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Use the work-energy theorem to solve each of these problems. Youcan use Newton's laws to check your answers. Neglect air resistancein all cases.
a) A branch falls from the top of a96.0-m-tall redwood tree, startingfrom rest. How fast is it moving when it reaches the ground?b) A volcano ejects a boulder directly upward 510 m into the air. How fast was the bouldermoving just as it left the volcano?c) A skier moving at 5.45 m/sencounters a long, rough horizontal patch of snow havingcoefficient of kinetic friction 0.220 with her skis. How far does she travel on this patch before stopping?d) Suppose the rough patch in part (c) was only 2.90 m long? Howfast would the skier be moving when she reached the end of thepatch?e) At the base of a frictionless icy hill that rises at 25.0°above the horizontal, a toboggan has a speed of 10.0 m/s toward the hill. How high verticallyabove the base will it go before stopping?
A block of ice of mass 100 g and at 00 C is dropped into 500 g of water at 800 C in a Styrofoam cup. describe the process of each heat loss or gain
A hockey player uses her hockey stick to exert a force of 1.78 N on a stationary hockey puck. What is the acceleration of the hockey puck
A 550 N physics student stands on a bathroom scale in an elevator. As the elevator starts moving, the scale reads 450N. (a) Find the acceleration of the elevator. Find the mass of the worker.
Which kind of research is Professor Carter employing.
The frequency doubled output of a Nd3+ YAG laser has a wavelength of 532nm. If each pulse of light has a total energy of 0.550J and the repetition rate of the laser is 30Hz, how many photons does the laser emit at 532nm in 3 minutes.
A large gear is made by starting with a solid metal disk of mass 5 kg and radius 25 cm. Determine the moment of inertia for the gear spinning
A long wire is known to have a radius greater than 4.0 mm and to carry a current that is uniformly distributed over its cross section. What is the radius of the wire
Three resistors are connected in series across a 11-V power supply. what is the exact potential drop (in volts) across resistor 3
A thin, uniform, metal bar, 3 m long and weighing 90 N, is hanging vertically from the ceiling by a frictionless pivot. Find the angular speed of the bar just after the collision
A 11.0 kg monkey starts to climb a long rope to reach a banana located at a height of 6.50 m, Calculate the least amount of time the monkey could take to reach the banana without breaking the rope
Under certain conditions, the human body can withstand an acceleration of 10 g's. What is the net force (in Newtons) acting on a person
A simple pendulum is made of a small blob of mass m = 9.500 kg attached to the end of an inextensible wire. find the magnitude of the tension in the wire
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