Which of the following paraphrases Hubble Law?
A) The faster the galaxy spins, the more massive and luminous it is.
B) The greater the distance to a galaxy, the greater its redshift.
C) The greater the distance to a galaxy, the fainter it is.
D) The more distant a galaxy is, the younger it appears.
E) The older the galaxy appears to us, the more luminous it is.
B
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A car of mass 1000 kg moves with a speed of 50 m/s on a circular track of radius 100 m. What is the magnitude of its angular momentum (in kg/m2/s) relative to the center of the race track?
a. 5.0 × 10^2 b. 5.0 × 10^6 c. 2.5 × 10^4 d. 2.5 × 10^6 e. 5.0 × 10^3
A baseball pitcher is employing a ballistic pendulum to determine the speed of his fastball. A lump of clay is suspended from a cord 2.0 m long
When the pitcher throws his fastball aimed directly at the clay, the ball suddenly becomes embedded in the clay and the two swing up to a maximum height of 0.080 m. If the mass of the baseball is 0.21 kg, find the speed of the pitched ball.
Somewhere between the Earth and the Moon is a point where the gravitational attraction of the Earth is canceled by the gravitational pull of the Moon. The mass of the Moon is 1/81 that of the Earth. How far from the center of the Earth is this point?
a. 8/9 the way to the Moon b. 9/10 the way to the Moon c. 3/4 the way to the Moon d. 80/81 the way to the Moon
The birthplaces of stars correspond to the ________ clouds in the interstellar medium
Fill in the blank(s) with correct word