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Even if a man shows no visible perpiration he still evaporates about 500 grams of water per day from his lungs.
a). How many calories of heat are removed by this evaporation?
b). What is the rate of heat loss in watts due to this process?
A boy standing on a 15-m ledge throws a 0.2-kg rock horizontally at 10 m/s. How far does the rock travel horizontally before the rock strikes the ground? (let g = 10 m/s2)
Two copper blocks, each of mass 1.00kg, initially have differenttemperatures, 20 degree celsius and 28 degree celsius. Estimate the entropy change of each block
A block of mass 3.0 kg slides toward the right on a frictionless surface with v0 = 7.5 m/s. What is the position xf where the block stops
Quentin is lifting a 10 kg dumbbell by pulling upward on it with a 108.1 N force. What is the acceleration of the dumbbell
A 69N box of clothes is pulled 8.9 m up a 30° ramp by a force of 100 N that points along the ramp. If the coefficient of kinetic friction between the box and ramp is 0.22, compute the change in the box's kinetic energy.
A 115 mCi radioactive tracer is made in a reactor. When delivered to a hospital 16 hours later its activity is 95 mCi. What is the tracer's half-life
In a circuit of two lamps in series, if the current through one lamp is 2 A, what is the current through the other lamp
a car decelerates uniformly and comes to a stop after 10 s. the cars average velocity during deceleration was 50 kmh.
A lightbulb is 48 cm from a convex lens, and its image appears on a screen located 31 cm on the other side of the lens. By how much is the image enlarged or reduced
Water (? = 1000 kg/m3) is flowing smoothly through a pipe of diameter of 5.0 cm at a speed of 0.25 m/s. Find the pressure in the upper segment of the pipe
By what percentage does the density of a bowling ball change (assuming it is a uniform sphere) when it is taken from room temperature (68F ) into the cold night air in Nome, Alaska (-40F ). Assume the ball is made out of a material that has a linear ..
An engine performs work as a function of time (t) according to the subsequent equation: W = a*t^5, where a is a constant. Find the time dependence of output power of this engine
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