Which coefficient of O2 is needed to balance the equation C3H8 + O2 → 3CO2 + 4H2O?

a. 2

b. 3

c. 5

d. 6

What element has 102 neutrons and 70 electrons

Which term defines the energy of motion? a. chemical energy b. electrical energy c. gravitational energy d. kinetic energy user: what is electromagnetic energy that travels in transverse waves? a. nuclear energy b. potential energy c.

What type of reaction occurs when a candle is burned? A. Endothermic, because energy is absorbed B. Exothermic, because energy is released C. Endothermic, because energy is released D. Exothermic, because energy is absorbed

Describe the energy transfers that occur in an electric circular saw that runs from a generator.

A 4kg rock isn't rolling 10m/s. Find it's kinetic energy.

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

A person suffering from anaemia gets tired

Jessica took a Mylar balloon outside on a very hot day. As she waited for the bus the balloon began to get bigger. What is the best explanation of this?