Suppose an atom has a mass number of 23. What does this mean?

True or false a fuel resource can be replaced in an reasonably short time called a nonrenewable resource.

Write formulas for the following compounds: potassium iodine, phosphorus pentachloride, magnesium hydroxide, aluminum sulfate, dichlorine heptoxide, and calcium nitrate trihydrate.

The angle between an incident light ray and a plane mirror is 50 degrees. What is the angle of incidence? And what is the total angle turned by the light ray?

Light travelling in one material enters another material in which it travels faster. The light wave will:

What is the magnitude of the displacement of a car that travels half a lap along a circle of radius of 150m?

How much force is needed to accelerate an object of mass 90 kg at a rate of 1.2 m/s2? 0.013 N 75 N 108 N 1080 N

No work is done on an object when a force acting on the object does not move it. True False

wavelength of a light whose second-order dark band forms a diffraction angle of 15.0° when it passes through a diffraction grating that has 250.0 lines per mm

If a fully loaded shopping cart has a head-on collision with an empty cart both moving at the same speed toward each other, which cart experiences the greater force? The greater impulse? The greater change in momentum? The greater acceleration?

Why didn't early Portuguese and Dutch explorers decide to create settlements in Australia