Detailed explanations plz, most are short. Whoever answers the most questions wi

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Detailed explanations plz, most are short. Whoever answers the most questions with good explanations earns the points:

1. A wooden beam 2 meters long with a mass of 5 kg is supported on two scales, one at the left end and the other one-half meter from the right end. A 10 kg weight is placed on the beam 0.2 m from the left end. What does the left side scale read?

a) 98 N     b) 73 N     c) 49 N     d) 36 N     e) 25 N

2. A four meter long teeter totter, balanced at the middle, has a 20 kg kindergartner on one end. How far to the right of the center do you place a 100 kg teacher so as to balance the teeter totter?

a) 0.3 m     b) 0.4 m     c) 0.5 m     d) 0.6 m     e) 0.7 m

3. A 50 kg sofa 3 m long is carried by Joe and Jim who hold it at the ends. A 40 kg child jumps on the sofa 0.5 m from Joe. What weight does Joe carry?

a) 310 N     b) 572 N     c) 641 N     d) 713 N     e) 882 N

4. A 100 kg sofa 3 m long is carried by James and Sarah. James has the end, Sarah is holding the sofa 0.5 m from the other end. Some moron places a 50 kg box of books on the sofa on the very end of the sofa Sarah is holding. How much weight is Sarah holding now?

a) 290 N     b) 870 N     c) 1180 N     d) 1310 N     e) 1470 N

5. A 6 m long 20 kg ladder leans against a frictionless wall at an angle of 60o. What is the minimum coefficient of friction between the ladder and the floor?

a) 0.1         b) 0.2         c) 0.3         d) 0.4         e) 0.5

6. A 3 m long 10 kg ladder leans against a frictionless wall at 75o. How large must the frictional force be to hold the ladder up?

a) 10 N       b) 15 N       c) 20 N       d) 25 N       e) 30 N

7. A 6 m long 50 kg ladder leaning on a frictionless wall can successfully be scaled by a 120 kg man. The coefficient of friction with the floor is 0.5. What is the minimum angle between the ladder and the floor?

a) 55o          b) 60o          c) 65o          d) 70o          e) 75o

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