How are magnetic fields thought to affect star formation in molecular clouds?
A) They can help resist gravity, so that more total mass is needed before the cloud can collapse to form stars.
B) They accelerate the star formation process.
C) They allow small stars to form in isolation within gas clouds.
D) There are no magnetic fields in interstellar space, so there is no effect.
A) They can help resist gravity, so that more total mass is needed before the cloud can collapse to form stars.
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Why is the surface of Mercury more level (flatter) than the surface of the Moon?
A. Heat from the Sun made Mercury's surface softer and more malleable. B. The Moon formed out of the debris from a collision of two larger bodies. C. Mercury has stronger gravity and had a hotter interior. D. Tidal forces from Earth have pulled the Moon out of shape.
Ball A is dropped from the top of a building. One second later, ball B is dropped from the same building. Neglect air resistance. As time progresses, the difference in their speeds
A) increases. B) remains constant. C) decreases. D) cannot be determined from the information given.
Four unequal resistors are connected in a series circuit. Which one of the following statements is correct about this circuit?
A) The total resistance is equal to any one of the resistors. B) The total resistance is equal to average of the four resistors. C) The total resistance is less than the smallest resistor. D) The total resistance is less than the largest resistor. E) The total resistance is more than the largest resistor.
Two slits are illuminated with red light (l = 650 nm). The slits are 0.25 mm apart and the distance to the screen is 1.25 m. What fraction of the maximum intensity on the screen is the intensity measured at a distance 3.0 mm from the central maximum?
a. 0.94 b. 0.92 c. 0.96 d. 0.98 e. 0.99