Blog

With a force F acting on a mass, acting over time interval t, and over a displacement magnitude d in the direction of the force, the change in an object’s momentum is:

A cyclist is riding on a country road, down a huge hill into the holler. Which is true of the cyclist’s potential energy?

If an airplane manufacturer doubles the area of each window in a model, which describes the effect of the force on a window from air pressure?

A 5kg and a 10kg are free-falling near the Earth’s surface, with the Earth’s gravitational force the only force acting.  Which is true?

The atomic mass of a He atom is 4.  What is the mass of 3 x 10^23 atoms of such atoms in kg?

Which most closely describes refraction?

A ball initially has velocity in the positive direction.  It is struck by a bat, and reverses direction with the same speed.  Which is true of the CHANGE in the ball’s momentum over the interval it is struck by the bat? 

An hypothetical atom has atomic number 2 and atomic mass 2.  How many neutrons does it have?

Convert 1300 feet to miles (1 mile = 5280 feet).

2020 Hyundai Accent from second gear accelerates at a = 12 m/s2, speeding up while traveling along a straight line.  If the initial speed is 8 m/s, what is the speed after after 2.5 seconds?