What causes reddening of starlight? Explain how the reddish color of the Sun's disk at sunset is caused by the same process.

A train moves at a constant velocity of 50km/h. How far will it move in 0.5 h?

Professional Application: A 30,000-kg freight car is coasting at 0.850 m/s with negligible friction under a hopper that dumps 110,000 kg of scrap metal into it.

A boat sails along the shore. To an observer, the boat appears to move at a speed of 11 m/s, and a man on the boat walking forward appears to have a speed of 12.4 m/s. How long does it take the man to move 6 m relative to the boat?

An astronaut's weight on earth is 800 N. What is his weight on Mars, where g=3.76m/s2?

If an acid is splashed on your skin, wash at once with

A measure of the energy of motion of the particles in a substance is its

What is the final velocity of the combined bumper cars A 225 kg red bumper car is moving at 3.0 m/s. It hits a stationary 180 kg blue bumper car. The red and blue bumper cars combine and hit a stationary green bumper car of mass 150 kg.

0.4-L glass of water at 20°C is to be cooled with ice to 5°C. The density of water is 1 kg/L, and the specific heat of water at room temperature is c = 4.18 kJ/kg·°C. The specific heat of ice at about 0°C is c = 2.11 kJ/kg·°C.

Regions in a sound wave where particles are farthest apart are called

What will happen to thermal condictivity of a substance if its thickness is doubled? Also give reason.