A rocket is traveling away from Earth at 90% the speed of light. The captain turns on a laser light
What is the speed of the light as measured by an Earth-based astronomer if the captain aims the laser (a) directly forward or (b) directly backward?
(a) c = 3.00 × 108 m/s (b) c = 3.00 × 108 m/s
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Reptiles evolved from amphibians about
A) 475 million years ago B) 542 million years ago C) 360 million years ago D) 245 million years ago
Which statement is incorrect? The gravitational force on an orbiting satellite due to the Earth
a. aims toward the center of the Earth. b. depends on the Earth's mass. c. depends on the satellite's mass. d. depends on the distance between the Earth and the satellite. e. none of the above
If a meter stick is metallic and is used for measuring lengths at room temperature, what will be the effect of using the same meter stick for measuring lengths outside on a snowy day?
1.There will be no effect. The lengths measured outside would be the same as those measured inside. 2.The lengths measured outside would be slightly less than those measured inside. 3.The lengths measured outside would be slightly greater than those measured inside. 4.It is impossible to tell. It depends on what type of metal the meter stick is composed of.
Provides online astronomical info, such as sunrise and sunset times