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A girl is skipping rocks across a lake. One of the rocks accidentally ricochets off a toy boat initially at rest in the water. The 0.086 kilogram rock strikes the boat at a velocity of 13 m/s, 15 degree below due east, and ricochets off at a velocity of 11 m/s, 12 degree above due east. After being struck by the rock, the boat's velocity is 1.2 m/s, due east. Find what is the mass of the boat? Suppose the water offers no resistance to the boat's motion.
An 75.0-N crate of apples sits at rest on a ramp that runs from the ground to the bed of a truck. The ramp is inclined at 30.0° to the ground. What is the direction of the contact force
A projectile is fired with muzzle speed 150m/s, Where does the projectile hit the ground with what speed
A 0.250 block moving vertically upward collides with a light vertical spring and compresses it 4.00 before coming to rest. If the spring constant is 53.0 , what was the initial speed of the block? (Ignore energy losses to sound and other factors d..
A 39-kg girl is bouncing on a trampoline. During a certain interval after leaving the surface of the trampoline, How high does she rise during this interval
The back wall of a home aquarium is a mirror that is a distance of 33.0 cm away from the front wall. The walls of the tank are negligibly thin, Calculate the apparent distance between the fish and the front wall
Four objects are situated along the y axis as follows: a 1.94-kg object is at +2.98 m, Where is the center of mass of these objects
Two bicycle tires are set rolling with the same initial speed of 3.40m/s along a long, straight road, What is the coefficient of rolling friction r for the tire under low pressure
the intensity of a laser beam is 450 wm2. what is the rms value of the electric field of this laser beam? careful-rms
tarzan swings on a vine from a cliff to rescue jane who is standing on the ground surrounded by snakes. his plan is to
light of wavelength 700 nm falls on a 0.38 mm wide slit and forms a diffraction pattern on a screen 1.3 m away.a find
in a holography setup such as that of fig. 15-5 the distance and the distance . what must be the frequency width of
The mass of a regulation tennis ball is 52.0g (although it can vary slightly), and tests have shown that the ball is in contact with the tennis racket for 26.0m/s}. what impulse did he exert on the ball
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