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A circular disk 0.3 in diameter, pivoted about a horizontal axis through its center , has a cord wrapped around its rim. The cord passes over a frictionless pulley P and is attached to a body of weight 20kg. A uniform rod 1 meter long is fastened to the disk with one end at the center of the disk. The apparatus is in equilibrium, with the rod horizontal as shown.
a. what is the weight of the rod?
b. what is the new equilibrium direction of the rod when a second body weighing 2kg is suspended from the outer end of the rod ?
A motor contains a coil with a total resistance of 10 ohms and is supplied by a voltage of 120V. What is the current the instant the motor is turned on
A spaceship heads away from earth at 0.20C. The ship beams 400nm light towards Earth. What is the wavelength of light received by the ship
A 3.10 kg steel ball strikes a wall with a speed of 10 m/s at an angle of 60 ° with the surface. It bounces off with the same speed and angle. If the ball is in contact with the wall for 0.190 s, what is the average force exerted on the ball by th..
find out where the coyote lands in the canyon.
A 3500 kg block falls vertically through 5 m and then collides with a 400 kg pile, driving it 3.0 cm into bedrock. Assuming that the block-pile collision is completely inelastic, find out the magnitude of the average force on the pile from the bed..
Calculate the rest energy of an electron in joules and Calculate the rest energy of an electron in MeV (1MeV=1.60×10?13J)
A nonconducting solid sphere of radius R has a volume charge density that is proportional to the distance from the center. That is, ? = Ar for r R, Find the expressions for the electric field inside the sphere
A tank, full of liquid of depth h, and top surface area A, is at rest on a frictionless table. Find the radius of the hole in terms of the h, k, ?, x, and g the acceleration of gravity
You have two 120V light bulbs, one 25W and one 100W, that are normally connected in parallel with 120V across each. explain Which one burned out and why
Determine how long it would take an astronaut to fall from a height of 2 meters on the Moon. Compare this time to the time it would take the astronaut to fall the same 2 meters on the Earth. Also, compare the time to the time it would take on the ..
White light shines on a 118nm thick sliver of fluorite (n=1.43). What wavelength is most strongly reflected
a rigid structure consisting of a circular hoop of radius R and mass m, and a square made of four thin bars, each of length R and mass m. What is its angular momentum about that axis
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