At what distance could one theoretically distinguish two automobile headlights separated by 1.5 meters? Assume a pupil diameter of 0.50 cm and yellow headlights seen at the wavelength 5.0 × 10^?7 m. Assume eye fluid has an average n = 1.33
a. 6.0 km
b. 12 km
c. 9.0 km
d. 3.0 km
e. 16 km
e
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Water is sent from a firehose at 30.0 m/s at an angle of 30.0° above the horizontal. What is the maximum height reached by the water?
a. 7.50 m b. 11.5 m c. 15.0 m d. 19.0 m e. 30.0 m
A radar pulse sent out to an airplane at a distance of 20.0 km will return as an echo to the source in what time interval? (c = 3.00 × 10^8 m/s)
a. 33.3 × 10^-6 s c. 66.7 × 10^-6 s b. 133 × 10^-6 s d. 0.0333 × 10^-6 s
State Newton's third law of motion
What will be an ideal response?
Motional Emf: A long vertical wire carries a steady 70 A current. As shown in the figure, a pair of horizontal rails are 0.20 m apart. A 20-? resistor connects points a and b, at the end of the rails. A bar is in contact with the rails, and is moved by an external force with a constant horizontal velocity of 0.90 m/s to the right, as shown. The bar and the rails have negligible resistance. At the instant that the bar is 0.20 m from the wire, what are the induced current in the resistor and its direction through the resistor? (?0 = 4? × 10-7 T ? m/A)
A. 0.63 ?A, from a to b B. 0.63 ?A, from b to a C. 0.32 ?A, from a to b D. 0.32 ?A, from b to a E. 1.9 ?A, from b to a