A 7.5-kg otter slides down a hill, starting from rest at the top. The sloping surface of the hill is 8.8 m long,
and the top is 6.5 m above the base. If the speed of the otter at the bottom of the hill is 9.2 m/s, how much energy of the otter-Earth system was converted to internal energy?
160 J
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When solving conservation of energy problems
A. Work on the system is added to the initial energy side B. The change of thermal energy is zero if there is no friction or drag C. Work is zero if the system is isolated D. All of these are correct
What mass of 14C (having a half-life of 5730 years) do you need to provide a decay rate of 280.0 Bq? (1 u = 1.6605 × 10-27 kg)
A) 1.70 × 10-12 kg B) 5.38 × 10-19 kg C) 3.84 × 10-20 kg D) 8.68 × 10-13 kg
The weight of a 1-centimer cubed metal cube scaled up by a factor of 10 will be
A) ten times as much. B) a hundred times as much. C) a thousand times as much. D) none of the above
Which of the following is a unit conversion?
A) 10-9s B) 106W C) 1000 g D) 1 in = 2.54 cm E) 0.062 yd = 6.2 × 10-2 yd