QUESTION 10 8 points Save Answer A polished pumice stone has a weight density of 40.02 lb/ft^3 (Hint: you need to do some conversion for this problem) (a) What is the weight of this stone? (b) If it is immersed in water (weight density 62.4 lb/f1^3), what is the bouyant force exerted by the water on the pumice stone? (c) What is the net force on the stone? (Magnitude and direction) (d) Will the stone sink or float? For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). BIUS Paragraph Arial 10pt ... QUESTION 11 2 points Save Ansy Two waves that move at the same speed, must have the same wavelength and frequency can have different wavelengths and different frequencies can have variable frequency but same wavelength because all wave pulses are the same can have different wavelength but same frequency because they both oscillate at the same rate QUESTION 12 2 points Save Ans If an object that is denser than water is placed on the surface of a pool it will always sink it will always float whether it sinks or floats depends on the mass of the object whether it floats or sinks depends on the size of the object QUESTION 13 2 points Save Ans You shout at a cliff and you hear your echo 2 seconds after. If the speed of sound is 340 m/s, how far is the cliff from you? 340 m 170 m 680 m impossible to determine without knowing the frequency QUESTION 14 2 points Save Ans Two rods, A and B, have lengths L and 2L. They are made of the same material so the coefficient of linear expansion is the same for both. If they are heated by the same amount, what can we say about the cahnge in length of each? They expand the same amount. Rod A expands twice the amount of rod B. Rod B expands twice the amount of A. We can only say something about the expansion if we are given the coefficient of linear expansion