1.A hippo is dozing under water with only its small nostrils sticking out. It ha

Question

1.A hippo is dozing under water with only its small nostrils sticking out. It has a mass of 2100 kg and a volume of about 2.07 m3 after exhaling. How much force does it exert on the ground of the pool (fresh water, density 1g/cm3)?

NOTE: 20286 N is wrong.

2.What is the specific heat of a substance if a 46.1-g sample increases in temperature by 18.0°C when it absorbs 790.0 J of heat?

NOTE: 952.036 J/g/K is wrong

3.At least how many Calories does a mountain climber need to climb from sea level to the top of a 4.22 km tall peak assuming the muscles of the climber can convert chemical energy to mechanical energy with an efficiency of 14.0 percent. The total mass of the climber and the equipment is 78.6 kg. (Enter your answer as a number without units.)

NOTE: 5528200 is wrong, 1.08*10^5 is wrong

Explanation / Answer

given,

mass = 2100 kg

volume = 2.07 m^3

so,

same volume of water is displaced by the hippo

density = mass / volume

density of water = 1000 kg/m^3

1000 = mass / 2.07

mass = 2070 kg

net buoyant force = 2070 * 9.8

so net weight = (2100 - 2070) * 9.8

force does it exert on the ground of the pool = 294 N

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