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3 years ago

What law of motion corresponds with this statement?

Physics

1 answer:

choli [55]3 years ago

7 0

Second law

Explanation:

The law of motion that corresponds with the ease of starting a small car over a large car is the second law of motion.

Newton's second accurately deals with the relationship between mass, acceleration and force.

The law states that "the net force on a body is function of the product of its mass and acceleration".
The more mass a body has, the more force it requires to move it and vice versa.

Force = mass x acceleration

First law: a body will continue in its state of rest or uniform motion unless acted upon by an external force.

Third law: action and reaction are equal and opposite on a body.

learn more:

Newton laws brainly.com/question/11411375

#learnwithBrainly

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Suppose that the speed of yellow visible light in a certain transparent medium is 2.01* 105 km/s. What, approximately, is the in

True [87]

Answer:

$1.50$

Explanation:

Index of refraction:

$n=\frac{c}{v}$ where $n$ is the refractive index, $c$ is the speed of light in vacuum and $v$ is the speed of light in medium.

The speed of light in vacuum is $3.00 \times 10^5 \text{km/s}$

Speed of light in medium is $2.01 \times 10^5 \text{km/s}$

Thus,

$n=\frac{3.00\times 10^5}{2.01\times 10^5}$

$n=1.50$

Index of refraction of this substance through yellow light is $1.50$

4 0

3 years ago

Two billion people jump up in the air at the same time with an average velocity of 7.0 m/sec. If the mass of an average person i

faust18 [17]

Well first of all, you must realize that it depends on how the jumpers are distributed on the earth's surface. If,say, one billion of them are in the eastern hemisphere and the other billion are in the western one, then the sum of all of their momenta could easily be zero, and have no effect at all on the planet. I'm pretty sure what you must have in mind is to consider the Earth to be a block, with a flat upper surface, and all the people jump in the same direction.

average mass per person = 60 kg.
jump velocity = 7 m/s straight up and away from the block, all in the same direction
one person's worth of momentum = (m) (v) = 420 kg.m/s
sum of two billion of them = 8.4 x 10¹¹ kg-m/s all in the same direction

Earth's "recoil" momentum = 8.4 x 10¹¹ in the opposite direction = (m) (v)

Divide each side by 'm' :   v = (momentum) / (mass) =

The Earth's "recoil" velocity is (8.4 x 10¹¹) / (5.98 x 10²⁴) =

   1.405 x 10⁻¹³ m/s =

   <em> 0.00000000014 millimeter per second

</em>I have no intuitive feeling for this kind of thing, so can't judge whether
the answer is reasonable. But my math and physics felt OK on the
way to the solution, so that's my answer and I'm sticking to it.

4 0

4 years ago

A team of dogs accelerates a 290kg dogsled from 0 to 6.0m/s in 3.0 s. Assume that the acceleration is constant.Part AWhat is the

Mademuasel [1]

Answer:

(a) $a=2m/sec^2$

(b) 5220 j

(d) 3446.66 watt

Explanation:

We have given mass m = 290 kg

Initial velocity u = 0 m/sec

Final velocity v = 6 m/sec

Time t = 3 sec

From first equation of motion

v = u+at

So $a=\frac{v-u}{t}=\frac{6-0}{3}=2m/sec^2$

(a) We know that force is given by

F = ma

So force will be $F=290\times 2=580N$

(b) From second equation of motion we know that

$s=ut+\frac{1}{2}at^2=0\times 3+\frac{1}{2}\times 2\times 3^2=9m$

We know that work done is given by

W = F s = 580×9 =5220 j

We know that power is given as

$P=\frac{W}{t}=\frac{5220}{3}=1740Watt$

(d) Time t = 1.5 sec

So $P=\frac{W}{t}=\frac{5220}{1.5}=3466.66Watt$

5 0

4 years ago

No matter how well we get along with our parents as adolescents, there comes a time when we need to break away and assert our ow

KonstantinChe [14]

Answer: I never said anything to them but if i did it would be "I need a break from you, i love you but sometimes I have to find the path on my own." i would say this if i wasn't scared to hurt them.

Explanation:

5 0

3 years ago

What causes the jet stream? A. Differences in altitude between two air masses B. Differences in temperature between two air mass

padilas [110]

A jet stream forms high in the upper troposphere between two air masses of very different temperature. The greater the temperature difference between the air masses, the faster the wind blows in the jet stream.
.
.
So "Differences in temperature between two air masses" is the answer

3 0

4 years ago