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 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_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_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 1.2 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_forwardFor 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_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_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_forwardA force F = (40, -80) N acts on a mass of 4 kg. At time t = 0 s, the mass has a velocity v0 = (-2, -4) m/s.What are the (x,y) components of the velocity vector (in m/s) after 2 seconds?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_forward
- Consider this situation: A police officer arrives at the scene of an accident and finds a load of straw bales partly on the back of a pickup truck and partly on the hood of a Jaguar sedan. Both vehicles are facing in the same direction. The pickup is in front of the Jaguar. The truck driver claims that she was stopped at the stop sign when the Jag drove into the back of her truck. The Jaguar driver claims that he was stopped behind the pickup when the truck suddenly backed up. Given this information decide whether each statement is true or false. True If the vehicles were both moving (truck in reverse and car forward), the pickup must have been moving faster. True The pickup could have backed into the Jaguar. False These results are impossible. The bales would have fallen forward in this type of accident. True Regardless of fault, the apparent motion of the bales results from them seeking the natural state of rest. True There is not enough information to determine who is at fault.…arrow_forwardIn a head-on collision, a car stops in 0.14 ss from a speed of 11 m/sm/s . The driver has a mass of 90 kgkg , and is, fortunately, tightly strapped into his seat. What force is applied to the driver by his seat belt during that fraction of a second?arrow_forwardIn the amusement park ride known as Magic Mountain Superman, powerful magnets accelerate a car and its riders from rest to 38.4 m/s in a time of 8.90 s. The mass of the car and riders is 3.46 × 103 kg. Find the average net force exerted on the car and riders by the magnets.arrow_forward
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