Consider the solar system as a “system” of particles. Which of the below qualify as internal interactions (A) and which as external interactions (E)?
(a) The contact interactions between the earth and a car moving on the earth’s surface
(b) The gravitational interaction between the earth and the International Space Station
(c) The gravitational interaction between two planets
(d) The gravitational interaction between a given planet and the sun
(e) The magnetic interaction between the sun and the earth (both have magnetic fields)
(f) The gravitational interaction between the sun and the larger galaxy
(a) The contact interactions between the earth and a car moving on the earth’s surface - A
(b) The gravitational interaction between the earth and the International Space Station - A
(c) The gravitational interaction between two planets - A
(d) The gravitational interaction between a given planet and the sun - A
(e) The magnetic interaction between the sun and the earth (both have magnetic fields) - A
(f) The gravitational interaction between the sun and the larger galaxy - E
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A system consisting of a negatively-charged particle and an electric field
A. gains potential difference and kinetic energy when the charged particle moves in the direction of the field. B. loses electric potential energy when the charged particle moves in the direction of the field. C. gains kinetic energy when the charged particle moves in the direction of the field. D. gains electric potential energy when the charged particle moves in the direction of the field. E. gains potential difference and electric potential energy when the charged particle moves in the direction of the field.
A solid object has a volume density ?0 at a temperature of 315 K. The coefficient of volume expansion for the material of which it is made is 7.00 × 10-5 K-1
What will be its density (in terms of ?0 at a temperature of 425 K, assuming that it does not melt and that its thermal properties do not change with temperature?
Take the lens maker equation and show that a lens which has been turned around (surface 1 becomes 2 and 2 becomes 1 ) has the same focal length
What will be an ideal response?
Which of the following is a vector quantity?
a. Force b. Power c. Work d. Time e. None of these