An ice cream has a marked value of 700 , kcal | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) We know that $1 \, kcal = 1000 \, cal = 4200 \, J$.The conversion factor from Joules to kilowatt-hour $(kWh)$ is $1 \, kWh = 3.6 	imes 10^6 \, J$

Vedclass · Accepted Answer

$0.81$

Vedclass · Answer

(A) We know that $1 \, kcal = 1000 \, cal = 4200 \, J$.The conversion factor from Joules to kilowatt-hour $(kWh)$ is $1 \, kWh = 3.6 	imes 10^6 \, J$.Therefore,$1 \, kcal = \frac{4200}{3.6 	imes 10^6} \, kWh = \frac{4.2 	imes 10^3}{3.6 	imes 10^6} \, kWh = \frac{4.2}{3.6} 	imes 10^{-3} \, kWh \approx 1.166 	imes 10^{-3} \, kWh$.For $700 \, kcal$,the energy in $kWh$ is:$E = 700 	imes \frac{4200}{3.6 	imes 10^6} \, kWh$$E = \frac{2,940,000}{3,600,000} \, kWh$$E = \frac{294}{360} \, kWh = 0.8166... \, kWh$.Rounding to two decimal places,we get $0.81 \, kWh$.

An ice cream has a marked value of $700 \, kcal$. How many kilowatt-hour $(kWh)$ of energy will it deliver to the body as it is digested?

Similar Questions

What is a unit? What are fundamental units and derived units?

Are $AU$ and $\mathring{A}$ the same units of length?

Fill in the blanks:
$(a)$ $1 \, rad = \dots \text{ degrees}$
$(b)$ Light year is a unit of $\dots$
$(c)$ The solid angle subtended by a hemisphere at its center is $\dots$

$A$ physical quantity is measured and its value is found to be $nu$, where $n$ is the numerical value and $u$ is the unit. Then which of the following relations is true?

$Newton/meter^2$ is the unit of

Vedclass Test Series

Exam Paper Generator

Online Exam Module