A basketball player pushes down with a force of 50 N on a basketball that is inflated to a gauge pressure of 8.0 × 104 Pa. What is the diameter of contact between the ball and the floor?
A)
2.8 cm
B)
1.4 cm
C)
1.7 cm
D)
2.1 cm
E)
5.6 cm
A
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Two parallel wires run in a north-south direction. The eastern wire carries 15.0 A southward while the western wire carries 6.0 A northward. If the wires are separated by 30 cm, what is the magnetic field direction at a point between the wires at a distance of 10 cm from the western wire?
A. 3.0
T
B. 6.0T
C. 15T
D. 27T
E. 90T
Single-Slit Diffraction: A beam of light of wavelength 610 nm passes through a slit that is 1.90 µm wide. At what the angle away from the centerline does the second dark fringe occur?
A. 11.4° B. 9.35° C. 12.2° D. 39.9° E. 18.7°
What power contact lens is needed to correct for farsightedness where the uncorrected near point is 75 cm?
A) +2.7 D B) -2.7 D C) +5.3 D D) -5.3 D
A boat at anchor is rocked by waves whose crests are 40 m apart and with wave speed 10 m/s. These waves reach the boat once every
A) 400 s. B) 30 s. C) 4 s. D) 0.25 s.