Most street lights are made from one or two elements mercury or sodium. Explain why astronomers preferred that cities you sodium streetlights instead of mercury streetlights

1. Explain the change of state from solid dry ice to carbon dioxide gas. 2. The motion of the particles in dry ice and carbon dioxide gas. 3. Explain how the original mass of dry ice compares with the mass of carbon dioxide gas.

Material A has a specific heat of 100 J/kg-K and Material B has a specific heat of 200 J/kg-K. If the two materials start at the same temperature and have heat energy added at the same constant rate, which would you expect to reach a higher

If you have several lights in a series circuit and one of these lights breaks or burns out, what will happen to the other lights in the circuit?

As you contract your muscle, which of the following events is occurring? All the kinetic energy is converted to potential energy. All the potential energy is converted to kinetic energy. Energy is being created. Heat is released.

Suppose you have a coffee mug with a circular cross section and vertical sides (uniform radius). What is its inside radius if it holds 400.0 g of coffee when filled to a depth of 6.00 cm? Assume coffee has the same density of water. Answer in cm.

Woman pulls a 6.87 kg suitcase, initially at rest, with a 29.2 N force along the handle at 57.7º. Friction pulls back at 12.7 N, and the suitcase moves 5.93 m. What is its final speed? (Unit = m/s)

Suppose you know a golf ball's horizontal velocity and the time it has traveled through the air. how could you calculate how far the ball traveled

What is a radio interferometer? a device for correcting chromatic aberration in radio telescopes a device for absorbing and transmitting radio waves a network of several radio telescopes wired together a radio communication network joining several

In which galaxy is our solar system located? a. milky way b. ngc 4414 c. andromeda d. small magellanic cloud

Two astronauts, of masses 60 kg and 80 kg, are initially right next to each other and at rest in outer space. They suddenly push each other apart. How far has the heavier astronaut moved when the lighter astronaut has moved 12 m