Do waterfalls and rapids occur where rivers meet and flow over hard rocks?

The world record for the hundred meter dash is 9.77 s. what is the corresponding average speed in units of m/s, km/h, ft/s, and mi/h?

Which type of nuclear waste is most dangerous to humans? A. Low-level B. transuranic C. High-level

A beam of light is incident from air onto the surface of a liquid. When the angle of incidence is 45.0° the angle of refraction is found to be 36.0°.

A toy rocket that weighs 10 N blasts straight up from ground level with an initial kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J.

A spherical party balloon is being inflated with helium pumped in at a rate of 4 cubic feet per minute. How fast is the radius growing at the instant when the radius has reached 2 ft

The light from one end of the Milky Way galaxy takes about 150,000 years to travel to the other end. Which of these statements is correct about the Milky Way galaxy? A: The distance between the two ends of the galaxy is 150,000 light years.

A hydrogen ion will always combine with: A: A water molecule B: hydroxide ion C: hydronium ion D: another hydrogen ion You can only select one

During heavy exercise, the body pumps 2.00 L of blood per minute to the surface, where it is cooled by 2.00ºC.

In an isolated system, two cars, each with a mass of 1,500 kg, collide. Car 2 is initially at rest, while Car 1 was moving at 20 m/s. What is their final speed? A. 10 m/s B. 20 m/s C. 30 m/s D. 5 m/s

How is momentum conserved in a system in which two satellites connect? Question 19 options: The one satellite has all the momentum before they connect, and then afterwards they share it.