A ball rolled along a horizontal surface maintains a constant speed because
A) its velocity remains constant.
B) no horizontal force acts on it.
C) of inertia.
Answer: B
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A ball is thrown vertically into the air. Because of air resistance, its speed when it returns to its starting level compared with its initial speed is
A) less. B) the same. C) more.
The Balmer series of emission lines from hydrogen lie in the ________ part of the EM spectrum
a. near infrared b. infrared c. visible d. ultraviolet
An alpha particle (charge = +2e) is sent at high speed toward a gold nucleus (charge +79e). What is the electrical force acting on the alpha particle when it is at a distance of 2 × 10^-14 m away from the gold nucleus? (e = 1.6 × 10^-19 C)
Length Contraction: The figure shows a right-angled construction frame ABC. When measured at rest, it has dimensions as follows: AB = 26.0 m, AC = 10.0 m, and BC = 24.0 m. This frame is now given a new velocity of 0.760c, relative to Earth, in a direction parallel to AC. How long is part AC of this frame with the new velocity as measured by Earth-based engineers?
A. 6.50 m B. 25.4 m C. 24.3 m D. 23.7 m E. 24.9 m