Do all electromagnetic waves travel at the speed of light, carry energy, and travel through a vacuum?

When an object is heated it contracts. a. true b. false

The temperature at a point (x, y) is t(x, y), measured in degrees celsius. a bug crawls so that its position after t seconds is given by x = 6 + t , y = 8 + 1 3 t, where x and y are measured in centimeters. the temperature function satisfies tx(3, 9) = 5 and ty(3, 9) = 4. how fast is the temperature rising on the bug's path after 3 seconds? (round your answer to two decimal places.)

The earth exerts a gravitational force of 500 n on amy. what is amy’s mass in kg?