A teacher place a 75-pound box of stationery on a ramp having an angle of inclination 60 degree to the horizontal and pulls the box up the ramp using a wire harness attached to the end by exerting a force of 80 pounds at an angle of zero degree to the ramp. What is the force of friction restricting the movement of a box if the teacher pulls it up the ramp at a constant speed? Please explain your answer step by step and draw a graph on a single cartesian plane in your note. *

In which of the following cases is work being done on an object? question 2 options: pushing against a locked door carrying a box down a corridor pulling a trailer up a hill suspending a heavy weight with a strong

Samir watches a 100-minute movie on his spaceship. maria's spaceshipe flies in the same direction as samir's spaceship but she observes his move to last 125 minutes and his spaceship to be 40 m long. how long does samir observe his own spaceship to be? according to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does marias voyage take according to samir?

The system is released from rest with the cable taut, and the homogeneous cylinder does not slip on the rough incline. determine the angular acceleration of the cylinder and the minimum coeffi cient s of friction for which the cylinder will not slip.