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Seals may cool themselves by using thermal windows, patches on their bodies with much higher than average surface temperature. Suppose a seal has a 0.030m^2 thermal window at a temperature of 30 degrees Celsius. If the seal's surroundings are a frosty -19degrees celsius, what is the net rate of energy loss by radiation? Assume an emissivity equal to that of a human.
The rectangular gate CD shown in the figure is 1.8 m wide and 2 long. Assuming the material of the gate to be homogeneous and neglecting friction at the hinge C, determine weight of the gate necessary to keep it shut until the water level rises to..
What is the work completed by the block and tackle system?
a hydraulic jack has an in[put piston area of 2 cm^2 and an output piston area of 18 cm^2. What will be the pressure on the oil
A roach that runs for its life because you try to hit it with your physics book runs off the horizontal tabletop with a speed of 0.685 m/s, What will be the vertical component of the roach's velocity just before it hits the floor
The coil of a generator has a radius of 0.16 m. When this coil is unwound, the wire from which it is made has a length of 5.8 m. What is the peak emf of this generator
Consider a fusion reaction in which two deuterium nuclei fuse to form a tritium nucleus and a proton, How much energy is released in this reaction
A 1000 kg experimental rocket sled on a level frictionless rail is loaded wiht 50kg of propellant. It exhausts the propellant in a 20-s "burn". If rocket, initially at rest, moves at 150m/s after the burn, what impulse is experienced by the rocket..
Suppose a large conducting slab is polarized (one side is positive and the other is negative) What is the electric field force (E) inside the slab
The vertical displacement y(x,t) of a string stretched along the horizontal x-axis is given by y(x,t) = (6.00 mm) cos[(3.25 m-1)x - (7.22 rad/s)t]. What is the distance between adjacent crests of the wave
Niobium metal becomes a superconductor when cooled below 9 K. determine the maximum current a 1.95-mm-diameter niobium wire can carry and remain superconducting
The dipole is held perpendicular to a uniform electric field with field strength 980V/m , then released. What is the dipole's angular velocity at the instant it is aligned with the electric field?
A velodrome track is banked so that a bicycle traveling at 69.9 km/h will have no tendency to slip to either side when traveling on the path that has a radius of curvature of 54.0 m
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