Which of the lettered graphs below might also legitimately describe the potential energy for the same interaction (between the same two particles!) whose potential energy function is shown in the “original” graph in the upper left? In each case, the vertical axis is energy (increasing upward) and that axis crosses the horizontal axis where r = 0.
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Two projectiles are fired from ground level at equal speeds but different angles. One is fired at an angle of 30° and the other at 60°. Neglecting air resistance, the projectile to hit the ground first will be the one fired at
A) 30°. B) 60°. C) both hit at the same time
A ray in air is incident on a glass plate whose index of refraction is 1.42. The angle of refraction is one half the angle of reflection. The angle of refraction is closest to:
A) 45° B) 43° C) 41° D) 39° E) 37°
An empty spice bottle has an inner volume of 1.31 × 10^?4 m3 . It has a mass of 112 g when filled with air, and it displaces 1.63 × 10^?4 m3 of water when fully submerged. What volume of mercury (?Hg = 13.6 × 10^3 kg/m3) must be added to the empty bottle so that it will just submerge?
a. 3.75 cm3 b. 12.0 cm3 c. 101 cm3 d. 147 cm3 e. 237 cm3
Density: Concrete is sold by the cubic yard. What is the mass, in kilograms, of 1.00 cubic yard of concrete that is 5.00 times as dense as water? (1.00 m = 1.094 yd, a cubic meter of water has a mass of 1000 kg, and density is mass per unit volume.)
A. 764 kg B. 6550 kg C. 2420 kg D. 8730 kg E. 3820 kg