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Nadusha1986 [10]

3 years ago

12

When the Sun is directly overhead, the intensity of sunlight reaching the ground is about 1000 W/m^{2} 2 . The Earth has a radiu

s of about 6400 km. What is the total power associated with sunlight shining on the Earth?

1 answer:

Hunter-Best [27]3 years ago

6 0

Answer:

The total power associated with sunlight shining on the Earth is 8.04 × 10^10W

Explanation: Please see the attachment below

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Physics question 28 plz help me

Alexus [3.1K]

Answer:

a. I = 30 A

b. E = 1080000 J = 1080 KJ

c. ΔT = 12.86°C

d. Cost = $ 4.32

Explanation:

a.

The current in the coil is given by Ohm's Law:

$V = IR\\I = \frac{V}{R}$

where,

I = current = ?

V = Voltage = 120 V

R = Resistance = 4 Ω

Therefore,

$I = \frac{120\ V}{4 \Omega}\\$

<u>I = 30 A</u>

<u></u>

b.

The energy can be calculated as:

$E = VIt\\E = (120\ V)(30\ A)(5\ min)(\frac{60\ s}{1\ min})\\$

<u>E = 1080000 J = 1080 KJ</u>

<u></u>

c.

For the increase in the temperature of water:

$E = mC\Delta T\\$

where,

m = mass of water = 20 kg

C = specific heat of water = 4.2 KJ/kg.°C

Therefore,

$1080\ KJ = (20\ kg)(4.2\ KJ/kg.^oC)\Delta T$

<u>ΔT = 12.86°C</u>

<u></u>

d.

First, we will calculate the total energy consumed:

$E=(Power)(Time)\\E=VI(Time)\\E = (120\ V)(30\ A)(0.5\ h/d)(30\ d)\\E = 54000\ Wh\\E = 54 KWh$

Now, for the cost:

$Cost = (Unit\ Cost)(Energy)\\Cost = (\$ 0.08\KWh)(54\ KWh)$

<u>Cost = $ 4.32</u>

7 0

3 years ago

A 41.0 kg child swings in a swing supported by two chains, each 2.98 m long. (a) If the tension in each chain at the lowest poin

Alex777 [14]

Answer:695.5 N

Explanation:

mass of child $m=41 kg$

Length of chain $L=2.98 m$

Tension in each chain $T=348 N$

(a)Tension at bottom point $T=348 N$

At lowest Point

$T+T-mg=\frac{mv^2}{L}$

$2T-mg=\frac{mv^2}{L}$

$2\times 348-41\times 9.8=\frac{41\times v^2}{2.98}$

$v^2=\frac{294.2\times 2.98}{41}$

$v=\sqrt{21.38}=4.62 m/s$

(b)Force exerted by Seat will be Equal to Normal reaction

$N-mg=\frac{mv^2}{L}$

$N=mg+\frac{mv^2}{L}$

$N=41\times 9.8+\frac{41\times 21.38}{2.98}$

$N=695.95 N$

8 0

3 years ago

What scientific instrument is sensitive enough to detect a planet transiting a star on the Kepler Spacecraft?

siniylev [52]

<h3>SCIENTIFIC INSTRUMENT</h3>

==============================

$\large \sf \underline{Question:}$

What scientific instrument is sensitive enough to detect a planet transiting a star on the Kepler Spacecraft?

==============================

$\large \sf \underline{Answer:}$

$\qquad \qquad\huge \bold {Photometer}$

==============================

$\large \sf \underline{Explanation:}$

A photometer is an instrument that measures and quantifies the brightness of a celestial body.

==============================

<h3>Mutual Information:</h3>

brainly.com/question/17246738

==============================

6 0

2 years ago

A 52–newton bird feeder is tied to a cord, which is attached to a tree branch. Describe the tension force of the rope.

ziro4ka [17]

Hi, thank you for posting your question here at Brainly.

When the object is at equilibrium and the object is just freely hanging from the cord, then the summation of forces along the y direction would just be the tension of the cord and the weight of the object. Since both forces are opposite in direction, at equilibrium, they are equal. Hence, in this case, the tension is also equal to 52 N.

3 0

3 years ago

Read 2 more answers

Plz answer right now

tangare [24]

sun and comet also meteroid

6 0

4 years ago