A slanted roof rises at 35° above the horizontal, and the straight-line distance from the top of the roof to the bottom edge is 4.5 m. The roof is covered with ice, so it offers no friction to objects sliding on it
A piece of ice at the top suddenly breaks loose and begins to slide down from rest. (a) How long will it take for the ice to reach the bottom edge of the roof? (b) How fast will the ice be traveling just as it reaches the bottom edge?
(a) 1.3 s (b) 7.1 m/s
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What was an early clue that radioactivity was a nuclear, and not an atomic, effect?
a. It works without visible light. b. It depended only on the amount of uranium, independent of its chemical form. c. It seemed to be related to X rays. d. It involved photon emission. e. It had the same effect as light in exposing photographic plates.
A long, straight wire (radius = 2.0 mm) carries a current of 2.0 A distributed uniformly over a cross section perpendicular to the axis of the wire. What is the magnitude of the magnetic field at a distance of 1.0 mm from the axis of the wire?
a. 0.40 mT b. 0.80 mT c. 0.10 mT d. 0.20 mT e. 0.75 mT
It is common to illustrate the density of nuclear matter be discussing the mass of a teaspoon of nuclear material. What do nuclear densities imply for the mass of a teaspoon (5 cm3) of nuclear material? You may wish to use the relationship r=(1.2 fm)A1/3 together with the mass of a proton, 1.67 x 10-27 kg, to estimate.
A. 3.8 x 1011 kg B. 9.6 x 1011 kg C. 1.53 x 1012 kg D. 1.15 x 1012 kg
The above figure is an example of a vector image.
Answer the following statement true (T) or false (F)