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Question:

The potential energy of an object with a mass of 5kg that is placed 20 meters above the surface of the earth is most nearly `____`.

A 981 Joules

explanation

The potential energy of an object is equal to Ep = mgh, where m is the mass, g is the gravitational acceleration constant, and h is the height. The gravitational acceleration is 9.81 m/s2. As a result, we can calculate the potential energy to be: Ep = 5kg * 9.81 m/s2 *20m = 981 Joules.

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In the lily flower, the red color is dominant and the white color is recessive. This means that if you cross a homozygous red flower with a white one, the offspring will be ____.

All red

If a gene is dominant, then that means the crossing of a homozygous red flower with a white flower will result in all red offspring (who will be heterozygous).

About how long does it take the Earth to complete an orbit of the sun

1 year

It takes the earth 1 year to complete one trip around the sun

The cell membrane is a structure composed primarily of ____.

Lipid

The cell membrane is a lipid bilayer, and is composed primarily of two layers of lipid molecules that are lying opposite to one another. The cell membrane does contain some protein, but not very much.

If a bowling ball is pushed with 20 Newton of force and has a mass of 4 kg, what is its initial acceleration?

(5 m/s^2\).

The equation to calculate acceleration from force is F = ma. Given a force of 20 N, and a mass of 4 kg, we can find that 20 N/4kg = \(5 m/s^2\) acceleration.

Which of these planets is located farthest from the sun?

Neptune

The order of the planets from the sun is: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.

Plants are autotrophs, meaning that they:

Are able to produce their own food

Autotrophs are organisms that are able to produce their own food. On the other hand, heterotrophs are organisms that must consume other organisms to survive.

A train travels at 25 mph for 3 hours. How far did the train move?

75 miles

If a train is moving at 25 mph, then each hour it will travel 25 miles. If it travels for 3 hours, then it must have gone 25 x 3 = 75 miles.

A Celsius temperature of 100 degrees is equivalent to a Fahrenheit temperature of:

212 degrees

Celsius temperature of 100 degrees = 212 degree Fahrenheit

Which of the following planets has a perfectly circular orbit?

None of the above

None of the planets have perfectly circular orbits. Planets orbit in an elliptical shape, which can be thought of as an oval. The planets that are farther from the sun, such as Neptune, have significantly more elliptical orbits than the planets closer to the sun.

Which of the following are NOT decomposers?

vultures

Vultures are considered to be scavengers since they eat dead animals. Decomposers are organisms that break down organic matter from dead animals and plants into simpler substances.

A solution contains 0.1 molar hydrogen ions (H+). This means the solution is likely:

Around pH 1.0

If a solution contains hydrogen ions, then it will be acidic, which means low pH. We can calculate the pH with the pH equation, where pH = -log (H+), or we can use our intuition. 0.1 molarity of ions is quite strong, and we would expect it to be a strong acid, which would mean it must be below pH 2.0.

How long does it take the earth to rotate 90 degrees?

6 hours

The earth rotates 360 degrees in 24 hours, therefore it rotates 90 degrees in 6 hours.

In an electromagnetic wave, as the frequency of the wave becomes greater, what becomes shorter?

The wavelength

In wave physics, l = v/f, where l is the wavelength and f is the frequency. As a result, as frequency increases, the wavelength must decrease if the velocity stays the same (which it does, because velocity is an independent property in this equation).

Which of the following is a positively charged subatomic particle

Proton

A Proton is a stable subatomic particle that occurs in all atomic nuclei. It has a positive electric charge.