A number has a atomic number of 9 and an atomic mass of 19 amu. how many protons and how many neutrons are present in the atom

Corrosive substances are rarely harmful to human skin. True False Most problems addressed by the technological design process have only one solution. True False

The color of an opaque object is the same as the light that is

The best way to describe speed is a how the time is multiplied by the temperature b the time it takes to go a distance c time traved over a certain distance traved d the change in position e distance covered in a certain amount of time

To introduce you to the concept of escape velocity for a rocket. the escape velocity is defined to be the minimum speed with which an object of mass m must move to escape from the gravitational attraction of a much larger body, such as a planet of

A ball traveling with an initial momentum of 4.5 kgm/s bounces off a wall and comes back in the opposite direction with a momentum of - 3.5 kgm/s. What is the change in momentum?

A 500kg elevator is raised to a height of 10 m in 10 seconds. Calculate the power of the motor. 490 W 49,000 W 4900 W 490,000 W

Which one of newton's laws does a doll riding a dog represent

Archimedes tells us the lifting power of a balloon (how much mass it can lift) is equal to the difference between the mass of the balloon and the mass of the air it displaces.

What are the parts of a pendulum? Describe each part.

Why do space suits need to be pressurized?