the first ounce of postage charges for sending letters to country x is $0.79. each additional ounce is $0.55. how much is the postage for a letter weighing 8 ounces?

What are some properties of transverse waves?

Which model displays the change in a gas when the temperature of the gaseous system decreases?

The stopwatch used by a student to measure velocity of a pulse in a slinky was of least count 0.1 second. he stops the stopwatch when a pulse has made 3 journeys from one end to the other of the slinky. he finds the seconds hand to be at 52nd division. calculate the correct time noted by him.