Accident analysts. A 1500 kg sedan goes through a wide intersection traveling from north to south when it is hit by a 2200 kg SUV traveling from east to west. The two cars become enmeshed due to the impact and slide as one thereafter. On-the-scene measurements show that the coefficient of kinetic friction between the tires of these cars and the pavement is 0.75, and the cars slide to a half at a point 5.39 m west and 6.43 m south of the impact point. How fast was each car traveling just before the collision?
Accident analysts. A 1500 kg sedan goes through a wide intersection traveling from north to south when it is hit by a 2200 kg SUV traveling from east to west. The two cars become enmeshed due to the impact and slide as one thereafter. On-the-scene measurements show that the coefficient of kinetic friction between the tires of these cars and the pavement is 0.75, and the cars slide to a half at a point 5.39 m west and 6.43 m south of the impact point. How fast was each car traveling just before the collision?
Accident analysts. A 1500 kg sedan goes through a wide intersection traveling from north to south when it is hit by a 2200 kg SUV traveling from east to west. The two cars become enmeshed due to the impact and slide as one thereafter. On-the-scene measurements show that the coefficient of kinetic friction between the tires of these cars and the pavement is 0.75, and the cars slide to a half at a point 5.39 m west and 6.43 m south of the impact point. How fast was each car traveling just before the collision?
Emma and Katie are racing along in their new wagon. Upon reaching the bottom of the hill traveling at 13.2 m/s, Katie notices her teddy bear 12.0 m in front of them, panics and locks the brakes sending the wagon into a skid. If the wagon and its contents have a total mass of 1.50 x10^1 kg, and the coefficient of kinetic friction between the road and the rubber wagon tires is (0.75), by how much does the wagon miss the bear?
You have been called to testify as an expert witness in a trial involving a head-on collision. Car A weighs 1515 lb and was
traveling eastward. Car B weighs 1125 Ilb and was traveling westward at 45.0 mph. The cars locked bumpers and slid eastward
with their wheels locked for 22.5 ft before stopping. You have measured the coefficient of kinetic friction between the tires
and the pavement to be 0.750. How fast (in miles per hour) was car A traveling just before the collision? (This problem uses
English units because they would be used in a U.S. legal proceeding.)
speed of car A:
mph
Your forehead can withstand a force of about 6.0 kN before fracturing, while your cheekbone can withstand only about 1.3 kN. Suppose a 140 g baseball traveling at 40 m/s strikes your head at an angle of 20 degrees from the horizontal. The forehead can undergo a displacement of roughly about 0.75mm before a fracture and the cheekbone only about 0.2mm.
What is the magnitude of the force that stops the baseball?
What force does the baseball exert on your head? Explain.
Are you in danger of a fracture if the ball hits you in the forehead? On the cheek?
What is the time interval necessary for either the forehead or cheek bone to break based on the forces stated?
University Physics with Modern Physics (14th Edition)
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