PHYS 1111 Intro Physics I Mechanics Nguyen Spring 2015 Homework 10 Daniel Hernandez Due date Fri Apr 10 11 59 59 pm 2015 EDT It is predicted that gradual warming of the Earth over the next century will cause substantial portions of the Greenland and Antarctic ice sheets to melt How will this affect the Earth s moment of inertia A Earth s moment of inertia will not change B Earth s moment of inertia will decrease C Earth s moment of inertia will increase You are correct Your receipt no is 156 3673 How will this affect the amount of time in one day A The day length will increase B The day length will not change C The day length will decrease A playground merry go round spins about its axis with negligible friction A child moves from the center of the merrygo round to the rim For this system indicate which of the following quantities change Choices Changed Unchanged Potential energy Rotational kinetic energy Mass Moment of inertia Angular speed Angular momentum You are correct Your receipt no is 156 98 You are correct Your receipt no is 156 5126 Consider the two rotating systems shown below Each one consists of a small dense mass m attached to a rod of negligible mass and length L The rod is pivoted about one end In one of the systems the mass is attached to the free end of the rod in the other system the mass is attached to the rod s midpoint The rods are released from rest in the horizontal position at the same time When the rod on the left reaches the vertical position approximately where is the rod to the right The L shaped object in the figure below consists of three masses m1 9 03 kg m2 1 14 kg and m3 2 34 kg connected by light rods of length L1 1 11 m and L2 1 82 m y m1 L1 m2 A B C L2 m3 x What torque must be applied to this object to give it an angular acceleration of 1 20 rad s2 if it is rotated about the x axis A C past vertical B A not yet vertical C B at vertical You are correct Your receipt no is 156 2751 You are correct Your receipt no is 156 838 What torque must be applied to this object to give it an angular acceleration of 1 20 rad s2 if it is rotated about the y axis You are correct Your receipt no is 156 6247 What torque must be applied to this object to give it an angular acceleration of 1 20 rad s2 if it is rotated about the z axis which is through the origin and perpendicular to the page You are correct Your receipt no is 156 9434 PHYS 1111 Intro Physics I Mechanics Nguyen Spring 2015 Homework 10 Daniel Hernandez The arm in the figure below weighs 35 3 N A 1170 N uniform boom is supported by a cable perpendicular to the boom as seen in the figure below The force of gravity acting on the arm acts through point A Assume that L1 0 0710m L2 0 295m and 12 7o Determine the magnitude of the tension force Ft in the deltoid muscle You are correct Your receipt no is 156 9350 Determine the magnitude of the tension force Fs of the shoulder on the humerus upper arm bone to hold the arm in the position shown You are correct Your receipt no is 156 9136 Determine the angle of tension force Fs relative to the x axis You are correct Your receipt no is 156 87 The boom is hinged at the bottom and an m 2190 N weight hangs from its top Assume the angles to be 60 2o and 90 0o Find the tension in the supporting cable Incorrect Tries 5 8 Find the x components of the reaction force exerted on the boom by the hinge choose to the right as positive Tries 0 8 Find the y components of the reaction force exerted on the boom by the hinge choose upwards as positive Tries 0 8 PHYS 1111 Intro Physics I Mechanics Nguyen Spring 2015 Homework 10 Daniel Hernandez Axis 60 hrwc11p51 A uniform thin rod of length 0 40 m and mass 6 5 kg can rotate in a horizontal plane about a vertical axis through its center The rod is a rest when a 3 0 g bullet traveling in the horizontal plane of the rod is fired into one end of the rod As viewed from above the direction of the bullet velocity makes an angle of 60 with the rod see the figure If the bullet lodges in the rod and the angular velocity of the rod is 8 0 rad s immediately after the collision what is the magnitude of the bullet s velocity just before impact You are correct Your receipt no is 156 7869 Printed from LON CAPA MSU Licensed under GNU General Public License
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