A car travels in a due northerly direction at a speed of 55 km/h. The traces of rain on the side windows of the car make an angle of 60 degrees with respect to the horizontal. If the rain is falling vertically with respect to the earth, what is the speed of the rain with respect to the earth?
a. 48 km/h
b. 95 km/h
c. 58 km/h
d. 32 km/h
e. 80 km/h
b
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Einstein's mass-energy equivalence () is important to the first phases of the big bang in explaining how____
a. gamma ray photons create matter and antimatter b. stable protons and neutrons can exist below a certain temperature c. antimatter can exist d. matter became more prevalent than antimatter e. the Universe expanded rapidly
A 2.00 kg mass is located at (4.00 m, 0.00 m, 0.00 m) and a 4.00 kg mass is located at (0.00 m, 3.00 m, 0.00 m). The center of gravity of the system of masses is
A. (1.33 m, 2.00 m, 0). B. (1.33 m, 1.00 m, 0). C. (1.50 m, 1.33 m, 0). D. (2.00 m, 1.33 m, 0). E. (1.33 m, 1.50 m, 0).
Free Fall: A rock is thrown directly upward from the edge of a flat roof of a building that is 56.3 meters tall. The rock misses the building on its way down, and is observed to strike the ground 4.00 seconds after being thrown. Take the acceleration due to gravity to have magnitude 9.80 m/s2 and neglect any effects of air resistance. With what speed was the rock thrown?
Fill in the blank(s) with the appropriate word(s).
A planetary nebula is
a. the expelled outer atmosphere of a medium-mass star. b. produced by a supernova explosion. c. produced by a nova explosion. d. a nebula within which planets are forming. e. a cloud of hot gas surrounding a planet.