An open system is a system in which both matter and energy are exchanged with the surroundings.

a. true

b. false

In gauss's law, to what does qencl refer?

How are animals of the coniferous forest well adapted to long, cold winters?

If you shine a laser toward a friend in a spaceship who is moving away from you at half the speed of light, what do you see? you see the laser light pass your friend at slightly more than the speed of light.

An B flat is played on a french horn, whose frequency is 466Hz. 1. what is the period of one vibration of this tone? 2. as the sound leaves the instrument at a speed of 343m / what is the wavelength?

A tank having a volume of 0.85 m 3 initially contains water as a two-phase liquid-vapor mixture at 260 o C and a quality of 0.7.

A lorry with a mass of 5000kg accelerates to overtake a caravan on the motorway. Its acceleration is 1.5m/s². What force must the engine be providing? You can ignore the effects of friction and air resistance

Norma kicks a soccer ball with an initial velocity of 10.0 meters per second at an angle of 30.0% if the ball moves though the air for 3.2 seconds what's the horizontal distance traveled by the ball

Suppose s (t) is the position of an object moving along a line at time t is greater than or equal to 0. What is the average velocity between the times t=a and t=b? What is the instantaneous velocity at t=a?

Estimate how long it would take one person to mow a football field using an ordinary home lawn mower. suppose that the mower moves with a 1-km/h speed, has a 0.5-m width, and a field is 360 ft long and 160 ft wide. 1 m = 3.281 ft.

Badri makes the table below to review the factors that affect the electric force between objects. Which change will correct the error in Badri's table?