A runner in a race takes 2.7 seconds to go from the 40 meter mark to the 70-meter mark. (a) What is the runner's speed? (b) How far would the runner go in 8 seconds if this speed is maintained? (c) How long did it take the runner to cover the first 40 m (assuming the same speed was maintained)?
11.1 m/s, 89 m, 3.6 s
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Nuclear power plants on Earth create energy in the same way as the Sun
Indicate whether the statement is true or false
Which is true of the troposphere on Earth?
A) It is the lowest layer in the atmosphere, in which convection occurs. B) It is the region of the atmosphere that absorbs ultraviolet light from the Sun. C) It is the region of the atmosphere that absorbs x-rays from the Sun. D) It is the highest layer in the atmosphere, marking the boundary with space.
Astronomers have determined that the gas giants are made mostly of hydrogen and helium. Given what you have learned about planetesimal formation through accretion, and the types of materials that condensed at certain distances from the Sun, which of the following is the most likely way that the gas giants formed?
A. Because hydrogen and helium could not condense into a solid at the temperature of the Solar Nebula, the gas giants must have formed elsewhere and been captured by the Sun's gravity. B. Hydrogen and helium condensed into a solid and accreted to form the gas giants. C. Rock, metal, and ices made of materials such as water, ammonia, and methane, condensed into a solid and grew large enough to gravitationally attract hydrogen and helium gas from the Solar Nebula.
An astronaut on a strange new planet having no atmosphere finds that she can jump up to a maximum height of 27 m when her initial upward speed is 6.0 m/s. What is the magnitude of the acceleration of freely falling objects on the planet?
What will be an ideal response?