Question 1 (1 point) You are riding in a car moving with constant velocity with your seat belt fastened. The driver sees an obstacle, and brakes heavily. What happens next? 0 The seat belt exerts a fictitious force on you to slow you down with the car. 0 You feel a force throwing you forward. This is a real force caused by the braking of the car. 0 You feel a force throwing you forward. This is a fictitious force caused by the braking of the car. 0 You feel a force throwing you forward. This is a real force caused by your inertia. Question 2 (1 point) You are in a rocket accelerating upward relative to Earth at 2g. If you were on a scale, how would the reading compare to your normal weight? 0 zero 0 2 times normal 0 3 times normal 0 Same as normal Question 3 (1 point) A ball suspended on a string can be used as an accelerometer. If such an accelerometer was constructed in a car, and a rider observed that the string made an angle of 150 backward with the vertical, what is the acceleration of the car? :F15.0 O the centripetal acceleration is tripled Question 9 (1 point) A fitness centre provides a centrifuge to help dry bathing suits after use. The spinner rotates clockwise, as shown. If the spinner were made to rotate counter-clockwise, the centripetal acceleration would reverse its direction. direction of rotation '1' Question 10 (1 point) A 1.0-kg and a 2.0-kg mass are each tied to the ends of identical strings and whirled around in circles that describe a horizontal plane. The larger mass moves with a speed of 3.2 m/s. For the tension in the two strings to be the same, the smaller mass must be moving with a speed of Question 4 (1 point) When making a left-hand turn, a bicyclist must lean into the turn at an angle to the vertical. Question 5 (1 point) A car is driving around a banked curve. A student sketches the FBD shown for the car. The force of static friction should be horizontal. Question 6 (1 point) A boat is moving at a constant velocity when a ball is placed on the floor. The ball remains at rest for a time. Then, the ball accelerates forward with respect to the boat. Which statement is true? 0 The boat is increasing speed in a straight line. 0 The boat is decreasing speed in a straight line. 0 The boat is increasing speed while turning. O The boat is decreasing speed while turning. Question 7 (1 point) An aerobatic airplane is stressed for a maximum of 10g acceleration. During a loop, the pilot pulls the airplane around the bottom of the loop with a radius of 0.100 km. What is the maximum speed permitted at the bottom of the loop? 0 31.3 m/s Question 7 (1 point) An aerobatic airplane is stressed for a maximum of 10g acceleration. During a loop, the pilot pulls the airplane around the bottom of the loop with a radius of 0.100 km. What is the maximum speed permitted at the bottom of the loop? 0 31.3 m/s 0 70.0 m/s 0 93.9 m/s 0 99.0 m/s Question 8 (1 point) A ball is tied to the end of a string and whirled around a table in a horizontal circle. If the speed is doubled, how does the centripetal acceleration change? 0 the centripetal acceleration is unchanged 0 the centripetal acceleration is quadrupled O the centripetal acceleration is doubled O the centripetal acceleration is tripled Question 9 (1 point) A fitness centre provides a centrifuge to help dry bathing suits after use. The spinner rotates clockwise, as shown. It the spinner were made to rotate counter-clockwise, the centripetal acceleration would reverse its direction. direction of rotation