An aluminum wire and a steel wire, each of length 2.0 m, are hung from the ceiling. A 5.0-kg mass is suspended from the lower end of each wire. The aluminum wire has a diameter of 2.2 mm
What must be the diameter of the steel wire if it is to stretch the same distance as the aluminum wire, so that the two wires maintain equal lengths after the masses are attached? Young's modulus for aluminum is 0.70 × 1011 Pa and for steel it is 2.0 × 1011 Pa.
1.3 mm
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The phase angle in a series RL circuit at 1.0 kHz with a 0.20-k? resistor and a certain inductor is 40°. What is the inductance in this circuit?
A) 27 mH B) 37 mH C) 58 mH D) 84 mH E) 74 mH
What factor caused different planets to form out of different types of material?
A) The angular momentum of the forming planet; faster rotating planets lost the lightest elements. B) The quantity of dust particles in the solar nebula; more dust caused some planets to contain heavier elements. C) The variation in temperature throughout the solar nebula; the higher the temperature, the lower the percentage of light elements in the forming planet. D) The angular momentum of the solar nebula pushed the heavy elements towards the outer regions of the nebula. E) The innate variation of chemical composition of the original nebula; the outer parts of the nebula contained a greater abundance of heavy elements.
Two spaceships traveling in opposite directions along parallel lines measure their own and the other spaceship's length while passing one another. The crew on spaceship A says that their ship is 1000 m long and that ship B is 800 m long. The crew on ship B says that their ship is 1000 m long and that ship A is 800 m long. At what speed does each crew say that the other ship is traveling relative
to their own ship? a. 0.36 c b. 0.60 c c. 0.64 c d. 0.80 c e. 1.25 c
A 3.50 kg block is pulled along a moving conveyor belt at a constant speed of 0.500 m/s relative to a stationary observer while the belt moves at a constant speed of 0.200 m/s in the opposite direction. If the coefficient of kinetic friction is 0.400, the magnitude of the mechanical energy dissipated, in J, caused by the force of friction on the block in 8.00 s is
a. 5.6. b. 22.0. c. 32.9. d. 54.8. e. 76.8.