What is the de Broglie wavelength for a proton (m = 1.67 × 10^-27 kg) moving at a speed of 3.0 × 10^6 m/s? (h = 6.63 × 10^-34 J×s)
a. 0.33 × 10^-13 m
c. 0.66 × 10^-13 m
b. 1.3 × 10^-13 m
d. 2.0 × 10^-13 m
B
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Which of the following is NOT an example of the WAI guidelines for links and navigation?
A. Specify the target for the link clearly. B. Do not use color alone to identify links. C. Group related links together in navigation bars. D. To create a navigation system that prioritizes the publisher's needs.
A boulder rolls off of a very high cliff and experiences no significant air resistance. While it is falling, its trajectory is never truly vertical
A) True B) False
A 320-g air track cart is traveling at 1.25 m/s and a 270-g cart traveling in the opposite direction at 1.33 m/s. What is the speed of the center of mass of the two carts?
A) 2.80 m/s B) 0.0693 m/s C) 0.131 m/s D) 1.47 m/s E) 1.29 m/s
The acceleration of a ball as it rolls down a ramp is 4 m/s2 . The ball is referred to 2 s after it starts to roll. The acceleration in m/s2 after starting from rest is
a. 0 d. 8 b. 2 e. 16 c. 4