Which fossil fuel produces the least carbon dioxide

a)natural gas

b)coal

c)nuclear energy

d)oil

Ababy stroller is a rest on top of a hill which is 10 m high. the stroller and baby have a mass of 20 kg. what is the potential energy of the baby and stroller?

Simple machines can a. increase force only b. decrease force only c. increase or decrease force

6–43 a food department is kept at 2128c by a refrigerator in an environment at 308c. the total heat gain to the food department is estimated to be 3300 kj/h and the heat rejection in the condenser is 4800 kj/h. determine the power input to the compressor, in kw and the cop of the refrigerator.