Author: Anonymous

A sled on ice moves in the ways described in questions 1-7 below. Friction is so small that it can be ignored. A person wearing spiked shoes standing on the ice can apply a force to the sled and push it along the ice. Choose the one force (A through G) which would keep the sled moving as described in each statement below. Across the 7 questions, you may use a choice more than once or not at all, but choose only one answer for each. If you think that none is correct, answer choice J. Question 1: Which force would keep the sled moving toward the right and speeding up at a steady rate (constant acceleration)?

Questions 14-21 refer to a toy car which can move to the right or left along a horizontal line (the positive part of the distance axis). Assume that friction is so small that it can be ignored. A force is applied to the car. Choose the one force graph (A through H) for the statement below which could allow the described motion of the car to continue. You may use a choice more than once or not at all. If you think that none is correct, answer choice J. Question 17: The car moves toward the left (toward the origin) with a steady (constant) velocity.

Questions 14-21 refer to a toy car which can move to the right or left along a horizontal line (the positive part of the distance axis). Assume that friction is so small that it can be ignored. A force is applied to the car. Choose the one force graph (A through H) for the statement below which could allow the described motion of the car to continue. You may use a choice more than once or not at all. If you think that none is correct, answer choice J. Question 18: The car moves toward the right and is slowing down at a steady rate (constant acceleration).

Questions 22-26 refer to a toy car which can move to the right or left on a horizontal surface along a straight line (the + distance axis). The positive direction is to the right. Different motions of the car are described below. Choose the letter (A to G) of the acceleration-time graph which corresponds to the motion of the car described in each statement. You may use a choice more than once or not at all. If you think that none is correct, answer choice J. Question 24: The car moves toward the left (toward the origin) at a constant velocity.

Questions 11-13 refer to a coin which is tossed straight up into the air. After it is released it moves upward, reaches its highest point and falls back down again. Use one of the following choices (A through G) to indicate the force acting on the coin for each of the cases described below. Answer choice J if you think that none is correct. Ignore any effects of air resistance. A.  The force is down and constant.B.  The force is down and increasing.C.  The force is down and decreasing.D.  The force is zero.E.  The force is up and constant.F.  The force is up and increasing.G.  The force is up and decreasing. Question 12: The coin is at its highest point.

This problem statement applies to questions 44-47: A sled is pulled to the top of a hill. The sketch above indicates the shape of the hill. At the top of the hill the sled is released from rest and allowed to coast down the hill. At the bottom of the hill the sled has a speed v and a kinetic energy E (the energy due to the sled’s motion). Answer the following questions. In every case friction and air resistance are so small they can be ignored. Question 47: For the higher hill that is less steep, how does the kinetic energy of the sled at the bottom of the hill after it has slid down compare to that of the original hill? A. The kinetic energy of the sled at the bottom is greater for the higher but less steep hill.B. The kinetic energy of the sled at the bottom is the same for both hills.C. The kinetic energy at the bottom is greater for the original hill.D. There is not enough information given to say which kinetic energy is greater.J. None of these descriptions is correct.

A sled on ice moves in the ways described in questions 1-7 below. Friction is so small that it can be ignored. A person wearing spiked shoes standing on the ice can apply a force to the sled and push it along the ice. Choose the one force (A through G) which would keep the sled moving as described in each statement below. Across the 7 questions, you may use a choice more than once or not at all but choose only one answer for each. If you think that none is correct, answer choice J. Question 6: The sled is slowing down at a steady rate and has an acceleration to the right. Which force would account for this motion?

How many sets of smooth-muscle fibers are found within the lamina propria?

A right shift of the Pressure-Volume curve indicates that lung compliance has: 

A parasagittal plane would best be described as: