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1. A 80 kg sprinter runs around a circular track with a radius of 25 m at a velocity of 12 m/s. What type of force causes the runner to turn and what is it's magnitude?
2.Two 8 kg spheres are attached to the ends of a 85 cm rod. The rod is balanced in the center and spun in a circle. The rod can support a max force of 850 N, what is the max frequency of rotation?
3.A 10 kg toy swings in a horiztonal circle with a velocity of 29 m/s around a circular track. If the centripetal force is 1,800 N, what is the diameter of the pathway?
4.An object moves in a circle with a diameter of 10 meters at a frequency of 8 rev/s. What is the period, tangential speed, and centripetal acceleration?
5.A 1,900 kg racecar travels at a constant velocity of 26 m/s around a circular track. If the centripetal acceleration is 8 m/s2, what is the diameter of the track?
What is the speed of a proton whose kinetic energy is 4.2keV
a little boy standing at the cliff 500 m high. He throws a ball straight upward at an initial speed of 20 m/s squared. At a time of 6 seconds after it was thrown, how far above ground is i
An electron is held up against the force of gravity by theattraction of a fixed proton some distance above it. How far above the electron is the proton?
a segment of wire carries a current of 25 a along the x axis from x -2.0 m to x 0 and then along the z axis from z0 to
a harvest mouse can detect sounds as quiet as -10 dB. suppose you are sitting in a field on a very quiet day while a harvest mouse sits nearby at the entrence to its nest, How far is the harvest mouse from the leaf
A hot-air balloon is ascending at the rate of 14 m/s and is 98 m above the ground when a package is dropped over the side. How long does the package take to reach the ground
when the nuclear reactor accident occurred at chernobyl in 1986 2.0times107ci were released into the
After 6.00 kg of water at 77.5 oC is mixed in a perfect thermos with 3.00 kg of ice at 0.0 oC, the mixture is allowed to reach equilibrium. find the change in entropy that occurs
If we observe a star's spectrum and find that the peak power occurs at the border between red and infrared light, what is the approximate surface temperature of the star
Two loudspeakers 5.0 m apart are playing the same frequency. If you stand 11.0 m in front of the plane of the speakers,centered between them, you hear a sound of maximum intensity
A 80 kg man is ice-skating due north with a velocity of 6.0 m/s when he collides with a 35 kg child. find the magnitude of the child's velocity just before the collision
an 18-kg groceryi cart is pushed at constant speed along an aisle by a force of 12N. Find the work done by each of the forces on the cart
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