Frequency = (speed) / (wavelength) = 20 / 0.5 = 40 per second = 40 Hz.
A bucket, bath tub, sauce pan.
If a body is moving from left to right or right to left it is linear motion in x- direction. It is also called one dimensional motion.
If a body is moving up to down or down to up it is linear motion in y- direction. It is also called one dimensional motion.
But if a body is moving forward as well as downward it travels in X direction and in y direction at the same time. Such a motion is called two dimensional motion.
E.g motion of a ball.
Attachment shows path of two dimensional motion of a ball.
The answer would be 22.50cal
During the refrigeration cycle, warm gases are made even hotter due to pressurization