Which is generally easier to accomplish? Prove a hypothesis Disprove a hypothesis

The horizontal and vertical components of the initial velocity of a football are 16 m/s and 20 m/s respectively. If there is no air resistance, how long does it take the football to reach the top of its trajectory?

A box moves 10 m horizontally when force F = 20 N is applied at an angle θ=30° degrees. What is the work done on the box by force F during the displacement?

A red apple will appear black when illuminated with

Given that an atom of a semiconductor has a diameter of 2.18 å, what is the maximum number of moles that fit in the channel of a processor chip that is 63.6 nm long, 74.

Imagine you are in a music concert. What different sounds might you hear? How are these sounds made?

Explain why we see the Milky Way as a faint band of light stretching across the sky.

A piece of plastic tape coated with iron oxide is magnet - ized more in some parts than in others. When the tape is moved past a small coil of wire, what happens in the coil? What is a practical application of this?

As earths plates move apart at some boundaries, they collide at others, forming

Potential energy that depends on height is called a. kinetic energy. b. gravitational potential energy. c. elastic potential energy. d. mechanical energy.

A steel railroad track has a length of 40 m when the temperature is - 5 ◦C. What is the increase in the length of the rail on a hot day when the temperature is 35 ◦C? The linear expansion coefficient of steel is 11 * 10-6 (◦C) - 1.