Physics, 10.12.2021 01:00, kayleevilla
1.A lever does 765 J of work and the person using the lever applies 900 J of work. What is the efficiency of the lever?
2.When your car gets a flat tire, you need to use a jack to lift the car. The car requires only 9000 J of work to lift it, but due to the inefficiency of the jack, you need to put in 15,000 J of work to lift the car. What is the efficiency of the jack?
3.An automobile gasoline engine can do 225 J of work with each stroke of its pistons. If the engine has an efficiency of 30%, what is the amount of work that must be done on the pistons in the engine?
Answers: 1
Physics, 22.06.2019 02:10, lunnar2003
How many hydrogen (h) atoms are in one molecule of sulfuric acid, h2so4? (1 points) 1 2 4 7
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Physics, 22.06.2019 07:50, singhmanny3526
The ratio of lift to drag l/d for a wing or airfoil is an important aerodynamic parameter, indeed, it is a direct measure of the aerodynamic efficiency of the wing. if a wing is pitched through a range of angle of attack, l/d first increases, then goes through a maximum, and then decreases. consider an infinite wing with an naca 2412 airfoil. estimate the maximum value of l/d. assume that the reynolds number is 9x10^6.
Answers: 2
Physics, 22.06.2019 11:10, myamiller558
Rank the automobiles based on the magnitude of the force needed to stop them, from largest to smallest.2000 kg car going 5m/s500 kg car going 20 m/s1000 kg car going20m/s500 kg car going10m/s1000 kg car going10/s4000 kg car going 5m/s 0 0 603
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Physics, 22.06.2019 15:50, janeou17xn
Decreased sensitivity to an unchanging stimulus is known as
Answers: 3
1.A lever does 765 J of work and the person using the lever applies 900 J of work. What is the effic...
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