An object, located 90 cm from a concave lens, forms an image 30 cm from the lens on the same side as the object. What is the focal length of the lens?
a. -150 cm
c. -36 cm
b. -45 cm
d. -180 cm
B
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Cosmic rays impinging upon the earth will generally ____
a. be deflected by the earth's gravitational field b. not be affected if they are electrically neutral c. be weaker in intensity at the earth's poles d. lead to lightning discharges in the atmosphere
Four identical particles (mass of each = 0.40 kg) are placed at the vertices of a rectangle (2.5 m × 4.0 m) and held in those positions by four light rods which form the sides of the rectangle. What is the moment of inertia of this rigid body about an axis that passes through the mid-points of the shorter sides and is parallel to the longer sides?
a. 2.2 kg×m2 b. 2.8 kg×m2 c. 2.5 kg×m2 d. 3.1 kg×m2 e. 1.6 kg×m2
The wavelength of an electromagnetic wave is 600 nm. What is its frequency? (c = 3.0 × 108 m/s)
A) 200 × 1012 Hz B) 300 × 1012 Hz C) 400 × 1012 Hz D) 500 × 1012 Hz E) 600 × 1012 Hz
A 12.0 V battery is placed across a 4.00
resistor. If the current through the resistor is 2.80 A, what is the internal resistance of the battery?
A. 0.200
B. 0.290
C. 4.29
D. 3.71
E. 0.800