In size and mass, irregular galaxies tend to be ________ than spirals
Fill in the blank(s) with correct word
smaller
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What does E0 = mc 2 describe?
a. The kinetic energy of an object of mass m moving at speed v. b. The kinetic energy of an object of mass m moving at speed c. c. The equivalence of mass and energy. d. The form taken by Newton's second law at relativistic speeds. e. The relativistic mass.
Which of the following is characteristic of mountain stream valleys?
A) They are curvy and slow moving. B) They are V-shaped and have rapids. C) They have deltas. D) They are deep and wide.
Velocity Selector: A beam of electrons is accelerated through a potential difference of 1.0 kV before entering a velocity selector. If the magnetic field of the velocity selector has a magnitude of 0.010 T, what magnitude of the electric field is required if the electrons are not to be deflected as they pass through the velocity selector? (e = 1.60 × 10-19 C, melectron = 9.11 × 10-31 kg)
A. 5.9 × 103 V/m B. 1.9 × 105 V/m C. 6.0 × 105 V/m D. 7.2 × 106 V/m E. 1.1 × 105 V/m
How large should a wall-mounted mirror be to view the upper half of one's height, h?
a. h b. h/2 c. h/4 d. The answer is not given.