A container of water is lifted vertically 3.0 m, then returned to its original position. If the total weight is 30. N, how much work was done?
A) 0.18 kJ
B) 45 J
C) 90 J
D) No work was done.
E) 0.90 kJ
D
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A violin with string length 32 cm and string density 1.5 g/cm resonates with the first overtone from a 2.0-m long organ pipe with one end closed and the other end open. What is the tension in the string?
A) 1000 N B) 110 N C) 450 N D) 4100 N E) 56 N
What effect would powdering the solid have on the rate of dissolving the solid in a liquid?
A rock, released at rest from the top of a tower, hits the ground after 2.0 s. What is the speed of the rock as it hits the ground? (g = 9.8 m/s2 and air resistance is negligible)
a. 15 m/s c. 31 m/s b. 20 m/s d. 39 m/s