# Physics

The sun outputs 1380 W/m^2 of energy at the earth's surface. A small rectangular las has the following dimensions: 1km wide, 1.4km long, and 300m deep

A) Calculate the thermal energy added to the lake if exposed to 12h of direct sunlight.

B) calculate the increase in temperature of the lake, assuming the temperature is even throughout.

1. 👍 0
2. 👎 0
3. 👁 116
1. Q =q•W•L•t= 1380•1000•1300•12•3600= =7.75•10¹³ J
Q=cmΔT
ΔT= Q/cm = Q/cρV=7.75•10¹³/4180•1000•1000•1300•300=
=0.048 K

1. 👍 0
2. 👎 0
posted by Elena

## Similar Questions

1. ### physics

The sun is 1.5 1011 m from the earth. (a) Over what surface area is solar radiation spread at this distance? (b) What is the total power radiated by the sun? (The sun delivers energy to the surface of the earth at a rate of

asked by JOHN on April 9, 2012
2. ### Science

"Most of the solar radiation is absorbed by the atmosphere and much of what reaches the earth's surface is radiated back into the atmosphere to become heat energy." What can you conclude about heat energy? Most of the sun's energy

asked by JImmy on February 22, 2018
3. ### astrophysics

1) Every second the Sun outputs 3.90* 10^26 Joules of energy. Power is energy output per unit time and is given in units of Watts (W) where 1 W = 1 Joule per second. The Sun's power output is therefore 3.90*10^26 Watts. This is

asked by Easha on November 24, 2009
4. ### astrophysics

1) Every second the Sun outputs 3.90* 10^26 Joules of energy. Power is energy output per unit time and is given in units of Watts (W) where 1 W = 1 Joule per second. The Sun's power output is therefore 3.90*10^26 Watts. This is

asked by Easha on November 24, 2009
5. ### physics

the rate at which radiant energy from the sun reaches the earth's upper atmosphere is about 1.50kW/m2. the distance from the earth to the sun is 1.50*10^11m, and the radius of the sun is 6.96 * 10^8m. if the sun radiates as an

asked by jean on May 7, 2017
6. ### Science

Which statement correctly describes the sun and earth? a. the sun and earth both have water. b. the sun and earth both have a surface called the crust. c. the sun and earth both have an atmosphere d. the sun and earth both have

asked by Aisha on March 9, 2017
7. ### math

Hi, Nearly all of the energy used on earth comes originally from the sun, and that solar radiation is intercepted at 1370 Wm^-^2 at the top of the atomsphere, and that 49%of this radiation is absorbed by the earths surface. If a

asked by carl on December 5, 2008
8. ### Physics

The surface of the Sun is approximately 5700 K and the temperature of the Earth's surface is about 290 K. What total entropy change occurs when 1000 J of heat of energy is transferred from the Sun to the Earth?

asked by P on November 19, 2012
9. ### physics

the energy received by the earth from the sun is 1400w/m2. Assuming that the sun is a black body radiator and the ratio of the radius of the earth's orbit to the sun's radius is 216. Calculate the surface temperature of the sun.

asked by frank fred on April 16, 2012
10. ### Physics

the temperature at the surface of the sun is approximatly at 5700K and the temperature at the surface of the earth is approxiamtly 290 K. what entropy change occurs when 1100 J of energy is transfered by radiation from the sun to

asked by jenn on February 2, 2010

More Similar Questions