College Physics 1 FINAL EXAM QUESTIONS AND ANSWERS SUCCESS GUARANTEED.

You swing a bat and hit a heavy box with a force of 1500 N. The force the box exerts on the bat is? - correct answer exactly 1500 N whether or not the box moves When a rigid body rotates about a fixed axis, all the points in the body have the same - correct answer angular acceleration A 1000.0 kg car is moving at a 15 km/hr. If a 2000.0 kg truck has 18 times the kinetic energy of the car, how fast is the truck moving? - correct answer 45 km/hr (use KE= 1/2mV^2) A ball drops some distance and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential energy did the ball lose? - correct answer less than 30 J A box of mass m is pressed against (but is not attached to) an ideal spring of force constant k and negligible mass, compressing the spring a distance x. After it is released, the box slides up a frictionless incline as shown in the figure and eventually stops. If we repeat this experiment but instead use a spring having force constant 2k - correct answer All of the above choices are correct: the box will go up the incline twice as high as before; just as it moves free of the spring, the kinetic energy of the box will be twice as great as before; just as it moves free of the spring, the speed of the box will be the sqaure root of 2 times greater as before Is it possible for a system to have negative potential energy? - correct answer Yes, since the choice of the zero of potential energy is arbitrary Two objects having masses m1 and m2 are connected to each other as shown in the figure and are released from rest. There is no friction on the table surface or in the pulley. The masses of the pulley and the string connecting the objects are completely negligible. What must be true about the tension T in the string just after the objects are released? - correct answer Tm2g If the temperature of a fixed amount of an ideal gas is increased, it necessarily follows that - correct answer the speed of the gas molecules will increase Two objects are thrown from the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit the street? - correct answer they are traveling at the same speed The motions of a car and a truck along a straight road are represented by the velocity-time graphs in the figure. The two vehicles are initially alongside each other at t=0. At time T, what is true about these two vehicles since t=0? - correct answer the truck will have traveled further than the car Suppose that an object is moving with constant nonzero acceleration. Which of the following is an accurate statement concerning its motion? - correct answer in equal times its velocity changes by equal amounts An object is moving to the right, and experiencing a net force that is directed to the right. The magnitude of the force is decreasing with time. The speed of the object is - correct answer increasing A car is being towed at constant velocity on a horizontal road using a horizontal chain. The tension in the chain must be equal to the weight of the car in order to maintain constant velocity. - correct answer False A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the car. During the collision - correct answer the force on the truck due to the collision is exactly equal to the force on the car Two objects, each of weight W, hang vertically by spring scales as shown in the figure. The pulleys and the strings attached to the objects have negligible weight, and there is no appreciable friction in the pulleys. The reading in each scale is - correct answer W A box slides down a frictionless plane inclined at an angle θ above the horizontal. The gravitational force on the box is directed - correct answer vertically For general projectile motion, when the projectile is at the highest point of its trajectory - correct answer its velocity is perpendicular to the acceleration If the eastward component of vector A is equal to the westward component of vector B and their northward components are equal. Which one of the following statements about these two vectors is correct? - correct answer The magnitude of vector A is equal to the magnitude of vector B A zookeeper is trying to shoot a monkey sitting on top of a tree with a tranquilizer gun. If the monkey drops from the tree at the same instant that the zookeeper fires, where should the zookeeper aim if he wants to hit the monkey? (neglect air resistance) - correct answer Aim straight at the monkey If the acceleration of an object is negative, the object must be slowing down - correct answer false A heavy boy and a light girl are balanced on a massless seesaw. If they both move forward so that they are one-half their original distance from the pivot point, what will happen to the seesaw? - correct answer Nothing will happen, the seesaw will be balanced A 4.0 kg object is moving with a speed of 2.0 m/s. A 1.0 kg object is moving with a speed of 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greatr distance before stopping? - correct answer Both objects travel the same distance (their kinetic energies are the same 8 J) If a force always acts perpendicular to an object's direction of motion, that force cannot change the object's kinetic energy. - correct answer True Two objects, one of mass m and the other of mass 2m, are dropped from the top of a building. If there is no air resistance, when they hit the ground - correct answer the heavier one will have twice the kinetic energy of the lighter one You carry a 7.0 kg bag of groceries 1.2 m above the ground at constant speed across a 2.7 m room. How much work do you do on the bag in the process? - correct answer 0 J Two stones, one of mass m and the other of mass 2m, are thrown directly upward with the same velocity at the same time from ground level and feel no air resistance. Which statement about these stones is true? - correct answer At its highest point, the heavier stone will have twice as much gravitational potetional energy as the lighter one because it is twice as heavy A mole of oxygen (O2) molecules and a mole of carbon dioxide (CO2) molecules at the same temperature and pressure have - correct answer the same number of molecules As the speed of a moving fluid decreases, the pressure in the fluid - correct answer increases Which inequality best describes a fluid flow in a level (h1=h2) pipe of diameter D1 that becomes constricted - correct answer D1D2; V1V2; P1P2 An ideal fluid flows through a pipe of variable cross section without any friction. The fluid completely fills the pipe. As the fluid traverses the pipe, it has a constant - correct answer total energy Salt water is more dense than fresh water. A ship floats in both fresh water and salt water. Compared to the fresh water, the volume of salt displaced by the ship is - correct answer less than the volume of fresh water A rock is under water in a shallow lake. As the rock sinks deeper and deeper into water, the buoyant force on it - correct answer remains constant A merry-go-round is spinning at a rate of 3.0 revolutions per minute. Cora is sitting 1.0 m from the center of the merry-go-round and cameron is sitting right on the edge 2.0 m away from the center. What is the relationship between the rotational speeds of the two children? - correct answer the speeds are the same