An element becomes a positively charged ion when it

loses protons.

loses electrons.

gains electrons.

gains neutrons.

A champion athlete can produce one horsepower (746 W) for a short period of time. The number of 16-cm-high steps a 70-kg athlete could ascend in one minute while expending one horsepower is

1. If a 40 kg person is accelerating at 10 m/s2, then the force acting on him or her is 400 N A. true or B. false 2. How much force is needed to make a 60 kg object accelerate at a rate of 2.0 m/s2? A. 62 N B. 62 kg C. 120 N D. 120 kg 3.

what is two thirds of 27

What is the total charge of 1.0g of electrons?

Convert 1.4*10^9km^3 into cubic meters

Which planets in our solar system rotate the opposite way to the others

Science fair project

What does this graph show about the relationship between mass and acceleration? As acceleration increases, mass increases. As acceleration increases, mass is unaffected. As mass is unaffected, acceleration decreases.

The measure of the distance an object travels in a certain length of time is the object's

A wave is a (blank) that carries (blank) from one place to another