Regions in the milky way where density waves have caused gas clouds to crash into each other are called

Astone dropped into a well is heard to strike the water after 8seconds. find the depth of the well if the velocity of sound is 350m/s

As a pendulum bob swings back and forth several times, the maximum height it reaches becomes less and less. this is because more and more of the pendulum bob's energy is being transformed into a. heat energy b. kinetic energy c. potential energy d. kinetic energy and potential energy

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up