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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.
if 5 capacitors each of 5 micro F are connected in series with 4 capacitors each of 4 uF capacitances in parallel. what is the the net capacitance
A region of space contains a uniform electric field oriented along the y-axis. How is the plane of second frame oriented with respect to the plane of the first one
Object A is metallic and electrically neutral. It is charged by induction so that it acquires a charge of -2.86E-6 C. Object B is identical to object A and is also electrically neutral.
A cardinal (Richmondena cardinalis) of mass 4.50×10?2 kg and a baseball of mass 0.144 kg have the same kinetic energy. What is the ratio of the cardinal's magnitude of momentum to the magnitude of the baseball's momentum?
An object has a kinetic energy of 303 J and the momentum of magnitude 22.9 kg·m/s. Find the speed and the mass of the object.
One of the problems of in-air testing of nuclear weapons (or, even worse, theuseof such weapons!) is the danger of radioactive fallout. what is the daughter nucleus
A high fountain of water is located at the center of a circular pool, A student walks around the pool and estimates its circumference to be 196 m. How high is the fountain
A rocket with mass 1000kg accelerates upwards at a rate of 20m/s (a) How long does it take before it is going at the speed of sound (334 m/s)? (b) How long does it take before the rocket is at a height of 100km?
Two identical cars collide head-on each traveling at 80 km/hr. Suppose that all their kinetic energy is transformed into thermal energy. What is the temperature increase of each car
A pinecone falls straight down from a pine tree growing on a 20 degree slope. What are the components of the pinecone's impact velocity parallel and perpendicular to the ground
An electromagnetic plane wave at a certain location has an electric field pointed up which is given as a function of time as E = 54 V/m x sin (6x10^6 Hz x t). how much energy does the foil absorb
A 110 turn square wire coil of area 0.040 m2 rotates about a vertical axis at 1700 rev/min, Calculate the maximum emf induced in the coil by the Earth's field
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