Which of the following objects uses two converging lenses to produce two images, the second of which is virtual, magnified, and inverted?
a. slide projector
b. corrective eyeglasses
c. camera
d. compound microscope

What type of nuclear decay causes the atomic number of an element to increase by 1?

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space.b. we'll know it immediately because it will be brighter than the full moon in the sky.c. we won't know about it until 600 years from now.d. none of the above.