Non-conservative forces can change the mechanical energy of a system
Indicate whether the statement is true or false
TRUE
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Matter Waves: An electron is accelerated from rest through a potential difference. After acceleration the electron has a wavelength of 880 nm. What is the potential difference responsible for the acceleration of the electron? (h = 6.626 × 10-34 J ? s, melectron = 9.11 × 10-31 kg, e = 1.6 10-19 C)
A. 1.9 × 10-6 V B. 1.7 × 10-6 V C. 2.2 × 10-6 V D. 2.5 × 10-6 V
The force of static friction between two surfaces is independent of the area of contact between the surfaces
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A particle is acted upon by only two forces, one conservative and one nonconservative and neither being a force of friction, as it moves from point A to point B. The kinetic energies of the particle at points A and B are equal if
a. the sum of the works of the two forces is zero. b. the work of the conservative force is equal to the work of the nonconservative force. c. the work of the conservative force is zero. d. the work of the nonconservative force is zero. e. None of the above.
A light ray is reflected by two mirrors that are perpendicular. The new direction of the ray is
A) 180° from the original direction. B) 135° from the original direction. C) 45° from the original direction. D) between 90° and 180° from the original direction. E) 90° from the original direction.