48. Protons have ___ charge, neutrons have ___ charge, and electrons have ___ charge.

A. negative; positive; no

B. positive; no; negative

C. positive; negative; no

D. negative; no; positive

E. no; negative; positive

Threshold potential refers to the membrane potential required to: A. initiate an action potential and open voltage-gated sodium ion channels. B. initiate an action potential. C. open voltage-gated sodium ion channels. D.

How much force is needed to stop an 80kg football player if he decelerates at 5m/s2

Which of the following are not properties of acids? Check all that apply. A. Reacts with certain metals B. Tastes bitter C. Slippery D. Reacts with limestone to produce carbon dioxide

What happens if you double the number of batteries used in a circuit? (Assume all of the batteries A. The current doubles only. o B. The voltage doubles only. C. The current decreases. D The voltage decreases. 0 E. The voltage and current doubles.

Two waves are superposed. One wave has an amplitude of 3 cm, and the other has an amplitude of 4 cm. What is the resultant amplitude?

When a siren is approaching you, how does the wavelength of the waves reaching you compare to the actual wavelength that the siren emits?

In a harbor, you can see sea waves traveling around the edges of small stationary boats. Why does this happen?

Correct unit of speed

Technician A says that for best results, loosen the fastener immediately after spraying it with penetrating oil. Technician B says that rusted fasteners may be loosened by tapping with a hammer. Which technician is correct? a. technician A only b.

A roller coaster track is 3,000 meters long. It takes 100 seconds to travel once around the roller coaster. Is the velocity constant throughout the trip? Explain.