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An electric heater is used to heat a room of volume 66 m3. Air is brought into the room at 5°C and is completely replaced twice per hour. Heat loss through the walls amounts to approximately 860 kcal/h. If the air is to be maintained at 20°C, what minimum wattage must the heater have? (The specific heat of air is about 0.17 kcal/kg·C°.)
220 cm3 of hot tea at 89°C are poured into a very thin paper cup with 70 g of crushed ice at 0°C. Calculate the final temperature of the "ice tea"
light of wavelength 600 nm in air goes into a medium where the index of refraction is 1.73. what is the frequency of
A tennis ball with a speed of 11.9 m/s is thrown perpendicularly at a wall. what is the average magnitude of acceleration of the ball while it is in contact with the wall
A jogger generates heat energy at a rate of 808.2 W. If all this energy is removed by sweating, how much water must evaporate from the jogger's skin each hour
An iron tower in is 317 meters tall on a cold day (T = -9.9 degrees Celsius). What is its height of the tower on a hot day
Two identical waves each having an amplitude 0.02 m has a phase difference of ?/8 when they meet at a point. What is the amplitude of the resultant wave at this point? A string whose length is 1.0 m is fixed at both ends and vibrates according to the..
a man drops a rock into a well. a the man hears the sound of the splash 2.0 s after he releases the rock from rest. the
A projectile of mass 0.702 kg is shot straight up with an initial speed of 16.1 m/s. How high would it go if there were no air resistance
A 3.00-m-long, 400 kg steel beam extends horizontally from the point where it has been bolted to framework of a new building under construction. A 74 kg construction worker stands at the far end of the beam.What is the magnitude of the torque abo..
A solid lead sphere of volume 0.40m^3, dropped in the ocean, sinks to a depth of2.0*10^3 (about 1 mile), What is the change in volume of the sphere
A potential difference of 81 mV exists between the inner and outer surfaces of a cell membrane. The inner surface is negative relative to the outer surface. How much work is required to eject a positive sodium ion (Na+) from the interior of the ce..
The glass core of an optical fiber has an index of refraction 1.60.The index of refraction of the cladding is 1.48. What is the maximum angle a light ray can make
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