Which of the following is a feature of our solar system that should be predicted by a successful theory of solar system formation?
A) the age of our solar system
B) the fact that all the planets in our solar system orbit the Sun in the same direction
C) the fact that there are exactly four terrestrial planets and exactly four jovian planets
D) the fact that Earth has a 23-1/2° axis tilt
E) the fact that Jupiter has the most known moons in the solar system
B) the fact that all the planets in our solar system orbit the Sun in the same direction
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Red light has a lower energy per photon than blue light. Therefore, red light has
A) higher frequency, shorter wavelength than blue light. B) lower frequency, longer wavelength than blue light. C) lower frequency, shorter wavelength than blue light. D) higher frequency, longer wavelength than blue light.
Two lenses, the first with focal length 10.0 cm and the second with focal length -12.5 cm, are separated by 20.0 cm. An object, 2.40 cm tall, is 15.0 cm in front of the first lens. What is the size of the final image?
A. 2.40 cm B. 4.80 cm C. 12.4 cm D. 24.0 cm E. 0.96 cm
If the absolute temperature of an object is tripled, the thermal power radiated by this object (assuming that its emissivity and size are not affected by the temperature change) will
A) increase by a factor of 3. B) increase by a factor of 9. C) increase by a factor of 18. D) increase by a factor of 27. E) increase by a factor of 81.
Rotational Kinetic Energy: A solid uniform ball with a mass of 125 g is rolling without slipping along the horizontal surface of a table with a speed of 4.5 m/s when it rolls off the edge and falls towards the floor, 1.1 m below. What is the rotational kinetic energy of the ball just before it hits the floor?
A. 0.51 J B. 0.73 J C. 1.1 J D. 2.6 J E. This question cannot be answered without knowing the radius of the ball.