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Q. A winter hiker's body generates heat at a rate up to an utmost value of 126 W. She is hiking on a brisk day in which the outdoor temperature is 9 °C, whilst wearing a jacket with goose down insulation. How thick should the jacket be so that she can maintain a normal body temperature? Assume her surface area for heat flow (the jacket) is 1.5m2 and that all of her body heat flows out through the jacket. (Suppose the thermal conductivity to be 0.025 W/m • K.)
Paul is what most people consider a "jock." He is the captain of both the football and wrestling team and he also plays hockey. Upon entering Mrs. Title's class she figured that he would not take course seriously nor would he excel in class. She p..
Find out the time that the arrow spends in the air.
You hold a spherical salad bowl 90 cm in front of your face with the bottom of the bowl facing you. The salad bowl is made of polished metal with a 35 cm radius of curvature. What is the image (your face's image) distance along the central axis fr..
How much sound power will strike the eardrum of an airport worker 15.3 m from the aircraft? (Use 1.9 10-2 m as the diameter of the ear.)
Question on constant speed
How does this number of calories compare with the number of calories required to vary the same gram of 100 degree C boiling water to 100 degree C steam.
An oil drop carries one excess electron and weighs 9.2 10-15 N. What electric field strength is necessary to suspend drop so it is motionless.
A stone is dropped from the roof of a building; 2.10s after that a second stone is thrown straight down with the initial speed of 18 m/s, and both stones hit the ground at the equal time. How long did it take for the first stone to hit the ground.
wheel A of radius rA = 11 cm is coupled by belt B to wheel C of radius rC = 20 cm. The angular speed of wheel A is increased from rest at a constant rate of 1.6 rad/s2. Find out the time needed for wheel C to reach an angular speed of 100 rev/min,..
What is the tension in the string.At one time, television sets used "rabbit-ears" antennas. Such an antenna consists of a pair of metal rods.
A mass of 1.60 kg stretches a vertical spring 0.335 m. If the spring is stretched an additional 0.164 m and released, how long does it take to reach the (new) equilibrium position again.
A very long solenoid with a circular cross section and radius r= 8.1cm with n= 1.90E+4 turns/m has a magnetic energy density uB= 5.70 mJ/m3. What is the current in solenoid.
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