PHYSICS HIGH SCHOOL

An individual center of gravity can usually be found __________?A.
just above the belly button
B.
just above the knees
C.
just below the neck
D.
just below the hips

Answers

Answer 1
Answer:

An individual center of gravity can usually be found just below the hips. The correct option is D.

Usually, a person's centre of gravity is situated just below the hips. The location where the body's mass is equally distributed in all directions is referred to as the center of gravity.

The centre of gravity in a standard standingposition is below the hips, specifically in the area of the pelvis. This position gives the body stability and balance, enabling effective movement and control.

Thus, the correct option is D.

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Answer 2
Answer: The answer is A. Just above the belly button.

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Cliff divers at Acapulco jump into the sea from a cliff $30.7 m$ high. At the level of the sea, a rock sticks out a horizontal distance of $9.34 m$.The acceleration of gravity is $9.8 m / s ^{2}$. With what minimum horizontal velocity must the cliff divers leave the top of the cliff if they are to miss the rock? Answer in units of $m / s$.
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Volume of a Cube The volume V of a cube with sides of length x in. is changing with respect to time. At a certain instant of time, the sides of the cube are 7 in. long and increasing at the rate of 0.2 in./s. How fast is the volume of the cube changing (in cu in/s) at that instant of time?

Answers

The volume of the cube is changing at the rate of 29.4 in³/s.

Time derivative:

The rate of change of the sides of the cube is 0.2 in/s, which can be mathematically represented as :

(dx)/(dt)=0.2 \;in/s

Now the volume of the cube is given by:

V = x³

If we take the time derivative of the above equation then it gives the rate of change of volume with time, so:

(dV)/(dt)= (d)/(dt)x^3\n\n (dV)/(dt)= 3x^2(dx)/(dt)

At the instant x = 7 in, the rate of change of volume will be:

(dV)/(dt)= 3*7^2*0.2\;in^3/s\n\n(dV)/(dt)=29.4\;in^3/s

So the volume is changing at 29.4 cubic inches per second.

Learn more about differential equation:

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Answer:

Therefore the volume of cube is change at the 29.4 cube in./s at that instant time.

Explanation:

Formula

  • (dx^n)/(dx) =nx^(n-1)

Cube :

The volume of a cube is = side^3

The side of length is x in.

Then volume of the cube is (V) = x^3

∴ V = x^3

Differentiate with respect to t

(d)/(dt)(V)=(d)/(dt) (x^3)

\Rightarrow (dV)/(dt) =3x^2(dx)/(dt)....(1)

Given that the side of the cube is increasing at the rate of 0.2 in/s.

i.e (dx)/(dt) = 0.2  in/s.

And the sides of the cube are 7 in i.e x= 7 in

Putting (dx)/(dt) = 0.2  and  x= 7 in equation (1)

\therefore (dV)/(dt) =3 * 7^2 * 0.2  cube in./s

       =29.4 cube in./s

Therefore the volume of cube is change at the 29.4 cube in./s at that instant time.

What is uniform acceleration

Answers

Answer:

It means zero acceleration.

Explanation:

When a body moves with constant velocity then it is said to be there is no rate of change of velocity takes place because it is constant. So the acceleration becomes zero or uniform acceleration.

What is the kinetic energy of an object that has a mass of 30 kilograms and moves with a velocity of 20 m/s?A. 12,000 J
B. 6,000 J
C. 2,940 J
D. 5,880 J

Answers


           Kinetic Energy = (1/2) (mass) (speed)² .

Just take that formula, write "30" in place of 'mass', write "20" in place
of 'speed', then do the arithmetic on the right side and you'll have the
kinetic energy.  When all the measurements are in SI units, you can
do that.

(Don't forget about the  ' 1/2 ', and don't forget to square the speed.)
 

A line graph usually reveals a relationship between which factors

Answers

Answer:

variables on the horizontal and vertical axis (slope, outliers, +/- correlation, etc)

Explanation:

Read the following sentence: Hurricanes can cause a lot of damage because of high winds, rain, and storm surge. How would this sentence be corrected Select one of the options below as your answer:A. Hurricanes can cause a lot of damage, because of high winds, rain, and storm surge.B. Hurricanes can cause a lot of damage because, of high winds, rain, and storm surge.C. The sentence is correct as is.

Answers

Answer:

Choice C is correct: The sentence is correct as it is.

Explanation:

Let us go through each of the answer choices one by one.

Choice A: Hurricanes can cause a lot of damage, because of high winds, rain, and storm surge.

This sentence places inappropriate comma in the underlined region (..damage, because..) which interrupts the flow of the sentence. Thus this choice cannot be correct.

Choice B: Hurricanes can cause a lot of damage because, of high winds, rain, and storm surge.

This sentence places inappropriate comma in the underlined (...because, of...) region which interrupts the flow of the sentence. Thus this choice cannot be correct.

Choice C: The sentence is correct as is.

The original sentence uses comma's in the proper places—it uses them to list the causes of hurricane damage—and therefore it does not needs to be modified, and thus this choice is correct.

If sediment is pushed along the underside of a glacier, what would occur?

Answers

When sediment is pushed along the underside of the glacier, striations occur. Striations are "Scratches" that look like long, parallel grooves. This also shows the direction that the glacier has moved in. Sediment gets pushed along the underside due to the flowing of the glacier.

Answer:

Glacial Striations

Explanation:

Glacier is an erosion agent that transports and deposits sediments.

Due to the weight and gradual flow of a glacier, it carves along parts of the mass beneath it, these parts are known as sediments, this movement causes marks to appear on the land beneath it. These marks are called Glacial Striations.  
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