A string vibrates at a frequency of 20hz what is its period

Why does the originally neutral hair and balloon become charged

Which energy conversion is made in a battery? Question 13 options: a) chemical to electrical b) mechanical to electrical c) light to electrical d) electrical to chemical

Sla's change in velocity is 30 m/s, and Hazel has the same change in velocity. Which best explains why they would have different accelerations?

According to Newton's first law of motion, when will an object at rest begin to move? a. when its inertia decreases to zero b. when an unbalanced force acts upon it c. when the action and reaction forces are equal d.

An airplane flies at 400 km/h in a 100km/h hurricane crosswind. Find the resultant speed of the plane.

Bob is coming toward you at a speed of 75 km/hr. You throw a baseball in his direction at 75 km/hr. What does he see the ball doing?

Give 3 examples of something with potential energy.

A graph that shows that the pressure of a gas varies inversely with its volume under constant temperature demonstrates A. The pressure law B. The density law C. Charle's law D. Boyle's law

5. Why should the electrons be placed separate from each other (why not together) ?

A battery high rate discharge (load capacity) test is being performed on a 12 volt battery. Technician A says that a good battery should have a voltage reading of higher than 9.6 volts while under load at the end of the 15-second test.