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Liono4ka [1.6K]

3 years ago

11

Which of the following has mechanical energy? Car battery Compressed spring Glowing incandescent lightbulb Nucleus of uranium at

om

2 answers:

grandymaker [24]3 years ago

6 0

Answer:

the correct answer is the lightbulb

Explanation:

i took the assighnment and got it correct

almond37 [142]3 years ago

4 0

The answer to this is the lightbulb

You might be interested in

You are designing a ski jump ramp for the next Winter Olympics. Youneed to calculate the vertical height^ h from the starting ga

Ede4ka [16]

Answer:

$H = 50.5 m$

Explanation:

As we know by work energy theorem that work done by all forces is equal to change in kinetic energy

So we know that

$W_f + W_g = \frac{1]{2}mv_f^2 - \frac{1}{2}mv_i^2$

so we know that

$W_f = -4000 J$

$v_f = 30 m/s$

$v_i = 2 m/s$

$m = 86 kg$

now we have

$mgH - 4000 = \frac{1}{2}(86)(30^2 - 2^2)$

$86(9.81)(H) - 4000 = 43(900 - 4)$

$H = 50.5 m$

4 0

3 years ago

When the burner in a hot air balloon is turned on, the temperature of the air in the balloon ________ causing its volume to ____

Georgia [21]

<u>Answer</u>

Part 1) Increase

Part 2) expand

Part 3) rise

<u>Explanation</u>

When the air is heated the molecules gain kinetic energy and starts to collide with walls of the ballon making it to increase it size.

Thus the volume of the balloon expands. When this happens the balloon and its content becomes less dense and it rises.

5 0

3 years ago

Read 2 more answers

The shape of a sign gives you a clue about the information contained on the sign.

irakobra [83]

Yeah, like a stop sign. We know it is most likely a stop sign since it has 8 sides or is an octagon.
I hope I helped!

7 0

3 years ago

A car enters the freeway with a speed of 6.4 m/s and accelerates uniformly for 3000 m in 210 seconds. How fast is the car moving

dedylja [7]

Answer:

I dont know i just need the points

6 0

3 years ago

Leila is building an aluminum-roofed shed in her backyard to store her garden tools.The flat roof will measure 2.0 x 3.0m in are

IrinaK [193]

Answer: 0.0138 m^2 = 138 cm^2

Explanation:

The thermal expansion is the term use for the physical phenomena of dilation of the objects when they are exposed to changes in temperature.

The objects dilate when they are heated and contract when they are cooled.

The dilation is proportional to the change in temperatur.

For linear dilation, the proportionality constant is called linear dilation coefficient of the materials, it is named α and is measured in °C ^-1.

ΔL = α * Lo * ΔT, which means that the dilation (or contraction) is proportional to the product of the original length (Lo) and the change of temperature (ΔT).

There is also superficial dilation, for which the dilation is:

ΔA = β * Ao * ΔT, which means that the superficial dilation (or contraction) is proportional to the product of the original area (Ao) and the change of temperature (ΔT).

It is very interesting and important to solve problems that β = 2α, because regularly you will find the values of α for different materials and so, you just to multiply it times 2 to use β.

For this problem:

- Original area, Ao = area of the flat roof at - 10°C = 2.0m * 3.0m = 6.0 m^2.
- α for aluminum = 24 * 10^ -6 °C^-1.
- ΔT = 38°C - (-10°C) = 48°C

So, ΔA = 6.0m^2 * (2 * 24*10^-6 °C&-1) * 48°C = 0.0138 m^2

And that is the area that should stick out in summer to fit the structure during cold winter nights.

You can pass that number to cm^2 to grasp better the idea of this size:

0.0138 m^2 * (100 cm)^2 / m^2 = 138 cm^2

3 0

2 years ago