On a windy day, a quarterback throws a football into the wind. After the football has left the quarterback's hand and is moving through the air, the correct list of the force(s) acting on the football is ... a) a force from the throw and the downward force of gravity. b) a force from the throw, a force exerted by the air, and gravity. c) a force from the throw, and a force exerted by the air. a force exerted by the air, and the downward force of gravity. (p
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- 32. Suppose your car was mired deeply in the mud and you wanted to use the method illustrated in Figure 4.36 to pull it out. (a) What force would you have to exert perpendicular to the center of the rope to produce a force of 12,000 N on the car if the angle is 2.00°? In this part, explicitly show how you follow the steps in the Problem-Solving Strategy for Newton’s laws of motion. (b) Real ropes stretch under such forces. What force would be exerted on the car if the angle increases to 7.00° and you still apply the force found in part (a) to its center?The diagram shows three coplanar forces acting on an object. Calculate the acting on the object: (a) total vertical force. (b) total horizontal force. (c) resultant force. 40 N 50 N 40° 60 NA 50-kg traffic light is suspended from two wires making angles of 1=53, and 2 = 37 with thehorizontal axis. Find the tension T1 and T2 on the wires. Note that the values are given to two significantfigures.
- Do you need to continue applying force on an object to keep it moving? Explain why.36... Three rugby players are pulling horizontally on ropes attached to a box, which remains stationary. Player 1 exerts a force F₁ equal to 1.00 × 10² N at an angle ₁ equal to 60.0° with respect to the + direction (Figure 4-27). Player 2 exerts a force F2 equal to 2.00 × 10² N at an angle 02 equal to 37.0° with respect to the + direction. The view in the figure is from above. Ignore friction and note that gravity can be ignored in this problem. (a) Determine the force F3 exerted by player 3. State your answer by giving the components of F3 in the directions perpendicular to and parallel to the positive a direction. (b) Redraw the diagram and add the force F3 as carefully as you can. (c) Player 3's rope breaks, and player 2 adjusts by pulling with a force of magnitude F₂ equal to 1.50 × 10² N at the same angle as before. In which direction is the acceleration of the box relative to the + direction shown? (d) In part (c) the magnitude of the acceleration is measured to be 10.0 m/s².…Suppose one's hand exerts a force of 15 N upward on a book weighing 12 N. The reaction to the force of the hand on the book is a force of12 N exerted by the book on the hand.3 N exerted by the book on the hand. 15 N exerted by the book on the hand.12 N exerted by the book on the Earth.10 N exerted by the Earth on the book.
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