Q: A 68.5-kg astronaut is doing a repair in
A 68.5-kg astronaut is doing a repair in space on the orbiting space station. She throws a 2.25-kg tool away from her at 3.20 m/s relative to the space station. With what speed and in what direction w...
See AnswerQ: The expanding gases that leave the muzzle of a rifle also contribute
The expanding gases that leave the muzzle of a rifle also contribute to the recoil. A .30-caliber bullet has mass 0.00720 kg and a speed of 601 m>s relative to the muzzle when fired from a rifle that...
See AnswerQ: Two figure skaters, one weighing 625 N and the other 725
Two figure skaters, one weighing 625 N and the other 725 N, push off against each other on frictionless ice. (a) If the heavier skater travels at 1.50 m/s, how fast will the lighter one travel? (b) Ho...
See AnswerQ: A small rock with mass 0.20 kg is released from
A small rock with mass 0.20 kg is released from rest at point A, which is at the top edge of a large, hemispherical bowl with radius R = 0.50 m (Fig. E7.9). Assume that the size of the rock is small c...
See AnswerQ: Squids and octopuses propel themselves by expelling water. They do this
Squids and octopuses propel themselves by expelling water. They do this by keeping water in a cavity and then suddenly contracting the cavity to force out the water through an opening. A 6.50-kg squid...
See AnswerQ: In a certain track and field event, the shotput has a
In a certain track and field event, the shotput has a mass of 7.30 kg and is released with a speed of 15.0 m/s at 40.0° above the horizontal over a competitor’s straight left leg. What are the initial...
See AnswerQ: You are standing on a sheet of ice that covers the football
You are standing on a sheet of ice that covers the football stadium parking lot in Buffalo; there is negligible friction between your feet and the ice. A friend throws you a 0.600-kg ball that is trav...
See AnswerQ: On a frictionless, horizontal air table, puck A (with
On a frictionless, horizontal air table, puck A (with mass 0.250 kg) is moving toward puck B (with mass 0.350 kg), which is initially at rest. After the collision, puck A has a velocity of 0.120 m/s t...
See AnswerQ: When cars are equipped with flexible bumpers, they will bounce off
When cars are equipped with flexible bumpers, they will bounce off each other during low-speed collisions, thus causing less damage. In one such accident, a 1750-kg car traveling to the right at 1.50...
See AnswerQ: Two identical 0.900-kg masses are pressed against opposite
Two identical 0.900-kg masses are pressed against opposite ends of a light spring of force constant 1.75 N/cm, compressing the spring by 20.0 cm from its normal length. Find the speed of each mass whe...
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