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A 23 kg girl is standing on a 2.0 kg cart on a frictionless surface. She is at rest. She then throws a heavy 8.9 kg rock, giving it a speed of 7.5 m/s. What is the final speed of the girl/cart system?
Your spaceship lands on an unknown planet. To determine the characteristics of this planet, you drop a 1.30 kg wrench from 3.50 m above the ground, What is the mass of the planet
At a certain instant, the earth, moon, and a stationary 1500-kg spacecraft are at the vertices of an equilateral triangle of length 3.84 × 108 m. What is the magnitude of the net gravitational force acting on the spacecraft
If gravitational forces alone prevent a spherical, rotating neutron star from disintegrating. Evaluate the minimum mean density of a star that has a rotation period of one millisecond
An ambulance driver traveling at 33.0 m/s honks his horn as he sees a motorist ahead on the highway, Calculate the proper frequency of the ambulance's horn
A light ray initially in water enters a transparent substance at an angle of incidence of 43.0°, Calculate the speed of light in the transparent substance
Every year, there is a foot race to the top of the Empire State Building. The vertical distance traveled (using the stairs!) is about 440 m. what was his average power output during the race
A thin, light wire is wrapped around the rim of a wheel, as shown in the following figure. The wheel rotates without friction about a stationary horizontal axis that passes through the center of the wheel. The wheel is a uniform disk with radius 0..
A person pushes a 12.0kg lawn mower at constant speed with a force of 89.0N directed along the handle, which is at an angle of 45.0 to the horizontal. Calculate the horizontal friction force on the mower
An object is placed 30 cm from a converging lens forms an image 40 cm from the lens. is the image which is formed real or virtual
An object in equilibrium has three forces exerted on it. A 33-N force act at 90° from the x-axis and a 44-N force acts at 60°. What are the magnitude and direction of the third force?
What is the electric field at the test charge?
A uniform disk of mass .53kg and radius 11cm is constrained to rotate on an axis about its center. find the KE attained by the system
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