According to the graph, what is the maximum age at which a 4000 Hz sound wave with an intensity of 20 dB would be heard?

55

60

65

70

Which of these is most likely to be attracted to a magnet? A. a book B. staple C. stone D. eraser

How many known elements are there?

A book sitting on a shelf has gravitational potential energy. true or false

Two charged particles are projected into a region where a magnetic field is directed perpendicular to their velocities. if the charges are deflected in opposite directions, what are the possible relative charges and directions?

What is the period of a simple pendulum is its frequency is 20 Hz? a. 20 sec b. 2/1 sec c. 1/2 sec d. 1/20 sec

A force acts on a 5kg object at rest. How fast will the object accelerate on a frictionless surface? A.) 4 m/s^2 B.) 15 m/s^2 C.) 25 m/s^2 D.) 100 m/s^2

Four wrestlers step on a scale for a tournament. Wrestler A weighs in at 170 pounds; wrestler B weighs in at 168 pounds; wrestler C weighs in at 171 pounds; and wrestler D weighs in at 169 pounds.

What is a change in velocity per time

Recall specific heat of water is 4186 j/kg/C. Find the specific heat of sample. Water. Sample Mass 109 192 Internal temperature. 21. 67 Final temperature. 30.1. 30.1

During which period did the first large herbivores and carnivores appear?