About what percentage of the mass of the solar nebula consisted of elements other than hydrogen and helium?
A) 0 percent
B) 0.1 percent
C) 2 percent
D) 20 percent
E) 80 percent
C) 2 percent
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Which of the following best describes a website's visual identity?
A. An assurance or guarantee that a business offers its customers. B. The placement of objects on a webpage. C. The combination of design elements associated with the website and its publisher. D. A concise statement that a consumer readily associates with a business.
How should we expect the Milky Way's interstellar medium to be different in 50 billion years than it is today?
A) The total amount of gas will be much less than it is today. B) The total amount of gas will be about the same, but the percentage of elements heavier than hydrogen and helium will have risen from the current 2% to more than 50%. C) The total amount of gas will be much greater because many stars will undergo supernovae between now and then. D) Thanks to the recycling of the star-gas-star cycle, the interstellar medium should look about the same in 50 billion years as it does today.
An 80-g particle moving with an initial speed of 50 m/s in the positive x direction strikes and sticks to a 60-g particle moving 50 m/s in the positive y direction. How much kinetic energy is lost in this collision?
A. 96 J B. 89 J C. 175 J D. 86 J E. 110 J
An 825-kg space vehicle is circling Earth in a circular orbit with a radius of 10,300 km
Its orbit is to be changed to a larger circle with a radius of 17,400 km. How much energy is required to accomplish this? The mass of Earth is 5.97 × 1024 kg and G = 6.67 x 10-11 N•m2/kg2. A) 1.00 × 109 J B) 1.30 × 1010 J C) 6.51 × 109 J D) 4.45 × 109 J E) 4.50 × 1010 J