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1. Why do you do no work on a 25- kg backpack when you walk a horizontal distance of 100 mm?
2. The Sun puts out twice as much solar energy in 2 hours as it does in 1 hour. But the solar power of the Sun is the same from one hour to the next. Distinguish between the terms solar energy and solar power.
3. Someone wanting to sell you a Superball claims that it will bounce to a height greater than the height from which it is dropped. Can this be?
4. What famous equation describes the relationship between mass and energy?
5. If two objects have equal kinetic energies, do they necessarily have the same momentum? Defend your answer.
A soccer player kicks a ball horizontally off a 40.0 m cliff into a pool of water. what was the initial speed given to the rock
Derive an expression for the wavelength of light that will vibrationally excite the harmonic oscillator from any quantum level
A slingshot consists of a light leather cup attached between two rubber bands. It takes a force of 30 N to stretch the bands 1.2 cm. What is the equivalent spring constant of the rubber bands
At a certain location, the horizontal component of the earth's magnetic field is 4.90 10-5 T, due north. A proton moves eastward with just the right speed, so magnetic force on it balances its weight. Find the speed of the proton.
A hill that has a 41.8% grade is one that rises 41.8 m vertically for every 100.0 m of distance in the horizontal direction. At what angle is such a hill inclined above the horizontal
a 30.0-kg packing case is initially at rest on the floor of a 1500-kg pickup truck. the coefficient of static friction
An object of mass 5.0 kg is attached to a string of length 2.0 m and rotating in a horizontal circle with an angular velocity of 3.0 rad/s
A large incandescent light bulb used in a spotlight in the 1939 movie "The Wizard of Oz" had an operating temperature of 2500 degrees Kelvin. determine the thermal power from the filament in Joules/second
Your friend has a near point of 142 cm, and she wears contact lenses that have a focal length of 33.2 cm. How close can she hold a magazine and still read it clearly
Two 120 kilogram lead spheres are suspended from 100 meter long mass less cables. The tops of the cables have been carefully anchored exactly 1 meter apart. Find the distance between the centers of the spheres
A 50000-kg railroad freight car collides with a stationary caboose car. They couple together, and 31 percent of the initial kinetic energy is dissipated as heat, sound, vibrations, etc. What is the mass of the caboose?
juggles the clown stands on one end of a teeter-totter at rest on the ground. bangles the clown jumps off a platform
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