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1. A uniform disk of mass 1 kg is spinning on its (vertical) axis of symmetry (remember rotational inertia of a disk is given by 0.5mr^2), with an angular velocity of 6 rad/s. A piece of mud of mass 1 kg is dropped on the disk halfway between the center and the edge and the disk slows down. What is it's angular velocity now? Answer in rad/s.
2. A small child is on a merry go round which is spinning (no friction) freely. He crawls from the center to towards the rim. As he does this, angular momentum conservation will dicate that:
a) rate of turning stays the same
b) merry go round slows down
c) merry go round speeds up
3. A mother rabbit has a mass of 0.8 kg. Her baby has a mass of 0.1 kg. Both rabbits are skinned to make clothes. The baby has 40 cm^2 of skin. How much does the mother have? Answer in cm^2
The average speed of a nitrogen molecule in air is about 6.70 e2m/s, and its mass is about 4.68e-26 kilogram. Find what average force does the molecule exert on the wall
a. a lever is used to lift a heavy load. when a 40 n force pushes one end of the lever down 2.2 m the load rises 0.8 m.
An airplane takes off and flies 225 km on a course of 25 degrees north of west and then changes direction and flies 135 km due north where it lands. At what angle is the plane from the starting point
A rock is tossed straight up by a velocity of 33.3 m/s. When it returns, it falls into a hole 22.5 m deep. What is the rock's velocity as it hits the bottom of the hole?
What least heat is needed to bring 80 of water at 20 to the boiling point and completely boil it away? (answere in Joules).
A ball is thrown straight up from ground level. It passes a 2-m-high window. The bottom of the window is 7.5 m off the ground. The time that elapses from when the ball passes the bottom of the window on the way up, to when it passes the top of the wi..
Where would you look on the photographic plate for evidence of a mass-21 isotope of neon? And what accelerating voltage would allow these mass-21 ions.
what is the activity in nuclear medicne
Ball bearings can be made by letting spherical drops of molten metal fall in a tall tower - called a shot tower - and solidify as they fall. If a bearing needs 4.0s to solidify enough for impact, how high should the tower be?
What is the magnitude of(a) the force of the biceps muscle on the lower arm and(b) the force between the bony structures at the elbow contact point?
turning a laser you shine the beam on an object located nearby and observe the interference pattern with a suitable
If a metric ton is 1.000 x10^e3 kg, how many 74 kg people can safely occupy an elevator that can hold a maximum mass of accurately 1 metric ton.
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