A 320-g air track cart traveling at 1.25 m/s collides elastically with a stationary 270-g cart. What is the speed of the 270-g cart after the collision?
A) 0.678 m/s
B) 0.106 m/s
C) 1.36 m/s
D) 1.14 m/s
E) 2.72 m/s
C
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The "zodiac" is ________.
A. a pink-colored glow above the horizon due to scattered sunlight B. a series of astrological signs C. a band of stars falling along the Celestial Equator D. a belt-shaped region of the sky surrounding the ecliptic E. a group of constellations through which the Sun passes on the equinoxes
A spaceship leaves Earth at 70.0% the speed of light. How fast must the spacecraft launch a shuttlecraft with respect to the ship so that it appears, from Earth, to be moving 98.7% the speed of light away
A) 0.928c B) 0.966c C) 0.987c D) 0.972c E) 0.911c
Which of the following does not travel at light speed?
A) light B) radio waves C) X-rays D) infrared waves E) Actually all of these travel at light speed.
What is the wavelength of the most intense light emitted by a giant star of surface temperature 5000 K? The constant in Wien's law is 0.00290 m ? K
A) 582 nm B) 580 nm C) 576 nm D) 578 nm