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In very cold weather, a significant mechanism for heat loss by the human body is energy expended in warming the air taken into the lungs with each breath.
(a) On a cold winter day when the temperature is -20oC,what is the amount of heat needed to warm to internal body temperature(37°C) the 0.50 L of air exchanged with each breath? Assume that the specific heat capacity of air is1020 J /(kg.K) and that 1.0 L of air has a mass of 1.3 g.
(b) How much heat is lost per hour if the respiration rate is 20 breaths per minute?
while the tilt angle theta equals 75 degrees is held constant, the load is slowly lifted vertically by a winch until the length of the vertical cable is negligible, and the load mass effectively sits at the upper end of the beam.
There is a square with 4 charges. q3 is 3x10^-6 C and in the top left q4 is -2x10^-6 C and in the top right q2 is 2x10^-6 C and in the bottom left q1 is 4x10^-6 C and in the bottom left The distance between each charge on the outer edge of the squ..
An osprey's call is a distinct whistle at 2200 Hz. An osprey calls whereas diving at you, to drive you away from her nest. You hear call at 2220 Hz. How fast is the osprey approaching.
How much energy must be added to a bowl of 125 popcorn kernels in order for them to reach a popping temperature of 175celsious? assume that their initial temperature is 21 celsious, that specific heat capacity of popcorn is 1650 j/kgcelsious, and ..
A chair of weight 125 N lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of F = 35.0 N directed at an angle of 42.0 below the horizontal and the chair slides along the floor. Using Newton's laws, compute..
A 1.00-kg block of ice is placed against a horizontal spring that has force constant k = 175 N/m and is compressed 0.021 m. What is the speed of the block after it leaves the spring
A trolley that moves along a horizontal beam is acted upon by two forces as shown. (a) Knowing that a 5 25°, determine by trigonometry the magnitude of the force P so that the resultant force exerted on the trolley is vertical. (b) What is the cor..
Two pianos each sound the same note simultaneously, but they are both out of tune. On a day when the speed of sound is 347 m/s, How much time separates successive beats
What is the total negative charge, in coulombs, of all the electrons in a small 1.05g sphere of carbon? One mole of C is 12.0g, and each atom contains 6 protons and 6 electrons.
An oscillating block-spring system has a mechanical energy of 2.78 J, an amplitude of 6.73 cm, and a maximum speed of 4.12 m/s. find the spring constant and the mass of the block
Note the gravitational acceleration of equatorial sea level is g = 32.0088ft/s^2 and that its variation is 0.003ft/s^2/ 1000ft ascent. find the height in miles above its point for which g = 30.504 ft/s^2 and what is the weight of a 180lb man on top o..
An electric field of intensity 2.5 kN/C is applied along the x-axis. Calculate the electric flux through a rectangular plane 0.350 m wide and 0.70 m long if the following conditions are true.
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