You are holding on to the axle of a spinning bicycle wheel with ...

[tichca]

You are holding on to the axle of a spinning bicycle wheel with one hand on either side of the wheel. The top part of the wheel is moving away from you and the bottom is moving toward you and the axle is horizontal.
 
  In what direction do you need to apply a torque for the wheel to turn to the left? A) toward you
  B) away from you
  C) vertically up
  D) vertically down
  E) to your right

Question 2

Three boxes rest side-by-side on a smooth, horizontal floor. Their masses are 5.0 kg, 3.0 kg, and 2.0 kg, with the 3.0-kg mass in the center. A force of 50 N pushes on the 5.0-kg mass, which pushes against the other two masses.
 
  What is the contact force between the 5.0-kg mass and the 3.0-kg mass? A) 0 N
  B) 10 N
  C) 25 N
  D) 40 N
  E) 50 N

[mmpiza]

Answer to Question 1

A

Answer to Question 2

C

[tichca]

Excellent

[cpetit11]

Gracias!