Which sequence is correct when ordered by increasing size?
a. Earth, Solar System, Milky Way Galaxy, clusters of galaxies
b. Solar System, Earth, galaxy clusters, Milky Way Galaxy
c. Earth, Milky Way Galaxy, Solar System, galaxy clusters
d. Galaxy clusters, Solar System, Milky Way Galaxy, Earth
A
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One helpful development regarding the atmospheric ozone problem was the international agreement to
A) significantly reduce ozone production by year 2000. B) issue free sunglasses to everybody. C) significantly reduce CFC production by year 2000. D) reduce fossil fuel use by 50 percent by year 2000. E) produce more ozone and inject it into the stratosphere.
A hockey puck slides off the edge of a horizontal platform with an initial velocity of 28.0 m/s horizontally in a city where the acceleration due to gravity is 9.81 m/s2. The puck experiences no significant air resistance as it falls
The height of the platform above the ground is 2.00 m. What is the angle below the horizontal of the velocity of the puck just before it hits the ground? A) 77.2° B) 72.6° C) 12.8° D) 12.6° E) 31.8°
You push your 2 kg physics book along a tabletop, pushing it with 10 newtons of force. The frictional force on it is 4 newtons. The book's acceleration is
A) 2 m/s2. B) 5 m/s2. C) zero. D) 3 m/s2. E) 0.2 m/s2.
The binding energy of a nucleus is equal to
a. the energy needed to remove one of the nucleons. b. the average energy with which any nucleon is bound in the nucleus. c. the energy needed to separate all the nucleons from each other. d. the mass of the nucleus times c2.