The average density of the Sun is
a) less than the density of water.
b) greater than the density of water but less than the average density of Earth.
c) greater than the average density of Earth but less than the density of iron.
d) greater than the density of any known element found on Earth.
b
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A peregrine falcon dives at a pigeon. The falcon starts with zero downward velocity and falls with the acceleration of gravity. If the pigeon is 76.0 m below the initial height of the falcon, how long does it take the falcon to intercept the pigeon?
Q1 = 6.0 nC is at (0.30 m, 0); Q2 = -1.0 nC is at (0, 0.10 m); Q3 = 5.0 nC is at (0, 0). What is the direction of the net force on the 5.0 nC charge?
A) 34° above +x-axis B) 34° above -x-axis C) along the -x-axis D) 56° above +x-axis E) 56° above -x-axis
A batter applies an average force of 8000 N to a baseball for 1.1 ms. What is the magnitude of the impulse delivered to the baseball by the bat?
What will be an ideal response?
A wave travels in a string at 60 m/s. A second string of 40% greater linear density has the same tension applied as in the first string. What will be the resulting wave speed in the second string?
a. also 60 m/s c. 72 m/s b. 51 m/s d. 55 m/s