please help thanks?
Physics questions .. please help ..? 1. The English unit for power is horsepower. the reason for the choice to mean the horse is power. a) runs very fast. b) is the beast of burden of man from time immemorial c) is strong and feeds only on grass d) is very brave and can be used in the war 2. A 55.0kg weightlifter can lift twice his weight to 2.0 m in 2.0s. its output power is? a) 1.0hp b) 1.4hp c) 39.2J d) 539J 3. A mountain climber 65 kg backpack load of 10 kg has an average power of 50W, which can climb a height of 1.37 km in a 1.0hr b)) 6.0hrs c) 1 day d) 2 days 4. A 450 gram hammer strikes a nail head at a speed of 12.0m / s and 2.0cm units on a wooden board. the average force on the nail is a) 4.41N b) 32.40N c) 1620N d) 4410N thanks .. and can anyone please give me an idea of the calculations and the conversion of power to watts and joules to newtons ..
1. Remember that when James Watt put the 'power' the horse was a driving force standard. 10197.2gm/cm joules = 1 watt / sec = 1 newton dyne = 0.0010197gm. Horses force = 746Joules/sec. Now do the arithmetic.
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