A girl is sitting on the edge of a pier with her legs dangling over the water. Her soles are 80.0 cm above the surface of the water. A boy in the water looks up at her feet and wants to touch them with a reed. (nwater = 1.333.) He will see her soles as being
a. right at the water surface.
b. 53.3 cm above the water surface.
c. exactly 80.0 cm above the water surface.
d. 107 cm above the water surface.
e. an infinite distance above the water surface.
d
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A supersonic plane passes overhead at a speed of 500 m/s. If you hear the sonic boom (shock wave) 4.00 s after the plane is directly overhead, at what altitude is the plane flying? Assume the speed of sound in air is 340 m/s
A) 1.36 km B) 2.16 km C) 1.85 km D) 2.45 km E) The plane is not flying fast enough to produce a shock wave.
Light with a frequency of 8.70 × 1014 Hz is incident on a metal that has a work function of 2.80 eV. What is the maximum kinetic energy that a photoelectron ejected in this process can have?
(1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s) A) 8.7 × 10-19 J B) 3.1 × 10-19 J C) 1.3 × 10-19 J D) 2.4 × 10-19 J E) 4.5 × 10-19 J
Spiral and irregular galaxies have active star formation
a. True b. False Indicate whether the statement is true or false
What determines how rapidly a star burns up its fuel?
A. the temperature in its core B. its mass C. its luminosity D. the pressure in its core E. All of these choices are correct.