Sarah and maria made a telephone using two cans and a string. they pulled the string tight and maria went out into the hallway. when maria spoke into her can, sarah could hear her because the sound waves
a) travelled through a vacuum.
eliminate

b) travelled from the cold hallway to the much warmer classroom.

c) travelled from the vibrating can through the string to the other can.

d) travelled through the air from maria to sarah even though they were in different places.

Eddy whose mass is 55kg climbs up the 1.50 meter high stairs in 2s. calculate eddy’s power rating

Acylinder with a movable piston contains 11.7 moles of a monatomic ideal gas at a pressure of 1.32×10^5 pa. the gas is initially at a temperature of 300 k. an electric heater adds 43200 j of energy into the gas while the piston moves in such a way that the pressure remains constant. cp=20.79 j k^−1 mol^−1 for a monatomic ideal gas, and that the number of gas molecules is equal to avogadro's number (6.022×10^23) times the number of moles of the gas. (a) what is the temperature of the gas after the energy is added? (b) what is the change in volume of the gas? (c) how much work is done by the gas during this process?

Which lists the organs in the correct order as food passes from the mouth to anus?