Ice has a latent heat of fusion of 80 kcal/kg. How much heat is required to melt 200 g of ice?
A) 400 J
B) 160 J
C) 67 kJ
D) 32 kJ
E) 16 kJ
C
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Suppose that an object travels from one point in space to another. Make a comparison between the magnitude of the displacement and the distance traveled by this object
A) The displacement is either greater than or equal to the distance traveled. B) The displacement is always equal to the distance traveled. C) The displacement is either less than or equal to the distance traveled. D) The displacement can be either greater than, smaller than, or equal to the distance traveled.
A carnival Ferris wheel has a 15-m radius and completes five turns about its horizontal axis every minute. What is the acceleration of a passenger at his lowest point during the ride?
a. 5.7 m/s2 downward b. 4.1 m/s2 upward c. 14 m/s2 downward d. 4.1 m/s2 downward e. 19 m/s2 downward
The conservation of momentum is most closely related to Newton's
A) first law. B) second law. C) third law.
The electrical conductivity of copper and nickel material at room temperature are 6.0×107 (??m)-1 and 2.0×107 (??m)-1 , respectively. Copper and nickel form a solid solution at low concentrations at room temperature. If an alloy of nickel plus 5 atom % copper produced from these materials has an electrical resistivity of 11×10-8 ??m, what would be the electrical resistivity of an alloy of nickel plus 10-atomicpercent copper? You may assume that these are dilute solutions.
What will be an ideal response?