The speed of sound in aluminum 6420 m/s and in brass it is 4700 m/s.  From this information we can infer that _____.

A human can tolerate about 750 kPa of pressure while diving under water.  How deep could a person dive in seawater (ρ = 1024 kg/m3)?

A ping pong ball can be suspended in a tilted stream of fast-moving air because the air near the top surface of the ball is _____ than the air near the bottom surface of the ball.

The frequency of the fourth harmonic standing wave on a string fixed at both ends is ______ the frequency of the second harmonic standing wave on the same string.

(5 pts) The frequency fold of the fundamental standing wave on a cello string is 20% higher than the desired frequency fnew that is, fold = 1.20fnew. How should the tension T in the string be adjusted so that the fundamental standing wave has frequency fnew?

Two wave pulses are sent down a very long rope.  The first wave has a smaller amplitude than the second one.  Which of the following is true?  The bigger wave will _____

Water flows smoothly through the pipe shown in the figure, which gets progressively wider as it descends in elevation from sections 1 and 2 down to sections 3 and 4. The water flow speed is _____ and the pressure is _____.  

A block of plastic has a mass of 50 g and a volume of 40 cm3. Will the block sink or float in water ( ρ = 1.0 g/cm3)? It will _____.

When 35.0 g of water is cooled by 40.0 °C, how much heat is released? 

The following reaction is an example of an _______ reaction. 2N2(g) + O2(g) → 2N2O(g)   ΔHrxn =  +163.2 kJ