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3 years ago

9

Newton's laws of motion

1 answer:

wel3 years ago

7 0

1) The purse falls to the ground because of Newton’s first law, an object in motion stays in motion and an object at rest will stay at rest until an unbalanced force changes it. The first law includes inertia, which occurs when the object wants to continue to go forwards even when it’s been stopped. When Jane stops her car, the purse wants to keep going forward, therefore falling to the ground.

2) when you’re standing on the board, the board pushes up on you, while you/gravity is pushing downwards // when you jump down, the opposite force pushes upwards, allowing you to go up (jump)

3) Newton’s second law, A=F/M

5) 19.5 newtons

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Answer:

Explanation:

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3 years ago

You drive 773 miles east, then turn around and drive 773 miles west. What is your displacement, to the nearest mile?

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3 years ago

Mark pushes his broken car 140 m down the block to his friend's house. He has to exert a 160 N horizontal force to push the car

sesenic [268]

The thermal energy used by the tires is 1.14 J.

Here, the thermal energy used will be the work done by Mark.

Given,

Distance = 140 m

Force exerted = 160 N

Thermal energy = ?

We know,

Work = force * displacement

But here the thermal energy of tires is asked.

In this question, the thermal energy used is the energy consumed to do the work.

So, using the formula of work we can find the thermal energy.

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Therefore the thermal energy used by the tires is 1.14J

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1 year ago

Find the elongation produced in a copper wire of length 2m and radius 5mm, when suspended by a block

igomit [66]

Answer:

0.104 m

Explanation:

Stress, $\sigma=\frac {F}{A}$

Where F is force and A is area. Also, F=mg where m is mass and g is acceleration due to gravity

$Area= \pi r^{2}$

$Strain=\frac {\triangle l}{l}$ where $\triangle l$ is the elongation and l is the original length

$E=\frac {stress}{strain}=\frac {\frac {F}{A}}{\frac {\triangle l}{l}}=\frac {Fl}{A\triangle l}$

Making $\triangle l$ the subject then

$\triangle l=\frac {Fl}{AE}=\frac{mg l}{\pi r^{2} E}$

By substituting the given values and taking g as 9.81 then

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3 years ago

Balancing carefully, three boys inch out onto a horizontal tree branch above a pond, each planning to dive in separately. The th

VikaD [51]

Answer:

what is this a riddle lol it breaks when he either jumps or lands

Explanation:

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3 years ago