5. a kettle has a power of 1200 w (hint: 1200 w = 1200 j/s). if the kettle
takes 2.5 minutes to boil water, how much energy had been transferred?

180,000 Joules

Explanation:

Hint: 1200 W = 1200 J/S

The kettle takes 2.5 minutes to boil water.

1 minute = 60 seconds

2.5 minutes = ?

Cross multiplying gives; 150 seconds

The energy transferred to boil the water in 150 seconds = 1200 J/S × 150 S = 180,000 J

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.