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1. under what condition is the cross product of two vectors of a fixed magnitude maximum?2. what is the value of the vertical component of the velocity fora projectile at the top of its trajectory?3. what is the vector of acceleration foran object moving at constant speed around a circular path?
A person pulls a toboggan for a distance of 50.0 m along the snow with a rope directed 25.0° above the snow. The tension in the rope is 78.0 N. How much work is done on the toboggan by the tension force
In attempting to pass the puck to a teammate, a hockey player gives it an initial speed of 2.1 m/s. What minimum initial speed should the puck have been given so that it reached the teammate
American football uses a field that is 100.0 yd long, whereas a soccer field is 100.0 m long. Which field is longer, and by how much
Two round rods, one steel and the other copper, are joined end to end. Each rod is 0.795m long and 1.85cm in diameter. The combination is subjected to a tensile force with magnitude 3950N.
In tae-kwon-do, a hand is slammed down onto a target at a speed of13m/s and comes to a stop during the4.4ms collision. find the magnitude of the impulse on the hand from the target
A hot-air balloon is rising straight up with a speed of 1.47 m/s. Aballast bag is released from rest relative to the balloon when itis 9.87 m above the ground. How much time elapses before theballast bag hits the ground?
2 kg block slides on a rough horizontal surface. the block hits a spring with a speed of 2.4 m/s and compresses it a distance of 11 cm before coming to rest. what is the force constant of the spring
The activity of a freshly prepared radioactive sample is 1010 disintegrations per second, whose mean life is 109 s. find the mass (in mg) of the radioactive sample
Water flows straight down from an open faucet. The cross sectionalarea of the faucet is 1.8x10-4 m2, and thespeed of the water is 0.85 m/s as it leaves the faucet. Ignoringair resistance, find the cross-sectional area of the water streamat a point 0...
How much heat is required to raise the temperature of 0.265kg of water from 20.4 degrees C to 31.8 degrees C
An elephant's legs have a reasonably uniform cross section from top to bottom, and they are quite long, pivoting high on the animal's body. how many steps per minute will the elephant take
starting from rest, a 4.0-kg crate of cell phones reaches a horizontal speed of 8.0 m/s in 2.0 s. What is the net force acting on the crate
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