Protons and neutrons are held together by the
A. strong nuclear force.
B. weak nuclear force.
C. electromagnetic force.
D. gravitational force.
A. strong nuclear force.
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A cross-flow heat exchanger having an overall heat transfer coefficient of 150 W/m^2?K is used to heat water from 25ºC to 100ºC at 3 kg/s. Exhaust gases at 250ºC and with a specific heat of 1.0 kJ/kgK are used to heat the water, and these gases leave at 130ºC. Assume both flows are unmixed. Then determine (a) the mass flow of the exhaust gases and (b) the surface area of the heat exchanger.
What will be an ideal response?
Spheres of Charge: A metal sphere of radius 10 cm carries an excess charge of +2.0 ?C. What is the magnitude of the electric field 5.0 cm above the sphere's surface? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 4.0 × 105 N/C B. 8.0 × 105 N/C C. 4.0 × 107 N/C D. 8.0 × 107 N/C E. 4.0 × 109 N/C
An object is placed to the left of a spherical mirror in front of the mirror. If the image of the object is formed on the right side of the mirror, which of the following statements must be true? (There could be more than one correct choice.)
A) The image is upright and the mirror must be convex. B) The image is inverted and real, and the mirror must be convex. C) The image is upright and the mirror must be concave. D) The image is upright and virtual. E) The mirror could be either concave or convex.
The WAI guidelines that you should use should use HTML to specify fonts.
Answer the following statement true (T) or false (F)