Your answer: Force
Explanation: The action from a force can cause an object to move or speed up, slow down, stop or change directions.
Answer:
a 200 feet, and trains go a whole mile even after hitting the brakes
Explanation:
Answer:
<em>Magnitude of frictional force = 30 N</em>
Explanation:
According to the second Newton's law, the net force exerted by an external agent on an object of mass m is:
Fn=m.a
The net force is the vector addition of each individual force. If the sum of all the forces acting on an object is zero, then the acceleration is zero. That means the object moves at a constant speed or is at rest.
When an object is pushed across a horizontal rough surface, there are two forces acting in the direction of the motion: The applied force and the frictional force.
If the applied force is greater than the frictional force, then the object moves at a constant positive acceleration. If the frictional force is greater than the applied force, then the object won't move at all (if it was at rest) or will start a deaccelerated motion (braking).
Finally, if both forces are equal, the object will move at a constant speed or remains at rest. Since the box is moving at a constant speed, we can conclude the frictional force equals the applied force:
Magnitude of frictional force = 30 N
Answer:
amplitude
Explanation:
amplitude of a wave is the maximum displacement of a point from its rest position.
hope you get it,
<u>Answer:</u>
a) 480 000 J
b) 43 m/s
<u>Explanation:</u>
a)
To calculate the work done by the engine, we can use the following formula:
.
⇒ 
⇒ 
b)
We know that the work done by the propeller was converted into motion of the sled, which means the propeller provided the sled with kinetic energy.
∴ work done by propeller = kinetic energy gained by sled
⇒ 
⇒ 
⇒ 
⇒ 
⇒ 
This means that its velocity after 40 m was 43 m/s.
