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4 years ago

When a roller coaster climbs up a hill, its potential energy?

Physics

2 answers:

german4 years ago

6 0

Answer: The potential energy of the roller coaster increases while climbing up a hill.

Explanation:

Potential energy of the body is defined as the energy of the body due to its position .It is calculated by the formula:

P.E = mgh

Potential energy increase with increase in mass of the body and also increases with increase in the height of the body or the distance between the body and earth surfaces .

So, when the roller coaster climb up the hill the distance between the earth surface and roller coaster increases due to which potential energy also increases.

BaLLatris [955]4 years ago

3 0

Wow, this is a good question. I'm going to go with B, it increases. Thanks! You strained my brain! :D

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How much work is done when a 4.0-newton box is carried horizontally a distance of 2.0 meters at a constant velocity?

monitta

Answer: Work done by the box will be 8 Joules.

Explanation:

Work done by a substance is the product of the force applied on it and the displacement of a substance.

Mathematically,

$W=F.s$

Where,

W = work done = ? J

F = Force applied = 4 N

s = displacement = 2 m

Putting values in above equation, we get:

$W=4N\times 2m=8Nm=8J$

Hence, work done by the box will be 8 Joules.

4 0

3 years ago

Read 2 more answers

A car is traveling at a speed of 15m/s. It experiences an acceleration of -3m/s^2, that lasts for 4 seconds. What is the final v

Gemiola [76]

Answer:

27m/s

Explanation:

u=15m/s

a=3m/s^2

t=4s

v=u+at

v=15+3(4)

v=27m/s

6 0

3 years ago

Assume that in 2010 the United States will need 2.0×1012 watts of electric power produced by thousands of 1000 MW power plants.

Alex73 [517]

Answer:

1752.14 tonnes per year.

Explanation:

To solve this exercise it is necessary to apply the concepts related to power consumption and power production.

By conservation of energy we know that:

$\dot{P} = \bar{P}$

Where,

$\dot{P} =$ Production of Power

$\bar{P} =$ Consumption of power

Where the production of power would be,

$\dot{P} = m \dot{E}\eta$

Where,

m = Total mass required

$\dot{E} =$ Energy per Kilogram

$\eta =$ Efficiency

The problem gives us the aforementioned values under a production efficiency of 45%, that is,

$\dot{P} = \bar{P}$

$m \dot{E}\eta = \bar{P}$

Replacing the values we have,

$m(8*10^13)(0.45) = 2*10^{12}$

Solving for m,

$m = \frac{ 2*10^{12}}{(8*10^13)(0.45)}$

$m = 0.0556 \frac{kg}{s}$

We have the mass in kilograms and the time in seconds, we need to transform this to tons per year, then,

$m = 0.556\frac{kg}{s}*(\frac{3.1536*10^7s}{1year})(\frac{1ton}{1000kg})$

$m = 1752.14$ tonnes per year.

8 0

3 years ago

Electromagnetic spectrum, i need help putting them in order. And maybe get a little help understanding this subject

umka2103 [35]

Explanation:

In order from highest to lowest energies the parts of electromagnetic spectrum are named as

Gamma rays,

X-rays,

ultraviolet radiation,

visible light,

infrared radiation,

and radio waves.

Microwaves are a subsections of radio waves. They are used in microwave ovens to heat the food items.

This is expected EM spectrum in field of science.

3 0

3 years ago

A diver initially moving horizontally with speed v dives dives offthe edge of a vertical cliff and lands in the water a distance

Aliun [14]

Answer:

Option C is correct

Explanation:

"The time is determined by the vertical distance. The formula is sqr(2d/a) = t. There still is no acceleration in the horizontal direction."

For the first drive

d = d

t = sqr(2d/a)

r = v

For the Second drive

d = ??

t = sqr(2d/a)

r = 2v

Since the times are same, equate the results.

t = d/v = d1/2v

v*d1 = 2v*d The v's cancel because they are related.

d1 = 2d.

You go twice as far as you did before.

Option C is correct

7 0

4 years ago