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3 years ago

5

A boulder is raised above the ground so that its potential energy relative to the ground is 200 J. Then it is dropped. What is i

ts kinetic energy just before it hits the ground?

1 answer:

rosijanka [135]3 years ago

4 0

The energy would be 200 J.

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If the mass of a material is 43 grams and the volume of the material is 14 cm^3, what would the density of the material be

melomori [17]

Density is the mass of a substance every a unit of volume. Therefore, the formula to count density would be mass/volume. The calculation for this problem should be:

density= mass/volume
density= 43 grams / 14 cm^3= 3.07gram/cm^3 or 3.07 gram/ml

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3 years ago

An oil droplet is levitated and held at rest in a region where the electric field is 1.4x104 N/C directed vertically downwards.

Ratling [72]

W = m g weight of drop

W = q E

m = q E / g = = 3 e E / g

m = 3 * 1.6E-19 * 1.4E4 / 9.8 = 6.96E-16 kg

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2 years ago

What are the units of energy?

MaRussiya [10]

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3 years ago

Read 2 more answers

(Look at the minerals in the linked picture)

Crank

Both diamond and coal are formed by changes in pressure and temperature below the Earth's surface. The step in the formation of the minerals is <span>atoms break up in extreme heat. The answer is letter A.</span>

7 0

3 years ago

the candle had 350 J of energy in the chemical store. As it burned, 250 J was transferred by lighting to the surrounding

Elan Coil [88]

Answer:

Efficiency = 71%

Explanation:

Given the following data:

Output energy = 250 Joules

Input energy = 350 Joules

To find efficiency;

$Efficiency = \frac {Out-put \; energy}{In-put \; energy} * 100$

Substituting into the equation, we have;

$Efficiency = \frac {250}{350} * 100$

$Efficiency = 0.7143 * 100$

Efficiency = 71.43 ≈ 71%

Therefore, the efficiency of the candle is 71 percent.

4 0

3 years ago