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Q. Two astronauts, one of mass 61 kg and the other 80 kg, are initially at rest in outer space. They then push each other apart. How far apart are they when the lighter astronaut has moved 15 m?
Q. An airplane is flying with a velocity of 99.0 at an angle of 26.0 above the horizontal. When the plane is a distance 123 directly above a dog that is standing on level ground, a suitcase drops out of the luggage compartment.
A water molecule can vibrate in various ways, but the easiest kind of vibration to excite is the "flexing" mode in which the hydrogen atoms move toward and away from each other by HO bonds do not stretch.
A coffee filter of mass 1.5 grams dropped from a height of 1 m reaches the ground with a speed of 0.7 m/s. How much kinetic energy Kair did the air molecules gain from the falling coffee filter.
A string of 13 identical Christmas tree lights are connected in series to a 127 V source. The string dissipates 63 W. What is the comparable resistance of light string.
The objects are then released from rest. Assuming that the particles never reach the pulley, and also that the particles do not rebound when they strike the ground.
What are speed and direction of the ball after the collision
A roller coaster is towed up an incline at a steady speed of 0.51m/s by a chain parallel to the surface of the incline. The slope is 2.85 % that means that the elevation increases by 2.85 m for every 100m of horizontal distance.
A 45 kg girl is standing on a 130 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. The girl begins to walk along the plank at a constant velocity of 1.33 m/s relative to the plank.
What must the banking angle of the curves be so that the force of the pavement on the tires of the car is in the normal direction.
The front 1.20 m of a 1600 kg car is designed as a "crumple zone" that collapses to absorb the shock of a collision.
A 25 g of copper pellets are removed from a 300 C oven and immediately dropped into 120 mL of water at 18 C in an insulated cup. What will the new water temperature be.
The coefficient of kinetic friction is 0.50. A horizontal force of magnitude 87 N begins to pull directly on the block. In unit-vector notation, what are the resulting accelerations of (a) block and (b) slab.
Now a peg is placed 4/5 of the way down the pendulum's path so that when the mass falls to its vertical position it hits and wraps around the peg. As it wraps around the peg and attains its maximum height it ends a distance of 3/5 L below its startin..
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