Recent content by uberbandgeek6

does she have to exert a force proportional to the coefficients of friction?

A 55 kg rock climber is climbing a "chimney" between two rock slabs with her shoes on one side and her back against the other. The static coefficient of friction between her shoes and the rock is 1.1; between her back and the rock it is 0.80. She has reduced her push against the rock until her...

How do I work around the fact that i don't know the length of the sidewalk?

A certain airplane has a speed of 250.0 km/h and is diving at an angle of 30.0° below the horizontal when the pilot releases a radar decoy. The horizontal distance between the release point and the point where the decoy strikes the ground is 700 m. (Neglect air resistance.) How high was the...

I'm not sure how to go about it. I set up the velocities as V(with)=length/2.5 and V(against)=length/8, but I'm not sure what to do from there.

A suspicious-looking man runs as fast as he can along a moving sidewalk from one end to the other, taking 2.50 s. Then security agents appear and the man runs as fast as he can back along the sidewalk to his starting point, taking 8.00 s. What is the ratio of the man's running speed to the...