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(1) A small piece of rock is weighed in air and then weighed while immersed in oil of density 800 kg/m3. If the weight in air is 21.5 N and the weight in the oil is 11.8 N, calculate the density of the rock.
(2) A 15 meter length of steel with a cross-sectional area of 20 cm2 is compressed with a force of 10,000 N. If theYoung's modulus of steel is 200 *10^9 N/m2, what is the change in length of the steel beam?
A block of mass 2.0 kg is pushed against a vertical wall by a horizontal push (P) of 50.0 N. The block does NOT move. Assuming that the coefficient of the static friction, k
A 23kg child eats a candy bar containing 230 kcal of chemical energy. If the conversion to mechanical energy was 100% efficient (and it isn't), how high a hill (in meters) c
A circular swimming pool has a diameter of 12 m, the sides are 4 m high, and the depth of the water is 3 m. How much work (in Joules) is required to pump all of the water over
A single slit, which is 0.050 mm wide, is illuminated with light of 550 nm wavelength. What is the angular separation among the first two minima on either side of the central
A recording engineer works in a soundproofed room that is 45 dB quieter than the outside. If the sound intensity in the room is 1.30 x10-10 W/m2, what is the intensity outsi
The soccer goal is 21.78 m in front of a soccer player. She kicks the ball giving it a speed of 18.69 m/s at an angle of 25.43 degrees from the horizontal. find the speed of
An electron is observed traveling at a speed of 1.89 107 m/s parallel to an electric field of magnitude 10,660 N/C. How far will the electron travel before coming to a stop? (
Kras, Inc., was organized and authorized to issue 50,000 shares of $100 par value, 9 percent [referred stock and 50,000 a shares of no-par, $5 stated value common stock on J
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