An electric bell is kept under a bell jar in which a vacuum has been created slowly air is introduced in to the jar. what will happed to the sound of electric bell?

A soccer ball is kicked at an angle of 30° to the horizontal with an initial velocity of 16 m/s. How high does the soccer ball go? A: 9.8 m B: 3.3 m C: 0.6 m D: 0.2 m

A copper penny has a mass of 3.1 g and a volume of 0.35 cm3. What is the density of copper? Be sure to show your work and include units.

A loudspeaker diaphragm is producing a sound for 2.2 s by moving back and forth in simple harmonic motion. The angular frequency of the motion is 3.95 x 104 rad/s. How many times does the diaphragm move back and forth?

Are there any scientific proofs of existing UFO? Has anybody seen it?

The winch is an example of what simple machine?

Which example identifies a change in motion that produces acceleration? choices are: 1. a speed skater moving at a constant speed on a straight track 2. a ball moving at a constant speed around a circular track 3.

Which of the following diagnostic procedures uses ultrasound?

Why is it easier to read black text on a white background than to read green text of any light color?

If object A has more mass than object B, does object A contain more matter? Explain.

Describe a beach that was near stormy seas and powerful waves