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A pendulum of length 130 cm swings with an amplitude of 1.6 cm. Its mechanical energy is 5.0 mJ. What is the mechanical energy of the same pendulum when it swings with an amplitude of 3.7 cm?
mJ
A 2.0 N force is applied to the plunger of a hypodermic needle. The diameter of the plunger is 1.2 cm and that of the needle is 0.30 mm. With what force does the fluid leave the needle
A person looks horizontally at the edge of a swimming pool. If its length is 5.00m, and the pool is filled to the surface, to what depth (in m) could observer see? For water is 1.33).
Anemometers (pictured) are used to measure wind speeds. Wind striking the cups causes the assembly to rotate; a gauge measures the frequency of this rotation and translates the data into wind speed. calculate the number of turns in the coil wire
The maximum pressure that can be obtained in your local mechanic's hydraulic pump is 2.0 x 10^5 Pa. what is the largest mass (of car) for which the pump will work
A magnetic field is perpendicular to the plane of a single-turn circular coil. The magnitude of the field is changing, so that an emf of 0.95 V, What emf and current are induced in the square coil
What is the crankshaft's angular acceleration, How many revolutions does it make while reaching 3600{\rm rpm}
Suppose that the electric potential outside a living cell is higher than that inside the cell by 0.069 V. How much work is done by the electric force
A nuclearpower planthas a reactor that produces heat at the rate of870MW. At what rate is heat discarded to the environment by this power plant
A farm tractor tows a 3550-kg trailer up a 18?incline with a steady speed of 3.0 m/s. What force does the tractor exert on the trailer
A softball, of mass m = 0.183 kg, is pitched at a speed v0 = 26.9 m/s. Due to air resistance, by the time it reaches home plate it has slowed by 11.9%. Calculate the average force of air resistance
A planet of mass m = 1.35 × 10^24 kg is orbiting in a circular path a star of mass M = 7.35 × 10^29 kg. What is the orbital period (in earth days) of the planet Tplanet
you rub your hand across a small surface section of a pillow. The section of pillow acquires a net charge of -9.4 muC, Determine the net charge on your hand
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