You have been hired as an expert witness by an attorney for a trial involving a traffic accident. The attorney’s client, the plaintiff in this case, was traveling castbound toward an intersection at 13.0 m/s as measured just before the accident by a roadside speed meter, and as seen by a trustworthy witness. As the plaintiff entered the intersection, his car was struck by a northbound driver, the defendant in this case, driving a car with identical mass to the plaintiff’s. The vehicles stuck together after the collision and left parallel skid marks at an angle of θ = 55.0° north of east, as measured by accident investigators. The defendant is claiming that he was traveling within the 35-mi/h speed limit. What advice do you give to the attorney?
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Chapter 9 Solutions
Physics for Scientists and Engineers with Modern Physics
- A drone is being directed across a frictionless ice covered lake. The mass of the drone is 1.50 kg, and its velocity is 3.00i ^ m/s . After 10.0 s, the velocity is 9.00i ^ + 4.00j ^ m/s . If a constant force in the horizontal direction is causing this change in motion, find (a) the components of the force and (b) the magnitude of the force.arrow_forwardA 0.350 kg hammer is moving horizontally at 5.50 m/s when it strikes a nail and comes to rest after driving the nail 1.00 cm into a board. Assume constant acceleration of the hammer-nail pair. (a) Calculate the duration of the impact (in s). 0.036 (b) What was the average force (in N) exerted on the nail? (Enter the magnitude.) 52.9375 X Narrow_forwardA 3 kg object has a velocity of 3i m/sat one instant. 8 seconds later, its velocity is (5i + 7j) m/s. Assuming the object was subject to a constant Net Force, (a) find the components of the force as well as (b) its magnitude?arrow_forward
- For sport, a 12 kg armadillo runs onto a large pond of level, frictionless ice. The armadillo’s initial velocity is 5.0 m/s along the positive direction of an x axis.Take its initial position on the ice as being the origin. It slips over the ice while being pushed by a wind with a force of 17 N in the positive direction of the y axis. In unitvector notation, what are the animal’s (a) velocity and (b) position vector when it has slid for 3.0 s?arrow_forwardParticle physicists have identified a type of fundamental particle called a muon, which effectively behaves like a very heavy electron. Imagine a muon of mass 1.88 × 10-28 kg is observed in a particle accelerator. It has an initial speed of 3.50 × 105 m/s. It moves in a straight line, and its speed increases to 1.25 × 106 m/s in a distance of 75.0 cm. Assume that the acceleration is constant. Find the magnitude of the force exerted on the muon.arrow_forwardThe figure shows Atwood's machine, in which two containers are connected by a cord (of negligible mass) passing over a frictionless pulley (also of negligible mass). At time t = 0 container 1 has mass 1.2 kg and container 2 has mass 2.7 kg, but container 1 is losing mass (through a leak) at the constant rate of 0.21 kg/s. At what rate is the acceleration magnitude of the containers changing at (a)t = 0 and (b)t = 5 s? (c) When does the acceleration reach its maximum value? (a) Number (b) Number (c) Number Units Units Units Click if you would like to Show Work for this question: Open Show Workarrow_forward
- A constant horizontal force of 32 N pushes a 20 kg-mass through a medium that resists its motion with 0.4 N for every m/s of speed. The initial velocity of the mass is 8 m/s in the direction opposite to the direction of the applied force. Find the velocity of the mass after 30 seconds. 39.59 X m/sarrow_forwardThe figure shows Atwood's machine, in which two containers are connected by a cord (of negligible mass) passing over a frictionless pulley (also of negligible mass). At time t = 0 container 1 has mass 1.4 kg and container 2 has mass 3.1 kg, but container 1 is losing mass (through a leak) at the constant rate of 0.16 kg/s. At what rate is the acceleration magnitude of the containers changing at (a)t = 0 and (b)t = 3 s? (c) When does the acceleration reach its maximum value? m2 (a) NumberTo.04 UnitšTm/s^3 (b) Number To.006 Unitsm/s^3 le) Number e to search 10:45 PM ENG 4/4/2021 13) 16 1home 17 %23 4 7. R. T. 00 16 3.arrow_forwardA robot with fancy wheels is trained to move in two directions simultaneously. The force in the forward direction is 10 N and the force in the horizontal direction is 8 N. If the robot starts from rest, has a mass of 75 kg and travels for 100 seconds, what is the magnitude of the robot's final displacement?arrow_forward
- The figure shows Atwood's machine, in which two containers are connected by a cord (of negligible mass) passing over a frictionless pulley (also of negligible mass). At time t = 0 container 1 has mass 1.6 kg and container 2 has mass 2.9 kg, but container 1 is losing mass (through a leak) at the constant rate of 0.12 kg/s. At what rate is the acceleration magnitude of the containers changing at (a)t = 0 and (b)t = 4 s? (c) When does the acceleration reach its maximum value? (a) Number i 0.547 (b) Number i c) Number I m1 Units Units Units m2 This answer has no units <arrow_forwardAn electron is a subatomic particle (m = 9.11 x 1031 kg) that is subject to electric forces. An electron moving in the +x direction accelerates from an initial velocity of +5.72 x 105 m/s to a final velocity of 2.64 x 106 m/s while traveling a distance of 0.0783 m. The electron's acceleration is due to two electric forces parallel to the x axis: F1 = 9.44 x 10-17 N, and F2, which points in the -x direction. Find the magnitudes of (a) the net force acting on the electron and (b) the electric force F2. F F FF Voarrow_forwardIn a two-dimensional tug-of-war, Alex, Betty, and Charles pull horizontally on an automobile tire at the angles shown in the picture. The tire remains stationary in spite of the three pulls. Alex pulls with force ₁ of magnitude 201 N, and Charles pulls with force Fc of magnitude 184 N. Note that the direction of Fc is not given. What is the magnitude of Betty's force F if Charles pulls in (a) the direction drawn in the picture or (b) the other possible direction for equilibrium? 149⁰ Alex Charles Betty (a) Number i (b) Number i Units Unitsarrow_forward
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