How does the density of a medium affectthe speed of a wave traveling through it

A particular solid is electrically charged after it is rubbed, but it is not known whether its charge is positive or negative. How could you determine which charge it has by using a piece of plastic and fur?

The force of gravity between two odjects depends on

Explain why the phrase "by ordinary means" was added to the Law of Conservation of Energy

What is the direction of magnetic field lines inside any magnet

A box that has a mass of 80 kg slides down a ramp with a 30 degree angle. The free-body diagram shows the forces acting on the box. Ignoring friction and air resistance, what is the acceleration of the box, to the nearest tenth? -0.5 m/s2 -4.

The small piston of a hydraulic lift has a cross-sectional of 3 00 cm2 and its large piston has a cross-sectional area of 200 cm2.

The pressure, temperature and volume of a system change differently during the process of isothermal expansion. Indicate whether each quantity increases, remains constant, or decreases.

Which of the following is true about rows of the periodic table? Atomic mass increases from left to right.

If you quadruple the temperature of a black body, by what factor will the total energy radiated per second per square meter increase?

How much work (in j) must be done to lift a stack of bricks, which has a mass of 400 kg, from the ground to a height of 3 m? (g = 10 m/s2) ?