Imagine placing two long wires parallel to each other. If conventional currents flow through them in the directions shown, will the wires attract, repel, or exert no net force on each other?
A. Attract each other
B. Repel each other
C. Exert no net force on each other
B. Repel each other
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Pumice is a volcanic rock that floats, which means its density is
A) less than the density of water. B) equal to the density of water. C) more than the density of water. D) need more information.
What is the period of a satellite circling Mars 100 km above the planet's surface? The mass of Mars is 6.42 × 1023 kg, its radius is 3.40 × 106 m, and G = 6.67 x 10-11 N•m2/kg2
A) 1.75 hours B) 1.25 hours C) 1.15 hours D) 1.00 hours E) 1.45 hours
An opaque gray surface having reflectivity of 0.5 at 27ºC is exposed to irradiation of 1000 W/m^2. Air at 7ºC flows over the surface and the convective heat transfer coefficient is 15 W/m^2K. Determine the net heat transfer per unit area from the surface.
What will be an ideal response?
A nonconducting sphere of radius 10 cm is charged uniformly with a density of 100 nC/m3. What is the magnitude of the potential difference between the center and a point 4.0 cm away?
A. 12 V B. 6.8 V C. 3.0 V D. 4.7 V E. 2.2 V