Most pulsars emit
A) visible light. B) gamma rays. C) X-rays. D) radio waves. E) nothing.
D
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The charge per unit length on an insulator is . On a 2.0-m length of this material, what is the difference in the number of electrons and the number of protons?
a. There are more electrons than protons. b. There are more protons than electrons. c. There are more protons than electrons. d. There are more electrons than protons.
Saturated liquid water flows through 2 cm ID stainless steel tubes at 200 g/s. The water is at 80ºC and the inside surface of the tubes is 200ºC. (a) Determine the convection heat transfer to the water per unit length of tube and (b) predict the convective heat transfer after ten years when the inside of the tubes is coated with a film so that the ID is now 1.9 cm and has a toughness of 0.2mm.
What will be an ideal response?
A wheel rotates about a fixed axis with a constant angular acceleration of 4.0 rad/s2. The diameter of the wheel is 40 cm. What is the linear speed of a point on the rim of this wheel at an instant when that point has a total linear acceleration with a magnitude of 1.2 m/s2?
A. 39 cm/s B. 42 cm/s C. 45 cm/s D. 35 cm/s E. 53 cm/s
If the temperature of 2.000 moles of an ideal gas is increased by 50
C then what is the increase in the total internal energy?
A. 1,247 J B. 1,980 J C. 2,250 J D. 2,750 J E. 3,030 J