What must a magnet always have?

O A. Two like charges

OB. Two opposite poles

O c. Two opposite charges

OD. Two like poles

If a snorkeler can develop a pressure in her lungs that is 10 kPa below the pressure outside her body, what is the longest snorkel she could use in the ocean?

A 50kg box is pulled on by a rope. The rope applies a horizontal force of 180 N to the box. What is the normal force exerted on the box by the floor?

the specific heat of water is 4.186. suppose 100 J of heat is added to a body of water that is insulated and the temperature rose 1 degrees Celsius. how much mass of water is the body of water?

Which best describes the electromagnetic force? A. weak, but stronger than the strong force B. strong, but weaker than the weak force C. weak, but stronger than the gravitational force D. strong, but weaker than the gravitational force

A plane is flying east when it drops some supplies to a designated target below. The supplies land after falling for 10 seconds. How high above the ground was the airplane when the supplies were dropped? (Hint: d = 1/2gt2; g = - 9.

A plane flies along a straight line path after taking off, and it ends up 210 km farther east and 90.0 km farther north, relative to where it started. What is the plane's displacement?

Compare exothermic reactions and endothermic reactions. Give at least one similarity and one difference.

A solid cylinder with a radius of 73.3 cm and a mass of 2.33 kg accelerates uniformly from rest in 4.13 seconds while experiencing 6.71 rotations. Solve for the (a) final angular velocity.

In the early stages of its formation, earth became hot enough that some of its solid materials turned to liquid. Which of these factors did not directly contribute to earths high internal temperatures

How do you find Rtotal in a series without knowing the voltage?