P=? 1200 lb 7777 If the coefficient of friction is 0.28, determine the force, P, necessary to cause the block to begin to slide. 1) Force P = 2) If the Force P is 300 lb, what minimum coefficient of friction would be needed to keep the block from moving? P = ? 38 。 1250 lb 3) What force would be necessary to push the block up the incline if the coefficient of friction is 0.31? 4) What force would be necessary to pull the block down the incline if the coefficient of friction is 0.31? Focus

You are learning to play the violin. One end of the string is vibrating from the bow running along one end. The other end is tied down. The length of the string we will be looking at is 30 cm and the total mass of the string is 0,32 g. We will be modeling this as a standing wave on a string. You being to play the violin and play a note which has a frequency of 440 Hz. You (having incredible eyesight) see that there are 3 anti-nodes on the string forming a perfect sinusoidal wave (shown in diagram). L i) What is the wavelength of this standing wave? ii) What is the speed of the traveling waves that make up this standing wave? iii) What is the tension of the string? iv) Suppose you increase the tension of the string until you get a new standing wave. Will this standing wave have two antinodes or four antinodes? Explain. (You are still at a frequency of 440 Hz)

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Answer the problem in the picture