For Example Problem 2-26, estimate the temperature drop at the contact surface if the heat transfer is reduced to 3 Btu/hr?ft^2.
What will be an ideal response?
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A rectangular loop (area = 0.15 m2) turns in a uniform magnetic field with B = 0.20 T. At an instant when the angle between the magnetic field and the normal to the plane of the loop is (?/2) rad and increasing at the rate of 0.60 rad/s, what is the magnitude of the emf induced in the loop?
a. 24 mV b. zero c. 18 mV d. 20 mV e. 6.0 mV
A charge of 12 C passes through an electroplating apparatus in 2.0 min. What is the average current through the apparatus?
A) 0.10 A B) 0.60 A C) 1.0 A D) 6.0 A
Diverging lenses have negative focal lengths
Indicate whether the statement is true or false
Most experts believe that, for safe disposal, high-level nuclear wastes should be buried for
A) 100,000 to 1 million years. B) a few million years. C) 100 to 500 years. D) 1000 to 10,000 years. E) as long as humans remain on Earth.