Physics, 22.09.2020 15:01 abigailcayton
A physics student stands on a cliff overlooking a lake and decides to throw a tennis ball to her friends in the water below. She throws the tennis ball with a velocity of 19.5 m/s at an angle of 36.5∘ above the horizontal. When the tennis ball leaves her hand, it is 15.5 m above the water. How far does the tennis ball travel horizontally before it hits the water? Neglect any effects of air resistance when calculating the answer.
Answers: 3
Physics, 22.06.2019 01:00
15. give an example for some particles or waves that are moving faster than light in everyday life 16. what is a laser? 17. what is an oscilloscope? 18. what does it means practically that nothing is faster than light in vacuum? 19. what is vacuum?
Answers: 2
Physics, 22.06.2019 03:30
As part of an industrial process, air as an ideal gas at 10 bar, 400k expands at steady state through a valve to a pressure of 4 bar. the mass flow rate of air is 0.5 kg/s. the air then passes through a heat exchanger where it is cooled to a temperature of 295k with negligible change in pressure. the valve can be modeled as a throttling process, and kinetic and potential energy effects can be neglected. (a) for a control volume enclosing the valve and heat exchanger and enough of the local surroundings that the heat transfer occurs at the ambient temperature of 295 k, determine the rate of entropy production, in kw/k. (b) if the expansion valve were replaced by an adiabatic turbine operating isentropically, what would be the entropy production? compare the results of parts (a) and (b) and discuss.
Answers: 3
Physics, 22.06.2019 07:20
Samir watches a 100-minute movie on his spaceship. maria's spaceshipe flies in the same direction as samir's spaceship but she observes his move to last 125 minutes and his spaceship to be 40 m long. how long does samir observe his own spaceship to be? according to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does marias voyage take according to samir?
Answers: 3
A physics student stands on a cliff overlooking a lake and decides to throw a tennis ball to her fri...
History, 06.11.2020 22:50
Mathematics, 06.11.2020 22:50
Mathematics, 06.11.2020 22:50
Mathematics, 06.11.2020 22:50
History, 06.11.2020 22:50
Mathematics, 06.11.2020 22:50
History, 06.11.2020 22:50
Mathematics, 06.11.2020 22:50
Mathematics, 06.11.2020 22:50
Physics, 06.11.2020 22:50
English, 06.11.2020 22:50
Computers and Technology, 06.11.2020 22:50
English, 06.11.2020 22:50
Chemistry, 06.11.2020 22:50