Rotational Dynamics: A small 355-g box hangs from one end of a thin light string that goes over a frictionless pulley having a moment of inertia of 0.0125 kg ? m2 and a radius of 15 cm. A second small package, this one of mass 680 g, hangs from the other end of the string. When the packages are released, the larger one accelerates downward, the lighter one accelerates upward, and the pulley turns without the string slipping.(a) What is the tension in the string on the side of the 355-g package?(b) At what rate do the packages change their speeds?
What will be an ideal response?
(a) 4.2 N (b) 2.0 m/s2
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A stone is moving on a rough level surface. It has 24 J of kinetic energy, and the friction force on it is a constant 0.50 N. What is the maximum distance it can slide?
A) 2.0 m B) 12 m C) 24 m D) 48 m
Find the final equilibrium temperature when 20.0 g of milk at 10.0°C is added to 160 g of coffee at 90.0°C. (Assume the specific heats of coffee and milk are the same as water and neglect the heat capacity of the container, and cwater = 1.00 cal/g•°C = 4186 J/kg•°C)
a. 85.3°C c. 71.4°C b. 81.1°C d. 66.7°C
When the distance between two charges is halved, the electric force between the charges
A) quadruples. B) doubles. C) is half. D) is reduced by one-quarter. E) none of the above
Increasing the diameter of a telescope I. increases its light-gathering power. II. increases its resolving power. III. increases it magnifying power. IV. increases its chromatic aberration
a. I, II, III, & IV b. I, II, & III c. I, II, & IV d. III & IV e. I & II