Suppose you built a scale-model atom in which the nucleus was the size of a tennis ball. About how far would the cloud of electrons extend?
A) several centimeters
B) a few meters
C) a few tens of meters
D) several kilometers
E) to the Sun
D
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If a specially designed space probe reaches the event horizon of a black hole, an observer watching the clock on this probe from a safe distance would see
A) the clock slow down. B) the clock speed up. C) the clock keep time in sync with the observer's clock. D) the time on the clock would appear to change randomly.
A key component of one type of spectroscope for visible radiation is the
A) filter for separating the different gases. B) magnet for bending the radiation beam. C) electrostatic plate for bending and separating the radiation beam. D) prism for separating the radiation beam. E) mirror for separating the radiation beam.
The windings of a DC motor have a resistance of 6.00 ?. The motor operates on 120 V AC, and when running at full speed it generates a back emf of 105 V. What is the starting current of the motor?
A) 2.50 A B) 5.00 A C) 17.5 A D) 20.0 A E) 37.5 A
What is the order of star colors with increasing temperature?
a. Red, Yellow, Blue b. Blue, Red, Yellow c. Red, Blue, Yellow d. Yellow, Red, Blue e. Blue, Yellow, Red