Due to the dust in the interstellar medium, a distant star will appear to an observer on Earth to be
a. brighter and cooler than it really is.
b. brighter and hotter than it really is.
c. fainter and cooler than it really is.
d. fainter and hotter than it really is.
e. unchanged in brightness or apparent color.
C
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Conservation of Momentum: A dinner plate falls vertically to the floor and breaks up into three pieces, which slide horizontally along the floor. Immediately after the impact, a 320-g piece moves along the +x-axis with a speed of 2.00 m/s and a 355-g piece moves along the +y-axis with a speed of 1.50 m/s. The third piece has a mass of 100 g. In what direction relative to the +x-axis does the third piece move?
A. 216.9° from the +x-axis B. 219.8° from the +x-axis C. 36.9° from the +x-axis D. 39.9° from the +x-axis E. 39.8° from the +x-axis
________ provides experimental evidence that the Universe is expanding.
A. Dark matter B. Hubble's law C. The Big Bang model D. The cosmological constant
Suppose Spider-Man throws a web that is 1.00 m long with a velocity of 0.8c (? = 5/3) with respect to the Earth. What will be the length of web as observed by J. Jonah Jameson standing on the Earth?
A. 0.80 m B. 1.67 m C. 1.33 m D. 0.60 m E. 1.00 m
Four point charges are on the rim of a circle. The charges are (in mC) +0.50, +3.0, -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 c. zero b. 4.5 × 10^4 V d. -4.5 × 10^4 V