Acd player uses 1,200 joules of energy in 60 seconds. what is the power rating of the cd player? 72,000 w 600 w 20 w 0.05 w

Option (c) is the correct answer.

Explanation:

Power is defined at the amount of work done in per unit time.

Mathematically,          P =

where             P = power

                       W = work

                        t = time

Since, it is given that work or energy is 1,200 joules and time is 60 seconds. Therefore, calculate the power as follows.

                          P =

                              =

                              = 20 joules/second

or,                           = 20 Watt

Thus, we can conclude that the power rating of the CD player is 20 W.

the equation that correctly represent the reaction for formation of ammonia is

n2+ 3h2 → 2nh3 (answer d)

1 mole of nitrogen gas (n2) react with 3 moles of hydrogen gas (h2) to form 2 moles of ammonia ( nh3). this is in a process known as haber process were iron is used as a catalyst and reaction take place that a higher temperature and pressure. the process is exothermic hence energy is released.

the answer is   c.) 1575 j.

explanation: