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In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this water is pumped into a holding tank. Assume that the efficiency of the overall system is 29.0% (that is, 71% of the incident solar energy is lost from the system). What collector area (in square meters) is necessary to raise the temperature of 400 L of water in the tank from 18°C to 41°C in 2.8 h when the intensity of incident sunlight is 780 W/m2? The specific heat of water is 4186 J/kg·K. The density of water is 1.00 g/cm3.
A point source is 180 cm below the surface of a body of a liquid (n = 1.33 ). Find the diameter (in meters) of the largest circle at the surface through which light can emerge from the liquid into the air
The loaded cab of an elevator has a mass of 3000kg and moves 216-m up the shaft in 23s at constant speed. At what average rate does the force from the cable do work on cab.
How to find out an initial speed of the bullet
Approx. 8% of body weight lies above the 5th cervical vertebral body. If an individual's mass is 66kg, what is the stress at that point in your vertebral column
A box of mass 72.0 kg is connected to a second box with a mass of 34.0 kg. find the magnitude of the tension in the string between the two boxes
The radius of the planet Saturn is 5.85x10 meters to the 7th power, and its mass is 5.68x10 kg to the 26th power. Find the density of Saturn
The flux through a hollow uncharged box is 69 Nm2/C. The box is a cube with length 20 cm. How much charge is inside the box
A 1.7-m length of horizontal pipe has a radius of 6.50 10-3 m. What is the pressure in the flowing water at the left end of the pipe
Most of us know intuitively that in a head-on collision between a large dump truck and a subcompact car, you are better off being in the truck than in the car. Why is this, find the average force on the truck driver from the seatbelt
Two steel juggling balls each carry a charge of 2.75 %u03BCC. What is the distance between the centers of the two balls?
A Carnot engine operating between a warmer unknown temperature and a reservoir of boiling helium at 1.76 K has an efficiency of 75%. What is the warmer temperature
A speed skater moving across frictionless ice at 8.80 hits a 4.20-m-wide patch of rough ice. What is her acceleration on the rough ice
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