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GalinKa [24]
4 years ago
8

What is needed for work to be done?

Chemistry
1 answer:
podryga [215]4 years ago
7 0

Answer:

Force should applied on the object and object should move.

Explanation:

Work may be defined as the movement of the object  in the direction of the applied external force. Work is a scalar quantity and shows the magnitude only.

The work needs to be done, the force should be applied on the object and the object must show some dipsplacement in the direction of force. The work can be calculated by the product of force and displacement.

Thus, the answer is force should applied on the object and object should move.

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Generators make electricity by _________________ magnets.
scoundrel [369]
As the shaft inside the generator<span> turns, an </span>electric<span> current is produced in the wire. The </span>electric generator<span> is converting mechanical, moving energy into </span>electrical<span>energy. 
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5 0
3 years ago
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A block has a mass of 25 grams and a volume of 24.5 cm3 what is the<br> density of the block?
schepotkina [342]

Answer:

<h3>The answer is 1.02 g/cm³</h3>

Explanation:

The density of a substance can be found by using the formula

density =  \frac{mass}{volume} \\

From the question

mass of block = 25 g

volume = 24.5 cm³

The density of the block is

density =  \frac{25}{24.5}  \\  = 1.020408163...

We have the final answer as

<h3>1.02 g/cm³</h3>

Hope this helps you

7 0
3 years ago
What's the momentum of a 3.5-kg boulder rolling downhill at 5 m/s? A. 17.5 km·m/s B. 70 kg·m/s C. 8.5 kg·m/s D. 14.3 kg·m/s
swat32

Hey There!:


p = m * V


p = 3.5 * 5


p = 17.5 Km.m/s


Answer A


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7 0
3 years ago
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Express the following number in scientific notation. 0.53000 = _____
kakasveta [241]
Yes, it would be the last one as the zeros that appear after a non zero number are significant.
7 0
3 years ago
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Suppose you wanted to measure the amount of DDT in a food chain. Which animals in the food chain would you measure? Explain your
katen-ka-za [31]

The fish is the  first organism that would be tested and measured for DDT as it pass on the DDT to the upward trophic level in food chain. After that predators will be checked for DDT concentration.

Explanation:

DDT level in the organism gets increase as it moves upward in the trophic level.

Toxins as DDT gets incorporated to fats and tissues of the organism. It gets soluble in fats.

The highest concentration of DDT is observed in tertiary consumers as carnivore.

It can be seen that DDT concentration is more in producers than primary consumers. With the process of biomagnification the concentration of DDT increases at successive levels.

In aquatic food chain pesticides or heavy metals are consumed by aquatic organsims which are consumed by large birds and human. The DDT level will be checked in fish then birds and humans.

6 0
4 years ago
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