In a certain region of space, a uniform electric field is in the x direction. A particle with negative charge is carried from x = 20.0 cm to x = 60.0 cm. The electric potential energy of the charge-field system:
1.increases.
2.remains constant.
3.decreases.
4.changes unpredictably.
1
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The International Space Station is orbiting at an altitude of about 370 km above the earth's surface
The mass of the earth is 5.97 × 1024 kg, the radius of the earth is 6.38 × 106 m, and G = 6.67 × 10-11 N ? m2/kg2. Assuming a circular orbit, (a) what is the period of the International Space Station's orbit? (b) what is the speed of the International Space Station in its orbit? What will be an ideal response?
What are the shortest wavelength X-rays produced by a 50,000-V X-ray tube?
What will be an ideal response?
The oldest rocks that have been dated by radioactivity are approximately
A) 2 million years old. B) 200 million years old. C) 4 billion years old. D) 10 billion years old.
In a partially stabilized zirconia-calcia chemical sensor, the electrical conductivity is due primarily to:
(a) Electron flow in the conduction band (b) Hole diffusion in the valence band (c) Oxygen ion diffusion (d) Zirconium ion diffusion