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Dimas [21]
3 years ago
6

A teacher attaches a ball to a meter long string and whirls it around in a horizontal circle at constant speed. The teacher expl

ains that the string is what makes the ball go in a circle. Why is the string necessary? A) The string is needed to apply a torque to the ball. B) The string is needed to push on the ball to get it up to speed. C) Circle motion requires an inertia which is provided by the string. D) Circle motion requires a force to give it a centripetal acceleratio
SAT
2 answers:
Agata [3.3K]3 years ago
7 0

To whirl any object in a circle, the most necessary factors are a force and a perpendicular distance about its centre.

And the product of these two factors gives torque i.e torque= force × perpendicular distance.

Hence A is the correct answer.

Yuliya22 [10]3 years ago
5 0

The string is needed to apply a torque to the ball.

Answer: Option A

<u>Explanation:</u>

To rotate any object in a circle, the most important factors are force and perpendicular distance around the center. The product of these two factors produces torque, i.e. Forces x vertical distance. An object moving in a circle must exert an internal force to achieve internal acceleration.

In this case, the string is needed for the ball to rotate, because that makes the ball go in a circle. This is done by dragging the object to the center of the circle.

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A player pays $15 to play a game in which a chip is randomly selected from a bag of chips. The bag contains 10 red chips, 4 blue
Eddi Din [679]

The mean of the random variable w that represents the total amount won is; -$4.50

We are given quantity of chips inside the bag as;

  • Number of red chips = 10
  • Number of blue chips = 4
  • Number of Yellow chips = 6

Total number of chips = 20

Thus;

  • P(Red chips) = 10/20 = 0.5
  • P(blue chips) 4/20 = 0.2
  • P(Yellow Chips) = 6/20 = 0.3

Amount won from the selection of Red Chip = 0.5 * $5 = $2.5

Amount won from the selection blue Chip = 0.2 * $10 = $2

Amount won from selection of yellow chip = 0.3 * $20 = $6

Thus;

x = $2.5 + $2 + $6

x = $10.5

We are told that total amount won is gotten from;

w = x − 15

Thus;

w = 10.5 - 15

w = -$4.50

Read more on expected value at; brainly.com/question/24855677

6 0
2 years ago
Which scatterplot demonstrates the strongest relationship between two quantitative variables?
andreyandreev [35.5K]

The scatterplot demonstrates the strongest relationship is, a graph has x on the x-axis, and y on the y-axis. Points increase loosely together.

<h3>Correlation coefficient of scatterplot</h3>

The correlation coefficient of scatterplot is used to demonstrate the relationship between variables.

When two variables increases together, they are said to have positive correlation.

When one is increasing and another is decreasing, they are said to have negative correlation.

When most of  data points form a straight line or lies close to the straight line, it indicates strong linear correlation.

From the given options;

  • Option A, zero correlation
  • Option B, less than 1
  • Option C, 1 or greater than 1
  • Option D, -1 or less than 1

Thus, the scatterplot demonstrates the strongest relationship between two quantitative variables is option C, "a graph has x on the x-axis, and y on the y-axis. Points increase loosely together".

The complete question is below:

A. A graph has x on the x-axis, and y on the y-axis. Points are scattered throughout the graph.

B. A graph has x on the x-axis, and y on the y-axis. Points curve up and then down in a line.

C. A graph has x on the x-axis, and y on the y-axis. Points increase loosely together.

D. A graph has x on the x-axis, and y on the y-axis. Points decrease loosely together.

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5 0
2 years ago
Helppp pleaseee (10 points ) with solution
allsm [11]
It’s too long so I won’t write entire paragraph but hint: use the ASA method!(angle side angle) since you know that their two angles and one side are the same.
5 0
2 years ago
How is the united states government based upon john.
svetlana [45]

Answer:

The United States government is based on the ideas of equality and the rights you have by being human such as life, liberty, and the pursuit of happiness. These are all ideas expressed by John Locke. John Locke believed that no king and no person had the right to rule over a human being without their consent.

Explanation:

3 0
2 years ago
Read the article and use the information to answer the following questions. aquatic biomes describe the parts of an ecosystem fo
Nadusha1986 [10]

According to the article, an estuary is a coastal body of water where the mouth of a river meets the sea.

<h3>What are the parts of the ecosystem found in estuaries?</h3>

It is the aquatic biome where a high-flow watercourse empties into the ocean, generally, it is found in areas with high-amplitude tides.

As to the living parts of the ecosystem found in estuaries, a great variety of fish and molluscs are concentrated.

On the other hand, the nonliving things of this ecosystem are low in salinity due to the fact that the sea water, when it meets the river water, loses a large percentage of it, it also offers an ideal temperature for the proliferation of life.

Therefore, we can conclude that according to the article, an estuary is a coastal body of water where the mouth of a river meets the sea.

Learn more about ecosystem found in estuaries here: brainly.com/question/2865934

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6 0
2 years ago
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