2. Sharp curves especially in hill roads use barriers so that speeding cars that lose control will be prevented from falling (see diagram below). The radius of curvature is 8 meters, in a sign before the curve, the maximum speed imposed is 40kph (km/hr). A. The average midsize sedan weighs about 1500kg. The coefficient of friction between rubber and concrete is 0.45 when wet and 0.60 when dry. Is the speed limit reasonable? Justify and support your answer with calculations. (Expand space for answers) B. If you will impose a traffic rule in the said area, what should be the speed limit and other reminders that you will put as a sign? (Expand space for answers)

2. Sharp curves especially in hill roads use barriers so that speeding cars that lose control will be prevented from falling (see diagram below). The radius of curvature is 8 meters, in a sign before the curve, the maximum speed imposed is 40kph (km/hr). A. The average midsize sedan weighs about 1500kg. The coefficient of friction between rubber and concrete is 0.45 when wet and 0.60 when dry. Is the speed limit reasonable? Justify and support your answer with calculations. (Expand space for answers) B. If you will impose a traffic rule in the said area, what should be the speed limit and other reminders that you will put as a sign? (Expand space for answers)

Inquiry into Physics

8th Edition

ISBN:9781337515863

Author:Ostdiek

Publisher:Ostdiek

Chapter2: Newton's Laws

Section: Chapter Questions

Problem 10P: . The Kingda Ka roller coaster in New Jersey is the world’s tallest ride of its kind. As the...

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. The Kingda Ka roller coaster in New Jersey is the world’s tallest ride of its kind. As the passenger cars are launched from rest at the start, they are accelerated uniformly to a speed of 57 m/s (128 mph) in just 3.5 s. (a) What is the acceleration experienced by passengers on this ride in m/s2? In g’s? (b) If a certain passenger has a mass of 65 kg, what is the force in newtons that acts on him during the launch phase of this ride? What is the force in pounds?
Astronauts walking on the Moon are seen bounding rather than walking normally. Why?
A bag of sugar weighs 5.00 lb on Earth. What would it weigh in newtons on the Moon, where the free-fall acceleration is one-sixth that on Earth? Repeat for Jupiter, where g is 2.64 times that on Earth. Find the mass of the bag of sugar in kilograms at each of the three locations.
Suppose you are driving a car at a high speed. Why should you avoid slamming on your brakes when you want to stop in the shortest possible distance? (Newer cars have antilock brakes that avoid this problem.)
A small piece of Styrofoam packing material is dropped from a height of 2.00 m above the ground. Until it reaches terminal speed, the magnitude of its acceleration is given by a = g Bv. After falling 0.500 m, the Styrofoam effectively reaches terminal speed and then takes 5.00 s more to reach the ground. (a) What is the value of the constant B? (b) What is the acceleration at t = 0? (c) What is the acceleration when the speed is 0.150 m/s?
A number of amusement parks have rides that make loops like the one shown in Figure 6.33. For safety, the cars are attached to the rails in such a way cannot fall off. If the car goes over the top at just the right speed, gravity alone will supply the centripetal force. What other force acts and what is its direction if: (a) The car goes over the top at faster than this speed? (b) The car goes this speed? Figure 6.33 Amusement rides with a vertical loop are an example of a form of curved motion.
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1. The force of gravity is twice as great on a 2.0-kg rock as on a 1.0-kg rock. Why does the 2.0-kg rock not fall with twice the acceleration?
A 1500-kg car drives around a flat 25-m-radius circular track at 10 m/s (approximately 22 mph). What is the magnitude of the friction force on the car, in KN (kilo Newtons)? The coefficients of friction between the tire and the road on a dry day are µs = 1.0 and µk= 0.80. Use g = 10 m/s2.
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1. What is the magnitude of the pumpkin's acceleration during the first part of the fall? 2. What is the strength of the drag force while the pumpkin falls with terminal speed?