A proton (m = 1.7 × 10^-27 kg, q = +1.6 × 10^-19 C) starts from rest at point A and has a speed of 40 km/s at point B. Only electric forces act on it during this motion. Determine the electric potential difference VB - VA
a. +8.5 V
b. -8.5 V
c. -4.8 V
d. +4.8 V
e. -17 V
B
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Work: Find the net work done by friction on a box that moves in a complete circle of radius 1.82 m on a uniform horizontal floor. The coefficient of kinetic friction between the floor and the box is 0.25, and the box weighs 65.0 N.
A. 190 J B. 0 J C. 1800 J D. 370 J
Impulse: A 0.140-kg baseball is dropped from rest. It has a speed of 1.20 m/s just before it hits the ground, and it rebounds with an upward speed of 1.00 m/s. The ball is in contact with the ground for 0.0140 s. What is the average force exerted by the ground on the ball during the time of contact?
A. 2.00 N upwards B. 2.00 N downwards C. 22.0 N upwards D. 22.0 N downwards E. 0.00 N
What is the maximum number of 100-W lightbulbs you can connect in parallel in a 120-V home circuit without tripping the 20-A circuit breaker?
Which of the following is a weak base?
a. NH3 b. NaOH c. KOH d. Ca(OH)2