A dolphin emits ultrasound of 100kHz and uses the timings of reflection to determine the position of objects in the water. What is the wavelengths of this ultrasound? Note the speed of sound in water is 1480m/s.

How is the polarization of an electromagnetic wave defined? Group of answer choices The polarization is defined by the plane in which the magnetic field is oscillating. The polarization is defined by the direction the wave is traveling.

Why does a metal spoon feel colder than a wooden spoon at room temperature?

Technician A says mechanical efficiency is a comparison between brake horsepower and indicated horsepower.

Calculate the energy equivalent in joules of the mass of a proton. [Show all work, including the equation and substitution with units.]

Which statement about work and power correctly describes an automobile race? The car do different amount of work depending on how fast they finish.

The puzzle box is traditionally associated with the work of

A 0.95-kg sample of water at 11°C is in a calorimeter. You drop a piece of steel with a mass of 0.39 kg at 212°C into it.

Let the magnitudes of two displacement vectors be 4 m and 8 m, respectively. If the two vectors are added, the magnitude of the resultant vector. A. is exactly equal to 4 m. B. is exactly equal to 12 m. C. is greater than 12 m. D.

justin pushes basket of toys with 50N of force for 3 meters in 100 seconds. how much work did he do on the basket

In general, what can be said about metals.