Marc attaches a falling 500-kg object with a rope through a pulley to a paddle wheel shaft. he places the system in a well-insulated tank holding 25 kg of water. when the object falls, it causes the paddle wheel to rotate and churn the water. if the object falls a vertical distance of 100 m at constant speed, what is the temperature change of the water? (1 kcal = 4 186 j, the specific heat of water is 4 186 j/kgc, and g = 9.8 m/s2)

4.68227 °C

Explanation:

= Mass of object = 500 kg

= Mass of water = 25 kg

c = Specific heat of water at 20°C = 4186 J/kg°C

h = Height from which the object falls = 100 m

g = Acceleration due to gravity = 9.8 m/s²

The potential energy and heat will balance each other

The temperature change in the water is 4.68227 °C

answer: the correct answer id option(d).

explanation:

snell's law refraction:

the angle of refraction =

the angle of incidence =

refractive index of air = = 1

refractive index of glycerol = 1.47

from the given options, the most closest answer to 63.72° is 65° of option (d).

answer: the direction of the wind is expressed as the direction from which the wind is blowing. for example, easterly winds blow from east to west, while westerly winds blow from west to east.

explanation: