Enzo throws a rock horizontally with a speed of 12 m/s from a bridge. It falls for 2.28 s before reaching the water below with no appreciable air resistance. Just as the rock reaches the water, find
(a) the horizontal component of its velocity.
(b) the speed with which it is moving.
(a) 12 m/s (b) 25 m/s
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Far-ultraviolet rays have short wavelengths, low energies, and travel at the speed of sound
a. True b. False Indicate whether the statement is true or false
Two charged particles held near each other are released. As they move, the acceleration of each decreases. Therefore, the particles
a. Opposite signs. b. Same sign. c. Charges cannot be determined.
An electron has the same de Broglie wavelength as the wavelength of a 1.8 eV photon. What is the speed of the electron?
(melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J) A) 1,100 m/s B) 980 m/s C) 910 m/s D) 840 m/s E) 770 m/s
A race car moving with a constant speed of 60 m/s completes one lap around a circular track in 50 s. What is the magnitude of the acceleration of the race car?
a. 8.8 m/s2 b. 7.5 m/s2 c. 9.4 m/s2 d. 6.3 m/s2 e. 5.3 m/s2