How to check if something is glass or plastic?

An FM radio station broadcasts at 9.23 x 107 Hz. Given that the radio waves travel at 3.00 x 108 m/s, what is the wavelength of these waves?

A pair of glasses is dropped from the top of a 42.0 meter high stadium. A pen is dropped from the same position 2.00 seconds later. How high above the ground is the pen when the glasses hit the ground? (Disregard air resistance. a = - g = - 9.

Glider A of mass 2.5 kg moves with speed 1.7 m/s on a horizontal rail without friction. It collides elastically with glider B of identical mass 2.5 kg, which is initially at rest.

A sample of an unknown compound is vaporized at. The gas produced has a volume of at a pressure of

What is the difference between washing of clothes at home and washing by dry cleaning at laundry

How are primary and secondary succession similar and how are they different?

What relates the net force exerted on an object to its mass and acceleration?

I'm a wave, the medium moves parallel to the direction that the wave travels

What is the wavelength of a wave that has a velocity of 32 m/s and a frequency of 60.6 Hz?

Two objects repel each other with a force of 8N. if