why heat is called energy in transit?

At the end of a 15 min session on a stationary bike at the gym, the bikes display indicates that you have delivered 150 kJ of energy to the bike in form of work. Your heart monitor shows that you have burned off 150 good calories. How much energy has your body lost to the surroundings? Q=     kJ

The energy stored in a foot of snow on a steel roof is

A 150-pound hiker walks at 3 mph up a 5% slope. This incline is a ratio of the vertical distance and horizontal distance expressed as a percentage (for example, the vertical distance increases by 5 feet for every 100 feet horizontally). What metabolic power is needed for this hike? (Hint: Model her power as a sum of the power needed to walk on level ground and the power needed to raise her body the appropriate amount).

What does it mean to say that human body is an engine with an efficiency of 20 percent?

You are cold, so you cover yourself in a blanket. A half hour later, you feel much warmer. Explain in detail where the heat came from, and how the blanket helped.

Why does air friction affect a car's gas mileage?

What are some of the different types of energy or power people experieence in daily living?