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4 years ago

7

The question is how does the heat move through the space between the sun and earth? Match the heat transfer mechanism in space a

nd on earth with the correct discription.
PLEASE HELP IM RUNNING OUT OF TIME

1 answer:

Neporo4naja [7]4 years ago

7 0

Heat goes from sun to earth by way of electromagnetic radiation ... infrared is pretty warm stuff.

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Gravel is being dumped from a conveyor belt at a rate of 30 cubic feet per minute. It forms a pile in the shape of a right circu

Alona [7]

Answer:

dh/dt = 0.0566 feet / min

Explanation:

Volume per second, dV/dt = 30 cubic feet per minute

Diameter of cone = height of cone = h

at h = 15 feet, dh/dt = ?

Volume of cone is

V = πr²h

where, r be the radius of cone

According to question

radius of cone = half of diameter of cone = h /2

So,

$V=\pi \times \left ( \frac{h^{2}}{4} \right )\times h$

$V=\pi \times \frac{h^{3}}{4}$

Differentiate both sides with respect to h

$dV/dh = \frac{\pi }{4}\times 3h^{2}\times \frac{dh}{dt}$

by substituting the values

$30=\frac{3\times3.14}{4}\times 15\times 15\times \frac{dh}{dt}$

dh/dt = 0.0566 feet / min

7 0

4 years ago

1)the car's engine power is 44000W. Explain this number in a physical sense

Ratling [72]

Answer:

1) It expresses the rate (top speed) at which it can move with time.

2) P = 20 W

3) h = 18 km

Explanation:

1) Power is the rate of transfer of energy.

⇒ Power = $\frac{Energy(or workdone)}{Time}$

i.e P = $\frac{E}{t}$

Thus a car's engine power is 44000W implies that the engine of the car can propel the car at this rate. This expresses the rate (top speed) at which it can move with time.

2) m = 400g = 0.4 kg

t = 20 s

h = 100m

g = 10 m/ $s^{2}$

P = $\frac{mgh}{t}$

= $\frac{0.4*10*100}{20}$

= $\frac{400}{20}$

P = 20 W

3) u = 600 m/s

g = 10 m/ $s^{2}$

From the third equation of free fall,

$V^{2}$ = $U^{2}$ - 2gh

V is the final velocity, U is the initial velocity, h is the height.

0 = $(600)^{2}$ - 2 x 10 x h

0 = 360000 - 20h

20h = 360000

h = $\frac{360000}{20}$

= 18000

h = 18 km

The maximum height of the bullet would be 18 km.

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3 years ago

What is light intensity?

Stels [109]

Answer:

Light intensity refers to the strength or amount of light produced by a specific light source .

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3 years ago

How far apart must two protons be if the electrical force acting on either one is equal to its weight on the earth's surface whe

BARSIC [14]

Answer:

G M m / R^2 = F force of attraction for proton

K e^2 / r^2 = F force of attraction between 2 protons

G M m / R^2 = K e^2 / r^2

r^2 = K e^2 R^2 / (G M m)

r^2 = 9E9 * (1.6E-19)^2 * (6.37E6)^2 / (6.67E-11 * 5.98E24 * 1.7E-27)

r^2 = 9 * 2.56 * 40.6 / (6.67 * 5.98 * 1.7) * 10^-19

r^2 = 1.38 * 10^-30

r = 1.17E-15 m

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3 years ago