What class of asteroids is a threat to earth and other terrestrial planets?

What is 1 + 2 - 3 + 5 - 10

Suppose you dissolve 4.75 g of another solid (not urea) in 50.0 mL of water. You note that the temperature changes from 25.0 °C to 28.0 °C. Part 1: What is the mass of the solution?

Are sound waves transverse or longitudinal?

Which of the following is not a wave of the electromagnetic spectrum? microwave visible light wave radio wave surface wave * ~~ I think this is the answer

How long would it take to drive around earth's equator? (earth's circumference ≈ 40,000 km if driving at 143km?

At a constant pressure and a temperature of 280 K, the gas in a cylinder has a volume of 10.0 liters. If the volume of the gas is increased to 20.0 liters, what is the new temperature? 2800 K 28 K 140 K 560 K

what must be the distance between source of sound and mountain to give an echo in 5 seconds?, (speed of sound at 0°c=33m/sec

What is the speed of a 50 g rock if its de Broglie wavelength is 3.32 x 10?

Leanne is riding a bike. The forward force from her pedalling is 18N. There is a backward force of 6N from friction and a backward force of 12N from air resistance. Does the speed of the bike increase, decrease or not change?

How are energy and speed related