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4 years ago

8th grade science question on forces, please help me im soooo close and i dont understand this one :)

Physics

2 answers:

marin [14]4 years ago

7 0

Answer: The dog is pull the stick away from the boys hand

the boy is also pulling if the boy lets go of the stick the dog will fall due to law of action and reaction

The man is pushing the horse cart up the hill to do so he has to apply force

Explanation:

Lady_Fox [76]4 years ago

7 0

Answer:

The stick is being pulled to the right by the dog, but that force is being counter-acted by the boy, who is pulling the stick to the left.

The wagon is being pulled to the right by the horses, and the man is also pushing the cart, applying force to make it go right.

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Which of the following will increase the strength of a copper electromagnet?

Lemur [1.5K]

Answer:D & E are your answers just took the quiz in APEX

Explanation:

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3 years ago

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An isotope has a half life of 2 days. After 6 days, how much of the original material is left?

OlgaM077 [116]

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I think B is the answer of this question

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3 years ago

You place a penny on a turntable at a distance of 14.3 cm from the center. The coefficient of static friction between the penny

S_A_V [24]

Answer:

Time will be 2.13 sec

Explanation:

We have given that distance r = 14.3 cm = $=\frac{14.3}{100}=0.143m$

Coefficient of static friction $\mu =0.4$

Angular acceleration is given by $\alpha =2.45rad/sec^2$

We know that frictional force is given by $F=\mu mg$

And centrifugal force is given by $F=\frac{mv^2}{r}$

When coin just starts moving

$\mu mg=\frac{mv^2}{r}$

We know that $v=\omega r$ , here $\omega$ is angular velocity

According to first equation of motion we know that

$\omega =\omega _{i}+\alpha t$

As $\omega _i=0$

so $\omega =\alpha t$

$\mu g=\frac{\left ( r\alpha t \right )^2}{r}$

$\frac{\mu g}{r}=a^2t^2$

$t=\frac{\sqrt{\frac{\mu g}{r}}}{α}$

$t=\frac{\sqrt{\frac{0.4\times 9.8}{0.143}}}{2.45}=2.13sec$

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3 years ago

A purple beam is hinged to a wall to hold up a blue sign. The beam has a mass of mb = 6.2 kg and the sign has a mass of ms = 17

natka813 [3]

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3 years ago

What two quantities are always conserved in a nuclear reaction equation?

kupik [55]

Answer:B

Explanation:

Option A:

In the nuclear reactions,neutron can be split into proton an electron.

In this case,the number of protons are increasing,increasing the atomic number.

Hence,the atomic number is not conserved.

Option B:

In any reaction the sum of number of neutrons and number of protons remain constant before and after the reaction.

Option C:

The mass number may change for the atoms.For example $\alpha$ emission reduces the atomic number by $2.$

Option D:

In the nuclear reactions,neutron can be split into proton an electron.

So,they number of neutrons may change.

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3 years ago