If by some miracle you were able to run electrical appliances with the energy you obtained from food (maybe something like running on a human hamster wheel) how many pieces of pizza (at 300 Calories each) would you have to eat to watch the Super Bowl (4 hours long) on your HDTV (175 Watts)? Assuming an efficiency of 20% for the human body, your electrical energy output is only 20% of your caloric energy intake.

1.00 × 10⁴ pieces of pizza

Explanation:

Step 1: Calculate the energy needed to watch the Super Bowl.

We need to produce energy to make an HDTV work (175 W) for 4 hours. First, we will convert, 4 hours to seconds using the conversion factor 1 h = 3600 s.

4 h × 3600 s/1 h = 14400 s

The energy required is:

14400 s × 175 J/s = 2.52 × 10⁶ J

We can convert this to calories using the conversion factor 1 cal = 4.184 J.

2.52 × 10⁶ J × 1 cal/4.184 J = 6.02 × 10⁵ cal

Step 2: Calculate the calories that the person should consume

Assuming an efficiency of 20% for the human body, the calories that a person should consume are:

6.02 × 10⁵ cal × 100/20 = 3.01 × 10⁶ cal

Step 3: Calculate the number of pieces of pizza to be consumed

Each piece of pizza contains 300 cal.

3.01 × 10⁶ cal × 1 piece/300 cal = 1.00 × 10⁴ pieces

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle