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A speeder is pulling directly away and increasing his distance from a police car that is moving at 23 m/s with respect to the ground. The radar gun in the police car emits an electromagnetic wave with a frequency of 6.9 x 109 Hz. The wave reflects from the speeder's car and returns to the police car, where its frequency is measured to be 210 Hz less than the emitted frequency. Find the speeder's speed with respect to the ground.
An isolated conductor of arbitrary shape has a net charge of +1.2 10-5 C. What is the charge on the cavity wall
A railroad car of mass 2.00 x 10^4 kg moving at 3.00 m/s collides and couples with two coupled railroad cars, What is the speed of the three coupled cars after the collision
q1. you are driving home from school steadily at 80 for 150. it then begins to rain and you slow to 50. you arrive home
In one design, a large spring with spring constant 2×10^4 N/m was placed behind the cannon. The other end of the spring braced against a post that was firmly anchored to ship's frame.
A pendulum is 1.20 metres long. What is the speed of the bob when it passes by its equalibrium position if it is pulled aside until it makes an angle of 25 degrees to vertical.
How long after the beginning of the power failure would it have taken the flywheel to stop if the power had not come back on? Explain how many revolutions would the wheel have made during this time?
We have a container of a hot ideal monatomic gas. The volume of the container is 25 liters. The temperature of the gas is 398 C, Find the change of internal energy of the gas
A spring is attached to the bottom of an empty swimming pool, Determine the percentage of the block's total volume that is hollow
A sphere of radius r starts from rest and rolls without slipping along a curved surface, dropping through a vertical distance of 0.303 m. Find the final speed v of the sphere's center of mass
A stone tosses at an angle of 60 degrees to the horizontal from the roof of a building at 10 m/s hits the ground in 3s. how far from the building did it land
Wrongly called for a foul, an angry basketball player throws the ball straight down to the floor. what was the ball's greatest height above the floor
A block slides down an inclined plane, starting from rest and being pushed with a constant acceleration of 4.95 m/s2 over a distance of 21.6 cm. Find the total time the block is in motion
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