A man runs at the speed of 10km/hr. how much time will he take to cover 750 meters?

Which scientist used cepheid variables to measure the distance to faint "nebulas" in our sky, proving they were actually whole other galaxies?

Which statement best describes the difference between strong nuclear forces and weak nuclear forces?

What type of force will cause a object to change its speed

Which are true statements? Check all that apply. A. 1 mol is 6.02 * 1023 of something. B. 6.02 * 1023 g is the weight of 1 mol. C. The mass of 1 mol is the same as the atomic mass in grams. D. A mole is the atomic mass.

Which kind of wave would be observed in outer space between planets, where there is very little matter?

How does a change in resistance affect the conductivity of a material? A) The lower the resistance, the worse the conductivity B) The lower the resistance, the better the conductivity C) The higher the resistance, the better the conductivity D) The

Two railroad cars, each of mass 6500 kg and traveling 80 km/h in opposite directions, collide head-on and come to rest. how much thermal energy is produced in this collision?

What is a result of using a machine?

A boy rides motorbike with velocity of 20 m/s He accelerates his motorbike to a velocity of 30 m/s for 5 second. Calculate the acceleration produced in the motorbike. [Ams 2ms

How is a star's emission spectrum used to study stars?