How wide must a narrow slit be if the first diffraction minimum occurs at ±12° with laser light of 633 nm?
A. 3.0 × 10?6 m
B. 3.0 × 10?5 m
C. 6.1 × 10?6 m
D. 6 .1× 10?5 m
E. 1.5 × 10?6 m
Answer: A
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Rotational Dynamics: A cinder block of mass m = 4.0 kg is hung from a nylon string that is wrapped around a frictionless pulley having the shape of a cylindrical shell, as shown in the figure. If the cinder block accelerates downward at 4.90 m/s2 when it is released, what is the mass M of the pulley?
A. 2.0 kg B. 4.0 kg C. 6.0 kg D. 8.0 kg E. 10 kg
Which of the following best sums up current scientific thinking about the nature of dark matter?
A) Most dark matter probably consists of weakly interacting particles of a type that we have not yet identified. B) Dark matter consists primarily of a mysterious form of energy that is causing the expansion of the universe to accelerate. C) There is no longer any doubt that dark matter is made mostly of WIMPs. D) Dark matter probably does not really exist, and rather indicates a fundamental problem in our understanding of gravity.
The central core of the atom is called the ______________
Fill in the blank(s) with correct word
What is the fastest speed in the universe?
a. The speed of light. b. The speed of sound. c. 1.1620 × 10^4 mph. d. The speed of the world's fastest rocket ship. e. The speed of electrons in a wire.