4. [-11.81 Points] OSCOLPHYSZO164.4.WA.022. ASK YOUR TEACHER You hold your physics textbook in your hand. (Assume that no other objects are in contact with the book.) (a) Identify the forces acting on the book. (Select all that apply.) [3 book on hand C] hand on book C] oor on book C] earth on book (b) For each force you identified in part (a), indicate the direction. (If a force is not applicable, choose NA.) book on hand hand on book oor on book earth on book (c) Identify the forces acting on your hand. (Select all that apply.) [3 book on hand [3 hand on book C] oor on hand [3 earth on hand (d) For each force you identified in part (c), indicate the direction. (If a force is not applicable, choose NA.) book on hand hand on book oor on hand earth on hand (e) Identify the forces that form the action-reaction pair as dened by Newton's third law. em on hand hand on book 5. [11.81 Points] - OSCOLPHYSZO16 4.4.WA.024. ASK YOUR TEACHER In each of the diagrams below, one or more external forces act on the indicated system. Which of the forces listed below are the reaction to the external force mentioned? (Select all that apply.) (a) the mower exerts a force _ downward on the Earth due to gravitational attraction downward on the ground due to contact upward and to the left on the handle A upward on the Earth due to gravitational attraction upward on the ground due to contact 7. [-/1.81 Points] DETAILS OSCOLPHYSZO16 4.5.P.019. | MY NOTES (a) Calculate the tension (in N) in a vertical strand of spiderweb if a spider of mass 5.00 x 10'5 kg hangs motionless on it. E N (b) Calculate the tension (in N) in a horizontal strand of spiderweb if the same spider sits motionless in the middle of it much like the tightrope walker in the figure. 0 J' The strand sags at an angle of 14.0 below the horizontal. : N Compare this with the tension in the vertical strand (find their ratio). tension in horizontal strand = Z] tension in vertical strand 9. [l1.81 Points] OSCOLPHYSZO16 4.5.WA.035. ASK YOUR TEACHER Torn enlists the help of his friend John to move his car. They apply forces to the car as shown in the diagram. Here F1 = 427 N and F2 = 340 N and friction is negligible. In the diagram below, the mass of the car = 3500 kg, 91 = 25 and 92 = 12. (Assume the car faces the positive X-axis before the forces are applied.) (a) Find the resultant force (in N) exerted on the car. ('3) magnitude direction (counterclockwise from the +X-axis) What is the acceleration (in m/sz) of the car? magnitude direction (counterclockwise from the +x-axis) 10. [-/1.81 Points] DETAILS OSCOLPHYS2016 4.7.P.040. MY NOTES ASK YOUR TEACHER A flea jumps by exerting a force of 1.05 x 10- N straight down on the ground. A breeze blowing on the flea parallel to the ground exerts a force of 0.340 x 10- N on the flea. Find the direction and magnitude of the acceleration of the flea if its mass is 5.80 x 10 kg. Do not neglect the gravitational force. (Assume that the breeze blows in the +x-direction and that the +y-direction is up. ) magnitude m/s2 direction . counterclockwise from the +x-axis + 11. [-/1.9 Points] DETAILS OSCOLPHYS2016 4.7.P.046. MY NOTES ASK YOUR TEACHER A basketball player jumps straight up for a ball. To do this, he lowers his body 0.280 m and then accelerates through this distance by forcefully straightening his legs. This player leaves the floor with a vertical velocity sufficient to carry him 0.860 m above the floor. (a) Calculate his velocity (in m/s) when he leaves the floor. m/s (b) Calculate his acceleration (in m/s") while he is straightening his legs. He goes from zero to the velocity found in part (a) in a distance of 0.280 m. m /s 2 (c) Calculate the force (in N) he exerts on the floor to do this, given that his mass is 118 kg. N +