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Gre4nikov [31]
3 years ago
9

To calculate density, both _____ must be measured.

Physics
1 answer:
Mama L [17]3 years ago
7 0

Answer:

Mass & volume

Explanation:

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Answer the questions below correctly (please) and I'll give brainliest!
gregori [183]

Answer:

The difference between the greenhouse effect and global warming is that the greenhouse effect is when the sun’s energy reaches the earth’s atmosphere and some of it is reflected back to space and the rest is absorbed and re-radiated by greenhouse gases. Global warming is the unusually rapid increase in Earth’s average surface temperature. The difference is that that the green house effect is a natural process that happens constantly and global warming is a change due to earth’s climate causing it to heat up. Carbon monoxide affects global warming by trapping the gasses in the atmosphere which causes an increase in temperature. For an example, three sources of atmospheric carbon dioxide is car fumes, factory fumes, and coal.

Explanation:

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3 years ago
A marble is dropped off the top of a building. Find it's velocity and how far below to its dropping point for the first 10 secon
WINSTONCH [101]

1) velocity: 98 m/s downward

Explanation:

The marble moves by uniformly accelerated motion, with constant acceleration a=g=-9.8 m/s^2 directed towards the ground. Therefore, its velocity at time t is given by:

v(t)=v_0 +at

where

v_0 = 0 is the initial velocity

a=g=-9.8 m/s^2 is the acceleration

t is the time

Substituting t = 10 s, we find:

v(10 s)=0+(-9.8 m/s^2)(10 s)=-98 m/s

And the negative sign means the direction of the velocity is downward.


2) Distance covered: 490 m

The distance covered in an uniformly accelerated motion can be found with the formula:

S=\frac{1}{2}at^2

where

a=-9.8 m/s^2 is the acceleration

t is the time

Substituting t=10 s, we find

S=\frac{1}{2}at^2=\frac{1}{2}(-9.8 m/s^2)(10 s)^2=-490 m

And the negative sign means the displacement is below the dropping point.

4 0
3 years ago
How much energy has 4×10^10m^3 of water collected in a reservoir at a hight of 100 m from the power house ?What kind of energy i
sveticcg [70]

Answer:

PE = 3.92x10^16J

potential energy

Explanation:

PE = m*g*h

mass of water = 1000kg/m³

(4*10^10m³)*1000kg = 4*10^13kg

PE = (4*10^13kg)*(9.81m/s²)*(100m)

PE = 3.92x10^16J

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3 years ago
What provides most of the force to allow the runners to move?
kobusy [5.1K]

Answer:

When you are running the most important force that you should understand is friction. Friction is a force that opposes movement between two objects, but for runners friction makes you faster. Friction gives you a better and more efficient way to use your energy into speed.

4 0
3 years ago
Which of the following scientists inferred that an atom positive charge must be clustered
nevsk [136]
Тнe Anѕwer


-It was Ernest Rutherford
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