A concave spherical mirror with a radius of curvature of 20 cm creates a real image 30 cm from the mirror. How far is the object from the mirror?
A) 20 cm
B) 15 cm
C) 7.5 cm
D) 5.0 cm
B
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Which of the following statements about quantum tunneling is not true?
A) It is used in modern electronics and, in fact, our modern-day computers would not work without it. B) It plays a crucial role in nuclear fusion in the Sun. C) It allows electrons and other subatomic particles to pass through wall-like energy barriers even when it seems they do not have enough energy to get through the barriers. D) Although it has been observed to occur, it violates all other known laws of nature, and explaining it therefore represents a major challenge to physicists.
How did Eratosthenes estimate the size of Earth in 240 B.C.?
A) by observing the duration of a solar eclipse B) by measuring the size of Earth's shadow on the Moon in a lunar eclipse C) by comparing the maximum altitude of the Sun in two cities at different latitudes on the summer solstice D) by sending fleets of ships around Earth E) We don't know how he did it since all his writings were destroyed.
A car of mass 1 000 kg moves with a speed of 50 m/s on a circular track of radius 100 m. What is the magnitude of its angular momentum (in kg×m2/s) relative to the center of the race track?
a. 5.0 × 10^2 b. 5.0 × 10^6 c. 2.5 × 10^4 d. 2.5 × 10^6 e. 5.0 × 10^3
5.00 ?F, 10.0 ?F, and 50.0 ?F capacitors are connected in series across a 12.0-V battery. (a) How much charge is stored in the 5.00-?F capacitor? (b) What is the potential difference across the 10.0-?F capacitor?
What will be an ideal response?