An ultrasound wave vibrates at 30,000 times a second state the frequency of the wave.

A 405 Hz tuning fork and a piano key are struck together, and no beats are heard. When a 402 Hz tuning fork and the same piano key are struck, three beats are heard. What is the frequency of the piano key?

To qualify for the indianapolis 500 race, a car must average 350 km/hr for four laps. if a driver averages 320 km/hr for the first two laps, what average speed must be achieved for the final two laps in order to qualify?

George determines the mass of his evaporating dish to be 3.375 g. He adds a solid sample to the evaporating dish, and the mass of them combined is 26.719 g. What must be the mass of his solid sample

A person and a kayak paddles down river at an average speed of 10 km/hr. After 3.25 hours, how far has she traveled?

technician A says oil is primarily used to collect contaminants and carry them to the oil filter. Technician B says a breakdown in lubrication occurs on cold startup. Who is correct?

What would be an example of chemical change that took a long time to occur

What are elements made of?

The moon has a weaker gravitational force than earth. Sofia weighs 50 lbs. on earth. How much will she weigh on the moon? exactly 50 lbs. less then 50 lbs. more than 50 lbs.

If the speed of an object triples how does this affect its kinetic energy

What is currently the most supported theory about the future of the universe A.) the universe could remain exactly as it is today B.) the universe may continue to expand C.) stars could burn out, causing the universe to become dark and cold D.