The Sun is roughly 6 trillion miles (1 light year) away from Earth.
a. true
b. false
b. false
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Resistance and Resistivity: Copper wire #1 has a length L and a radius b. Copper wire #2 has a length 2L and a radius 2b. Which statement about the resistance across the ends of the wires is true?
A. The resistance of wire #1 is twice as high as that of wire #2. B. The resistance of wire #1 is equal to that of wire #2. C. The resistance of wire #1 is half that of wire #2. D. The resistance of wire #1 is four times higher than that of wire #2.
Slanting Surfaces Without Friction: A 15-kg block is on a frictionless ramp that is inclined at 20° above the horizontal. It is connected by a very light string over an ideal pulley at the top edge of the ramp to a hanging 19-kg block, as shown in the figure. The string pulls on the 15-kg block parallel to the surface of the ramp. Find the magnitude of the acceleration of the 19-kg block after the system is gently released?
A. 4.0 m/s2 B. 3.8 m/s2 C. 4.2 m/s2 D. 4.5 m/s2
Suppose that at a certain time a quanton has a well-defined position x = 0.15 nm. At that time, we perform an experiment to determine the quanton’s momentum, and find it has a value that corresponds to a de Broglie wavelength of 0.45 nm to a high degree of precision. What can we say about the quanton’s position after the experiment?
A. It is still 0.15 nm. B. It is now 0.45 nm. C. It is now within ±0.45 nm of 0.15 nm. D. It is now undefined but probably close to 0.15 nm. E. It is now completely undefined. F. Other (specify).
Why do single-dish radio telescopes have poor resolving power compared to optical telescopes of the same diameter?
What will be an ideal response?