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A Styrofoam slab has thickness h and densityρs. When a swimmer of mass m isresting on it, the slab floats in fresh water with its top at thesame level as the water surface. Find the area of the slab. (Userho_s for ρs, rho_w forρw, h for h, and m for mas necessary.)
Object O1 is 15.9 cm to the left of a converging lens with a 11.8-cm focal length. What is the focal length of the second lens
A bird is flying directly toward a stationary bird-watcher and emits a frequency of 1200 Hz. What is the speed of the bird
tori has very poor physical fitness. she wants to begin to exercisebut she doesnt know where to start . write an
A block of mass undergoes a one-dimensional elastic collision with a block of mass initially at rest. how are their masses related
a pair of hedge trimmers are 45 cm long from the pivot to the end of the handles. if the person applies of a force of
a golfer strikes a ball so that it flies a distance d away landing a height h above its original elevation. the time of
An electron with a speed of 7.00 108 cm/s enters an electric field of magnitude 1.00 103 N/C, traveling along the field in the direction that retards its motion. (a) How far will the electron travel in the field before stopping momentarily?
An astronaut has two objects that are identical in all respects,except that one is painted black and the other is painted silver. Initially, they are at the same temperature.
The position of a particle moving along the x axis is given in centimeters by x = 9.75 + 3.50t 3, where t is in seconds. Calculate the average velocity
the 1994 winter olympics included the aerials competition in skiing. in this event skiers speed down a ramp that slopes
In outer space, far from other objects, block 1 of mass 30 kg is at position m, and block 2 of mass 1350 kg is at position m. What is the (vector) gravitational force acting on block 2 because of block 1? It helps to make a sketch of the situatio..
A converging (lens f=+12cm) in contact with a diverging lens gives a combined focal length of +36 cm, calculate the focal length of the diverging lens
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