The same constant force is used to accelerate two carts of the same mass, initially at rest, on horizontal frictionless tracks. the force is applied to cart a for twice as long a time as it is applied to cart b. the work the force does on a is wa; that on b is wb. which statement is correct?
a. wa = wb.
b. wa = wb.
c. wa = 2 wb.
d. wa = 4 wb.
e. wb = 2 wa

Why does the input force have to be greater than the force needed to lift the bale?

Suppose that two tanks, 1 and 2, each with a large opening at the top, contain different liquids. a small hole is made in the side of each tank at the same depth 1.57 m below the liquid surface, but the hole in tank 2 has 2.49 times the cross-sectional area of the hole in tank 1. (a) what is the ratio ρ1/ρ2 of the densities of the liquids if the mass flow rate is the same for the two holes? (b) what is the ratio rv1/rv2 of the volume flow rates from the two tanks? (c) at one instant, the liquid in tank 1 is 14.9 cm above the hole. if the tanks are to have equal volume flow rates, what height above the hole must the liquid in tank 2 be just then?

Asher cycles 12 miles in 16 hours. what is his speed?