A 310-g air track cart is traveling at 1.25 m/s and a 260-g cart traveling in the opposite direction at 1.33 m/s. What is the speed of the center of mass of the two carts?
A) 1.47 m/s B) 1.29 m/s C) 0.131 m/s D) 0.0732 m/s E) 2.80 m/s
D
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The primary way that we observe the atomic hydrogen that makes up most of the interstellar gas in the Milky Way is with
A) radio telescopes observing at a wavelength of 21 centimeters. B) ground-based visible-light telescopes. C) space-based ultraviolet telescopes. D) x-ray telescopes.
A spring (k = 600 N/m) is placed in a vertical position with its lower end supported by a horizontal surface. A 2.0-kg block that is initially 0.40 m above the upper end of the spring is dropped from rest onto the spring. What is the kinetic energy of the block at the instant it has fallen 0.50 m (compressing the spring 0.10 m)?
a. 5.3 J b. 6.8 J c. 6.3 J d. 5.8 J e. 6.5 J
Four point charges are on the rim of a circle of radius 10 cm. The charges are (in ?C) +0.50, +1.5, ?1.0, ?0.50 . If the electrical potential at the circle's center due to the +0.5 charge alone is 4.5 × 10^4 V, what is the total potential at the center due to the four charges combined?
a. 18 × 10^4 V b. 4.5 × 10^4 V c. zero d. ?4.5 × 10^4 V
Some light switches that glow in the dark after the lights are turned off employ
A) fluorescence. B) resonance. C) incandescence. D) all of the above E) none of the above