What type of system allows matter and energy to enter and exit

What was Newton's reasoning about the apple falling from the tree?

A 20kg rock is on the edge of a 100m cliff. what gravitational energy does the rock process relative to the base of the cliff

A sound wave travels across a 2,100-meter wide valley in 7.0 seconds.

Which factors can most directly affect the motion of a spring?

What is the overall function of the circulatory system and how do the organs of this system work together to achieve this goal?

Each of the following lists two facts. which pair can be used with newton's version of kepler's third law to determine the mass of the sun? each of the following lists two facts.

Which is the temperature at which a solid changes into a liquid?

What is the formula for velocity?

The 3.00 kg cube in fig. 15-47 has edge lengths d 6.00 cm and is mounted on an axle through its center. a spring (k 1200 n/m con - nects the cube's upper corner to a rigid wall. initially the spring is at its rest length.

A freight train traveling with a velocity of - 4. o m/s begins backing into a train yard. if the train's average acceleration is - 0.27 m/s^2 what is the trains velocity after 17s