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Masteriza [31]
3 years ago
8

A car starts at the top of a hill with 200 J of energy, and rolls down a frictionless surface. The isolated system consists of t

he car, hill, and earth. What happens to the energy of the system as the car moves down the hill?
The total energy stays the same but is converted from being stored as kinetic energy into elastic potential energy as it moves.

The total energy stays the same but is converted from being stored as gravitational potential energy into kinetic energy of the car as it moves.

The total energy decreases and is converted from being stored as gravitational potential energy into kinetic energy as it moves.

The total energy decreases and is converted from being stored as elastic potential energy into kinetic energy as it moves.
Physics
1 answer:
Kamila [148]3 years ago
6 0

Answer:

The total energy stays the same but is converted from being stored as gravitational potential energy into kinetic energy of the car as it moves.

Explanation:

the law of conservation of energy states that the total energy of an isolated system remains constant, and since it is gaining speed that energy will be kinetic

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Give examples of not useful high friction
Tatiana [17]
Friction can be bad by being too strong or too weak. 

<span>Sometimes, when it is too strong, it decreases efficiency since some energy is wasted and turns to heat. Friction can also d</span><span>amage equipment/objects like when you slide it on the floor.
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When friction is too weak, like for instance when there is black ice- our center of gravity is displaced too quickly and we can fall. Likewise, if there is a lot of slush on the ground, cars can slip and slide.
6 0
3 years ago
You are asked to find a set of dimensionless parameters to organize data from a laboratory experiment, in which a tank is draine
mihalych1998 [28]

Answer:

Step 1

Given: A tank is drained through an orifice from initial liquid level (h₀). The time(r), to  drain the tank, depends on tank diameter (D), orifice diameter (d), acceleration due to gravity (g), liquid density (ρ) and liquid viscosity  (μ).

r = f (h₀, D, d, g, ρ, μ)

Step 2

There are totally seven parameters r, h₀, D, d, g, ρ and μ

∴ n = 7

The primary variables are M, L, T

∴ m = 3

So, the number of repeating variables are, r = 3

Select the three repeating variables are ρ, d, g

Then according to Buckingham, there will be n-m (⇒ 7-3 = 4) dimensionless groups given by π₁, π₂, π₃ and π₄

So, The number of π terms = 4

Explanation:

See attached images for step 3 to 7

6 0
2 years ago
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topjm [15]
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4 0
3 years ago
What is Newton's 3rd Law of Motion? *
Alexandra [31]

Answer:

For every action, there is an equal and opposite reaction. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects.

Explanation:

Every force sent into an object will sent a force in return.

If you smack a table, you can feel the table "push back"

3 0
3 years ago
Read 2 more answers
Use differentials to estimate the amount of metal in a closed cylindrical can that is 10 cm high and 4 cm in diameter if the met
ira [324]

The amount of metal in a closed cylindrical can that is 10 cm high and 4 cm in diameter if the metal on the top and the bottom is 0.1 cm thick and the metal on the sides is 0.05 cm thick is 8.8 cm.

The formula for calculating the volume of a cylinder is given below.

V = πr^2 h

Get the differential of the volume as shown:

dV = V/ h dh + V / r dr

V/ h = πr^2

V/ h  = 2  πr h

Now, the differential becomes

dV =  πr^2dh +  2πrh dr

Given the following parameters i.e. diameter and height

dh = 0.1 + 0.1 = 0.2 cm

dr = 0.05 cm

h = 10 cm

d = 4 cm  

r = 2cm

Substituting the values in the above equation, we get

dV = 3.14(2)^2(0.2)  + 2(3.14)(2)(10)(0.05)

dV = 2.512 + 6.28

dV = 8.792 cm

dV = 8.8 cm

If you need to learn more about diameter click here:

brainly.com/question/16813738

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4 0
1 year ago
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