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3 years ago

EARTH SCIENCE HELP FAST PLEASE

Physics

1 answer:

xxTIMURxx [149]3 years ago

8 0

I think its C not sure tho

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If a car is moving +14m/s is to stop within 2 seconds, what must the car's acceleration be?

stellarik [79]

Acceleration is -7 m/s²

Explanation:

initial velocity (u) = 14 m/s

since it's gonna stop,

final velocity (v) = 0m/s

time taken(t) = 2 seconds

now,

a = (v-u)/t

or, a = (0-14)/2

or, a = -14/2

a = -7m/s²

4 0

3 years ago

State the conservation of momentum theorem

Luda [366]

Answer:

The total momentum of the two objects before the collision is equal to the total momentum of the two objects after the collision.

7 0

3 years ago

A cart on a horizontal, linear track has a fan attached to it. The cart is positioned at one end of the track, and the fan is tu

kompoz [17]

Answer:

$F = 0.0566 \ N$

$t = 6.147 \ s$

Explanation:

From the question we are told that

The distance travel in 4.22 s is $s = 1.44 \ m$

The mass of the cart plus the fan is $m = 350 \ g = 0.35 \ kg$

Generally from kinematic equation we have that

$s = ut + \frac{1}{2} * a * t^2$

Here u is the initial velocity with value $u = 0 \ m/s$

$1.44= 0 * t + \frac{1}{2} * a * 4.22^2$

=> $a = 0.1617 \ m/s^2$

Generally the net force is

$F = m * a$

=> $F = 0.35 * 0.1617$

=> $F = 0.0566 \ N$

Gnerally the new mass of the cart plus the fan is $M = 656 \ g = 0.656 \ kg$

The distance considered is $s_1 = 1.63 \ m$

Generally the new acceleration of the cart is mathematically represented as

$F = M * a_1$

=> $a_1 = \frac{F}{M}$

=> $a_1 = \frac{0.0566}{0.656}$

=> $a_1 = 0.08628 \ m/s^2$

Gnerally from kinematic equation we have

$s = ut + \frac{1}{2} * a_1 * t ^2$

Here u is the initial velocity and the value is zero because it started from rest

=> $1.63 = 0 * t + \frac{1}{2} * 0.08628* t ^2$

=> $t = 6.147 \ s$

6 0

3 years ago

2. Why do some clouds rain while others do not?

andreyandreev [35.5K]

Some clouds do not rain and others do because the clouds that do not rain do not have enough water in them. White clouds are ones that do not have enough water in them.

<h2>Hope this helps!</h2>

4 0

3 years ago

Scientific notation is a method of expressing very small and very large numbers *<br><br> yes<br> No

mars1129 [50]

The answer is yes:)
Scientific notation is the expression of a number in the form of x * 10^x

4 0

4 years ago