Which of the following is believed to have caused the extinction of the dinosaurs on Earth?
a. An asteroid
b. A meteoroid
c. A comet
d. Interplanetary dust
a
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Inside a freely-falling elevator your
A) acceleration is zero. B) weight is zero. C) gravitational interaction with Earth is zero. D) all the above E) none of the above
A future news release might report that a new planet has been found around a star very similar to our sun. This newly discovered planet is claimed to have a mass 40 times that of Earth and is located nearly 25 AU from the star it orbits. Which of the following would be a reasonable prediction about this planet? I. The planet will probably have a mean density of around 5 g/cm3. II. The planet will
probably have a radius of around five to ten times greater than Earth's. III. The planet will probably have several satellites. IV. The planet will probably have a composition that is mostly hydrogen and helium. a. I & IV b. I, II, & III c. II, III, & IV d. I, II, & IV e. I, II, III, & IV
Arno Penzias and Robert Wilson are famous for____
a. creating the first microwave telescope b. finding the direction of the center of the Universe c. detecting energy released in the splitting of the electroweak force d. detecting the large redshift background radiation from the big bang e. measuring the temperature of the big bang
Buoyancy: A 4.0-kg cylinder of solid iron is supported by a string while submerged in water. What is the tension in the string? The density of iron is 7860 kg/m3 and that of water is 1000 kg/m3.
A. 2.5 N B. 20 N C. 24 N D. 34 N E. 40 N