What is the magnification of a magnifying glass of focal length 4.0 cm if the image is to be viewed by a relaxed eye with a near point of 25 cm?
A) 2.0
B) 3.0
C) 3.6
D) 4.0
E) 6.3
E
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An interaction between a large and a small elliptical galaxy that results in a large spiral and a small elliptical galaxy takes:
A) several thousand years. B) several hundred thousand years. C) several million years. D) several hundred million years. E) several billion years.
You can increase the temperature of a gas by compressing it
a. True b. False Indicate whether the statement is true or false
A rectangular loop (area = 0.250 m2) turns in a uniform magnetic field with B = 0.210 T. At an instant when the angle between the magnetic field and the normal to the plane of the loop is ?/2 rads and increasing at the rate of 0.530 rad/s, what is the magnitude of the emf induced in the loop?
a. 5.25E–2 V b. zero c. 2.78E–2 V d. 9.91E–2 V e. 1.47E–2 V
A 100-m long wire carrying a current of 4.0 A will be accompanied by a magnetic field of what strength at a distance of 0.040 m from the wire? (magnetic permeability in empty space µ0 = 4p × 10^-7 T×m/A)
a. zero c. 2.0 × 10^-5 T b. 1.6 × 10^-5 T d. 4.0 × 10^-5 T