While skateboarding at 19 km/h, Alana throws a tennis ball at 11 km/h to her friend Oliver. If Alana is the reference frame, the speed of the tennis ball is km/h.

Which of the following is not an example of energy transmission by waves? sound ripples on a pond an apple falling from a tree light

Maritime climates can be expected in the middle of large continents. True False

This is the method by which a wave travels through a medium or a vacuum.

Which of these factors will increase the speed of a sound wave in the air

Since the moon orbits the earth approximately every 27 days, there is a lunar eclipse approximately every 27 days. True False

What does Kepler's second law state? A. Planets travel in ellipses. B. Planets sweep equal areas in equal times. C. A planet's apparent backward movement is termed retrograde motion. D.

Why do charges build up in a cloud

How does the wave model of electrons orbiting the nucleus account for discrete energy values?

An ecosystem is all the populations of organisms that live together and A. the microorganisms that depend on them. B. the organisms that generate energy from sunlight. C. the physical factors with which they interact. D.

Which statement about magnetic poles is accurate? A) Same magnetic poles attract, while different magnetic poles repel. B) Same magnetic poles attract, while different magnetic poles attract.