Ocean tides are waves that have a period of 12 hours, an amplitude (in some places) of 1.50 m, and a speed of 750 km/hr. What is the distance between adjacent crests of these waves?
A) 9000 m B) 32,400 m C) 2500 m D) 32,400 km E) 9000 km
E
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A positive charge Q is located at the center of an imaginary Gaussian cube of sides a. The flux of the electric field through the surface of the cube is ?. A second, negative charge -Q is placed next to Q inside the cube
Which of the following statements will be true in this case? A) The net electric field on the surface of the cube is equal to zero B) The electric field on the surface of the cube is perpendicular to the surface C) The magnitude of the net electric field is constant on the entire surface of the cube D) The net flux through the surface of the cube is equal to zero E) The net flux through the surface is equal to 2?
Energy and Mass: How much mass is lost during a reaction in which 1.7 × 108 MeV of energy is released? (c = 3.0 × 108 m/s, 1 eV = 1.6 × 10-19 J)
A. 1.8 × 10-8 kg B. 5.7 × 10-9 kg C. 1.9 × 10-17 kg D. 3.0 × 10-22 kg
Why do we generally rule out stars with masses more than a few times that of the Sun when we consider star systems where life could be possible?
What will be an ideal response?
From the viewpoint of an alien astronomer, how does Jupiter affect observations of our Sun?
A) It causes the Sun to move in a small ellipse with an orbital period of about 12 years. B) It makes the Sun periodically get somewhat brighter. C) It makes the Sun appear dimmer when viewed with infrared light. D) It causes the Sun to move in a small ellipse in the sky, with the same ellipse repeated every night.