Question

2. A person applies a force of 66 N to a fridge as they push it across the length of a standard tennis court. So far today, the person has consumed 850 calories. If it takes them 40 seconds to push the fridge the full length of the court, calculate the power output by the person and how many calories they burned during this activity.

Answer 1

Answer:

$P=39.2205\, watt$

$E=374.948 \,cal$

Explanation:

Given that:

• force applied, $F=66\,N$

• displacement, $s=23.77\,m$ (length of a tennis court)

• time taken for pushing, t = 40 s

Since, work is given by:

$W=F.s$

$W=66\times 23.77$

$W=1568.82\,J$

Now, power is given as:

$P=\frac{W}{t}$

$P=\frac{1568.82}{40}$

$P=39.2205 \,watt$

Calories consumed is:

$E= 1568.82\times 0.239$

$E=374.948\, cal$