Who discovered that the proton has a positive charge

The universe is believed to have been form from a very dense fireball billions of years ago.

What is the source of energy that will send the arrow flying toward the target?

While rowing across the lake during a race, Tom does 4,500 of work on the cars in 300 What is his power output in watts?

The orbital period of Jupiter is 11.86 years. What is its distance from the sun?

Why does a can collapse when a vacuum pump removes air from the can?

A baseball has mass 0.145 kg. (a) If the velocity of a pitched ball has a magnitude of and the batted ball's velocity is in the opposite direction, find the magnitude of the change in momentum of the ball and of the impulse applied to it by the bat.

A long distance runner has an average speed of 4m/s during a race. How far does the runner travel in 20 minutes?

Density is calculated by dividing

The one island species evolved into three different species. This is called?

Find the components of vector M shown in figure 5-7