You drop a stone down a well that is 9.50 m deep. How long is it before you hear the splash? The speed of sound in air is 343 m/s
A) 1.39 s
B) 1.40 s
C) 1.41 s
D) 1.42 s
E) 1.43 s
D
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By what length will a slab of concrete that is originally 18 m long contract when the temperature drops from 24°C to -16°C? The coefficient of linear thermal expansion for this concrete is 1.0 × 10-5 K-1
A) 0.50 cm B) 0.72 cm C) 1.2 cm D) 1.5 cm
The second law of thermodynamics states that
A) energy cannot be created or destroyed B) matter cannot be crated or destroyed C) the energy in a system undergoes changes that lead to increasing disorder D) the energy in a system undergoes changes that lead to increasing complexity
Which of the following could be the molecular formula for an alkane?
a. C7H7 b. C6H12 c. C5H9 d. C9H16 e. C3H8
The resistance of a conducting material depends on its composition, length, diameter, and temperature
Indicate whether the statement is true or false