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A quarter (diameter = 2.40 cm) is held at arm's length (64.0 cm). The sun has a diameter of 1.39 x 10^9 m and is 1.50 x 10^11 m from the earth. What is the ratio of the angular size of the quarter to that of the sun?
An artificial satellite circles the Earth in a circular orbit at a location where the acceleration due to gravity is 7.28 m/s2. Determine the orbital period of the satellite
Two identical 10 g iron springs, except that one has been wound using work W, are dropped into equal volumes of 15M HC1 in two identical constant volume calorimeters, that are adiabatically insulated. The HC1 will dissolve iron springs. What differen..
A car is traveling away from you at 40.0 mi/h. The car horn produces a sound at a frequency of 480 Hz. What frequency do you hear
Light inside an optical fiber tube hits the wall between the tube and air. What is the index of refraction of the tube
One mol of aluminum at a uniform temp of 0C is placed in thermal contact with a 2nd mol of aluminum which, initially is at a uniform temp of 200C. The pressure in the system is maintained at 1 atm.
A reading on a Geiger counter of 0.23 mrad/h is based on assuming that the measured radiation is due to cesium-137, How many ?-rays does the person's body absorb every second
2.50 kg block slides down the inclined plane at a 20.0degree angle as shown below. Calculte the work done by the force of friction
Determine the dimentions (in cm) of a rectangular aluminum block (also 40 cm long) that would have the same resistance between the farthest opposing sides as the silver block (part a)
In a dentist's office an X-ray of a tooth is taken using X-rays that have a frequency of 7.60 × 1018 Hz. What is the wavelength in vacuum of these X-rays
A loudspeaker of mass 21.0 {rm kg} is suspended a distance of h = 2.40 {rm m} below the ceiling by two cables that make equal angles with the ceiling. Each cable has the length of l = 3.90 {rm m}.
Angel Falls in southeastern Venezuela is the highest uninterrupted waterfall in the world, dropping 979 m (3212 ft). Assume that it takes 14 s for the water to fall from the lip of the falls to the river below. If the water lands 55 m from the bas..
A stone is launched straight up by a slingshot. Its initial speed is 19.2 m/s and the stone is 1.40 m above the ground when launched. How high above the ground does the stone rise
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