Which of the following best describes a noncontact force
1 answer:
You might be interested in
Answer:
-2000 N
Explanation:
To solve the problem, we can use the impulse theorem, which states that the impulse is equal to the change in momentum of the car:
where
F is the average breaking force
is the stopping time
m = 1000 kg is the mass of the car
is the change in velocity of the car
Solving the equation for F,
Answer:
Explanation:
The work (W) done on the cube to be pushed across the floor is equal to the total thermal energy (ΔE) of the system:
(1)
Also, the work done on the cube by the horizontal force is giving by:
(2)
<em>where F: force applied to the cube , d: displacement of the cube </em>
<em>By equaling the equations (1) and (2)</em>, we can find the thermal energy of the floor:
So, the increase in the thermal energy of the floor is 51 J.
Have a nice day!