A ball with original momentum +2.0 kgm/s hits a wall and bounces straight back without losing any kinetic energy. The change in momentum of the ball is:
a. 0.
c. 4.0 kgm/s.
b. -4.0 kgm/s.
d. -8.0 kgm/s.
B
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A 3.0 cm tall statue is 24. cm in front of a concave mirror. The mirror radius of curvature is 20. cm. (a) Is the image real or virtual? (b) How far is the image from the mirror? (c) Is the image upright or inverted? (d) How high is the image?
What will be an ideal response?
What is a molecule?
A) a group of two or more atoms bound together B) a particle that is part of an atomic nucleus C) the smallest known particle in nature D) an atom that has lost or gained an electron so that it is electrically charged E) a form of an atom that has more or less neutrons than normal
The mass of Pluto is 1.31 × 1022 kg and its radius is 1.15 × 106 m. What is the acceleration of a freely-falling object at the surface of Pluto if it has no atmosphere? (G = 6.67 × 10-11 N ? m2/kg2)
A) 0.661 m/s2 B) 9.81 m/s2 C) 1.62 m/s2 D) 3.72 m/s2 E) 0.140 m/s2
A) Internal human body temperature is often stated to be normal at 98.6°F. What is this temperature on the Celsius and Kelvin scales?
(b) Gallium boils at 2205°C. What is the corresponding temperature in the Fahrenheit and Kelvin scales? (c) The boiling point of liquid nitrogen is 77.0 K. What is the corresponding temperature in the Fahrenheit and Celsius scales? What will be an ideal response?