Weather balloons appear only partially inflated when launched into the air. Why would scientists do this?

Calculate the heat energy needed to change the temperature of 2 kg of copper from 10°C to 110°C. heat = Kcal

Distance travelled can be found from the A area under a velocity-time graph B area under an acceleration-time graph C gradient of a force-time graph D gradient of a velocity-time graph

What factors determine power

One may conceive light to spread successively, by spherical waves. -Christiaan Huygens, 1600s What theory was Huygens writing about? A. the particle theory of light B. the reflection of light off objects C. the way objects refract light D.

Earth orbits once around the Sun about every 365 days. The Moon orbits around Earth. About how many days does it take the Moon to orbit twice around the Sun? A. 730 B. 365. C. 64. D. 29

Science fiction movies that include explosion sound effects for battles in space are not scientifically correct. Why is this? A. The sound from an explosion can only be transmitted by air. B.

What is the kinetic energy of a 1,900 kg car moving at 89 km/h?

Why do we study black holes

Calculate the kinetic energy of a charging elephant if its mass is 5,000kg and it moves at 8m/s

Why is a decrease in Earth's ozone harmful to life?