What s a defining feature of a system?

Which contribution did Kepler make to viewing the solar system? He proposed that gravity kept the planets in their orbits. He proposed the sun-centered model of the solar system. He showed that planets moved in elliptical orbits.

A passenger jet in the air increases its speed. does the downward force of air on the top of the wings increase or decrease? does the net lifting force of the air on the wings increase or decrease?

A 8.2 L sample of gas has a pressure of 0.8 atm at a temperature of 259 K. If the temperature increases to 301 K, causing the volume to increase to 11.5 L, what is the new pressure? Round your answer to the nearest tenth.

A coil of wire, a battery, a few paper clips, and a thermometer are on a table of supplies What other material or materials would be needed for a student to construct a basic electric motor?

Name the property of bodies to resist a change in their velocity.

State the law of conservation of energy in your own ords

The malfunction indicator light in an OBD II system is flashing. Technician A says that this simply indicates a soft failure. Technician B says this means the problem could be damaging the catalytic converter. Who is right? A. Technician A only B.

What are some methods humans have used to control flooding and what has been done to worsen the effects of flooding?

Suppose an electron is moving with a constant velocity until it encounters a positively charged sphere on its right. How does the sphere alter the trajectory of the electron? a. It has no effect on the trajectory of the electron b.

Most of the mass of the Milky Way exists in the form of: a.) starsb.) gasc.) dustd.) dark matter