Today, global average temperatures are estimated using
A) orbiting satellites
B) weather stations
C) water temperature measurements by ships
D) all of these
D
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The Schwarzschild radius of a 1-Mo black hole is approximately
a. 3 km. b. 1,500,000 km, the size of the Sun. c. 150,000,000 km or 1 AU. d. 3 × 10^13 km or 1 pc.
What type of dunes exist on Titan?
A. dust dunes B. sand dunes C. ice crystal dunes D. We have not discovered any dunes on Titan.
To maximize the magnification of a refracting telescope, what lenses should you choose?
A) The objective lens should have a small focal length and the eyepiece should have a large focal length. B) The objective lens and eyepiece should both have large focal lengths. C) The objective lens and eyepiece should both have small focal lengths. D) The objective lens should have a large focal length, but it doesn't matter what the focal length of the eyepiece is. E) The objective lens should have a large focal length and the eyepiece should have a small focal length.
A 1.6-kg ball is attached to the end of a 0.40-m string to form a pendulum. This pendulum is released from rest with the string horizontal. At the lowest point of its swing, when it is moving horizontally, the ball collides with a 0.80-kg block initially at rest on a horizontal frictionless surface. The speed of the block just after the collision is 3.0 m/s. What is the speed of the ball just after the collision?
A. 1.7 m/s B. 1.1 m/s C. 1.5 m/s D. 1.3 m/s E. 2.1 m/s