Amy counts the wave crests traveling down a stretched string. Five wave crests pass Amy in two seconds. What is the frequency of the wave?

A. 5.0 Hz

B. 2.5 Hz

C. 10 Hz

D. 2.0 Hz

Which statement is true about the atomic mass? a. it is never greater than the atomic number b. it always equal the atomic number c. it always lowers the atomic number d. it can be greater than the atomic number

Stomach acid has a pH of about 2. Which describes the pH of an antacid that is used to neutralize stomach acid? The antacid must be basic, so its pH is greater than 7. The antacid must be acidic, so its pH is less than 7.

Calculate the magnitude of the electric field 9.25 cm from the center of the sphere. Answer in units of N/C.

A wave has a frequency of 270 Hz and a wavelength of 60 m. What is the speed of the wave? A. 0.022 m/s B. 0.00062 m/s c. 45 m/s D. 1600 m/s

Can you describe Saturn?

Electrons flowing into a resistor make that end A. positive with respect to the other end B. negative with respect to the other end C. higher in resistance D. extremely warm

The force of air resistance acts to oppose the motion of an object moving through the air. A ball is thrown upward and eventually returns to the ground.

The temperature of a substance during an experiment can be modeled by the function f (x) = - 7.5cos (πx30) + 31.4, where f (x) is the temperature °c and x is the number of minutes into the experiment.

Which of the following are good conductors? A. A rubber tire B. A penny C. A newspaper D. An aluminum soda can E. Water F. Air

Ideentify the two atmospheric layers that contain air as warm as 25 degrees Celsius.