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A 1000-W iron is left on the iron board with its base exposed to the air at 20°C. The convection heat transfer coefficient between the base surface and the surrounding air is 35 W/m2· °C. If the base has an emissivity of 0.6 and a surface area of 0.02 m2, determine the temperature of the base of the iron.
The distance between retina and lens for a normal human eye is about 2.50 cm, and the pupil can vary in size from 2 mm to 8.0 mm. Find the range of f-numbers for the human eye
A mass of 20 kg is attached to a light string which is wrapped around a cylindrical spool of radius 10 cm and moment of inertia 2 kg.m^2. How long does it take to reach the floor
Suppose Fuzzy, a quantum-mechanical duck, lives in a world in which h = 2?J · s. Fuzzy has a mass of 1.80 kg and is initially known to be within a pond 1.00 m wide. What is the minimum uncertainty in the duck's speed
at 0s a 755 g mass at rest on the end of a horizontal springk 124nm is struck by a hammer which gives the mass an
A water-skier is being pulled by a tow rope attached to a boat. As the driver pushes the throttle forward, the skier accelerates, Determine the work done by the net external force acting on the skier
A plate carries a charge of -3.9 µC, while a rod carries a charge of +2.2 µC. How many electrons should be transferred from the plate to the rod, so that both objects have the same charge.
What are the advantages of placing capacitors in parallel?What are the disadvantages? What are the advantages of placing capacitors in series? Whatare the disadvantages?
the index of refraction for red light in water is 1.331 and that for blue light is 1.340. a ray of white light enters
A certain semiconductor device requires a tunneling probability of T=10^-5 for an electron tunneling through a rectangular barrier with a barrier height of Vo=0.4eV. Determine the maximum barrier width
A small object has a mass of 4.0 × 10-3 kg and a charge of -32C. It is placed at a certain spot where there is an electric field. When released, the object experiences an acceleration of 2.8 × 103 m/s2 in the direction of the +x axis. Decide the elec..
A horizontal force of 80 N acts on a mass of 6 kg resting on a horizontal surface. Calculate the total energy expended in the acceleration
bowler uses a 5-kg bowling ball. What is the weight of the bowling ball, What is the momentum of the ball
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