Water pressure on a submerged object is greatest against its
A) top.
B) bottom.
C) sides.
D) same against all surfaces
E) none of the above
Answer: B
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Buoyancy: A 200-N object floats with three-fourths of its volume beneath the surface of the water. What is the buoyant force on the object? The density of water is 1000 kg/m3.
A. 50 N B. 150 N C. 200 N D. 267 N E. It cannot be determined because we do not know the volume of the object.
You run a 5000 watt clothes-dryer for 2 hours. How many kilowatt-hours of energy did you consume?
A) 2500 B) 2.5 C) 10 D) 0.4 E) Cannot be determined from the given information
An irreversible engine operating between the temperatures of 550 K and 300 K extracts 1.20 kJ of thermal energy from the hot reservoir and produces 0.450 kJ of work. How much entropy is created in the process?
A) 0.32 J/K B) 0.68 J/K C) 0.44 J/K D) 0.73 J/K E) 0 J/K
A 3.00-kg copper rod is 45.0 cm long at 24.8°C. If 45 000 J are transferred to the rod by heat, what is its change in length? ccopper = 387 J/kg/°C and ?copper = 17.0 × 10^?6/°C
a. 34.4 cm b. 0.0297 cm c. 0.133 cm d. 0.0445 cm e. More information is needed.