The planet with the polar "ice caps" of frozen carbon dioxide is ______________
Fill in the blank(s) with correct word
Mars
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Projectile Motion: A child is trying to throw a ball over a fence. She gives the ball an initial speed of 8.0 m/s at an angle of 40° above the horizontal. The ball leaves her hand 1.0 m above the ground and the fence is 2.0 m high. The ball just clears the fence while still traveling upwards and experiences no significant air resistance. How far is the child from the fence?
A. 0.73 m B. 1.6 m C. 2.7 m D. 3.8 m E. 7.5 m
Is there any actual evidence that our solar system originate from a collapsing cloud of gas, as described in the textbook?
A) Evidence comes from observations of Earth's oldest rocks. B) Evidence comes from observations of gas clouds around new stars elsewhere in our galaxy. C) Evidence comes from observations of the moon, meteorites, other planets, and other moons. D) All of the above. E) No, this description is based only on the theory of gravity and other theories.
During a very cold winter, water pipes sometimes burst because
A) the ground contracts when colder, pulling pipes apart. B) water expands when freezing. C) water contracts when freezing. D) the thawing process produces pressure on the pipes. E) none of the above
Two children, Ahmed and Jacques, ride on a merry-go-round. Ahmed is at a greater distance from the axis of rotation than Jacques. Which of the following are true statements? (There could be more than one correct choice.)
A) Jacques has a greater angular speed than Ahmed. B) Jacques and Ahmed have the same angular speed. C) Jacques has a smaller angular speed than Ahmed. D) Ahmed has a greater tangential speed than Jacques. E) Jacques and Ahmed have the same tangential speed.