Concept explainers
Texas Motor Speedway On October 28, 2000 Gil de Ferran set the single-lap average speed record for the then-named California Speedway –241.428 mi /h. The following year, on April 29, 2001, the Championship Auto Racing Teams (CART) organization canceled the inaugural Firestone Firehawk 600 race at the Texas Motor Speedway 2 hours before it was to start. During practice, drivers became dizzy when they reached speeds of more than 230 mph on the high-banked track. The Texas Motor Speedway has turns banked at
In qualifying runs for the race, 21 of 25 drivers complained of dizziness and disorientation. They experienced accelerations of
The average speed reported in the reading passage has six significant digits, implying that the speed is known to within
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- It has been suggested dial rotating cylinders about 20 km in length and 8 km in diameter be placed in space and used as colonies. The purpose of the rotation is to simulate gravity for the inhabitants. Explain this concept for producing an effective imitation of gravity.arrow_forwardA rotating space station is said to create "artificial gravity"—a loosely-defined term used for an acceleration that would be crudely similar to gravity. The outer wall of the rotating space station would become a floor for the astronauts, and centripetal acceleration supplied by the floor would allow astronauts to exercise and maintain muscle and bone strength more naturally than in non-rotating space environments. If the space station is 200 m in diameter, what angular velocity would produce an "artificial gravity" of 9.80 m/s2 at the rim?arrow_forwardSuppose a mass is moving in a circular path on a frictionless table as shown in figure. In the Earth's frame of reference, there is no centrifugal force pulling the mass away from the centre of rotation, yet there is a very real force stretching the string attaching the mass to the nail. Using concepts related to centripetal force and Newton's third law, explain what force stretches the string, identifying its physical origin. Figure 6.35 A mass attached to a nail on a frictionless table moves in a circular path. The force stretching the string is real and not fictional. What is the physical origin of the force on the string?arrow_forward
- An ordinary workshop grindstone has a radius of 7.50 cm and rotates at 6500 rev/min. (a) Calculate the magnitude of the centripetal acceleration at its edge in meters per second squared and convert it to multiples of g.arrow_forward8. In a type of amusement park ride sometimes called the “Gravitron”, the people are spun around inside a large cylinder. If the rate of rotation is great enough the rider may “stick” to the inside wall of the cylinder with their feet not touching the floor. Suppose the radius of the cylinder is 2.0 m and that it rotates with a frequency of 1.1 Hz. (a) Determine the speed of a rider. (b) Determine the centripetal acceleration of a rider. (c) The force causing this acceleration is what type and exerted by what? (d) Determine the coefficient of friction that is necessary to keep a rider from sliding down the wall.arrow_forwardA cyclist turn with a radius of 50m at a speed of 10m/s 1. What is the cyclist acceleration? 2. If the cyclist and cycle have a combined mass of 120 kg, what is the force causing them to turn?arrow_forward
- PHYSICS GR12 PROBLEM Saturn rotates once in 645 min and has a mass of 5.69 x 1026kg. Suppose that scientists have placed a satellite in orbit around Saturn that has the same period as Saturn. Calculate the radius at which the satellite must orbit.arrow_forwardImagine a car is turning around a corner, it will slide off the road if it is turning at a very fast speed. Use what you have learned about friction and circular motion to explain why.arrow_forwardChris tied a 902g rock to a rope and swung it above his head, making 35 complete revolutions in two minutes. The distance from his head to the rope is 82 cm. Determine the centripetal force experienced by the rock.arrow_forward
- 1. Helicopters have small propeller on their tail to keep them from rotating in the opposite direction of their main lifting blades. Explain in terms of Newton's third law why the helicopter body rotates in the opposite direction to the blades. 2. Explain why centripetal acceleration changes the direction of velocity in circular motion but not its magnitude.arrow_forwardCentripetal Acceleration The rotating platform is not friction free. Friction will cause an angular acceleration that will cause the platform to slow down. How will this acceleration effect your measurements of the centripetal acceleration (or, if it has no effect, why not )? If you are sitting one meter from the center of a merry go round which spins at 3 RPM, you have to hold on or you will fall off. Which situation will require you to hold on the hardest: continuing to spin 3 RPM, buy holding on at 2 meters from the center, or continuing to hold on at 1 meter from the center but spinning 6 RPM? (Why? What formula are you using?)arrow_forward5. The rear wheels of DeMarius' car complete of a rotation for every full rotation of a front wheel. What is the radius, in feet, of a rear wheel on the car? Write your answer as a simplified fraction.arrow_forward
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