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Batman whose mass is 80 kg is dangling on the free end of a 12 m rope, the other end of which is fixed to a tree limb above. By repeatedly bending at the waist, he is able to get the rope in motion, eventually making it swing enough that he can reach a ledge when the rope makes a 60? angle with the vertical. How much work was done by the gravitational force on Batman in this maneuver.
The bullet strikes a block of wood and penetrates to a depth of 15 cm. What resistive force (assumed to be constant) does the wood exert on the bullet? Explain how long does it take the bullet to come to rest?
Three insulating balls are suspended from thin threads. Various objects are then rubbed against other objects and each of the insulating balls is charged by touching them with one of these objects. In each case.
question1a siphon tube is filled with gasoline and closed at each end. one end is inserted into a gasoline tank 0.15 m
A copper telephone wire has essentially no sag between poles 20.5 meters apart on a winter day while the temperature is -15.5° C. How much longer is the wire on the summer day when the temperature is 27.0° C.
A certain amount of work is required to stretch spring A a certain distance. Compare the spring constants of the two springs
The pilot of an airplane executes a loop-the-loop maneuver in a vertical circle. What is the pilot's apparent weight at the lowest point if his true weight is 160 lb
A 73 kg parachutist descends during a vertical height of 420 m with constant speed. Find the increase in entropy produced by the parachutist; assume the air temperature is 21°C.
A baseball thrown at an angle of 55.0 above the horizontal strikes a building 18.0 away at a point 8.00 above the point from which it is thrown. Find the magnitude of the initial velocity of the baseball
A thin film of glass (n = 1.48) floats on a liquid of n = 1.35 and is illuminated by light of ? = 600 nm incident from air above it. Find the minimum thickness of the glass
A parallel-plate capacitor is constructed using a dielectric material whose dielectric constant is 2.70, Find the minimum area of the capacitor plates
A force of 7 pounds is required to hold a spring stretched 0.5 feet beyond its natural length. How much work (in foot-pounds) is done in stretching the spring from its natural length to 0.9 feet beyond its natural length.
A syringe has an area of 1.5 cm2 at its barrel and then narrows down to an area of 0.11 mm2 at the needle end. what is the force produced at the tip of the needle
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