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3 years ago

How much acceleration does a car need if it is to go a distance of 620 ft. In a time of 20 sec while it is speeding up

Physics

1 answer:

yan [13]3 years ago

3 0

31ft/second . 620/20

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This is heat transfer due to differences in density

Gala2k [10]

Answer:

convection

Explanation:

Heat transfer by convection is caused by differences of temperature and density within a fluid.

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3 years ago

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Place the following structures in the appropriate category based on their location in a cell

Studentka2010 [4]

Answer:

Cell surface.

Cilium
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Microvilus.

Nucleus

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3 years ago

What does it mean if an object is in motion?

Alina [70]

Explanation:

basically it's moving I think

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3 years ago

A stone is thrown straight downward with a speed of 20 m/s from the top of a tall building. If the stone strikes the ground 3.0

Lady_Fox [76]

Do you remember this formula for the distance traveled while accelerated ?

<u>Distance = (initial speed) x (t) plus (1/2) x (acceleration) x (t²)</u>

I think this is exactly what we need for this problem.

initial speed = 20 m/s down
acceleration = 9.81 m/s² down
t = 3.0 seconds

Distance down = (20) x (3) plus (1/2) x (9.81) x (3)²

Distance = (60) plus (4.905) x (9)

Distance = (60) plus (44.145) = 104.145 meters

Choice <em>D)</em> is the closest one.

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3 years ago

A rock is dropped from a vertical cliff. The rock takes 6.00 s to reach the ground below the cliff. What is the height of the cl

Lana71 [14]

Answer:

180 m

Explanation:

The rock follows a free-fall motion - so the vertical distance covered can be found by using the equation

$h=\frac{1}{2}gt^2$

where

g = 10 m/s^2 is the acceleration due to gravity

t = 6.00 s is the time of the fall

Substituting these data, we find the height of the cliff:

$h=\frac{1}{2}(10 m/s^2)(6.00 s)^2=180 m$

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3 years ago