What is the force that is acting against gravity when things fall to the ground from thousands of feet above sea level?

How could you increase the potential energy of this apple

a. A rectangular pen is built with one side against a barn. 1900 m of fencing are used for the other three sides of the pen. What dimensions maximize the area of the pen? b.

When an atom that has no charge loses two electrons, it becomes a positive ion. negative ion. positive isotope. negative isotope.

What is the universal gravitational constant. I need to know because I am getting different answers from everyone

Hansel pushes a 2 lb. box 5 feet in 20 seconds. How much work has he done?

A projectile is launched over a horizontal surface in such a manner that its maximum height is 3/5 of its horizontal range. Determine the launch angle.

Two identical capacitors are arranged in a circuit. What is the ratio of the equivalent capacitance of the circuit when the capacitors are in series to that when they are in parallel?

A car's position in relation to time is plotted on the graph. What is the car's average velocity for segment C? A) - 4 m/s B) - 0.25 m/s C) 0.25 m/s D) 4 m/s

What percent of my Iodine-131 sample will be left after 7 half-lives?

A 58.0 kg snow skier is on the top of 351 m high hill. After she has gone down a vertical distance of 142 m, what is her mechanical energy? Explain your answer (CER) !