What type of electricity do we use in our homes?

A) direct current

B) alternative current

C) alternating current

D) ac/dc

Which of the following phases of the Moon produces the highest and lowest tides on Earth? A. Third quater moon B. New moon C. Crescent moon D. First quarter moon

The type of lens that spreads out parallel light is a

When NaH combines with water, OH - ions are produced. This shows that NaH is an acid. true or false

How does an airplane engine work?

How many galaxies exist?

Two masses are separated by 1 m. suppose the masses are moved so they are 2 m apart how will the gravitational force change

Bob rubs a piece of fur on a hand rubber rod, giving the rod a negative charge. what happens?

The period of a simple pendulum is 3.8 s. the length of the pendulum is doubled. what is the period t of the longer pendulum? t = s

True or false - sound waves can travel across outer space.

In which one of the following locations can a person hear the echo of a sound? a. At least 33.2 meters behind the reflecting surface b. Less than 16.6 meters in front of the reflecting surface c. Less than 33.2 meters behind the reflecting surface d.