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3 years ago

What is your favorite place to live

2 answers:

8 0

I loved living in California my family and friends live there and my family is kinda known there, also it has in and out which is really good. There are toher things to like the weather (I love the summer nights) and this beach I use to go to had a playground and the beach was amazing especially the waves but the water was a little cold for most people but to me it is a-okay :).

Gekata [30.6K]3 years ago

3 0

Florida. The beaches are great

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A boy on a bicycle is resting at the top of a hill. Then, he rides his bicycle

Andreas93 [3]

Answer:

Top: PE = max, KE = 0

Middle: PE = half, KE = half

Bottom: PE = 0, KE = max

Explanation:

The potential energy of an object is the energy possessed by the object due to its location; it is given by

$PE=mgh$

where

m is the mass of the object

g is the acceleration due to gravity

h is the height of the object from the ground

The kinetic energy of an object is the energy possessed by the object due to its motion; it is given by

$KE=\frac{1}{2}mv^2$

where

v is the speed of the object

Now we analyze the three situations for the boy on the bycicle:

Top of the hill: here h (the height) is maximum, so the potential energy is maximum, while the speed is zero, therefore the kinetic energy is zero.

Middle of the hill: here h (the height) is half of the initial value, therefore the potential energy is also half of the initial potential energy. According to the law of conservation of energy, the total mechanical energy (potential+kinetic) is constant: this means that also the kinetic energy is half of the initial potential energy.

Bottom of the hill: here h is zero, therefore the potential energy is now zero. As a result, all the mechanical energy has been converted into kinetic energy, therefore the kinetic energy is maximum and it is equal to the potential energy of the boy when he was at the top.

8 0

3 years ago

Eyeglasses bend light help the image form properly on the retina. The bending of light as it passes from one medium to another i

garri49 [273]

It's refraction....When light bends on passing from one medium to another is refraction !

3 0

4 years ago

Read 2 more answers

A lowly high diver pushes off horizontally with a speed of 2.00 m/s from the platform edge 10.0 m above the surface of the water

VladimirAG [237]

Answer:

(a) 1.6m

(b) 6.86m

Explanation:

This is a horizontal shooting problem, so we will use the following equations.

For horizontal distance x we use:

$x(t)=x_{0}+v_{0}t$

Where $x(t)$ is the horizontal distance at a time $t$ , $x_{0}$ is the initial horizontal position which in this case will be zero: $x_{0}=0$ . And $v_{0}$ is the initial speed: $v_{0}=2m/s$

So to solve (a):

(a) At what horizontal distance from the edge is the diver 0.800 s after pushing off?

we have that the time is: $t=0.8s$ so the horizontal distance is:

$x(0.8)=(2m/s)(0.8s)1.6m$

The answer for (a) is 1.6m

Now, to solve (b) we need the equation for vertical distance:

$y(t)=y_{0}-\frac{1}{2}gt^2$

Where $y(t)$ is the vertical distance at a time $t$ , $y_{0}$ is the initial vertical distance: $y_{0}=10m$ And $g$ is the gravitational acceleration: $g=9.81m/s^2$ }

(b) At what vertical distance above the surface of the water is the diver just then?

The time is the same as in the last question: $t=0.8s$

$y(0.8)=10m-\frac{1}{2}(9.81m/s^2)(0.8)^2$

$y(0.8)=10m-\frac{1}{2}(9.81m/s^2)(0.64s^2)$

$y(0.8)=10m-\frac{1}{2}(6.2784m)$

$y(0.8)=10m-(3.1392)$

$y(0.8)=6.86m$

the answer to (b) is 6.86m

(c) At what horizontal distance from the edge does the diver strike the water?

To solve (c) we first need to know how long it took to reach the height of the water, that is, for what time y = 0

Using $y(t)=y_{0}-\frac{1}{2}gt^2$

if $y(t)=0$

$0=10-\frac{1}{2}gt^2\\-10=-\frac{1}{2}gt^2\\20=gt^2\\\frac{20}{g}=t^2\\ \sqrt{\frac{20}{g}}=t$

and since $g=9.81m/s^2$

$t=\sqrt{\frac{20}{9.81} } =\sqrt{2.039}=1.43s$

At $t=1.43s$ the car hits the water, so the horizontal distance at that time is:

$x(t)=x_{0}+v_{0}t$

$x(1.43)=(2m/s)(1.43s)=2.86m$

the answer to (c) is 2.86s

6 0

3 years ago

Hey can you plz go visit www.innerg fitness and buy plz! Thanks alot

alex41 [277]

Answer:

sure I'll check it out

6 0

3 years ago

BEST ANSWER GETS BRAINLIEST! WORTH LOTS OF POINTS!!

Lelechka [254]

The energy is being converted to the water yet it isn't rising because the water is absorbing the heat not reflecting it. I think this is correct but I'm not sure. I would like to know the answer if you find out though.

6 0

3 years ago

Read 2 more answers