During a snowball fight, two balls with masses of 0.4 and 0.6 kg, respectively, are thrown in such a manner that they meet head-on and combine to form a single mass. The magnitude of initial velocity for each is 20 m/s. What is the speed of the 1.0-kg mass immediately after collision?
a. zero
c. 4 m/s
b. 3 m/s
d. 5 m/s
C
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An airplane is pointed in the NE direction and is moving 71. m/s with respect to the air. The jetstream (moving air) carries the plane 30. m/s toward the East. What is the velocity of the plane relative to the ground?
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You discover that a nearby star, very similar to the Sun, has a velocity curve that has a period of 6 months, induced by the orbit of a planet. You infer that
A) the planet's orbit radius is greater than 1 AU. B) the planet's orbit radius is less than 1 AU. C) the planet's orbit radius cannot be determined based on the information provided. D) the planet's orbit radius is about 1 AU.
Terrestrial planets, like Earth, are made up of rock and metal
a. True b. False Indicate whether the statement is true or false
The reason why ancient astronomers thought that Earth could not be moving was because stars lacked any measurable parallax beyond one degree
a. True b. False Indicate whether the statement is true or false