Which of the following best describes stars in the halo of our Galaxy?
A) young, red, and dim with low abundance of heavy elements
B) young, blue, and bright with high abundance of heavy elements
C) old, red, and dim with low abundance heavy elements
D) old, red, and dim with high abundance of heavy elements
E) old, red, and bright with low abundance of heavy elements
C) old, red, and dim with low abundance heavy elements
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Energy Conservation With Conservative Forces: A girl throws a stone from a bridge. Consider the following ways she might throw the stone. The speed of the stone as it leaves her hand is the same in each case.
In which case will the speed of the stone be greatest when it hits the water below if there is no significant air resistance?
A. Case A B. Case B C. Case C D. Case D E. The speed will be the same in all cases.
A person pushes on a doorknob with a force of 5.00 N. The direction of the force is at an angle of 20.0° from the perpendicular to the surface of the door. The doorknob is located 0.800 m from axis of the hinges of the door
The door begins to rotate with an angular acceleration of 2.00 rad/s2. What is the moment of inertia of the door about the hinges? A) 4.28 kg?m2 B) 7.52 kg?m2 C) 1.88 kg?m2 D) 0.684 kg?m2 E) 2.74 kg?m2
The flow patterns found on the surface of Mars and the number of craters on top of them suggest that
a. Mars is today a liquid water-rich world. b. the climate on Mars was different billions of years ago. c. volcanism is occurring on Mars. d. the polar caps are made of liquid water. e. all of the above
Electricity from a AAA battery costs the consumer about
A. 1 ¢ per kilowatt-hour B. 10¢ per kilowatt-hour C. $1 per kilowatt-hour D. $1000 per kilowatt-hour