Fthe work put into a lever is 930 joules and the work accomplished is 870 joules, the efficiency of the lever is

If the work put into a lever is 930 joules and the work accomplished is 870 joules, the efficiency of the lever is 94%.

Explanation:

The work put into the lever, input power of the lever = 930 joules

Work accomplished, output power of the lever = 870 joules.

Efficiency = output power / input power in terms of percentage.

Efficiency = 870 / 930 = 0.935.

Efficiency in terms of percentage = 0.935 * 100 = 94%

Therefore, efficiency of the lever = 94%.

correct it is c.) b b

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.