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A sled slides without friction down a small, ice covered hill. If the sled starts from rest at the top of the hill, its speed at the bottom are 7.50 m/s. A) On the second run the sled starts with a speed of 1.50m/s at the top. When it reaches the bottom of the hill is its speed 9.00 m/s, more than 9.00m/s, or less than 9.00m/s. Explain. B) Discover the speed of the sled at the bottom of the hill after the second run.
A 116-rad dose of radiation is administered to a cancer patient (mass = 76) kg). how much energy is absorbed
a solid aluminum ingot weighs 89n in the air. the ignot is suspended from a rope and totally immersed inn water. what is the tension in the rope
When one person shouts at a football game, the sound intensity level at the center of the field is 61.1 dB. determine how many people are at the game
A ball is thrown horizontally from the top of a tower 30m high and lands 15m from its base. What is the ball's initial speed
An organ pipe is shown to resonate at 240 Hz, 320 Hz, and 400 Hz. It does not resonate at any other frequencies between 240 Hz and 400 Hz, How long is the organ pipe
protons in an accelerator at the fermi national laboratory near chicago are accelerated to a total energy that is 400
Camera lenses are explained in terms of their focal length. A 50 mm lens has a focal length of 50 mm. A camera is focused on an object 110 m away using a 830mm lens.
What is the direction of the electric field at point P and determine the linear charge density. Put your answer in terms of q, L, a, and physical constants.
A 10000 kg empty railroad car moving at 3 m/s collides with a loaded railroad car weighing 196000 N and couples with it. What is the final velocity of the combined railroad cars
An 88 g arrow is fired from a bow whose string exerts the average force of 110 N on the arrow over a distance of 78.00 cm. What is the speed of the arrow as it leaves the bow.
Three identical conducting spheres initially have following charges: sphere A, 5Q; sphere B, -7Q; and sphere C, 0. Spheres A and B is fixed in place, with a center-to-center separation that is much larger than the spheres.
A particle is located at position r = 3mi +4mj and the force acting on the particle is F = 5Ni + 7N j. Evaluate what is the torque on the particle
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