A proton (mass = 1.67 × 10^?27 kg, charge = 1.60 × 10^?19 C) moves from point A to point B under the influence of an electrostatic force only. At point A the proton moves with a speed of 60 km/s. At point B the speed of the proton is 80 km/s. Determine the potential difference VB ? VA
a. +15 V
b. ?15 V
c. ?33 V
d. +33 V
e. ?20 V
b
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A book rests on a table, and the table rests on the ground. Which of the following pairs of forces forms a force pair, or action-reaction pair, obeying Newton's law of force pairs?
A) Gravity pulling down on the table and the book pushing down on the table. B) The ground pushing up on the table and the book pushing down on the table. C) The table pushing up on the book and the book pushing down on the table. D) Gravity pulling down on the book and the book pushing down on the table. E) Gravity pulling down on the book and the table pushing up on the book.
A 12-g bullet moving horizontally strikes and remains in a 3.0-kg block initially at rest on the edge of a table. The block, which is initially 80 cm above the floor, strikes the floor a horizontal distance of 120 cm from its initial position. What was the initial speed of the bullet?
a. 0.68 km/s b. 0.75 km/s c. 0.81 km/s d. 0.87 km/s e. 0.41 km/s
Branch lengths in the tree of life are a measure of the
A) rate of evolution between different species B) size difference between species C) life expectancy difference between species D) amount of genetic difference between different species
How does the heat energy from the Sun reach us through the vacuum of space?
a. conduction b. radiation c. convection d. none of the above choices are valid