For smaller buildings, engineers design elevators to travel slowly because it is more economical. An elevator driven by an electric motor carries a group of people, of total mass 900 kg, to the upper floor of the building. The mass of 900 kg accelerates uniformly from rest to a speed of 4 ms-1, in a time of 3 s, and continues at this speed until it is brought to rest by applying brakes. (i) Calculate the acceleration of the total mass and the force required to produce this acceleration.
Answers: 2
Physics, 21.06.2019 22:30, djs1671
Laboratory experiments, observational field studies, and model-building are all examples of different forms of scientific investigations. in what way do laboratory experiments primarily differ from other forms of scientific investigations? a. a laboratory experiment is the only accepted form of investigation within the scientific community. b. studies about how things behave in nature or studies involving very large objects are best answered through laboratory experiments. c. laboratory experiments involve the identification and control of variables. d. data can only be generated through laboratory experiments, not other forms of investigation.
Answers: 3
Physics, 22.06.2019 12:50, keilahsalmon
The vapour pressure of benzene is 53.3 kpa at 60.6 °c, but it fell to 51.5 kpa when 19.0 g of a non-volatile organic compound was dissolved in 500 g of benzene. calculate the molar mass of the compound.
Answers: 2
Physics, 22.06.2019 13:10, alejandramirand9836
A0.750 kg aluminum pan is removed from the stove and plunged into a sink filled with 10.0 kg of water at 293 k. the water temperature quickly rises to 297 k. what was the initial temperature of the aluminum pan? the specific heat of aluminum is ca = 900 j/(kgk) and water is cw = 4190 j/(kgk)
Answers: 3
Physics, 22.06.2019 19:10, mttttttthhhhhhh551
Due sun 06/09/2019 11: 59 pm skip navigation questions correct q 1 [1/1] correct q 2 [1/1] correct q 3 [1/1] untried q 4 (0/1) untried q 5 (0/1) untried q 6 (0/1) untried q 7 (0/1) untried q 8 (0/1) untried q 9 (0/1) untried q 10 (0/1) grade: 3/10 print version start of questions two cyclists, 42 miles apart, start riding toward each other at the same time. one cycles 2 times as fast as the other. if they meet 2 hours later, what is the speed (in mi/h) of the faster cyclist?
Answers: 1
For smaller buildings, engineers design elevators to travel slowly because it is more economical. An...
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