The first time period for which abundant fossils have been found is the
A) Precambrian.
B) Silurian.
C) Pliocene.
D) Cambrian.
Answer: D
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A 600-kg car is going over a curve with a radius of 120 m that is banked at an angle of 25° with a speed of 30.0 m/s. The coefficient of static friction between the car and the road is 0.30. What is the normal force exerted by the road on the car?
A) 1590 N B) 3430 N C) 3620 N D) 7240 N E) 5330 N
Based on the leading scientific theory of solar system formation, which of the following statements best explains why Uranus and Neptune have a significantly different composition than Jupiter and Saturn?
a. Jupiter and Saturn captured more gas from the solar nebula than Uranus and Neptune. b. The lower masses of Uranus and Neptune allowed more of their hydrogen and helium gas to escape into space. c. The lower temperatures at the locations of Uranus and Neptune allowed more material to condense into solid form. d. Jupiter and Saturn formed closer to the Sun, where there was more hydrogen and helium gas and
At what two celestial locations do the celestial equator and ecliptic coincide?
a. winter solstice and summer solstice b. vernal equinox and autumnal equinox c. they coincide at all points because they are the same. d. north celestial pole and south celestial pole e. zenith and east point
A small town has decided to forego the use of electrical power and send energy through town via mechanical waves on ropes
They use rope with a mass per length of 1.50 kg/m under 6000 N tension. If they are limited to a wave amplitude of 0.500 m, what must be the frequency of waves necessary to transmit power at the average rate of 2.00 kW? A) 24.8 Hz B) 169 Hz C) 60.0 Hz D) 2.07 Hz E) 2.00 kHz