3. [#663a] Car physics, part 1.A car has a drag coefficient Ca = 0.30, a frontal area of A = 1.9 m² and a mass 1.2 tonnes. The density of air is 1.2kg.m-3.i) What is the drag force when it is traveling at v = 110 kph in a straight line? Fdrag_ N.Hint: Retain accurate values until the final calculation, but remember significant figures.Enter answer here4. [#663b] Car physics, part 1.A car has a drag coefficient Ca = 0.30, a frontal area of A = 1.9 m² and a mass 1.2 tonnes. The density of air is 1.2kg.m-3.ii) What power (in kilowatts) is required to overcome the drag force at this speed? ParagkW.Hint: Retain accurate values until the final calculation, but remember significant figures.Enter answer here

Given, drag coefficient, Cd = 0.30frontal area, A = 1.9 m2density of air is, ρ = 1.2 kg.m-3speed of…

Answered: A car has a drag coefficient Ca = 0.30,…

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter6: Uniform Circular Motion And Gravitation

Section: Chapter Questions

Problem 42PE: Unreasonable Result A mountain 10.0 km from a person exerts a gravitational force on him equal to...

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Imagine that nitrogen and other atmospheric gases were more soluble in water so that the atmosphere of the Earth is entirely absorbed by the oceans. Atmospheric pressure would then be zero, and outer space would start at the planets surface. Would the Earth then have a gravitational field? (a) Yes, and at the surface it would be larger in magnitude than 9.8 N/kg. (b) Yes, and it would be essentially the same as the current value. (c) Yes, and it would be somewhat less than 9.8 N/kg. (d) Yes, and it would be much less than 9.8 N/kg. (e) No, it would not.
Two identical isolated particles, each of mass 2.00 kg, are separated by a distance of 30.0 cm. What is the magnitude of the gravitational force exerted by one particle on the other?
Unreasonable Result A mountain 10.0 km from a person exerts a gravitational force on him equal to 2.00% of his weight. (a) Calculate the mass of the mountain. (b) Compare the mountain's mass with that of Earth. (c) What is unreasonable about these results? (d) Which premises are unreasonable or inconsistent? (Note that accurate gravitational measurements can easily detect the effect of nearby mountains and variations in local geology.)
A basin surrounding a drain has the shape of a circular cone opening upward, having everywhere an angle of 35.0 with the horizontal. A 25.0-g ice cube is set sliding around the cone without friction in a horizontal circle of radius R. (a) Find the speed the ice cube must have as a function of R. (b) Is any piece of data unnecessary for the solution? Suppose R is made two times larger. (c) Will the required speed increase, decrease, or stay constant? If it changes, by what factor? (d) Will the time interval required for each revolution increase, decrease, or stay constant? If it changes, by what factor? (e) Do the answers to parts (c) and (d) seem contradictory ? Explain.
1 A spaceship is traveling to the Moon. At what point is it beyond the pull of Earth's gravity?
5. A rocket weighing 1.5 tons, launched vertically upward from the Earth’s surface, rises with acceleration a = 1.5 g. Determine the speed of the jet of gases escaping from the nozzle if the fuel consumption is Δm/m = 25 kg / s.
37 - A firefighter, 50 meters from a burning building, shot the pressurized water coming out of the nozzle of the hose horizontally. It tightens at an angle of 30° on the top. If the velocity of the pressurized water is 40m/s. At what height does the water hit the building? a) Passes through without crashing B) 18,432 m/s NS) 9,216 m D) 18,432 m TO) 3,136 m
5. The barometer of a mountain hiker reads 14.7psi at the beginning of a hiking trip and 13.8psi at the end. Neglecting the effect of altitude on local gravitational acceleration, determine the vertical distance climbed. Assume an average air density of 1.20 kg/m^3. Draw also a figure or a free body diagram.
15- I. Newton.second/kilogramII. Watts/NewtonsIII.Joule/secondWhich of the above units can be used instead of speed unit? A) I and II B) Only I C) I, II and III D) Only II E) I and III
5.The gravitational field varies slightly at earth's surface. a.false b.maybe c.sometimes d.true
(II) Can cars “stop on a dime”? Calculate the acceleration of a 1400-kg car if it can stop from 35km/h on a dime ( diameter =1.7cm). How many g’s is this? What is the force felt by the 68-kg occupant of the car?
1. At which location is the Earth's gravity the strongest? * a. Inside the Earth b. At the Earth's surface c. At the north pole d. far from the Earth e. None of the above

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