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Animals in cold climates often depend on two layers of insulation: a layer of body fat [of thermal conductivity 0.200W/(m dot K) ] surrounded by a layer of air trapped inside fur or down. We can model a black bear (Ursus americanus) as a sphere 1.60{\rm m} in diameter having a layer of fat 4.10{cm} thick. (Actually, the thickness varies with the season, but we are interested in hibernation, when the fat layer is thickest.) In studies of bear hibernation, it was found that the outer surface layer of the fur is at 2.60C during hibernation, while the inner surface of the fat layer is at 31.1C Part A What should the temperature at the fat-inner fur boundary be so that the bear loses heat at a rate of 50.0{W} ? Part B How thick should the air layer (contained within the fur) be so that the bear loses heat at a rate of 50.0{W} ?
What is the speed of the wave?
An proton (m = 1.67 ´ 10-27 kg and q = 1.6 ´ 10-19 C) travelling at 2.7 × 105 ms-1 enters a magnetic field of 1.2 T at right angles to the direction of motion of the electron. What is the centripetal force on proton.
A 1.050 kg air-track glider is attached to each end of the track by two coil springs. Find the effective spring constant of the system
The cooper windings of a motor Have a resistance of 55 ohms at 20 degrees C when the motor is idle. What is the temperature in degrees Of the windings
A curve of radius 52.6 m is banked so that a car of mass 1.6 Mg traveling with uniform speed 55 km/hr can round the curve without relying on friction to keep it from slipping on the surface
After the collision, the 0.177 kg puck has a speed of 1.38 m/s at an angle of 27? to the positive x axis. Examine the velocity of the 0.302 kg puck after the collision.
A block of mass m = 2.0 kg attached to a spring with spring constant k on a frictionless surface. The block is pushed to the left to position x = -0.5 m and, at time t = 0, it is released from rest and starts oscillating with a period of 2.0 s.
Suppose you have to move a heavy crate of weight 875 N by sliding it along a horizontal concrete floor. What is the magnitude Fp of the minimum force you need to exert on the crate to make it start sliding along the floor
An engine of an aircraft propeller delievers an amount of power 171 hp to the propeller at the rotational velocity of 2360 rev/min, How much torque does the aircraft engine provide
A Dodge Caravan begins rolling from rest. Its tires undergo a constant of angular acceleration of 0.34 rad/s^2, What is angular speed of each tire after 3 revolutions
A freezer of resistance 9.6 is connected to a 123.3 V source. What is the power delivered when this freezer is on
question1a 23-g bullet travelling 285ms penetrates a 4.5kg block of wood and emerges cleanly at 230ms. if block is
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