b) Choose the quantity below that is a scalar. C) the acceleration of an object in uniform circular motion 0 the velocity of an object moving at a constant speed in the +2 direction O the acceleration due to Earth's gravity 0 the force per meter applied by a spring when deformed c) At what point in its path is a projectile moving the slowest? (i.e., with its lowest speed) 0 Right after it's launched 0 At half its maximum height 0 At its apex 0 Just before it hits the ground sf d) True or false: when traveling at a constant speed, our acceleration around a curve is 0. 0 True 0 False J e) Mass is often defined as "a measure of how much matter is in an object." After taking PHV 291, how might you update your definition of the word mass? O The property of an object that resists (or doesn't resist) acceleration/changes to its motion Q How heavy something is, which depends on the local gravitational acceleration O The property of an object that allows it to interact centripetally with other objects that have mass O Going to stick with "amount of matter in an object" thx you very much, weird purplerhaired physics lady sf f) Of the examples below, which is NOT a Newton's Third Law pair? O A truck is pulling a trailer. The truck's engine exerts a force that accelerates the trailer, the trailer exerts a force on the truck resisting the motion 0 A projectile has been launched into the air. Aerodynamic drag exerts a force equal in magnitude and opposite in direction to the applied force, resulting in no net force in the x direction. 0 My phone is resting on the couch, its weight exerting a force that depresses the cushion. The cushion pushes back in equal and opposite measure, a normal force acting to support the phone O [toss a brick into the air. Earth exerts a gravitational force on the brick, and the brick exerts a gravitational force on the Earth X g) Raindrops falling from clouds 6500 feet above Earth's surface spend the latter parts of their descent at constant speed. Why? Q g is basically constant the closer you get to Earth's surface 0 They've reached terminal velocity 0 Their speed is constant, but their velocity has been changing the entire way down 0 They were at a constant speed the entire time sf h) Curious, physics department faculty leave a scale in the Petty building elevator. When, and why, do students riding in the elevator who stand on the scale have the highest weight readings on the scale? Q When descending, because the net force on the scale is your weight plus the downward force of the elevator's motion 0 When descending, because 9 and the elevator's acceleration are in the same direction 0 when ascending, because 9 and the elevator's acceleration are in the same direction Q When the elevator is ascending, because the net force on the scale is your weight plus your mass times the upward acceleration i) In baseball, sometimes it's actually faster to run to a base than to slide to it. Why? 0 pk is greater than p5; when a runner slides, they experience greater friction than just running 0 pg is greater than pk, so this actually isn't even true O pg is greater than H, but when sliding, so much surface area is in contact for so long, the cumulative effect is to greatly slow the player down C) Air drag is always lower than static or kinetic friction, so staying in the air is better than sliding across the ground 5) It's the end of the academic year, and you're moving out of your dorm room/apartment. As you pack books into boxes, what does the work you're doing (in a physics 291 sense...) NOT depend on? 0 whether you move the books straight into the box or move them on a curved path 0 the mass of the books 0 how high the shelves are that the books were on relative to the box 0 the weight of the books