At 1 kilometer per year, how many centuries would it take for people to move from africa to china which is 10,000 kilometers away-

Describe how the size of the force of friction depends on the size of the normal force?

Saturn appears to emit heat as infrared radiation in excess of the energy absorbed from sunlight and also the kelvin-helmholtz contraction. the most likely major cause of this excess heating is

A truck has four times the mass of a car and is moving with twice the speed of the car. If Kt and Kc refer to the kinetic energies of truck and car respectively, it is correct to say that:A) Kt = 16Kc. B) Kt = 4Kc. C) Kt = Kc. D) Kt = 2Kc.

A fisherman uses sonar to find a shoal of fish. A pulse of ultrasound is sent out and the reflection is detected 0.4 seconds later. How long did it take the sound to travel from the boat to the fish?

I am a titan condemned by Zeus to support the heavens upon his shoulders; son of Iapetus and the nymph clymene; brother of Prometheus and Epimethius. Who am i?

Why does it hurt your hands when you carry heavy shopping in carrier bags?

Why did scientists choose carbon as a base for the atomic mass unit? Which isotope of carbon did they use?

What organelle is found in all animal cells and some plant cells

Basic of Archimedes's principle of how fluid can make body to float and sink.

A bullet is accelerated down the barrel of a gun by hot gases produced in the combustion of gun powder. What is the average force (in N) exerted on a 0.0500 kg bullet to accelerate it to a speed of 625 m/s in a time of 1.10 ms (milliseconds)