Sarah is standing on top of a very tall building and decides to drop a ball off of it. Two seconds later, she throws another ball straight down. What speed should Sarah throw the second ball such that the two balls meet 10 seconds from when the first ball was released?

Astring that is fixed at both ends has a length of 1.05 m. when the string vibrates at a frequency of 91.0 hz, a standing wave with five loops is formed. (a) what is the wavelength of the waves that travel on the string? (b) what is the speed of the waves? (c) what is the fundamental frequency of the string?

Amira pulls a 3 pound wagon 4 feet. how much work has she done?

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.