According to the universal law of gravitation, if you triple the distance between two objects, then the gravitational force between them
A) increases by a factor of 9.
B) decreases by a factor of 9.
C) decreases by a factor of 3.
D) increases by a factor of 3.
B
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A car with good tires on a dry road can decelerate (slow down) at a steady rate of about 5.0 m/s2 when braking. If a car is initially traveling at 55 mi/h
(a) how much time does it take the car to stop? (b) what is its stopping distance? What will be an ideal response?
In straight-line motion, if a moving object speeds up, the direction of the acceleration is ______________ the direction of the velocity
Fill in the blank(s) with correct word
The most common form of lightning strike from a cloud to the ground involves negative charge moving from the cloud to the ground. Just before a lightning strike,
A. the electric field must point toward the sky. B. the potential must be larger near the cloud. C. there are no charges on the ground. D. the potential energy of the electrons in the cloud must be small.
To be dimensionally consistent, distance [L], velocity [L/T], and acceleration
must be related as follows.
A. 
B. distance = velocity/acceleration
C. 
D. 