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3 years ago

A roller coaster at an amusement park goes from the top of a tall hill to the bottom. during this time, the roller coaster

Physics

1 answer:

Nikolay [14]3 years ago

4 0

There are a couple of things happening while the coaster goes from the top of the hill to the bottom:

The coaster loses gravitational potential energy.
The coaster's loss in potential energy becomes its gain in kinetic energy.
The coaster's gain in kinetic energy causes it to speed up.
Maybe the coaster is also losing some of its newly gained kinetic energy to friction due to contact between the coaster's internal components and air resistance.

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Cliff divers at Acapulco jump into the sea from a cliff 37.1 m high. At the level of the sea, a rock sticks out a horizontal dis

Stella [2.4K]

Answer:

$v_x = 4.87 m/s$

Explanation:

Height of the cliff is given as

$h = 37.1 m$

now the time taken by the diver to hit the surface is given as

$h = \frac{1}{2}gt^2$

$37.1 = \frac{1}{2}(9.8)t^2$

$t = 2.75 s$

Now in the same time it has to cover a distance of 13.39 m

so the speed in horizontal direction is given as

$v_x = \frac{x}{t}$

$v_x = \frac{13.39}{2.75}$

$v_x = 4.87 m/s$

3 0

4 years ago

If the speed of light in air is 3.00 times 10 to the 8 m/s power and the speed of light in water is 2.25 times 10 to the 8 power

kykrilka [37]

The refractive index is essentially the speed of light through a vacuum (extremely similar to air) divided by the speed of light through given medium.
I also attached some of my physics notes on refraction and that sort of jazz as they may help :)

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3 years ago

Which best explains how fiber-optic technology has improved communication?

Gelneren [198K]

Answer:

B. It has allowed for faster transmission of Internet signals.

Explanation:

i took the test on engenuity

8 0

3 years ago

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It is easier to see clothes with pointed needle than a blunt one

topjm [15]

Answer:

Explanation:

It is easier to see clothes with pointed needle than a blunt one because pressure exerted is more in a pointed needle as it occupies less space compared to blunt needle, A blunt has more surface area so the pressure exerted will less as compared to a pointed needle.

IF YOU FOUND MY ANSWER USEFUL THEN PLEASE MARK ME BRAINLIEST.

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3 years ago

How much heat energy is required to raise the temperature of 20 kilograms of water from 0°c to 35°c?

saveliy_v [14]

Energy required = Specific Heat × mass × change in temp.
Specific Heat (Cp) water = 4.186kJ/kgC 
Mass = 20kg 
Change in temperature = 35C - 0C = 35C 

Q = 4.186kJ/kgC × 20kg × 35C = 293.02kJ hope this helps! (:

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3 years ago

Read 2 more answers