Question

11) 3. Vllal is Le LEISIUI III IUPEI Pung upuvalu UI UIULNU! B. In the figure below, blocks A and B are the same mass at rest on a frictionless surface. How do the apparent weights of the blocks compare? How do the horizontal gravitational components compare? 9. Annika loves moving sofas. She wants to move her 40 kg sofa to a different room. The Rope 1 relevant coefficient of kinetic friction is 0.3. She pushes at a steady speed. How much force is she applying to the sofa? 10. Consider the Atwood's machine to the right. If the mass m is greater than 100 kg, so that the Rope 2 100 kg block accelerates upward, is the tension T in the rope greater than 980 N? What if Question 7 mis equal to 100 kg. What if m is less than 100 kg? 11. John is in an elevator that's moving up and speeding up. Is his apparent weight greater than or less than his actual weight? What if the elevator is slowing down? What if the elevator is moving at a steady speed? What if the elevator is in free fall? 12. If a mosquito is hit by John's sick ride, does his sick ride impart a greater force to the mosquito than the mosquito to the sick ride? Or does the mosquito Question 8

Please do questions 8 and 9 if you answer this. the figure for question 8 is on the bottom right.

Answer 1

Solution Given fgane No NI nguse, 10 Normals So'? NI mg cos8 N2. Ion Taho N/Ccostost) hotizental compenents sin 82 T- sin82 T= mg sine, (7) Gren sihahon is ohere dis4o F Fr stady speed F f- 0.3x40 x9-8118 NV