The term pressure most nearly refers to which of the following?A. another term for density
B. a property of water near the ocean bottom
C. force per area created by the weight of water
D. the pushing of ocean currents on objects in the ocean

Answers

Answer 1

Answer:
The correct answer would be C. force per area created by water.

Answer 2

Answer: pressure is force per unit area or p=f/a. The pressure at the bottom of the ocean =weight of overlying water /1m^2. Think of it as the weight of a column of water 1 meter square sitting on the ocean floor. so the correct answer is "C".

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The age of the universe is thought to be about 14 billion years. Assuming two significant figures, write this in powers of ten in years

Answers

14x10^9 remember to hit that thanks button and rate 5 stars please!!!!

Elena (60.0 kg) and Madison (65.0 kg) are ice-skating at the Rockefeller ice rink in New Yok city. Their friend Tanner sees Elena move to the right with a speed of 1.20 m/s towards Madison. Madison is moving to the left at a speed of 2.50 m/s towards Elena.1. What is Elena's momentum? (Assume the positive direction is to the right and the negative direction is to the left.)
2, What is Madison's momentum? (Assume the positive direction is to the right and the negative direction is to the left.)
3. What is the total momentum of Elena and Madison?
4. When Elena and Madison collide, they hold onto each other. With what speed and in what direction do both of them move at?

Answers

1. +72.0 kg m/s

The momentum of an object is given by:

p = mv

where

m is the mass of the object

v is its velocity

Taking "to the right" as positive direction, for Elena we have

m = 60.0 kg is the mass

v = +1.20 m/s is the velocity

So, Elena's momentum is

$p_e=(60.0 kg)(+1.20 m/s)=+72.0 kg m/s$

2. -162.5 kg m/s

Here Madison is moving in the opposite direction of Elena (to the left), so her velocity is

v = -2.50 m/s

while her mass is

m = 65.0 kg

Therefore, her momentum is

$p_m= (65.0 kg)(-2.50 m/s)=-162.5 kg m/s$

3. -90.5 kg m/s

The total momentum of Elena and Madison is equal to the algebraic sum of their momenta; taking into account the correct signs, we have:

$p=p_e + p_m = +72.0 kg m/s - 162.5 kg m/s =-90.5 kg m/s$

4. 0.72 m/s to the left

We can find the final speed of Elena and Madison by using the law of conservation of momentum. In fact, the final momentum must be equal to the initial momentum (before the collision).

The initial momentum is the one calculated at the previous step:

$p_i = -90.5 kg m/s$

while the final momentum (after the collision) is given by

$p_f = (m_e + m_m) v$

where

$m_e$ is Elena's mass

$m_m$ is Madison's mass

v is their final velocity

According to the law of conservation of momentum,

$p_i = p_f\np_i = (m_e + m_m) v$

So we can find v:

$v=(p_i)/(m_e + m_m)=(-90.5 kg m/s)/(60.0 kg+65.0 kg)=-0.72 m/s$

and the direction is to the left, since the sign is negative.

Final answer:

Elena's momentum is 72.0 kg*m/s to the right, Madison's is -162.5 kg*m/s to the left. The total system momentum is -90.5 kg*m/s to the left. After colliding, they move together with a speed of 0.724 m/s to the left.

Explanation:

The subject here is Physics, specifically the conservation of momentum. Momentum is calculated as mass times velocity. The positive and negative signs denote direction (right, left).

Elena's momentum is the product of her mass (60.0 kg) and velocity (1.20 m/s). Hence, momentum = 60.0 kg * 1.20 m/s = 72.0 kg*m/s towards the right (positive).
Madison's momentum is the product of her mass (65.0 kg) and velocity (2.50 m/s). Because she's moving to the left, the velocity is negative. Hence, momentum = 65.0 kg * -2.50 m/s = -162.5 kg*m/s towards the left (negative).
The total momentum of Elena and Madison is the sum of their individual momenta: 72.0 kg*m/s + (-162.5 kg*m/s) = -90.5 kg*m/s to the left.
When they collide and hold onto each other, they move together, so their combined mass is 60.0 kg + 65.0 kg = 125.0 kg. The total system's momentum should still be conserved, so -90.5 kg*m/s = 125.0 kg * velocity. Solving for the speed gives velocity = -90.5 kg*m/s / 125.0 kg = -0.724 m/s. The negative sign indicates they move in the negative direction or to the left.

Learn more about Momentum here:

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What are minerals made of a single element called?

Answers

Minerals of a single element are called Native elements. These include gold, silver, copper, etc. They can be divided into three groups such as metals, semi-metals, and nonmetals. Hope this helped.

What is the best temperature for a refrigerator?

Answers

the best temperature for a refrigerator is 40 degrees F (4 degrees C)

The best temperature for your refrigerator should be 40 degrees F, 40 degrees C in this case. (: Hope this helped!

Personification means to give human characteristics to animals, ideas, and objects. a. True
b. False

Answers

True hope this helps :3

True! "The hurricane was angry." That is an example of personification.

A total solar eclipse is visible froma. all over Earth.
b. only within the moon’s umbra.
c. only within the moon’s penumbra.
d. only the dark side of Earth.

Answers

Answer:

b. only within the moon’s umbra.

Explanation:

Solar eclipse occurs when Moon comes between the Sun and the Earth in straight line and blocks the sunlight. A shadow of moon castes on the surface of the Earth. The region passing through the moon's umbra would view a total solar eclipse. The moon completely hides the surface of the sun. It would be visible to the people residing in the bright side of the Earth within the Umbra of the moon.

Only within the umbra of the moon's shadow.

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