A 0.3 - kg block of wood is floating in water. What is the magnitude of the buoy
ID: 1554100 • Letter: A
Question
A 0.3 - kg block of wood is floating in water. What is the magnitude of the buoyant force acting on the block? A. 2.9 N B. 32.7 N C. 9.5 N D. 9.8 N A manufacturer orders 1,000 kg of copper ingots. What volume does the copper occupy? Take the mass density of copper to be 8930 kg m^3. A. 9m^3. B. 8.9m^3. C. 1.12m^3 D. 0.11m^3. The water in the plumbing in a house is at a pressure of 3000 Pa. What force does this cause on top of the tank inside a water heater if the area of the top is 0.02 m^2? A. 600 N B. 6.000 N C. 60 N D. 15,000 N How much heat must be transferred to each kilogram of aluminum to bring it to its melting point of 660 degree C, from a temperature of 24 degree C ? The specific heat capacity for aluminum is 890 J/kg. degree C. A. 0.566 MJ B. 5.66 MJ C. 5.66 kJ D. 566 J Ethyl alcohol boils at 78 degree C. The Fahrenheit equivalent of this temperature is A. 78 degree F B. 140 degree F C. 172 degree F D. 351 degree FExplanation / Answer
1. Fb = m g = 0.3 x 9.8 = 2.9 N
Ans(A)
2. V =mass / density
= 1000 / (8930)
= 0.11 m^3
Ans(D)
3. F = P A = 3000 x 0.02 = 60 N
Ans(C)
4. Q = m c deltaT
= 1 x 890 x (660 - 24) = 566 x 10^3 J Or 0.566 MJ
Ans(A)
5. F = ( 9 x 78 / 5) + 32
= 172.4 deg F
Ans(C)
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