Physics, 03.04.2020 22:03 StephanieQueen2003
A train car with mass m1 = 618.0 kg is moving to the right with a speed of v1 = 7.9 m/s and collides with a second train car. The two cars latch together during the collision and then move off to the right at vf = 4.8 m/s. 1) What is the initial momentum of the first train car? 2) What is the mass of the second train car? 3) What is the change in kinetic energy of the two train system during the collision? 4)Now the same two cars are involved in a second collision. The first car is again moving to the right with a speed of v1 = 7.9 m/s and collides with the second train car that is now moving to the left with a velocity v2 = -5.6 m/s before the collision. The two cars latch together at impact. What is the final velocity of the two-car system? (A positive velocity means the two train cars move to the right
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Physics, 22.06.2019 05:30
Iwill give 30 points to whoever answers ! what is the formula for actual mechanical advantage and ideal mechanical advantage?
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Physics, 22.06.2019 12:30
Consider a 1000 w iron whose base plate is made of 0.5 cm thick aluminum alloy 2024-t6 (ρ = 2770 kg/m3 and cp = 875 j/kg°c). the base plate has a surface area of 0.03 m2. initially, the iron is in thermal equilibrium with the ambient air at 22°c. assuming 90% of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200°c.
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Physics, 22.06.2019 14:20
4r-134a enters the condenser of a residential heat pump at 800 kpa and 50°c at a rate of 0.022 kg/s and leaves at 750 kpa subcooled by 3°c. the refrigerant enters the compressor at 200 kpa superheated by 4°c determine (a) the isentropic efficiency of the compressor, (b) the rate of heat supplied to the heated room, and (c) the cop of the heat pump. also, determine (d) the cop and rate of heat supplied to the heated room if this heat pump operated on the ideal vapor-compression cycle between the pressure limits of 200 and 800 kpa. (0.757, 4.37 kw, 5.12, 6.18, 3.91 kw)
Answers: 3
Physics, 22.06.2019 17:30
Frequency of electromagnetic waves that a radio station is assigned is called
Answers: 1
A train car with mass m1 = 618.0 kg is moving to the right with a speed of v1 = 7.9 m/s and collides...
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