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A portable classroom is heated with small propane heating units with a capacity of 3 kW each. The portable classroom is occupied by 45 students, each dissipating 120 W, and is lighted by 10 light fixtures that dissipate 60W each. If the heat loss from the portable classroom is 15 kW, how many heating units are required to maintain the classroom at a temperature of 20 degrees celcius?
A proton beam in an accelerator carries a current of115µA. If the beam is incident on a target, how many protons strike the target in a period of 26.0s?
A parallel-plate capacitor is constructed with circular plates of radius 6.5×10?2 m . The plates are separated by 0.21 mm, find the value of the dielectric constant
A block M1 of mass 16.50 kg sits on top of a larger block M2 of mass 26.50 kg which sits on a flat surface. The kinetic friction coefficient between upper and lower block is 0.405. The kinetic friction coefficient between the lower block and the f..
An aluminum cylinder is suspended in an unknown fluid by a spring scale. Outside the fluid, the object weighs 20N. In the fluid it weighs 10N. what is the density of the fluid
In certain ranges of a piano keyboard, more than one string is tuned to the same note to provide extra loudness. For example, the note at 1.10 102 Hz has two strings at this frequency. If one string slips from its normal tension of 5.90 102 N to 5..
A boat clashed on something and fell to the ocean floor, a few years later a few researchers sent a robot and found out that the pressure at the same level as the boat was 413 atm. The density of the seawater was 1025 kg/m cubed. what is the depht of..
In the circuit on the right, a light bulb, two batteries, and five resistors are wired to form a circuit. For the following question, assume the color codes on resistors are not accurate (that is, use stated values) and assume each battery has 4.75 ?..
in a television set electrons are accelerated from rest through a potential difference of 24 kv. the electrons then
A laser beam produces light of wavelength 632.8 nm in vacuum. what is the index of refraction of the syrup solution
An alpha particle is moving at a speed of 5.0 × 105 m/s in a direction perpendicular to a uniform magnetic field of strength 0.040 T. What is the radius of the path of the alpha particle
A capacitor C stores charge Q when there is a potential difference V. When a potential difference of V + 12.5Volts is used, an extra 45.50 microC of charge is stored. What is the capacitance C.
question when two moles of hydrogen and one mole of oxygen react to form two moles of water the energy released is 485
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