Mechanics | Relativity Answers

Weights of 5, 6, 8, and 10 N are hung from a 12 m rod at distances 2, 5, 7, and 8 m from the left end. Neglecting theweight of the rod, how far from the left end is the center of gravity?

The centers of a 42 N sphere and a 12 N sphere are connected by a light rod 160 mm in length. How far from the middle of the 42 N sphere is the center of gravity?

A horizontal, 8 m boom weighing 400 N is hinged at the wall, as shown in Fig. 5.19. A cable is attached at a point 4.3 m
away from the wall, and a 1150 N is attached to the right end. What is the tension in the cable?

A bridge whose total weight is 4500 N is 20 m long and supported at each end. Find the forces exerted at each end when a
1600 N tractor is located 5 m from the left end.

Weights of 10 N, 16 N, and 30 N are placed on a meterstick at 21 cm, 40 cm, and 61 cm respectively. The meterstick is
balanced by a single support at its midpoint. At what point may a 9 N be attached to produce equilibrium?

a rocket with a mass of 400 lb travels at 27000 ft per sec. what is its kinetic energy in ft-lbf?

A uniform 7 m bar has weight of 27 N. A 50 N weight is hung from the left end, and a 15 N weight is hung at the right end.
How far from the left end will a single upward force produce equilibrium?

A rocket with a mass of 400 lbm travels at 27000 ft/sec. What is it's kinetic energy in ft-lbf

An object of mass m = 100g falls freely during 3sec:

a) Find the received impulse,

b) Deduce the change of the speed

uniform meterstick is balanced at its midpoint with a single support. A 65 N weight is suspended at the 39 cm mark. At
what point must a 40 N weight be hung to balance the system?