Give examples of friction being useful and not useful in everyday life

A wave's frequency is 2Hz and its wavelength is 4 m. What is the wave's speed?

In a semiclassical model of the hydrogen atom, the electron orbits the proton at a distance of 0.053 nm. part a what is the electric potential of the proton at the position of the electron? express your answer with the appropriate units.

As an acapulco cliff diver drops to the water from a height of 42.0 m, his gravitational potential energy decreases by 27,500 j. what is the diver's weight in newtons?

Which is the best description of our solar system's current location in the milky way? a. in the halo b. in the nucleus c. in a major spiral arm d. between major spiral arms

Two capacitors, C1 and C2, are connected in series across a source of potential difference. With the potential source still connected, a dielectric is now inserted between the plates of capacitor C1.

If the volume of a hot air balloon remains constant, what happens as the temperature of the air inside the balloon increases?

What is the correct formula for electrical power? l

Bernie drove home from a vacation in 1.5 hours. He traveled a total distance of 60 miles. What was his average speed in miles per hour

What advice a personal trainer most likely give u before a workout

An elevator supported by a single cable descends a shaft at a constant speed. The only forces acting on the elevator are the tension in the cable and the gravity. Which one of the following statements is correct? Group of answer choices A.