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A 3560 N horse pulls a 1500 N sled along a level snow.covered path. The horse exerts a constant horizontal force of magnitude 600 N on the sled via a rope which has negligible mass. A constant sliding frictional force acts on the sled, as it slides along the ground. The horse and the sled accelerate in the positive x direction at a rate of 3.00 m/s. The horse's feet do not slip on the ground as he pulls the sled along 26. The frictional force acting on the sled has a magnitude of A. 141 N B. 1059 N C. 459 N D. 600 N E 1500 N 27. The frictional force which the ground exerts on the horse's feet has a magnitude of A 1500 N B. 490 N C. 1090 N D. 1690 N E 459 N A student applies a constant force of 400 N directed 30 degrees below the horizontal and thereby slides a 350 N box of books along her dorm room floor. The coefficient of kinetic friction between the box and the floor is 0.350. 28. The acceleration of the box of books has a magnitude of A. 9.70 m2 C.4.31 m2 B. 5.39 m2 D. 6.27 27 m2: E. 777 77"
A 650 N student attaches a system of pulleys and cords to a 2400 N crate, as shown in the figure below. The student then exerts a constant 200 N force straight downwards on the rope at the left, as shown in the Figure. Assume that the pulleys and cords have negligible weight and that the pulleys are ideal and frictionless T1 T2 29. The tension T, equals A. 600 N B 1200 N C. 1800 N D. 2400 N E 3600 N 30. The crate's acceleration is A. 34.3. UP S B. 2.45 W/DOWN. C. 4.90 W, UP D. 7:35 DOWN E. ZERO OPTIONAL EXTRA CREDIT QUESTIONS: You may skip these 5 questions entirely, answer them in addition to questions in the main body of the exam, or answer them in place of questions in the main body of the exam. I will simply add up the number of correct answers which you submit, divide by 30, and multiply by 100% to obtain your exam score. It is possible to earn 116.67% on this exam! 31 True or Fake An object cannot be at rest at a certain instant and yet accelerating? A. TRUE B FALSE 32. True or False: The unit vector i has scalar y-componentequal to zero? A. TRUE B FALSE
An engineering student suspends his 400 N tool box by using a system of ropes and pulleys, as shown in the figure. The mass Mis equal to 36,0 kg The angle and the mass M2 have been chosen so that the entire system remains at rest. Assume that the pulleys are all ideal and frictionless, and that the cords have negligible weight Ay M2 MI TOOL BOX 33. The angle is equal to A. 48.6 B. 61.9" C. 35.0 D. 28.1 E 414 34 The mass M2 is equal to A. 40.8 kg B. 36.0kg C 544 kg D. 16.7 kg E 18.4 kg A 200 gram wooden block is placed on an inclined ramp and released from rest. The ramp is tilted at an angle of 35 degrees with the horizontal. The coefficient of static friction between the block and the ramp is 0.300 and the coefficient of kinetic friction is 0.200 7.35 35. The acceleration of the block has a magnitude of D. 6.90 A. 4,02 C 3.66 m B. 0.732 ) Ezero %