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A 5-m = 6-m = 8-m room is to be heated by an electric resistance heater placed in a short duct in the room. Initially, the room is at 15°C, and the local atmospheric pressure is 98 kPa. The room is losing heat steadily to the outside at a rate of 200 kJ/min. A 200-W fan circulates the air steadily through the duct and the electric heater at an average mass flow rate of 50 kg/min. The duct can be assumed to be adiabatic, and there is no air leaking in or out of the room. If it takes 15 min for the room air to reach an average temperature of 25°C, find
(a) The power rating of the electric heater and
(b) The temperature rise that the air experiences each time it passes through the heater.
Some simple elemental superconductors (called type I) are perfect diamagnets, meaning that their internal magnetic field exactly cancels the applied field. What is the susceptibility of such superconductors
Force from crutches. A patient with a broken leg stands using a pair of crutches. The crutches support 75% of the 81 kg patient's weight. Find the force each crutch applies to the patient
An electron in the first excited state (n=2) of hydrogen. How many possible states of orbital angular momentum are there for the electron, How many Possible spin states are there for the electron
a points a and b have electric potentials of 255 v and 129 v respectively. when an electron released from rest at point
A point mass of m1 = 2.3 kg is placed at the origin. Masses m2 = 5.4 kg and m3 = 7.6 kg are placed at 3.5 m and -5.8 m on the x-axis, respectively. Find out the location on the x-axis of the center of mass.
A gas is allowed to expand isothermally until it reaches its final volume and its pressure is 2.97 atm. Find the heat absorbed by the gas during this process
A life preserver made of Styrofoam is designed to support a person weighing 575 N, Find the volume of Styrofoam required if the body's volume is 0.0503 m^3
A monatomic ideal gas at high temperature T in a discharge tube has a triply degenerate excited state at an energy e above the ground state, Find the ratio population of the excited state to that of the ground state
A 2000 kg satellite is in a circular orbit of radius 60,000 km from the center of the Earth. Determine the gravitational force on the satellite
A lawn roller in the form of a solid uniform cylinder is being pulled horizontally with a horizontal force B applied to an axle during the center of the roller. The roller radius 0.59 m and mass 48 kg.
How far away can a human eye distinguish two car headlights 1.8 m apart? Consider only diffraction effects and assume an eye pupil diameter of 5.5 mm and a wavelength of 550 nm. What is the minimum angular separation an eye could resolve when view..
A geode is a hollow rock with a solid shell and an air-filled interior. what fraction of the geode's volume is hollow
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