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A hot-air balloon is ascending at the rate of 11 m/s and is 59 m above the ground when a package is dropped over the side. (a) How long does the package take to reach the ground? (b) With what speed does it hit the ground?
n unmarked police car traveling a constant 95 km/h is passed by a speeder traveling 130 km/h. how much time passes before the police car overtake the speeder
A certain kind of glass has an index of refraction of 1.650for blue light of wavelength 430nm and an index of 1.615 for redlight of wavelength 680 nm. what is the angle between the two beams inside the glass
A woman walks for 4 min directly north with a average velocity of 6 km/h; then she walks eastward at 4 km/h for 10 min. What is the magnitude of her average velocity
A Klingon spacecraft moves away from Earth at a speed of -.8c. With what speed is the Klingon craft moving as measured by the crew of the Enterprise
A cube of aluminum has an edge length of 20 cm. Aluminum has a density 2.7 times that of water (1 gram/cm$) and a specific heat 0.217 times that of water (1 cal/g °C). When the internal energy of the cube increases by 47000 cal its temperature increa..
A 1200 kg car carrying four 77 kg people travels over a rough "washboard" dirt road with corrugations 4.0 m apart which causes the car to bounce on its spring suspension. By how much does the car body rise on its suspension owing to this decrease i..
A 5.78 cm long rod in the shape of a rectangular solid has cross section dimensions 28.7 mm x 42.6 mm. What is the current in the block
A crate of 48.0 tools rests on a horizontal floor. You exert the gradually increasing horizontal push on it and observe that the crate just begins to move while your force exceeds 344. After that you must reduce your push to 260 to keep it moving at ..
A 62-kg skier speeds down a trail. The surface is smooth and inclined at an angle of 22 with the horizontal. Determine the normal force acting on the skier
A block of unknown mass is attached to a spring of spring constant 6.1 N/m and undergoes simple harmonic motion with an amplitude of 9.5 cm. Calculate the mass of the block
A quarter-pound hamburger with all the fixings has a mass 210g . The food energy of the hamburger is 2.4MJ. What is the energy equivalent of the mass of the hamburger
a baseball is thrown from the roof of a building of height 20.6 with an initial velocity of magnitude 14.0 and directed
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