Physics Answers

Find the downward force applied 25 cm from the axis of rotation when the torque is found to be 23.75 Nm

A 10.0 kg block is pulled by a 20.0N force at an angle of 37 with the horizontal. If the friction between the block and the surface is negligible, the acceleration of the block is:

A. 1,20 m/s²

B. 120m/s²

C. 160m/s²

D. 16,0m/s²

E. 1,60m/s²

What velocity must a car with a mass of 1120 kg have in order to have the same momentum as a 2310 kg pickup truck traveling at 21 m/s to the east?

A crate of mass 10kg is pulled up a rough incline with an initial speed of 1.5m/s. The pulling force is 100N parallel to the incline, which makes an angle of 20° with the horizontal. The coefficient of kinetic friction is 0.4, and the crate is pulled 5m. (a) How much work is done by the gravitational force on the crate? (b) Determine the increase in internal energy of the crate-incline system owing to friction. (c) How much work is done by the 100N force on the crate? (d) What is the change in kinetic energy of the crate? (e) What is the speed of the crate after being pulled 5m?

How much kinetic energy does a paper airplane have if its going 2m/s and has a mass of 0.01 kg? 

Calculate the potential energy of a 4.5 kg bowling ball that is on the ground. Assume that g = 9.8 m/s2

how far apart should the marks on your ramp be in meters?

What is the acceleration of a car (km/hr²) that goes from 40 km/hr to 80 km/hr in 0.3 hrs

A body of mass 40g runs at a speed of 6km/h what is it kinectic energy?

Discuss the free electron model and its failures