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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.
A toy train is pushed forward and released at xi = 2.4 m with a speed of 1.4 m/s. What is the train's acceleration after its wheel begins to stick
One afternoon, you are playing on a wooden basketball court with a hula?hoop to amuse yourself. The hoop has a mass of 500g and a radius of 55 cm. What is the hoop's speed just before it hits the wall
When a Newton's ring apparatus is immersed in a liquid, thediameter of the eighth dark ring decreases from 2.92 cm to2.48cm. What is the refractive index of the liquid
make Use of Stefans law to calculate the total power. What is the magnitude and direction of the force she exerts on you.
Two friends are carrying a crate of mass 200 kg up a flight of stairs. The crate has length 1.25 m and height 0.500 m, What is the magnitude of the upper person's force
A train pulls away from a station with a constant acceleration of 0.40 m/s2. What is the minimum constant speed at which she can run
A child launches an air powered toy rocket up into the air giving it an initial velocity of 6m/s at an angle of 80degree above the horizontal. How long after the rocket is launched does it take for the rocket to hit the ground
q1. a particle in an infinite tube.a a particle with mass m and energy e is inside a square with tube infinite
Ash "the working bee" decides to gather pollen and in her quest flies 50 meters from a beginning point at 0° along the west and finds nothing. Determine the displacement and direction of the bee
Most of the blackholes observed by astronomers have masses equal to few solar masses (the result of the death of a high mass star) or have masses equal to several million solar masses. Calculate the Schwarzschild radius of a blackhole
A 24 g ice cube at its melting point is felled into an insulated container of liquid nitrogen. How much nitrogen evaporates if it is at its boiling point of 79 K and has a latent heat of vaporization of 200 kJ/kg? Suppose for simplicity that the spec..
A molecule of DNA (deoxyribonucleic acid) is 2.06 µm long. The ends of the molecule become singly ionized: negative on one end, positive on the other. The helical molecule acts like a spring and compresses 0.93% upon becoming charged. Decide the effe..
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