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A pendulum consists of a 2.0 kg stone swinging on a 3.9 m string of negligible mass. The stone has a speed of 7.2 m/s when it passes its lowest point. a) What is the speed when the string is at 60° to the vertical? (in m/s) b) What is the greatest angle with the vertical that the string will reach during the stone's motion? c) If the potential energy of the pendulum-Earth system is taken to be zero at the stone's lowest point, what is the total mechanical energy of the system? (in Joules)
A man runs with a speed of 6 m/s off a platform that is 10 mabove the water. How fast is he moving when he hits the water
A horizontal force of magnitude 31.2 N pushes a block of mass4.42 kg across a floor where the coefficient of kinetic friction is0.631. What is the increase in the kinetic energy of the block
A jet is circling an airport control tower at a distance of 18 km. An observer in the tower watches the jet cross in front of the moon. Find the distance traveled (in meters) by the jet
A uniform horizontal beam 5.00 m long and weighing 320 N is attached to a wall by a pin connection tht allows the beam to rotate. How far out on the beam can the person stand without breaking the cable
A hollow metal sphere carries a charge of 5.0 μC. A second hollow sphere with a radius that is 4 times the size of the first carries a charge of 15.0 μC. How much charge is on the smaller sphere
A 12.5-kg horizontal plank 4.00 m long rests on two supports, one at the left end and a second 1.00 m from the right end
A defiblirator is used during a heart attact to restore theheart to its normal beating ppattern. How much charge moves during this time
a 100 ohm resistor, a 0.100micro F capacitor, and a 300mH conductor are connected in series to a voltage source with amplitude 240 V, hat is the maximun voltage across the capacitorat resonance
an airplane with a wingspan of 100m flies parallel to the earth's surface at a point where the downward component of the earth's magnetic field is 0.500 x 10^-4 T. what is the reading of the voltmeter
A wrecking ball (weight = 4800 N) is supported by a boom, which may be assumed to be uniform and has a weight of 3600 N. As support cable runs from the top of the boom to the tractor.
The maximum acceleration of a fast freight elevator is 4.5 m/s2. The maximum load of the elevator is 6,651 kg, and the elevator has a mass of 466 kg. If a steel cable is to be used suspend the elevator, what should the minimum diameter be? The elasti..
Imagine your car is powered by a fusion engine in which the following reaction occurs: 31H2 ---->2He4 + 1H1 + 0n1 The atomic masses are 1H2 ( 2.0141 u), 2He4 (4.0026 u), 1H1 (1.0078 u), and 0n1 (1.0087 u). The engine uses 4.28 x 10-6 kg of deuterium ..
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