Which of the following are not found on Venus?
a. volcanoes
b. coronae
c. rolling plains
d. lobate scarps
e. high atmospheric pressure
d
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A 60 kg boy standing on a skateboard with frictionless wheels and negligible mass throws a 3 kg ball straight up with a speed of 4 m/s. If the boy was at rest before the throw, his speed after the throw will be ________.
Fill in the blank(s) with the appropriate word(s).
The redshift of the galaxies is correctly interpreted as
A) the differences in temperatures and star formation in old and young galaxies. B) a Doppler shift due to the random motions of galaxies in space. C) an aging of light as gravity weakens with time. D) space itself is expanding with time, so the photons are stretched while they travel through space. E) placing our Galaxy near the center of the Local Group.
A 0.60-kg object is suspended from the ceiling at the end of a 2.0-m string. When pulled to the side and released, it has a speed of 4.0 m/s at the lowest point of its path. What maximum angle does the string make with the vertical as the object swings up?
a. 61° b. 54° c. 69° d. 77° e. 47°
Wave 1 has amplitude of 9.0 units and wave 2 has amplitude 4.0 units. What is the ratio of their intensities, I1/I2?
A. 20 B. 5.1 C. 2.3 D. 1.5 E. 1.3