Can anything reflect x-rays or gamma rays?

Salt water has greater density than fresh water. a boat floats in both fresh water and in salt water. where is the buoyant force greater on the boat?

A circuit is used in which process? A electricity B magnetism C velocity D gravity

A theory is a powerful explanation for a broad set of observations 1) True 2) False

a pitcher throws a fastball horizontally toward home plate 18.39 meters away. If the ball is traveling at a speed of 40.0m/s, neglecting air friction, how long does it take for the ball to get to home plate

A pipe that is 0.92 m long and open at both ends vibrates in the second overtone with a frequency of 584 Hz. What is the speed of sound in the air in this pipe

How does the overtone number relate to the standing wave pattern number

Which of the following statements about Em waves is true? A. Em waves all have the same speed B. Em waves all have the same wavelength C. Em waves only travel through water D. Em waves all have the same amount of energy

A teacher has asked four students to state a scientific theory. Which student is correct?

What are the two main currents that affect the US on the east and west coast?

What role do volcanoes play in the flow of energy and cycling of matter on earth?