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Question: You have probably seen people jogging in extremely hot weather and wondered "Why?" As we shall see, there are good reasons not to do this! When jogging strenuously, an average runner of mass 69.0kg and surface area 1.87m2produces energy at a rate of up to 1310W , 80.0% of which is converted to heat. The jogger radiates heat, but actually absorbs more from the hot air than he radiates away. At such high levels of activity, the skin's temperature can be elevated to around 33.0°C instead of the usual 30.0°C. (We shall neglect conduction, which would bring even more heat into his body.) The only way for the body to get rid of this extra heat is by evaporating water (sweating).
How many 750mL bottles of water must he drink after (or preferably before!) jogging for a half hour? Recall that a liter of water has a mass of 1.00kg.
Water flowing out of a horizontal pipe emerges through a nozzle is 0.48 cm. The speed of the water in the pipe is 0.62 m/s. Treat the water as an ideal fluid, and determine the absolute pressure of the water in the pipe.
The emissivity of the outer surface of the tank is 0.75, and the convection heat transfer coefficient on the outer surface can be taken to be 30 W/m2 · °C. Assume the average surrounding surface temperature for radiation exchange to be 15°C.
A snake is sunning itself on a rock. If the snake is 0.4 m long, what is the approximate amount of radiation it absorbs from the Sun in 15 min, Estimate the temperature in the Sun on the rock
A 0.46 kg particle has a speed of 8.0 m/s at point A and kinetic energy of 7.5 J at point B. What is the total work done on the particle
Define the term universe Name the three celestial coordinates. At what angle is the ecliptic tilted with respect to the celestial equator? What is the physical reason for this? What is the vernal equinox, and what does it have to do with the celes..
question the shells fired form an artillery piece have a muzzle speed of 150 ms and the target is at a horizontal
Find the first term, the common difference, and give a recursive formula for the arithmetic sequence.
The biochemistry that takes place inside cells depends on various elements, such as sodium, potassium, and calcium, that are dissolved in water as ions. What is the resistance of the ion channel
A Ball begins rolling at the left and has just suffient energy to climb up to point C, which is the top of the hill on the right
Two tiny, spherical water drops, with equal charges of -4.00 x 10-17 C, have a center-to-center separation of 1.4 centimeter. Find the magnitude of electrostatic force acting between them
For the stationary position shown, the residual tension in each spring is 200 N. Neglecting the mass of the springs, determine the speed of rotation at which the shoes commence to move radially outwards.
Air molecules in a warm room
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