Diploma Trimester 1/2017, Unit Test 1 BIOMEDICAL SCIENCE Physics for Life Sciences Time allowed: 1 hours and 30 mins Section A - Multiple Choice Questions (Answer all the questions) Section B - Short Answer Questions (Answer any four questions) Total: 70 Marks 10 Marks 60 Marks Section A – Multiple Choice Questions 01. If the distance d (in meters) traveled by an object in time t (in seconds) is given by the formula d = A + Bt2, the SI units of A and B must be A. meters for both A and B. B. m/s for A and m/s2 for B. C. meters for A and m/s2 for B. D. m/s2 for both A and B. 02. Which of the following statements is true for an inelastic collision? (There may be more than one correct choice.) A. Both momentum and kinetic energy are conserved. B. Momentum is conserved, but kinetic energy is not conserved. C. Kinetic energy is conserved, but momentum is not conserved. D. The amount of momentum lost by one object is the same as the amount gained by the other object. E. The amount of kinetic energy lost by one object is the same as the amount gained by the other object. 03. A mass of 1.0 x 10-3 µkg is the same as A. 10-12g B. 10-6g C. 1 kg D. 1 mg 04. A horizontal pull P pulls two wagons over a horizontal frictionless floor, as shown in Figure. The tension in the light horizontal rope connecting the wagons is A. equal to P, by Newton’s third law. B. equal to 2000 N. C. greater than P. D. less than P. 05. A cannonball is fired toward a vertical building 400 m away with an initial velocity of 100 m/s at 42 ° above the horizontal. The ball will hit the building in A. 4.0 s. B. 5.0 s. C. less than 4.0 s. D. more than 5.0 s. Section B – Short Answer Questions (Answer any four questions) 01. A subway train starts from rest at a station and accelerates at a rate of 1.6 m/s2 for 14.0 s. It runs at constant speed for 70.0 s and slows down at a rate of 3.50 m/s2 until it stops at the next station. (i) Find the total distance covered. (ii) Sketch a velocity time graph for the above motion (Total = 15 Marks) 02. A grasshopper leaps into the air from the edge of a vertical cliff, as shown in Figure 3.38. Use information from the figure to find (a) the initial speed of the grasshopper and (b) the height of the cliff. (Total = 15 Marks) 03. Two boxes are connected by a light string that passes over a light, frictionless pulley. One box rests on a frictionless ramp that rises at 30.0° above the horizontal (see Figure 5.50), and the system is released from rest. (a) Make free-body diagrams of each box. (b) Which way will the 50.0 kg box move, up the plane or down the plane? Or will it even move at all? Show why or why not. (c) Find the acceleration of each box. (Total = 15 Marks) 04 Suppose you want to place a weather satellite into a circular orbit 300 km above the earth’s surface. What speed, period, and radial acceleration must it have? The earth’s radius is 6380 km and its mass is 5.98 x 1024 kg. (Total = 15 Marks) 05. At a construction site, a pallet of bricks is to be suspended by attaching a rope to it and connecting the other end to a couple of heavy crates on the roof of a building, as shown in Figure. The rope pulls horizontally on the lower crate, and the coefficient of static friction between the lower crate and the roof is 0.666. (a) What is the weight of the heaviest pallet of bricks that can be supported this way? Start with appropriate free-body diagrams. (b) What is the friction force on the upper crate under the conditions of part (a)? (Total = 15 Marks)
