Every second, the Sun converts about 600 million tons of hydrogen into 596 million tons of helium. The remaining 4 million tons of mass is ________
A) converted to an amount of energy equal to 4 million tons times the speed of light squared
B) reabsorbed as molecular hydrogen
C) ejected into space in a solar wind
D) ejected into space by solar flares
A
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Spherical Mirrors: A convex spherical mirror has a focal length of magnitude 20 cm. If an object is placed 10 cm in front of the mirror on the mirror's axis, where is the image located?
A. 20 cm behind the mirror B. 20 cm in front of the mirror C. 6.7 cm behind the mirror D. 6.7 cm in front of the mirror
You are racing away from Earth in a super spaceship in which you can continually increase your speed. Which of the following best explains how people on Earth will perceive your speed?
A) They will know you are going very fast but will have no way of knowing whether you ever exceed the speed of light. B) You will see any beam of light from Earth coming toward you at the speed of light, which means it will catch you. Thus, the people on Earth must conclude that you are going slower than the speed of light. C) An imaginary spaceship can go as fast as it wants, so the folks on Earth soon will see you going faster than the speed of light. D) You may soon be racing away from Earth faster than the speed of light, but, if so, people on Earth will no longer be able to see you. E) Without more information, it is impossible to know how fast you would see a light beam from Earth coming toward you. If it happens that you are going fast enough so that the light can't catch you, then people on Earth would find you to be going faster than light.
What is the magnitude and direction of the gravitational force that acts on a person who weighs 500 N at Earth's surface?
What will be an ideal response?
A wire carries a steady current of 0.1 A over a period of 200 s. What total charge passes through the wire in this time interval?
a. 2 C c. 0.005 C b. 200 C d. 20 C