PHYS 1401 Module Two Exam 1 A spaceship is observed traveling in the positive x direction with a speed of 150 m s when it begins accelerating at a constant rate The spaceship is observed 25 s later traveling with an instantaneous velocity of 1500 m s at an angle of 55o above the x axis What was the magnitude of the acceleration of the spaceship during the 25 seconds A 7 3 m s s B 57 m s s C 1 5 m s s D 28 m s s E 48m s s 2 When the net force that acts on a hockey puck is 12 N the puck accelerates at a rate of 48 m s s determine the mass of the puck A 0 25 kg B 1 0 kg C 2 5 kg D 2 0 kg E 5 0 kg A book is resting on the surface of a table Consider the following four forces that arise in this situation 1 the force of the earth pulling on the book 2 the force of the table pushing on the book 3 the force of the book pushing on the table 4 the force of the book pulling on the earth Which two forces form an actionreaction pair that obeys Newton s third law A 2 and 4 B 1 and 3 C 1 and 4 D 3 and 4 E 1 and 2 The wheels of an automobile are locked as it slides to a stop from an initial speed of 30 0 m s If the coefficient of kinetic friction is 0 600 and the road is horizontal approximately how long does it take the car to stop A 5 10 s B 10 4 s C 4 22 s D 15 3 s E 8 75 s A 4 kg block is connected by means of a massless rope to a 2 kg block that is hanging over the edge of a table The rope is threaded through a pulley that extends out over the edge of the table Complete the following statement If the 4 kg block is to begin sliding the coefficient of static friction between the 4 kg block and the surface must be don t forget about the inertia of both blocks A Greater than 2 B Less than 0 5 but greater than zero C Greater than 0 5 but less than 1 D Less than zero E Greater than 1 but less than 2 3 4 5 6 A 71 kg man stands on a bathroom scale in an elevator What does the scale read if the elevator is ascending with an acceleration of 3 0 m s s A 910 N 7 8 9 10 11 12 13 B 480 N C 830 N D 140 N E 690 N A stone is thrown horizontally from the top of a cliff One second after it has left you hand its vertical distance below the cliff is A 10 m B 5 m C 15 m If the speed of a record player remains constant while your pet hamster moves twice as far from the center the its linear speed A Halves B Remains the same C Doubles Compared to the mass of a certain object on earth the mass of the same object on the moon is A More B Less C The same A block is dragged without acceleration in a straight line path across a level surface by a force of 6 N What is the force of friction between the block and the surface A Less than 6 N B Need more information to say C More than 6 N D 6 N A pair of tennis balls fall through the air from a tall building One ball is regular and the other is filled with lead pellets The ball to reach the ground first is the A Regular ball B Lead Filled C Same for both A Mack truck and a Volkswagon Beetle traveling at the same speed collide head on The impact force is greatest on the A Not enough information is given B It s the same for both C Truck D Beetle An ordinary workshop grindstone has a radius of 9 50 cm and rotates at 7000 0 rpm Calculate the centripetal acceleration at its edge in m s s and convert it to multiples of g Answer 5 21e3 14 A fairground ride spins its occupants inside a flying saucer snapped container If the horizontal circular path the riders follow has an 8 00 m radius at how many revolutions per minute will the riders be subjected to a centripetal acceleration whose magnitude is 1 50 times that due to gravity Answer 12 9 rev min if answer is wrong enter 14 9 rev min instead