Which of the following best describes alternating current? current that increases and decreases in temperature current that constantly turns on and off current in which charges change direction current that gains and loses electrons

Needed for bacteria to carry out all their life functions

Which of the following statements are true? Check all that apply. A) The electric field between the plates of a parallel-plate capacitor is uniform. B) A capacitor is a device that stores electric potential energy and electric charge.

If you fill up a balloon with a small amount of air, then set it in direct sunlight, you will see that the balloon expands. This expansion is due to an increase in volume, which results from A) a decrease in the pressure of the air in the balloon.

The SI unit for pressure is pascal (Pa). One hectopascal would equal how many pascals? 0.1 Pa 10 Pa 100 Pa 1000 Pa

What is 2.0 ft * 4 ft, to the correct number of significant figures?

A merry-go-round rotates with a centripetal acceleration of 15 m/s2. If the outer horses are 7 m from the center of the ride, what is their velocity? O A. 11.8 m/s O B. 10.2 m/s O O C. 9.6 m/s D. 8.4 m/s

Which is not a part of the walking mechanism of the human body? a rigid bar a fulcrum a resistance a gear

Based on the periodic table above, which of the following elements is a metal?

Car crosses the first third of the road with unknown speed and the rest of the road with the speed of 50 km/h. What is the the speed in the first third if the average speed of a car is 30km/h?

1. A car speeds up from 10.0 m/s to 45.0 m/s in 4.0 s. What is its acceleration? In your response, show your work, the given and unknown quantities, the equation, and any necessary algebra.