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Stells [14]
3 years ago
13

Plzzzz help me with science

Physics
1 answer:
Damm [24]3 years ago
4 0
1. I believe that the answer is D. 

2. D. a car moving northeast at 90km/hr

3. C. The car's displacement stays the same

4. C. Segment Y



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In which situation is work being done?
Keith_Richards [23]

Answer: D. The force and displacement are in the same direction.

Explanation:

The Work W done by a Force F refers to the release of potential energy from a body that is moved by the application of that force to overcome a resistance along a path with distance d.  

Work is a scalar magnitude, and its unit in the International System of Units is the Joule (like energy).

Now, when the applied force is constant and the direction of the force and the direction of the displacement are <u>parallel</u>, the equation to calculate it is:  

W=(F)(d) (1)

When they are not parallel, both directions form an angle, let's call it \alpha. In that case the expression to calculate the Work is:  

W=Fdcos{\alpha} (2)

When the force and displacement are perpendicular to each other,\alpha=90\° and <u>no work is done</u>.

4 0
4 years ago
A substance sample has a Mass of 45.0 g, and the Data Safety
marishachu [46]

The volume of the sample is 48.39 cm³.

<h3 /><h3>What is volume?</h3>

The term volume refers to the amount of three-dimensional space taken up by an item or a closed surface

To calculate the volume of the sample, we use the formula below

Formula:

  • D = m/v
  • v = m/D................ Equation 1

Where:

  • m = Mass of the smaple
  • D = Density of the sample
  • v = Volume of the sample.

From the question,

Given:

  • m = 45 g
  • D = 0.93 g/cm³

Substitute these values into equation 1

  • v = 45/0.93
  • v = 48.39 cm³

Hence, the volume of the sample is 48.39 cm³.

Learn more about volume here:brainly.com/question/27710307

#SPJ1

8 0
2 years ago
How many electrons does bromine (#35) have in its valence level?
kupik [55]
Bromine has 7 electrons in their valence shell.......
7 0
3 years ago
Read 2 more answers
If a body is moving with a constant velocity then it has ................. acceleration
MakcuM [25]

Answer:

accelerates

Explanation:

tell more please

5 0
3 years ago
Read 2 more answers
A radioactive atom has just undergone nuclear decay. Its mass number is now four less than the original atom. Which type of nucl
fredd [130]

Answer:

Explanation:

mass number is now 4 times less than the original value so alpha decay occur during alpha decay the mass number is decreased 4 times and atomic number decreased 2 times than the original value

4 0
3 years ago
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