A wave has a wavelength of 4 m and a frequency of 85 Hz. What is the speed of this wave?

Which statement is true about air at different temperatures? Hot air is denser than cool air. Cool air contains lighter particles than hot air. Particles in hot air move faster than particles in cool air.

What energy change happens when the toaster to the right is plugged in? a. Electrical energy turns into chemical energy b. Light energy turns into electrical energy c. Electrical energy turns into potential energy d.

Why can't we store lightning? What are the pros and cons? (I need a detailed answer)

True or False: The more mass an object has, the faster it will fall.

Where are warm air vents usually located in a forced air heating system

A tree is standing in the middle of a meadow. As you watch, the wind begins to blow and the tree bends. Which statement best explains how you could tell that a net force was acting on the tree? OA) The tree had momentum.

Consider two cars, a 700kg Porsche and a 600kg Honda Civic. The Porsche is speeding along at 40 m/s (mph) and the Civic is going half the speed at 20 m/s.

Which statement about an electron in the 4d state is correct? A. The magnitude of its orbital angular momentum is 6√ℏ. B. The largest orbital angular momentum it could have in any given direction is 4ℏ. C.

A D note has a frequency of 587.33 Hz. Calculate its wavelength in meters. The speed of sound is 343 m/s

A cyclist allows his bike to roll down a hill without pedaling. Towards the bottom of the hill he applies his brakes. The bike comes to a stop. Applying the brakes causes the brakes to warm up. Describe the energy transfers that have occurred.