How many zodiacal constellations are there?
A. 24
B. 88
C. 13
D. 12
Answer: C. 13
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A rectangular wire loop (length = 60 cm, width = 40 cm) lies completely within a perpendicular and uniform magnetic field of magnitude of 0.5 T. If the length of the loop starts increasing at a rate of 20 mm/s at time t = 0, while the width is decreasing at the same rate, what is the magnitude of the induced emf at time t = 4.0 s?
a. 6.8 mV b. 5.2 mV c. 3.6 mV d. 8.4 mV e. 10 mV
A 4000-? resistor is connected across 220 V. What current will flow?
A) 0.055 A B) 1.8 A C) 5.5 A D) 18 A E) 550 A
Which of the effects listed below is not a major effect influencing the binding energy of the nucleus in the liquid-drop model?
a. The volume effect: the binding energy per nucleon is approximately constant when A > 50. b. The surface effect: nucleons in the surface have fewer neighbors. c. The quantum number effect: all nucleons in the nucleus have the same set of quantum numbers. d. The Coulomb repulsion effect: protons repel protons. e. The symmetry effect: stable nuclei tend to have N ? Z.
The block shown in the figure has mass =7.0 kg and lies on a fixed smooth frictionless plane tilted at an angle theta=22.0 degrees to the horizontal.
(a) Determine the acceleration of the block as it slides down the plane.
(b) If the block starts from rest 12.0 m up the plane from its base, what will be the block’s speed when it reaches the bottom of the incline?
