How much energy in joules does it take to raise 50.0g of liquid ethanol at 25.0°C to 78.0°C and then evaporate? The specific heat of liquid ethanol is 2.44
J/gºC.*

Keneila is attempting to ski down a 20 m high friction free hill for the first time. she has a speed 10 m/s at the top. what is her kinetic energy when she is a the bottom, 20 m ? (a)2500 j (b)9800 j (c)12300 j (d)3100j (e)15000j

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?

In a system with only a single force acting upon a body, what is the relationship between the change in kinetic energy and the work done by the force? answers: work is equal to the change in kinetic energy. work depends on the square of the change in potential energy. work is equal to the negative of the change in kinetic energy. work is equal to the square of the change in kinetic energy