Energy changes in a system, and the ways energy is stored before and after such changes

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Question 35

Medium

This question is about laser-propulsion transmitter calculations.

Write down the equation which links energy ( $E$ ), power ( $P$ ), and time ( $t$ ).

[1]

A ground-based laser-propulsion transmitter has a continuous power output of $MW480\text{ MW}$ . Calculate the total energy output of this transmitter if it beams continuously for 7500 s. Give your answer in Joules ( $J\text{J}$ ) in standard form.

[3]

Due to essential recalibration and cooling cycles, the laser transmitter is not active every day of the year. Over a standard year (where $days1\text{ year} = 365\text{ days}$ ), the transmitter was active for 78% of the year. Calculate the number of days during that year that the laser transmitter was active.

[2]

Energy changes in a system, and the ways energy is stored before and after such changes

Question 35

Energy changes in a system, and the ways energy is stored before and after such changes Questions

Energy changes in a system, and the ways energy is stored before and after such changes

Question 35

Energy changes in a system, and the ways energy is stored before and after such changes Questions