A crane lifts a steel submarine of density 7800 kg/m3 and mass 20,000 kg
What is the tension force that the lifting cable exerts on the submarine (a) when the submarine is submerged in water of density 1000 kg/m3, and (b) when it is entirely out of the water? A) (a) 2.0 × 105 N (b) 1.7 × 105 N
B) (a) 1.7 × 105 N (b) 2.0 × 105 N
C) (a) 2.6 × 103 N (b) 2.0 × 105 N
D) (a) 2.0 × 105 N (b) 2.6 × 103 N
B
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A) It comes from the foods you eat. B) It is produced from the radiative energy of the Sun on your skin. C) It is created during the time that you rest or sleep. D) It comes from the water you drink. E) It is in the air that you breathe.
A chunk of ice (T = -20°C) is added to a thermally insulated container of cold water (T = 0°C). What happens in the container?
A) The ice melts until thermal equilibrium is established. B) The water cools down until thermal equilibrium is established. C) Some of the water freezes and the chunk of ice gets larger. D) None of the above things happen.
As you are moving very quickly toward a speaker emitting a pure tone, which characteristics of the sound get larger? (There may be more than one correct choice.)
A) frequency B) amplitude C) wavelength D) period E) loudness
Answer the following statement(s) true (T) or false (F)
If we shine white light through two slits onto a distant screen, we will see a clear interference pattern.