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A family is considering replacing their hot water heater. Aconventional electric hot water heater is $200 includinginstalation. his brother and his wife now move in and they estimatethat a family of four uses an average of 300 liters of hot water aday, which will require $350 worth of electricity each year. Theinstalled cost of small solar water heater system is $1,400 andwill cost $60 per year on the average to operate(electricity topump the water through the panels and to augment solar heating oncloudy days. Both systems will have a $0 salvage value at the endof their useful lives. Based on a MARR of 12%, determine how long the soalr system must operate to make it as economical as theelectric system.
A coil has an inductance of 7.0 mH, and the current in it changes from 0.16 A to 1 A in 0.15 s. Discover the magnitude of the average induced emf in the coil during this period.
A position-time graph for an object moving in the - dir'n and accelerating from a low velocity to a high velocity is shown below. If the object is moving in the - dir'n, then the slope of a p-t graph would be -. If the object is changing velocity fro..
What is decrease in kinetic energy throughout the collision.
Cylinder 2 is attached to the ceiling and rotates without friction, and cylinder 1 hangs vertically. If M1 = M2, when the cylinders are released from rest and the tape unwinds off both cylinders, what is the acceleration of the center-of-mass of c..
Two loudspeakers emit sound waves along the x-axis. The sound has maximum intensity when the speakers are 25 cm apart. The sound intensity decreases as the distance between the speakers is increased, reaching zero at a separation of 35 cm.
Your friend is diving in ocean water whose refractive index is different from pure water. Compute the refractive index of the ocean water
A nearsighted person cannot read a sign that is more than 6.0 m from his eyes. What is the focal length of the contacts?
An object is placed in front of a thin lens at a distance of 7.00 cm, and the lens produces an inverted image that is twice the size of the object. (a) Is the image height positive or negative?
A 10 kilogram piece of metal (specific heat of .04 cal/g.oC) having a temp of 87oC is added to .3 kilogram of water having a temp of 23oC. Estimate the final equilibrium temp of the system
Gayle runs at a speed of 4m/s and dives on a sled, initially at rest on the top of a frictionless snow covered hill. After she has descended a vertical distance of 5m, her brother.
Two polarizers are oriented at 38 degrees to one another. Light polarized at a 19 degree angle to each polarizer passes during both. What percent reduction in intensity takes place?
The distance between the eyepiece and the objective lens in a certain compound microscope is 12.7 cm. The focal length of the objective is 0.540 cm, determine the overall magnification of the microscope
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