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A machine shop has 120 equally noisy machines that together produce an intensity level of 92 dB. If the intensity level must be reduced to 82 dB, how many machines must be turned off?
Consider a rocket-powered hockey puck, and assume the rocket produces a constant acceleration when the rocket is on. Determine the impact location and the impact speed of the puck
A hockey player uses her hockey stick to exert a force of 1.78 N on a stationary hockey puck. What is the acceleration of the hockey puck
A bucket of mass 1.70kg is whirled in a vertical circle of radius 1.55m . At the lowest point of its motion the tension in the rope supporting the bucket is 21.0N. Find the speed of the bucket
A NASA satellite has just observed an asteroid that is on a collision course with the Earth. With what speed will it hit the Earth's surface
You throw a 13.0N rock into the air from ground level and observe that, when it is 13.0m high, Use the work-energy principle to find the maximum height the rock will reach
When yellow light from a sodium lamp shines on a certain photocell, What potential would be needed to stop the electrons if light with 4000 A is used
A visual binary system is at a distance of 5.0 pc. The distance between the two stars subtends an angle of 4.5 arcseconds. What is the mass of each of the stars
A 60.0-g object is attached to a horizontal spring with a force constant of 15.0 N/m, What is the velocity of the object
A proton in a large accelerator has a kinetic energy of 175 GeV. Find the speed of the proton
A 6.0 kg mess kit sliding on a frictionless surface explodes into two 3 kg parts, one moving at 1.5 m/s, What was the original speed of the mess kit
An alarm clock is set to sound in 20 h. At t = 0, the clock is placed in a spaceship moving with a speed of 0.72c (relative to Earth). What distance, as determined by an Earth observer, does the spaceship travel before the alarm clock sounds?
A leather ball of circumference 75.1 cm and mass 583 g is forced to the bottom of a swimming pool and then released. Calculate the buoyant force on the ball
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