The disk of the galaxy is older than the halo
a. True
b. False
Indicate whether the statement is true or false
False
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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
On the scale of the cosmic calendar, in which the history of the universe is compressed into 1 year, how long is the average human life span?
A) 0.2 millisecond B) 0.2 second C) 2 seconds D) 2 minutes E) 2 hours
Rolling without slipping depends on static friction between the rolling object and the ground
Indicate whether the statement is true or false
A system has an increase in internal energy of 60 J while 90 J was removed from the system by heat. How much work was involved during this process and was it done on the system or done on its environment?
a. 30 J on the system c. 150 J on the system b. 30 J on the environment d. 150 J on the environment