An astronaut floating alone in outer space throws a baseball. If the ball moves away at 20 m/s, the astronaut will move in the opposite direction at
A) 20 m/s.
B) a lower speed.
C) a higher speed.
D) more information needed
E) none of the above
Answer: B
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Equation of Traveling Waves: The vertical displacement y(x,t) of a horizontal string aligned along the x-axis is given by the equation y(x,t) = (6.00 mm) cos[(3.25 m-1)x - (7.22 s-1)t]. What are the (a) speed and (b) amplitude of this wave?
What will be an ideal response?
The center of mass of a system of particles (or objects) with total mass M moves like a single particle of mass M acted upon by the same net external force
Indicate whether the statement is true or false
What is meant by "the heat death of the universe"?
A) The universe will end in a giant inferno. B) The universe will reach thermal equilibrium. C) Some day the sun will explode and we will all burn. D) Some day the sun will cease to provide electromagnetic radiation. E) The radiation from the stars will continuously heat up the universe.
Two bodies with masses m1 and m2 are both moving east with velocities of magnitudes v1 and v2, where v1 is less than v2 . The magnitude of the velocity of the center of mass of this system of two bodies is
a. less than v1. b. equal to v1. c. equal to the average of v1 and v2. d. greater than v1 and less than v2. e. greater than v2.