A certain crate sits on a rough floor. You find that you have to apply a horizontal force of 200 N to get the crate moving. If you put some massive objects in the crate so that its mass is doubled, how much force does it take to get the crate moving now?
A. Still 200 N
B. 400 N
C. 800 N
D. It depends (specify)
B. 400 N
You might also like to view...
Identifying Groups and Periods Which elements have similar behavior?
a. barium b. silicon c. aluminum d. strontium e. osmium f. beryllium
A 3.00 kg pendulum bob on a string 2.00 m long, is released with a velocity of 2.00 m/s when the support string makes an angle of 45.0 degrees with the vertical. What is the tangential acceleration of the bob at the highest point of its motion?
A. 6.04 
B. 6.89
C. 7.80
D. 8.20
E. 9.02
What is the gravitational force on a 20-kg satellite circling the Earth (radius = 6.4 × 106 m, mass = 6.0 × 1024 kg) with a period of 5.0 h?
A. 88 N B. 55 N C. 36 N D. 98 N E. 18 N
A 2.0-kg block slides down a fixed, rough curved track. The block has a speed of 5.0 m/s after its height above a horizontal surface has decreased by 1.8 m. Assume the block starts from rest. What is the change in mechanical energy of the block caused by the force of friction during this descent?
a. ?14 J b. ?12 J c. ?10 J d. ?16 J e. ?25 J