How many significant figures are in 50.5?

Which of these stars does not have fusion occurring in its core?

A car with a mass of 1.50x10^3 kg starts from rest and accelerates to a speed of 18.0m/s in 12.0 s. assume that the force of resistance remains constant 400.0n during this time. what is the average power developed by the car's engine.

When people use plastic combs on their hair, the combs become negatively charged. Which statements about this situation are true? The comb loses electrons. The comb gains electrons. The hair loses electrons. The hair gains protons.

Identify H2 and describe its properties

Explain why two different elements cannot occupy the same box in the periodic table

Objects can be accelerating and traveling at constant velocity at the same time. True or False

What kind of star gives rise to a type i supernova? a. white dwarf stars b. massive main sequence stars c. red giant stars?

Example of an object in motion

A proton and an alpha particle are momentarily at rest at a distance r from each other. They then begin to move apart. Find the speed of the proton by the time the distance between the proton and the alpha particle doubles.

Why is it a good idea to extend your bare hand forward when you are getting ready to catch a fast-moving baseball? a. So you can catch the ball with a stiff arm, increasing the time to slow the ball thus deceasing the force. b.