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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.
A multicylinder gasoline engine in an airplane, operating at 2.35 103 rev/min, takes in energy 7.83 103 J and exhausts 4.57 103 J for each revolution of the crankshaft. What is the torque exerted by the crankshaft on the load?
A car of mass 1440 kg traveling at 28 m/s is at the foot of a hill that rises 115 m in 3 kilometres. At the top of the hill, the speed of the car is 8 m/s. Discover the average power delivered by the car's engine, neglecting any frictional losses.
The current in an RL circuit drops from 0.80 A to 13 mAin the first second following removal of the battery from thecircuit. If L is 12 H, find the resistance R inthe circuit.
A 36-kg skier coasts up a snow-covered hill thats makes anangle of 25o with the horizontal. what is the magnitude of the kinetic frictional force
A 1.5-kg projectile is fired from level ground. The vertical component of the initial velocity is 65 m/s and the horizontal component is 29 m/s. Ignore air resistance and the curvature of the earth in this problem. How far in meters does the proje..
A ray of red light in air (wavelength=650nm) is incident on a semicircular block of clear plastic (n=1.51 for this light), Th ray strikes the block at its center of curvature at an angle of incident of 27 degrees. Determine the wavelength of the l..
Find the period of 2kg pendulum whose length is 1 m long if its amplitude is 2 cm and its angular amplitude is 0.02 rad
a projectile is at the highest point in its path. is its acceleration at this instant greater than less than or equal
A person stretches a rope of length 55 m between the top of a building to the base of a tree d = 23 m away. How tall is the building.
A(n) 331 g object is attached to a spring and executes simple harmonic motion with a period of 0.294 s. The total energy of the system is 1.7J. Find the force constant of the spring. (N/m) Find the amplitude of the motion (in cm)
a 13.5-kg box slides over a rough patch 1.75 m long on a horizontal floor. just before entering the rough patch the
Jeff of the Jungle swings on a 7.6- vine that initially makes an angle of 47 with the vertical. If Jeff starts at rest and has a mass of 88 , illustrate what is the tension in the vine at the lowest point of the swing?
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