Question

23. A 45 kg box is pushed 17:4 m up a frictionless plane at an angle of 370 above the horizontal. Calculate its increase in potential energy.

(a) 560 J (b) 2900 J (c) 1600 J (d) 3100 J (e) 4600 J

24. A rock is weighed in air and found to have a mass of 81:0 g. It is dropped into a beaker that was initially filled level full with water. If 22:3 cm3 of water overflow, what is the density of the rock?

    (a) 8.3 g/cm3 (b) 5.8 g/cm3 (c) 1.8 g/cm3 (d) 2.5 g/cm3 (e) 3.6 g/cm3

Answer 1