The closest object that a typical young person with normal vision can focus on clearly is closest to
A) 1 cm.
B) 10 cm.
C) 25 cm.
D) 50 cm.
E) 75 cm.
C
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What important role does the ozone layer play in Earth's atmosphere? a. The ozone layer absorbs ultraviolet photons
b. The ozone layer traps in infared radiation. c. The ozone layer produces water vapor. d. The ozone layer traps in UV radiation. e. The ozone layer produces the oxygen needed for life.
Specific Heat: A machine part consists of 0.10 kg of iron (of specific heat 470 J/kg ? K ) and 0.16 kg of copper (of specific heat 390 J/kg ? K). How much heat must be added to the gear to raise its temperature from 18°C to 53°C?
A. 910 J B. 3800 J C. 4000 J D. 4400 J
Length Contraction: You are a passenger on a spaceship. As the speed of the spaceship increases, you will observe
A. the length of your spaceship getting shorter. B. the length of your spaceship getting longer. C. the length of your spaceship is zero. D. no change in the length of your spaceship.
The magnetic field in a superconducting solenoid is 3.0 T. How much energy per unit volume is stored in the solenoid, in J/m3? ?0 = 4?× 10?7 T ? A/m
What will be an ideal response?