What was significant in the design of the Apollo spacecraft?
What will be an ideal response?
It is difficult to get to the Moon, land, take off, and return to Earth all in one trip. The spaceship must carry food, water, and air for a number of days in space plus fuel and rockets for midcourse corrections, landing, and launch back to Earth. This adds up to a ship that is too massive to make a safe landing on the lunar surface. The solution was to take two spaceships to the Moon, one for the round-trip (the command module for long-term living and command center), and one to land in (small lunar landing module built for the short trip between the lunar surface and the command center).
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Because protostars are at a low temperature and surrounded by dust and gas, astronomers must observe them with ________.
A. ultraviolet telescopes B. gamma ray telescopes C. radar D. infrared and radio telescopes
The metamorphism of coal to anthracite occurs due to
A) high pressure and high temperature. B) high temperatures. C) contact metamorphism. D) crystallization of organic matter.
Moment of Inertia: The L-shaped object shown in the figure consists of three small masses connected by extremely light rods. Assume that the masses shown are accurate to three significant figures. What is the moment of inertia of this object (a) about the x-axis, and (b) about the y-axis?
What will be an ideal response?
A 2.5-kg object falls vertically downward in a viscous medium at a constant speed of 2.5 m/s. How much work is done by the force the viscous medium exerts on the object as it falls 80 cm?
A. +2.0 J B. +20 J C. ?2.0 J D. ?20 J E. +40 J