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3 years ago

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A nuclear power plant, a hydroelectric dam, a coal burning power plant have what in common? A) They are all sources of fuel. B)

They are all sources of electricity. C) They are all sources of natural resources. D) They all turn solar energy in to chemical energy.

2 answers:

Rudik [331]3 years ago

7 0

B) They are all sources of electricity

Hope it helps!!

Lapatulllka [165]3 years ago

4 0

<span>B) They are all sources of electricity</span>

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What is the mass of a crate if a force of 200 N causes it to accelerate at 8 m/s2? (Formula: F=ma)

Ugo [173]

25 kg

Explanation:

we can calculate the mass of the crate by using the Newton's second law:

$F=ma$

where

F is the force acting on the crate

m is the mass

a is the acceleration

In this problem, $F=200 N$ and $a=8 m/s^2$ , so we can re-arrange the equation above to calculate the mass of the crate:

$m=\frac{F}{a}=\frac{200 N}{8 m/s^2}=25 kg$

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At the end of a bike ride up a mountain, Chris was at an elevation of 500 meters above where he started. If Chris's mass is 60kg

lawyer [7]

294000J

Explanation:

Given parameters:

Height of hill = 500m

Mass of Chris = 60kg

Unknown:

Potential energy increase = ?

Solution:

Potential energy is the energy by virtue of the position of a body.

Potential energy = mgh

m is the mass of the bike

g is the acceleration due to gravity

h is the height

At the base of the hill,

P.E = mgh = 60 x 9.8 x 0 = 0J

At the top:

P.E = mgh = 60 x 9.8 x 500 = 294000J

Potential energy increase = 294000J - 0J = 294000J

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The driver of a car traveling 110 km/h slams on the brakes so that the car undergoes a constant acceleration, skidding to a comp

Ber [7]

Answer: $-6.80\ ms^{-2}$

Explanation:

We know that the formula for acceleration is given by:

$a=\dfrac{v-u}{t}$ , where v = Final velocity

u= Initial velocity

Given : The driver of a car traveling 110 km/h slams on the brakes so that the car undergoes a constant acceleration.

i.e. u= 110 km/h $=\dfrac{110\times1000}{3600}\approx35.6\ m/s$ [∵ 1 km= 100 meters and 1 hour = 3600 seconds]

v= 0 m/s ( At brake , final velocity becomes 0)

t=4.5 seconds

Substitute all the values in the formula , we get

$a=\dfrac{0-30.56}{4.5}\approx-6.80\ ms^{-2}$

Hence, the average acceleration of the car during braking is $-6.80\ ms^{-2}$ .

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An underwater scuba diver sees the Sun at an apparent angle of 43.0° above the horizontal. What is the actual elevation angle of

Inessa05 [86]

Answer:

The actual elevation angle is 12.87 degrees

Explanation:

In the attachment you can clearly see the situation. The angle of elevation as seen for the scuba diver is shown in magenta, we conclude that $\theta_2=90-43=47$ .

Using Snell's Law we can write:

$n_1\sin(\theta_1)=n_2\sin(\theta_2)$

$\implies \sin(\theta_1)=\frac{n_2}{n_1}\sin(\theta_2)$ ,

Let's approximate the index of refraction of the air (medium 1 in the picture) to 1.

We thus have:

$\sin(\theta_1)=n_2\sin(\theta_2)=1.333\sin(47)$

$\implies\theta_1=\arcsin[n_2\sin(\theta_2)]=\arcsin[1.333\sin(47)]\approx 77.13$ . Calling $\alpha$ the actual angle of elevation, we get from the picture that $\alpha=90-77.13=12.97$

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tigry1 [53]

tanya is dumb j j j j j j j j j jj j j j

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