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A steel ball of mass 0.820 kg is fastened to a cord that is 47.0 cm long and fixed at the far end. The ball is then released when the cord is horizontal, as shown in the figure. At the bottom of its path, the ball strikes a 3.90 kg steel block initially at rest on a frictionless surface. The collision is elastic. Discover (a) the speed of the ball and (b) the speed of the block, both just after the collision.
A battery's ideal voltage is 12.0 V; its internal resistance is 1.46 ohms. what is the actual voltage supplied by the battery
Earth has a net charge that produces an electric field of approximately 150 N/C downward at its surface. (a) What is the magnitude and sign of the excess charge.
tell me how you expect the intensity of light to vary as you move away from the light. tell me why you think this is
A beam of light is emitted 8.0cm beneath the surface of a liquid and strikes the surface 7.0cm from the point directly above the source. If total internal reflection occurs, what can you say about the index of refraction of the liquid?
an object is solid throughout. when the object is completely submerged in ethyl alcohol its apparent weight is 15.0
The output voltage of an AC generator is given by ?v = (120 V) sin (50?t). The generator is connected across a 25.0-? resistor. Find the power delivered to the resistor
A computer disk drive is turned on starting from rest and has a constant angular acceleration. How long did it take to make the first complete revolution
A neighborhood transformer on the top of a utility pole transforms 14.0 kV 60.0 Hz alternating voltage down to 120.0 V to be used inside a house. how many turns does the primary coil have
Water is ejected from a garden hose of radius 1.07 cm at a speed of 5.31m/s. Find the flow rate through the hose.
A standard deck of cards contains 52 different cards. A poker hand consists of five cards, chose randomly. How many different poker hands are there
The switch in a series RL circuit in which R = 5.60 ?, L = 2.10 H, and ?V = 24.2 V is closed at t = 0.0 s. What is the maximum current in the circuit? What is the current when t = 0.375 s?
A person has an exposed body area of 1.2 m2 and a body temperature of 37 oC. What is his heat loss by radiation if the surrounding walls are at a temperature of 22.5 oC? (Round answer to two significant figures)
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