What is a way to make magnets?

Heating
Pressure
Freezing

Heating

heat

Explanation: Heat about ¾ cup water in a small pan until it reaches somewhere between 185°-212°F or 85°-100°C. At boiling point the water should be close to or within this temperature range. Use your thermometer to check that the degree is appropriate. Using the plastic tongs, gently place the neodymium magnet in the water.

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west