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An 8.40 gram bullet has a speed of 1.13 km/s. Find the bullet kinetic energy if its speed is doubled?
The rotor in a certain electric motor is a flat, rectangular coil with 84 turns of wire and dimensions 2.45 cm by 4.04 cm. The rotor rotates in a uniform magnetic field of 0.800 T. Find the peak power output of the motor
Four identical springs are used as part of a car's system, one on each wheel. what is the spring constant of each of these springs
A rock is shot vertically upward from the edge of the top of a tall building. The rock reaches its maximum height above the top of the building 1.30 s after being shot. Then, after barely missing the edge of the building as it falls downward, the ..
Calculate the potential energy of a rock with a mass of 55 kg while sitting on a cliff that is 27 m high.
A 245 kg person lays on board that is supported only on the ends and that has a mass of 12.0 kg. what is the force on either side where the board is supported
Suppose a radio station emits EM waves uniformly in all directions. What is the maximum power level of this radio station so as to avoid electrical breakdown of air at a distance of 2.0m from the antenna
A spacecraft orbits an unknown planet at a distance of 5.2 x 10^7 m from its center. The period of its orbit is 52 hours. What is the mass of the planet
A 1100kg- car rolling on a horizontal surface has speed = 65km/h when it strikes a horizontal coiled spring and is brought to rest in a distance of 3.0m. What is the spring stiffness constant of the spring
a metal cylinder which has length l and a resistance of 4 ohms is melted down to form a new cylinder with twice the
A tsunami of wavelength 215 km and velocity 550 km/h travels acrossthe Pacific Ocean. how much time do they have to run to safety
A ball is thrown straight upward with an initial speed of 25 m/s. how high does the ball go before falling back down
A satellite is orbiting the Earth at a distance of 3.31RE and with a speed of 3.59 km/s. With what speed would the satellite hit the Earth's surface if somehow it suddenly stopped and fell to Earth? Ignore air resistance.
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