Which of the following statements about stellar parallax is true?
A) The closer a star is to us, the more parallax it exhibits.
B) It takes at least 10 years of observation to measure a star's parallax.
C) The amount of parallax we see depends on how fast a star is moving relative to us.
D) Stellar parallax was first observed by ancient Greek astronomers.
E) We observe all stars to exhibit at least a slight amount of parallax.
A
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A 4.0-kg mass, initially at rest on a horizontal frictionless surface, is struck by a 2.0-kg mass moving along the x axis with a speed of 8.0 m/s. After the collision, the 2.0-kg mass has a speed of 4.0 m/s at an angle of 37° from the positive x axis. What is the speed of the 4.0-kg mass after the collision?
a. 2.0 m/s b. 2.7 m/s c. 4.9 m/s d. 2.4 m/s e. 3.6 m/s
When a car of mass 1167kg accelerates from 10.0 m/s to some final speed, 4.00 × 105 J of work are done. Find this final speed
A) 30.8 m/s B) 22.4 m/s C) 28.0 m/s D) 25.2 m/s
A key step in the destruction of ozone by chlorofluorocarbons is
A) the chlorofluorocarbon molecule separates, resulting in free carbon which produces a greenhouse effect. B) the chlorofluorocarbon molecule directly combines with atmospheric ozone. C) carbon atoms react with ozone. D) radiation from the sun separates chlorofluorocarbon, resulting in free chlorine. E) radiation from the sun breaks down O3 molecules.
In an X-ray diffraction experiment using X-rays of l = 0.500 × 10^-10 m, a first-order maximum occurred at 5.00°. Find the crystal plane spacing
a. 2.87 × 10^-10 m b. 1.36 × 10^-10 m c. 6.24 × 10^-9 m d. 1.93 × 10^-9 m e. 5.74 × 10^-9 m