Why would two poles of different magnets repel one another?

A car traveled 60km in 2 hours, 84km in the next hour, and then 68km in 2 hours before reaching its destination. What was the cars average speed?

How do polar bears use albedo to survive

A ball is dropped from a high rise platform at t=0 starting from rest. After 6 seconds another ball is thrown downwards from the same platform with a speed v. The two balls meet at t=18 s. What is the value of v?

Assume that the complete combustion of one mole of stearic acid, a fatty acid, to carbon dioxide and water liberates 11400 kJ of energy (Δ?°′=-11400 kJ/mol).

Jorge traveled 5 miles to school. After school, he traveled 1 mile to the Boys and Girls club and then traveled 6 miles back home. What was the distance of Jorge's trip? A. 0 miles B. 5 miles C. 11 miles D. 12 miles

A wave with a frequency of 30 Hz has a wavelength of 40.5 m. How fast is the wave traveling?

A soccer ball is sitting in the middle of a soccer field during a game. When the referee blows his whistle, one of the players runs toward the ball and kicks it as hard as he can.

A body with v=20m/s changes its speed to 28m/s in 2sec. its acceleration will be

Charge: A piece of plastic has a net charge of + 2.00 μC. How many more protons than electrons does this piece of plastic have? (e = 1.60 * 10-19 C)

How much heat is needed to raise the temperature of 6g of water by 18oC?