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3 years ago

When a fan is turned on it changes electrical energy into what?

Physics

1 answer:

ankoles [38]3 years ago

8 0

When you turn on a fan its electrical energy changes into kinetic energy

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Help Newton’s laws of motion!!!

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Newton’s 3rd law of motion

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If the Sun, Earth, and Moon are lined up as shown above, then the Earth would have...

lbvjy [14]

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What are the three primary particles that make up an atom, and

Lyrx [107]

Answer:

Protons, Electrons, and Neutrons are the 3 primary particles in an atom.

Protons - (+1)

Electrons - (-1)

Neutrons - (0)

<h3>Your answer would be C</h3>

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3 years ago

A projectile is launched straight up from a height of 960 feet with an initial velocity of 64 ft/sec. Its height at time t is h(

Natasha2012 [34]

Answer:

a) $t=2s$

b) $h_{max}=1024ft$

c) $v_{y}=-256ft/s$

Explanation:

From the exercise we know the initial velocity of the projectile and its initial height

$v_{y}=64ft/s\\h_{o}=960ft\\g=-32ft/s^2$

To find what time does it take to reach maximum height we need to find how high will it go

b) We can calculate its initial height using the following formula

Knowing that its velocity is zero at its maximum height

$v_{y}^{2}=v_{o}^{2}+2g(y-y_{o})$

$0=(64ft/s)^2-2(32ft/s^2)(y-960ft)$

$y=\frac{-(64ft/s)^2-2(32ft/s^2)(960ft)}{-2(32ft/s^2)}=1024ft$

So, the projectile goes 1024 ft high

a) From the equation of height we calculate how long does it take to reach maximum point

$h=-16t^2+64t+960$

$1024=-16t^2+64t+960$

$0=-16t^2+64t-64$

Solving the quadratic equation

$t=\frac{-b±\sqrt{b^{2}-4ac}}{2a}$

$a=-16\\b=64\\c=-64$

$t=2s$

So, the projectile reach maximum point at t=2s

c) We can calculate the final velocity by using the following formula:

$v_{y}^{2}=v_{o}^{2}+2g(y-y_{o})$

$v_{y}=±\sqrt{(64ft/s)^{2}-2(32ft/s^2)(-960ft)}=±256ft/s$

Since the projectile is going down the velocity at the instant it reaches the ground is:

$v=-256ft/s$

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3 years ago

(Please help me this needs to be done ASAP )

butalik [34]

The answer is B thank me later !

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3 years ago