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A person takes about 20 breaths per minute with 0.5 litre of air in each breath. How much heat is removed per hour by the moisture in the exhaled breath if the incoming air is dry and the exhaled breath is fully saturated? Suppose that the water vapour pressure in the saturated exhaled air is 24 tort.
A radio-controlled car increases its kinetic energy from 8 J to 10 J over a distance of 5 m. What was the average net force on the car during this interval
A swimming duck paddles the water with its feet once every 1.6s, producing surface waves with this period. How far apart are the crests behind the duck
A large fraction of the ultraviolet (UV) radiation coming from the sun is absorbed by the atmosphere. The main UV absorber in our atmosphere is ozone, O 3 rm O_3. In particular, ozone absorbs radiation with frequencies around 9.38×1014Hz rm Hz..
A retired bank president can easily read the fine print of thefinancial page when the newspaper is held no closer than at arm'slength, What should be the focal length of an eye glass lens
1.9*10^20photons per second are emitted by a 70W lightbulb, the wavelength is 550nm. How many photons per second are entering the pupil
The current in a circuit is tripled with connecting a 500-ohm resistor in parallel with the resistance of the circuit. Decide the resistance of the circuit in the absence of the 500-ohm resistor.
A brick is initially 14.64 cm high and an aluminum can is initially 14.65 cm high. By how much must their temperatures be raised in order for the brick and the can to have exactly the same height?
Two vehicles A & 13 are traveling west and south, respectivelytoward the same direction where they collide and lock together.Before the collision A (total weight 900lb) is moving with a speedof 40mi/h and B (1200 lb) has a speed of 60 mi/h.
question when water freezes it expands about 8.73. what would be the pressure increase inside your automobile engine
the next two questions refire to the following scenario. Determine the horizontal velocity of the arrow
two point charges of 30 nc and -40 nc are held fixed on an x axis at the origin and at x 76 cm respectively. a
A child's toy consists of a m = 26 g monkey suspended from a spring of negligible mass and spring constant k. calculate the speed of the monkey in Ve m/s as it passes through equilibrium
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