The Earth's escape velocity is defined to be the
A) minimum orbital speed for the Moon to escape from the Earth's gravity
B) minimum orbital speed for the Earth to escape from the Sun's gravity
C) minimum velocity required for an object to escape the Earth's gravity
D) velocity that objects are pulled toward the Earth's surface by gravity
C
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Rotational Kinetic Energy: A solid uniform ball with a mass of 125 g is rolling without slipping along the horizontal surface of a table with a speed of 4.5 m/s when it rolls off the edge and falls towards the floor, 1.1 m below. What is the rotational kinetic energy of the ball just before it hits the floor?
A. 0.51 J B. 0.73 J C. 1.1 J D. 2.6 J E. This question cannot be answered without knowing the radius of the ball.
What year did people on Earth see the Crab Nebula explode?
A.) 1993. B.) 1877. C.) 1054. D.) 108 B.C. E.) Around 2,300 B.C.
For a system in simple harmonic motion, which of the following is the number of cycles or vibrations per unit of time?
a. amplitude maximum b. period c. frequency d. wavelength
The first self-replicating molecule was probably
A) a simple carbohydrate B) DNA C) a simple protein D) RNA