"Physics" could best be described as the study of
A) atoms in motion.
B) matter.
C) the general principles underlying natural phenomena.
D) the application of science to the needs of human beings.
E) the absolute, or certain, truths about the natural world.
C
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Discuss the evidence we have that the surface of Venus is marked by volcanism
What will be an ideal response?
A car travels at 50.0 km/hr for 2.00 hours. It then travels an additional distance of 40.0 km in 1.00 hour. The average speed of the car for the entire trip is
A. 61.0 km/hr. B. 57.1 km/hr. C. 53.3 km/hr. D. 46.7 km/hr. E. 30.0 km/hr.
Compared to the planets in our own solar system, exoplanets have
A) a much narrow range of composition B) a much wider range of compositions C) an almost identical range of compositions D) completely different compositions
A spherical interplanetary grain of dust of radius 0.2 mm is at a distance r1 from the Sun. The gravitational force exerted by the Sun on the grain just balances the force due to radiation pressure from the Sun’s light. Suppose the grain is compressed so that it crystallizes into a sphere with significantly higher density, still at a distance r1. What is the net force exerted on the grain?
1.toward the Sun 2.away from the Sun 3.zero 4.impossible to determine without knowing the mass of the grain