Diver uses a sonar device to determine the distance to her diving partner. the device sends a sound wave and records the time it takes for the wave to reach the diving partner and return to the device. suppose the wave travels at a rate of about 4000 feet per second. the wave returns 0.8 second(s) after it was sent. how far away is the diving partner?

Solar cell a produces 100 joules of energy, when a light source is shown on it for 3 minutes. solar cell b produces 200 joules of energy when the same light source is shown on it for 5 minutes. which solar cell works better? a) solar cell b, because it produces more energy. b) solar cell b, because it generates more power. c) solar cell a, because it produces energy quicker. d) solar cell a, because it generates a greater wattage. eliminate

Arunner is training for an upcoming marathon by running around a 100-m-diameter circular track at constant speed. let a coordinate system have its origin at the center of the circle with the x-axis pointing east and the y-axis north. the runner starts at (x, y) = (50 m, 0 m) and runs 2.5 times around the track in a clockwise direction.

Ascientific blank must be testable and capable of being proven false?