The speakers in a sports stadium are 89.5 m from a fan's seat. How much
time does it take sound to travel from
the speakers to the fan's seat?
Speed of sound = 343 m/s
(Unit = s)

This is also one I am confused on

Photoelectrons with a maximum speed of 6.50 x 107 m/s are ejected from a surface in the presence of light with a frequency of 6.75 x 1014hz. if the mass of an electron is 9.10 x 10-31 kg, calculate in joules the maximum kinetic energy of a single electron. 3.84 x 10-15 j 1.92 x 10-15 j 5.92 x 10-23 j 3.07 x 10-16 j

In a good thermo flask the main cause of heat loss is

The amount of potential energy possessed by an elevated object is equal to what?