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4 years ago

How does potential and kinetic energy change in to each other and back again?

1 answer:

6 0

They can change because the law of conservation of energy allows it to happen, for example when you are sitting, your body is at a potential energy state, meaning you are inert, you are not moving, but when you get up and suddenly start walking or running, that energy is converted to kinetic energy, meaning that you are moving and can be changed back into potential energy if all of a sudden you stop running or walking to rest or sit down. This is just an example of how energy can are transferred multiple ways

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An elevated water tank holds 1 million gallons of water. Determine the force (in lbf) that the tower structure must be able to w

bixtya [17]

Answer:

8,345,925 lb-f

Explanation:

We know pressure P = F/A = ρgh ⇒ F = ρghA = ρgV

F = ρgV where F = force, ρ = density of water = 1000 kg/m³ , g = acceleration due to gravity = 9.8 m/s² and V = 1 × 10⁶ gallons = 1 × 10⁶ gallons × 1m³/264.2 gallons = 3785 m³

So, F = ρgV = 1000 kg/m³ × 9.8 m/s² × 3785 m³ = 37,093,000 N

We now convert Newtons to pound-force.

1 N = 0.225 lb-f

So, F = 37,093,000 N = 37,093,000 N × 0.225 lb-f/1 N = 8,345,925 lb-f

So, the tower must be able to withstand 8,345,925 lb-f

5 0

3 years ago

What is the mass of a person who weighs 653 N at earths surface

miss Akunina [59]

Answer:

66.6 kg

Explanation:

The weight of a person at Earth's surface is given by

$W=mg$

where

m is the mass of the person

$g=9.8 m/s^2$ is the acceleration of gravity

The person in the problem has a weight of

W = 653 N

Therefore, we can rearrange the equation to find his mass:

$m=\frac{W}{g}=\frac{653}{9.8}=66.6 kg$

7 0

4 years ago

A 4 kg block is pulled with 5.6 N of force to the right. The block experiences 1.1 N of friction. What is the acceleration of th

BARSIC [14]

Answer:

The acceleration of the box is 1.125 m/s² towards right.

Explanation:

Mass of the box, $m=4$ kg

Force acting towards right, $F=5.6$ N

Frictional force acting towards left, $f=1.1$ N

Let the acceleration be $a$ m/s².

Now, net force acting on the box towards right is given as:

$F_{net}=F-f=5.6-1.1=4.5\textrm{ N}$

From Newton's second law of motion,

$F_{net}=ma\\4.5=4a\\a=\frac{4.5}{4}=1.125\textrm{ }m/s^2$

Therefore, the acceleration of the box is 1.125 m/s² towards right.

7 0

4 years ago

Why are rift zones common placed for igneous rock to form

Vinil7 [7]

Igneous rocks are formed from molten rock cooling. Rift zones are a common place for them to form because there is two tectonic plates connecting which is a common place for volcanoes to form.

6 0

4 years ago

According to Newton's first law, if an object is slowing down, what must be happening?A.No forces are acting on it.

ira [324]

According to Newton's first law of motion, if the net force acting on an object is zero, the object remains at rest, or if the object is already moving, continues to move in a straight line with constant speed. Galileo realized the motion of an object doesn't change until an unbalanced force acts on it.

5 0

3 years ago

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