have a higher frequency.
The emitted radio waves, the radio waves reflected from the vehicle and received by the radar gun have a higher wavelength.
What is the Doppler effect?
A sudden change in the frequency due to the distance between the objects and source is explained by the doppler effect.
As the source and observer travel toward each other, the frequency of sound, light, or other waves increases or decreases.
The emitted radio waves, the radio waves reflected from the vehicle and received by the radar gun have a higher wavelength.
Hence option 4 is correct.
To learn more about the doppler effect refer to the link;
Answers
Answers
Answer:
the velocity of a moving body relative to another body is called relative velocity.
300 J
400 J
1000 J
Answers
Answer:
The K.E of the pendulum is, K.E = 200 J
Explanation:
Given data,
The kinetic energy of the bob of the pendulum at the bottom, K.E = 600 J
The potential energy at the height 4 m, P.E = 400 J
According to the conservation of energy, the total energy of the mechanical system should be conserved.
At the bottom of the swing, the entire mechanical energy of the pendulum is purely kinetic. Therefore the total energy
E = P.E + K.E
= 0 + 600 J
= 600 J
Therefore, the total energy of the system, E = 600 J
At height 4 m, the total energy of the system remains the same.
Therefore,
600 J = 400 J + K.E
K. E = 600 J - 400 J
= 200 J
Hence, the K.E of the pendulum is, K.E = 200 J