Module #4 – Unit TestPhysics 1401 Question 1What is the angular speed in rad/s of the second hand of a watch?Select one:A. 1.7 × 10–3 rad/sB. 0.10 rad/s C. 0.02 rad/sD. 6.28 rad/sE. 60 rad/sQuestion 2An airplane engine starts from rest; and 2 seconds later, it is rotating with an angularspeed of 420 rev/min. If the angular acceleration is constant, how many revolutions does the propeller undergo during this time?Select one:A. 7 B. 14C. 21D. 49E. 150Question 3A satellite follows a circular path with constant speed around a planet. Which one of the following quantities is constant and non-zero for this satellite?Select one:A. linear velocityB. angular velocity C. centripetal accelerationD. angular accelerationE. total accelerationQuestion 4Complete the following statement: When a net torque is applied to a rigid object, it always produces aSelect one:A. constant acceleration.B. rotational equilibrium.C. constant angular velocity.D. constant angular momentum.E. change in angular velocity. Question 5Complete the following statement: A body is in translational equilibriumSelect one:A. only if it is at rest.B. only if it is moving with constant velocity.C. only if it is moving with constant acceleration.D. if it is either at rest or moving with constant velocity. E. if it is moving with either constant velocity or constant acceleration.Question 6Consider the following four objects: a hoop, a flat disk, a solid sphere, and a hollow sphere. Each of the objects has mass M and radius R. The axis of rotation passes through the center of each object, and is perpendicular to the plane of the hoop and the plane of the flat disk. Which of these objects requires the largest torque to give it the same angular acceleration?Select one:A. the solid sphereB. the hollow sphereC. the hoop D. the flat diskE. both the solid and the hollow spheresQuestion 7A child wants to pump up a bicycle tire so that its pressure is 1.2 × 105 Pa above thatof atmospheric pressure. If the child uses a pump with a circular piston 0.035 m in diameter, what force must the child exert?Select one:A. 120 N B. 89 NC. 76 ND. 54 NE. 240 NQuestion 8The two dams are identical with the exception that the water reservoir behind dam A extends twice the horizontal distance behind it as that of dam B. Which one of the following statements regarding these dams is correct?Select one:A. The force exerted by the water on dam A is greater than that on dam B.B. The force exerted by the water on dam B is greater than that on dam A.C. Dam A is more likely to collapse than dam B if the water level rises.D. Dam B is more likely to collapse than dam A if the water level rises.E. The horizontal distance of the water behind the two dams does not determine the force on them. Question 9Complete the following sentence: The operation of a hydraulic jack is an application ofSelect one:A. Pascal's principle. B. Bernoulli's principle.C. Archimedes' principle.D. irrotational flow.E. the continuity equation.Question 10Which one of the following statements concerning the buoyant force on an object submerged in a liquid is true?Select one:A. The buoyant force depends on the mass of the object.B. The buoyant force depends on the weight of the object.C. The buoyant force is independent of the density of the liquid.D. The buoyant force depends on the volume of the liquid displaced. E. The buoyant force will increase with depth if the liquid is incompressible.Question 11A curtain hangs straight down in front of an open window. A sudden gust of wind blows past the window; and the curtain is pulled out of the window. Which law, principle, or equation can be used to explain this movement of the curtain?Select one:A. Poiseuille's lawB. Bernoulli's equation C. the equation of continuityD. Archimedes' principleE. Pascal's principleQuestion 12A baseball pitcher throws the ball in a motion where there is rotation of the forearm about the elbow joint as well as other movements. If the linear velocity of the ball relative to the elbow joint is 10.0 m/s at a distance of 0.410 m from the joint and the moment of inertia of the forearm is 0.500 kg*m2, what is the rotational kinetic energy of the forearm in Joules?Answer:148.7Question 13Suppose you have a coffee mug with a circular cross section and vertical sides (uniform radius). What is its inside radius if it holds 400.0 g of coffee when filled to a depth of 6.00 cm? Assume coffee has the same density of water. Answer in cm.Answer:4.6Question 14What force (N) must be exerted on the master cylinder of a hydraulic lift to support the weight of a 2300.0 kg car resting on the slave cylinder? The master cylinder has a 1,70 cm diameter, while the slave's is 24.0 cm.Answer:113.1Question 15Hoover Dam generates electricity with water taken from a depth of 100.0 m and with an average flow rate of 6.20 x 102 m3/s. Calculate the power in this flow in
View Full Document
Unlocking...