A train consists of a 50 Mg engine and three cars, each having a mass of 30 Mg . If it takes 90 s for the train to increase its speed uniformly to 45 km/h , starting from rest, determine the force T, developed at the coupling between the engine E and the first car A. The wheels of the engine provide a resultant frictional tractive force F which gives the train forward motion, whereas the car wheels roll freely. Express your answer with the appropriate units.
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Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.
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Physics, 22.06.2019 14:00
Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.
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A10nc charge sits at a point in space where the magnitude of the electric field is 1500 n/c. what will the magnitude of the field be if the 10 nc charge is replaced by a 20 nc charge? assume the system is big enough to consider the charges as small test charges.
Answers: 1
A train consists of a 50 Mg engine and three cars, each having a mass of 30 Mg . If it takes 90 s fo...
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