Which of the following is a key assumption of the scientific method

Although electric field is tangent to electric field lines, free charged particles do not necessarily move alone the field lines. Explain why not, and give a specific example illustrating your reasoning

Old cannons were built on wheeled carts, both to facilitate moving the cannon and to allow the cannon to recoil when fired. When a 150 kg cannon and cart recoils at 1.5 m/s, at what velocity would a 10 kg cannonball leave the cannon?

From the list below, select the major disadvantages of manned space missions. a. cost b. danger c. risk of human error d. negative media coverage e. lack of qualified astronauts

What happens to metal railroad tracks during the heat of a summer day

How to find when the particle changes direction?

Why oil does not dissolve in water?

Which element has the highest number of protons? a. Calcium b. Argon c. Xenon d. Radon

Which are the most common producers in aquatic ecosystems? a - bacteria b - algae c - fish d - plants

You push a piano 5 meters across the floor with a force of 400 n. how much work have you done?

Monochromatic electromagnetic radiation illuminates an area of a surface. The electric and magnetic fields of the waves are then doubled in magnitude.