A large iron sphere was placed a certain from a huge boulder. The force of gravity felt by the sphere from the boulder is 0.2N. The mass of the boulder is doubled and the distance is doubled. Which statement is correct?

Suppose that recording station n is located 200 km north of the epicenter of an earthquake, and recording station s is located 100 km south of the epicenter of the same earthquake. which of the following statements would be true?

Who was the first scientist to measure speed as distance over time?

If two students are running down the hall toward each other, trying to get to class, and they have the same mass and acceleration, what will happen when they collide? will their forces cancel out or will each one experience a reaction?