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djverab [1.8K]
3 years ago
10

Number 10. But I would like all of them so I can double check. Thank you.

Physics
1 answer:
Andru [333]3 years ago
3 0

Answer:

C=0.4m/s

a=v/t

0.1=v/4.0

v=0.1*4.0

V=0.4m/s

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A box has a weight of 150 N and is being pulled across a horizontal floor by a force that has a magnitude of 110 N. The pulling
ivann1987 [24]

Answer:

42.99°

Explanation:

F_h = Kinetic friction force

F_{\theta} = Pulling force at angle \theta

N_h = Weight of the box = 150 N

Kinetic friction force

F_h=\muN_h

Pulling force at angle \theta

F_{\theta}=\muN_{\theta}

N = Pulling force

According to question

\frac{F_h}{F_{\theta}}=\frac{2}{1}\\\Rightarrow \frac{\muN_h}{\muN_{\theta}}=2\\\Rightarrow \frac{N_h}{N_{\theta}}=2\\\Rightarrow N_{\theta}=\frac{N_h}{2}\\\Rightarrow N_{\theta}=\frac{150}{2}\\\Rightarrow N_{\theta}=75\ N

Applying Newton's second law in the vertical direction we get

N_h-Nsin\theta=N_{\theta}\\\Rightarrow 150-110sin\theta=75\\\Rightarrow \theta=sin^{-1}\frac{75}{110}\\\Rightarrow \theta=42.99\ ^{\circ}

The angle is 42.99°

8 0
4 years ago
A car applies a force of 20,000 N downward towards the street.
NikAS [45]

Answer:

The street applies a force of 20,000 N on the car.

Explanation:

Newton's Third Law of Motion states that for every action, there is an equal and opposite reaction. The car applies the same amount of force to the street as the street to the car.

5 0
4 years ago
Which of the following is the reason a lever is used in a shovel?
storchak [24]
The figure shown below illustrates a lever being used to lift a weight W.
The applied force is F.

In order to lift the weight, the minimum applied force is
F*b = W*a
F = (a/b)W

When the ratio a/b < 1, then the applied force is less than the weight.
The principle behind the use of a lever is to keep the ratio a/b small in order to decrease the effort force.

Answer: A
A lever is used to decrease effort force.

8 0
3 years ago
Read 2 more answers
If you drop a ball, and then one second later drop a ball identical in mass, size and shape, what happens to the distance betwee
Mumz [18]
They maintain the same distance between each other throughout the fall
8 0
3 years ago
Why do you think the rate of weathering tends to increase at hotter temperatures and higher amounts of rainfall?
lesya692 [45]

Answer:

Explanation:

Both increase in temperature and availability of water drives physical and chemical weathering and increases their rate.

Increase in temperature causes rocks to expand  and molecules are more free to move about. Constantly heating and cooling of a rock can lead to mechanical fracturing or cracks developing.

A high amount of rainfall facilitates chemical weathering. Chemical weathering is the decomposition of rocks.

The main agent that is important for natural chemical processes to occur is the presence water.

Water contains some other dissolved substances in it.

This is evident in tropical regions of the world

7 0
4 years ago
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