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If a spacecraft is launched from the Moon at the escape speed of the Earth, how fast will the spacecraft be going when it is very far away from the Moon, ignoring the effects of other celestial bodies?
a uniform 12.0kg ladder is 4.0m long and is placed against a frictionless wall at 30 degress. find the frictionless force at the floor necessary to maintaain equilibrium
A car is traveling 80 m/s from left to right when the brakes are applied. (The acceleration is constant.) After 15s, it comes to a stop. How far did it travel before it came to a stop
Five 5 ohms resistors are connected in series with a 15 Volt battery. Determine the equivalent resistance of the circuit
In a simplified Bohr model of the hydrogen atom, an electron is assumed to be traveling in the n = 6 circular orbit of radius 1.90×10-9 m around a proton. Compute the speed of the electron in that orbit.
An x-ray tube used for cancer therapy operates at 4.0MV, with a beam current of 25mA striking the metal target. Nearly all the power in this beam is transferred to a stream of water flowing through holes drilled in the target. What rate of flow, i..
A 700 N man stands in the middle of a frozen pond of radius 5.0 m. He is unable to get to the other side because of a lack of friction between his shoes and the ice. To overcome this difficulty, he throws his 1.2 kg physics textbook horizontally t..
Two small conducting spheres are separated by a distance of 25.0 cm. One carries a charge of 30.0 µC while the other carries a charge of +45.0 µC. What is the magnitude of the force experienced by one sphere due to the other
a hollow conducting spherical shell of radius 1.20 cm carries a charge of -5.20 nc. what is the electric field at a
You drive your 1,345-kg car at a constant speed of 23 mph a distance of 71 m down a ramp that has a grade of 14 %. Define positive direction in the forward direction
a spring with a spring constant of 500 nm is used to propel a 0.41-kg mass up an inclined plane. the spring is
Use the simulation in the cannon interactive in this section to answer the following questions. (a) Does cannonball's horizontal velocity change as it moves through the air? (b) Does its vertical velocity change? (c) If you enhance the cannonball's h..
q1. what must the charge sign and magnitude of a particle of mass 1.47 g be for it to remain stationary when placed in
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