What is it called when matter changes directly from a solid to a gas?

How dose an atom become an ion with a - 2 charge?

Two students are pushing their stalled car down the street. If the net force exerted on the car by the students is 1000 N at an angle of 20° below horizontal, the horizontal component of the force is: (a) greater than 1000 N. (b) less than 1000 N.

Tommy was walking at a rate of 4 miles per hour at noon and at 12:30 pm he was walking at a brisk rate of 6 miles per hour. Two hours later tommy was walking at a leisurely rate of 2 miles per hour.

Which of the following best describes magnetic fields

After finding that objects of the same mass do not always float or submerge the same way in a tub of liquid, Alexis wrote a new hypothesis to test objects that have the same mass.

The characteristics that follow are characteristics of two of Galileo's surviving double-convex lenses. The numbers given are magnitudes only; you must supply the correct signs. L 1: front radius 950 mm, rear radius 2700 mm, refractive index 1.

Which car has the most kinetic energy? A car of mass 1500 kg with speed 5 m/s or A car of mass 1300 kg with speed 3 m/s or a car of mass 1200 kg with speed 2 m/s or a car mass 1400 kg with speed 4 m/s

A 500 kg table with 4 legs rests on solid flat ground. I place 3 books on the center of the table with masses of 10 kg, 20 kg and 30 kg respectively. What is the normal force between the ground and one leg of the table?

Fluorine-21 has a half-life of approximately 5 seconds. What percentage of the original nuclei would remain after 20 seconds

Which of these is an example of a totalitarian regime A.) Canada under prime minister Trudeau's rule B.) the Soviet Union under Josef lo