What is the frequency of an ultrasound that vibrates 30 000 times a second

In April 1974, Steve Prefontaine completed a 10.0 km race in a time of 27 min, 43.6 s. Suppose "Pre" was at the 7.43 km mark at a time of 25.0 min.

A cell phone tower is most likely to produce electromagnetic waves at which of these frequencies? A. 108 waves per second B. 1016 waves per second C. 1020 waves per second D. 1013 waves per second

In order for work to be done, what three things are necessary? power, a force, and movement in the opposite direction of the applied force balanced forces, motion, and distance covered over time unbalanced force, motion in the same direction as the

An alpha particle travels at a velocity vector v of magnitude 660 m/s through a uniform magnetic field vector B of magnitude 0.060 T. (An alpha particle has a charge of + 3.2 10-19 C and a mass of 6.6 10-27 kg.

What does ice become when it absorbs enough heat energy. C. Frost. D. Liquid

Calculate the energy released as heat when 51.60 g Cu 2 O (s) undergo oxidation at constant pressure.

During summer vacation, Juan traveled a total distance of 400 miles. His trip took 8 hours. What was the average speed during his trip?

Where Pabs is absolute pressurePg, is gauge pressure, and Patm is atmospheric pressure. For example, if your tire gauge reads 34 lb/incz (pounds per square inch), then the absolute pressure is ...

The tip of a triangle is held 12.0 cm above the surface of a flat pool of water. A submerged swimmer in the pool sees the tip of the triangle at what distance above the water? Let the indices of refraction nwater = 1.33 and nair = 1.00.

What is a lever used for?