Uniform Circular Motion: A small 175-g ball on the end of a light string is revolving uniformly on a frictionless surface in a horizontal circle of diameter 1.0 m. The ball makes 2.0 revolutions every 1.0 s.(a) What are the magnitude and direction of the acceleration of the ball?(b) Find the tension in the string.
What will be an ideal response?
(a) 79.0 m/s2 toward the center of the circle (b) 13.8 N
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Where do scientists find the key evidence linking the extinction of the dinosaurs to the impact of an asteroid or comet?
A. in sediments that surround a large crater in Mexico B. in sediments separating rocks from the time when dinosaurs existed from those deposited after dinosaurs were no longer found C. in rock brought up by drilling deep into Earth's mantle D. in sediments found on the ocean bottom near mid-ocean ridges E. in rocks returned from craters on the Moon
Which of these is a likely source of strong gravity waves?
a. The Earth. b. The Sun. c. A supernova. d. Nuclear fission. e. Nuclear fusion in stars.
What chemical compound is responsible for Uranus and Neptune's color?
A. water B. methane C. complex organic compounds of sulfur and phosphorus D. ammonia
The surface of Venus is much hotter than the Earth because it
A) has no magnetic field B) has a very thick atmosphere of carbon dioxide C) has a much higher rate of volcanic activity D) is closer to the Sun