Imagine a glass box that is completely sealed and in that box is a cactus in a small pot which statement is most accurate?
a. this is an open system because the light can go through the glass and get into the box
b. this is an open system because air is circulating inside the glass box
c. this is a closed system because nothing of substance and get in or out of the box
d. this is a closed system because of light enters through the glass box

The x-coordinate of a particle in curvilinear motion is given by x = 3.1t3 - 4.9t where x is in feet and t is in seconds. the y-component of acceleration in feet per second squared is given by ay = 2.3t. if the particle has y-components y = 0 and vy = 5.0 ft/sec when t = 0, find the magnitudes of the velocity v and acceleration a when t = 1.8 sec. sketch the path for the first 1.8 seconds of motion, and show the velocity and acceleration vectors for t = 1.8 sec. answers: v = ft/sec a = ft/sec2

When is a current produced? when the terminals of an electrochemical cell are connected by a wire if the electric circuit is opened in an electrochemical cell if the electrolyte is removed from an electrochemical cell when the electrodes are reversed in an electrochemical cell

Give an example in which the electrical energy changes to light energy