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A coin kept on a rotating gramophone disc just begins to slip if its centre is at a distance of 8 cm from the centre of the disc. The angular velocity of the gramophone disc is then doubled. Through what distance, the coin should be shifted towards the centre, so that the coin will just slip?
Suppose you run into a wall at 4.5 meters per second (about 10 mph). Let's say the wall brings you to a complete stop in 0.5 second. Find your deceleration
if an oscillation of a mass on a spring has 17 times the energy of another oscillation of the same mass on the same
A spaceship moves past you at speed v. You calculate the ship to be 364 m long, whereas an astronaut on the ship measures a length of 420 m. Find v.
You stand on the shore of a small river that measure 10 meters across. You take your cat and throw it into the middle of the stream. How long did it take the cat to reach you
At the Earth's surface, a projectile is launched straight up at a speed of 10.4 km/s. Determine to what height will it rise
We drop a 26-g ice cube (0C) into 1000 g of water (20C). Find the total change of entropy of the ice and water when a common temperature has been reached
A hanging titanium wire with diameter 0.13 cm is initially 2.4 m long. When an 85 kg mass is hung from it, the wire stretches an amount 1.26 cm. Find the approximate value of the effective spring stiffness
A woman holds a tube of lipstick 2.3 cm from a spherical mirror and notices that the image of the tube is upright and one fifth its normal size, Determine the position of the image. Is it in front of or behind the mirror
The energy of the ground state in the Bohr model of the hydrogen atom is -13.6 eV. In a transition from the n = 2 state to the n = 4 state, a photon of energy
q1. the longest string a thick metal wire on a particular piano is 3.0 m long and has a tension of 300.0 n. it vibrates
a bar of gold bar a is in thermal contact with a bar of iron bar b of the same length and area. one end of the compound
A block having a mass of 0.80 kg is given an initial velocity 1.2 m/s to the right on a frictionless surface. What is the maximum compression of the spring
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