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RideAnS [48]
4 years ago
12

9. A child standing on a bus remains still when the bus is at rest. When the bus moves forward and then slows down, the child co

ntinues moving
forward at the original speed. This is an example of
A. Newton's First Law of Motion
B. Newton's Third Law of Motion
C, an action-reaction par
D. Newton's Second Law of Motion
Physics
1 answer:
marin [14]4 years ago
3 0
I think the answer is C
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A steel ball with mass m is suspended from the ceiling at the bottom end of a light, 17.0-m-long rope. The ball swings back and
iogann1982 [59]

Answer:

1. 18.25 m/s

2. 0 m/s

Explanation:

1.So the centripetal acceleration of the ball at this lowest point must be, taking gravity into account

a_c = \frac{T - mg}{m} = \frac{3mg - mg}{m} = 2g

The speed at this point would then be

v^2 = a_c r = 2gr = 2*9.8*17 = 333.2

v = \sqrt{333.2} = 18.25 m/s

2. Similarly, if T = mg, then the centripetal acceleration must be

a_c = \frac{T - mg}{m} = \frac{mg - mg}{m} = 0

As the ball has no centripetal acceleration, its speed must also be 0 as well.

6 0
4 years ago
Describe what you think the phrase “greater freedom of movement” means?
JulijaS [17]
<h2>Answer: where the is freedom for all , where we can all be together equal in peace , where eveyone can be happy and live in harmony </h2>

Explanation:

5 0
3 years ago
vehicles equipped with disc brakes incorporate a mechanically operated drum-style parking brake in the center of the rear disc b
umka21 [38]

Vehicles equipped with disc brakes incorporate a mechanically operated drum-style parking brake in the center of the rear disc brake rotors, commonly called a top hat parking brake.

<h3>What is top hat parking brake?</h3>

The top hat drum style of parking brake system is called the top hat rotors because of how big the middle part is compared to regular rotors.

In this type of parking brake system, the vehicle is equipped with disc brakes which incorporate a mechanically operated drum-style parking brake in the center of the rear disc brake rotors.

Thus, vehicles equipped with disc brakes incorporate a mechanically operated drum-style parking brake in the center of the rear disc brake rotors, commonly called a top hat parking brake.

Learn more about top hat parking brake here: brainly.com/question/21854030

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2 years ago
What is a energy transformation when using a microwave to make popcorn?
Snowcat [4.5K]

Answer:

Radiation

Explanation:

6 0
3 years ago
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A marketing executive is investigating whether this year’s advertising campaign has resulted in greater mean sales compared with
djverab [1.8K]

We make use of a one-sample t-test for a population mean.

One-sample t-test for a population mean

Option B

<h3> Sample mean and Sample standard deviation</h3>

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The sample mean is is the mean of the randomly selected sample

Therefore, For a data or sample where we have no information on population standard deviation and here only one sample group is compared, we make use of a one-sample t-test for a population mean

A one-sample t-test for a population mean

More on Probability

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