Two strings both vibrate at exactly 819 hz. the tension in one of them is then increased slightly. as a result, six beats per second are heard when both strings vibrate. what is the new frequency of the string that was tightened?

Explanation:

The beat frequency between 2 frequencies and is given by the formula . Since increasing the tension of a string means higher frequency, we will assume we did this with the string vibrating at , so we can write because , which means , and for our values this is:

this a false

explanation:

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.