PHYS 1111 Intro Physics I Mechanics Nguyen Spring 2015 Homework 06 Daniel Hernandez Due date Fri Mar 6 11 59 59 pm 2015 EST A car goes around a curve on a road that is banked at an angle of 30 0 Even though the road is slick the car will stay on the road without any friction between its tires and the road when its speed is 24 2 m s What is the radius of the curve 103 m A popular ride at amusement parks is illustrated in the figure below You are correct Your receipt no is 156 9468 q You are driving your car over a circular shaped bump in the road that has a radius of curvature of 51 3 m x v r If the car is traveling at a constant speed of 14 4 m s calculate the apparent weight of your 69 2 kg passenger as you pass over the top of the bump 399 1 N In this ride people sit in a swing that is suspended from a rotating arm Riders are at a distance of x 10 6 m from the axis of rotation and move with a speed of 26 0 mi h Calculate the centripetal acceleration of the riders 12 7 m s 2 You are correct Your receipt no is 156 3074 You are correct Your receipt no is 156 7306 What is the maximum speed that you can drive the car over the top of the bump without losing contact with the road 22 4 m s Calculate the angle the supporting wires make with the vertical 52 4 degrees You are correct Your receipt no is 156 7057 You are correct Your receipt no is 156 2017 Determine whether each of the following statements is true or false T F F T F T Choices True False A massive elephant can have less kinetic energy than a lightweight gazelle Motor A does twice the work as motor B Therefore motor A produces twice as much power as motor B Static friction does no work on an object Friction can do positive work on an object Only the net force acting on an object can do work A slow moving elephant can have more kinetic energy than a fast moving cheetah You are correct Your receipt no is 156 2064 PHYS 1111 Intro Physics I Mechanics Nguyen Spring 2015 Homework 06 Daniel Hernandez A certain amount of work W is required to accelerate a motorcycle from rest to a speed v How much work is required to accelerate the same motorcycle from rest up to a speed v 3 A 8W 9 B W 4 C W 10 D W 9 E W 3 You are correct Your receipt no is 156 1620 A 1100 kg car coasts on a horizontal road with a speed of 16 3 m s After crossing an unpaved sandy stretch of road 31 1 m long its speed decreases to 14 6 m s Was the net work done on the car positive negative or zero A The network done on the car was zero B The net work done on the car was negative C The network done on the car was positive You are correct Your receipt no is 156 8401 Calculate the magnitude of the average net force on the car in the sandy section 929 N You are correct Your receipt no is 156 2046 Water skiers often ride to one side of the center line of a boat as shown in the figure below v q In this case the ski boat is traveling at 15 0 m s and the tension in the rope is 76 5 N If the boat does 3260 J of work on the skier in 50 8 m what is the angle between the tow rope and the center line of the boat 33 degrees You are correct Your receipt no is 156 6917 c7p64 An initially stationary 4 2 kg object accelerates horizontally and uniformly to a speed of 15 m s in 3 0 s In that 3 0 s interval how much work is done on the object by the force accelerating it 472 J You are correct Your receipt no is 156 8834 What is the instantaneous power due to that force at the end of the interval 315 W You are correct Your receipt no is 156 8395 What is the instantaneous power due to that force at the end of the first half of the interval 158 W You are correct Your receipt no is 156 6230 Printed from LON CAPA MSU Licensed under GNU General Public License
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