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If a iron core of a collapsing star initially spins with a rotational frequency of fo=3.4 per second and the core radius decrease during the collapse by a factor of 24. what is the rotational frequency of the iron core at the end of collapse
At every point on the surface of a sphere of radius 0.4 m the electric field is radially outward, with a magnitude of 20 N/C
A displacement vector at an angle of 150 degrees (counter clockwise) from the x axis has a y component equal to 123 meters
A rock is thrown vertically upward with a speed of 19.0m/s from the roof of a building that is 70.0m above the ground. What is the speed of the rock just before it strikes the ground
A pendulum, consisting of a ball of mass m on a light string of length 1.00 m, is swung back to a 45° angle and released from rest. What is the velocity of the ball immediately after the collision
When looping the loop, the Blue Angels stunt pilots of the U.S Navy fly their jet aircraft along a vertical circle of diameter 1000 m. At the top of the circle, find the acceleration relative to the aircraft of a small body
A steel ball of mass 0.400 kg is fastened to a cord that is 60.0 cm long and fixed at the far end. The ball is then released when the cord is horizontal. Find the speed of the block just after collision
Using the fact that the earth spins on its axis once per day, calculate the earth's orbital angular speed (in ) due to its motion around the sun.
A football player with a mass of 89 kg and a speed of 2.1 m/s collides head-on with a player from the opposing team whose mass is 120 kg. Find the speed of the second player
A lead bullet (? = 11.3 X 103 kg/m3) is placed in a pool of mercury (? = 13.6 X 103 kg/m3). What fractional part of the volume of the bullet is submerged
A 13 turn circular loop of wire has a diameter of 0.66m. The plane of the circular loop creates an angle of 63 to the Earth's magnetic field. In 0.15s the coil is flipped at a location where the magnitude of the Earth's magnetic field is 34 μT.
Calculate the vertical component of its velocity by the time it hits the ground
Speedy Sue, driving at 34.0m/s, enters a one-lane tunnel. She then observes a slow-moving van 175m ahead traveling with velocity 5.40 m/s. Sue applies her brakes but can accelerate only at 2.00 m/s2 since the road is wet. Will there be a collision..
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