Pls answer fast!
a girl throws a rock into a pond. a leaf floating ok the pond bobs up and down but does not change location on the ponds surface. why not?

a. the wave transports only energy, not matter.
b. the rock produced a stationary wave, not a moving wave
c. the rock was only a single disturbance, not a repeating motion.
d. the wave made by the rock is not strong enough to move the leaf

Consider the following problem: a box with an open top is to be constructed from a square piece of cardboard, 3 ft wide, by cutting out a square from each of the four corners and bending up the sides. find the largest volume that such a box can have.

Give your knowledge of these things in your paper, you will compare and contrast analog and digital signals to determine which is more reliable for encoding and transmitting information. you’ll compare these features: signal shape numerical values for signal measurements amount of data that can be transmitted energy requirements privacy and security (ability of the signal to be encoded in a secret code) clarity of signal in the space provided, write down what you already know about any of these features. if you’re not sure, write down questions you might have about the features.

In an experiment, how can i change human errors? be specific.