Kepler's First Law of planetary motion states that
A) an imaginary line joining the Sun and planet sweeps out equal areas in equal times
B) the further a planet is from the Sun, the faster it moves in its orbit
C) the orbits of planets are ellipses
D) the further a planet is from the Sun, the slower it moves in its orbit
C
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A horizontally-projected beam of electrons travelling at 55 km/s travels between two parallel plates between which there is an electric field. The beam travels exactly horizontally the whole time it is between the plates. What does this imply about the electric field between the plates?
A. It is 0. B. It is 56 pV/m upward. C. It is 56 pV/m downward. D. It doesn’t imply anything in particular.
Measuring the Doppler shift of material at various distances from the center of a galaxy can be used to construct a(n) ____________________ for that galaxy
Fill in the blank(s) with correct word
A block lies on a horizontal frictionless surface. A horizontal force of 100 N is applied to the block giving rise to an acceleration of 3 m/s2
(a) Determine the mass of the block. (b) Calculate the distance the block will travel is the force is applied for 10 s. (c) Calculate the speed of the block after the force has been applied for 10 s.
The determination of the composition of a material by bombarding it with neutrons and monitoring the emitted radiation is neutron activation analysis
a. True b. False Indicate whether the statement is true or false