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A ball is thrown down vertically with an initial speed of 24 ft/s from a height of 41 ft.
(a) What is its speed just before it strikes the ground? (b) How long does the ball take to reach the ground?
What would be the answers to (c) part a and (d) part b if the ball were thrown upward from the same height and with the same initial speed ? Before solving any equations, decide whether the answers to (c) and (d) should be greater than, less than, or the same as in (a) and (b).
The magnetic field of a cylindrical magnet that has a pole-face diameter of 3.3 cm can be varied sinusoidally between 29.6 T, At a radial distance of 2.0 cm, what is the amplitude of the electric field induced by the variation
A lightning bolt consisting of electrons moves from the cloud to the ground near the equator. What direction is the bolt deflected by the Earth's magnetic field
A pot of water is located in a garage to keep the garage from getting to cold when the weather forecast calls for subfreezing temperatures. Find how long must a standard 1.5 kW heater run to put as much heat into the garage as the water would transf..
A certain humidifier operates by raising water to the boiling point and then evaporating it. Each minute 30 g of water at 20? C is added to replace the 30 g that are evaporated. The heat of fusion of water is 333 kJ/kg, the heat of vaporization is225..
A supertrain of proper length 97 m travels at a speed of 0.91c as it passes through a tunnel having proper length 50 m. As seen by a trackside observer, is the train ever completely within the tunnel? Yes No If so, how much room does it have to spare..
a pendulum clock with a pendulum made of brass isdesignd to keep accurate at temperature 20 dgreecelcius. what is the magnitude of its error
Robert has just bought a new model rocket, and is trying to measure its flight characteristics. how much work is done by the drag force on the rocket during its ascent
a 25.0 mH inductor is in an AC-circuit with a 150 V ac-source which operates at 60.0Hz. find the inductive reactance
a block slips on a greased surface with an initial velocity v0. it experiences a drag force equal to f -cv32 for
A block is on a rough horizontal surface. A horizontal force of magnitude 3 N is applied to the block. What is the frictional force exerted on the block
Two identical particles of mass m approach each other at equal and opposite speeds, v. How much kinetic energy was lost in this collision
Construction cranes are able to balance heavy loads by using a counterweight. The crane operator can slide the entire torque arm horizontally in order to balance the load.
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