What is a meteoroid?
A. a space rock that survives its fall through Earth's atmosphere and reaches the ground
B. any one of the large rocky bodies that orbit the Sun, primarily between Jupiter and Saturn
C. a glowing trail of hot gas and debris heated by friction as an object moves through the atmosphere
D. the object that causes a "shooting star," but before it passes through the atmosphere
Answer: D
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A freight train consists of an engine and several identical cars on a level track. Which of the following statements is true?
A. if the train is moving at constant speed, the engine must be pulling with a force greater than the train's weight B. if the train is moving at constant speed, the engine's pull on the first car must exceed that car's backward pull on the engine C. if the train is coasting, its inertia makes it slow down and eventually stop D. if the train is moving at constant speed the engine's pull must be equal to the friction
Earth satellites are typically more than 100-km high so as to mainly be above the Earth's
A) atmosphere. B) gravitational influence. C) both of these D) none of the above
You are riding in a spaceship that has no windows, radios, or other means for you to observe or measure what is outside. You wish to determine if the ship is stopped or moving at constant velocity. How can you do this?
A) You can determine if the ship is moving by determining the apparent velocity of light in the spaceship. B) You can determine if the ship is moving by checking your precision time piece. If it's running slow, the ship is moving. C) You can determine if the ship is moving by lying down and measuring your height. If you are shorter than usual, the ship is moving. D) You should give up because you have taken on an impossible task!
The Big Dipper is an officially recognized constellation
Indicate whether the statement is true or false