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How efficient is a machine that outputs 67J when 150J of work are input?
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What is the power of a cyclist when she overcomes a resistive force of 30N in order to cycle 30m. It takes her 6 seconds to cycle this distance.?
gqya
If the potential energy of a swing is 200 J at its highest point and 50 J at its lowest point what is the kinetic energy of the swing at its lowest point if mechanical energy is conserved?
150J, as the potential energy has been converted to kinetic energy as the swing accelerates downwards (and forwards) from the top of its swing. Therefore the decrease in potential energy corresponds directly to the increase in kinetic energy if we are ignoring things like friction. So KE = 200-50= 150
What is the change in the internal energy of the gas if 500 cal of heat are added to a gas and the gas expands doing 500J of work?
1. First, you want to convert cal to Joules (cal --> J).To do this, multiply the value of cal by 4.184 (1 cal = 4.184J)500cal x 4.184J = 2092J------------ 1 cal2. Calculate the change in internal energy of the gas (ΔU = heat – work).ΔU = 2092J heat - 500J work= 1595J change in internal energy
What is the power of a cyclist when she overcomes a resistive force of 30N in order to cycle 30m. It takes her 6 seconds to cycle this distance.?
gqya
What is the difference between a Cessna 150 and a Cessna 150J?
Two different versions of the same airplane. There were several earlier versions of the aircraft, each with slight improvements or changes from the original. The 'J' model introduced a key operated electric starter, along with rocker type electrical switches to replace the older style "toggle" switches
If the potential energy of a swing is 200 J at its highest point and 50 J at its lowest point what is the kinetic energy of the swing at its lowest point if mechanical energy is conserved?
150J, as the potential energy has been converted to kinetic energy as the swing accelerates downwards (and forwards) from the top of its swing. Therefore the decrease in potential energy corresponds directly to the increase in kinetic energy if we are ignoring things like friction. So KE = 200-50= 150
What is the output voltage of a defibrillator?
It depends! The older Monophasic (one shock per shock -one way) machines can use as much as 5000V. The newer Biphasic (two shocks per shock -back and forth) machines use around 2200V. Less energy= less heart damage risk. Now to some details: The energy output of these machines is termed in Joules. Usually something like 150J for a Biphasic or 200J in a Mono as a first shock. The critical part is that Joules are a product of the Voltage * Amperage * time (1 sec). Therefore in the above examples : 1500V * 0.1A * 1sec = 150J 2000V * 0.1A * 1 sec= 200J The high voltage is generated by converting either the mains power or the internal battery power to the required voltage via an inverter and then stored in a capacitor for rapid release when needed. As an example, cars usually run on a 12V system, BUT the energy sent to the spark plug from the ignition coil is massive and dangerous for a very short time, as is the energy during defibrillation. So, don't think your gloves will save you. Don't touch the patient when shocking them -as in don't continue compressions when shocking them. There is no such thing as an energy rated safe disposable medical glove. Hope this helps.
Can you replace a Cont 0-200 with a Lycoming 0-235 on a Cessna 150J would there be any problems advantages or disadvantages with this change overall?
the cont 0-200 has a better fuel consumption rate. Check with your IA and he can tell you if that particular combination is an approved installation It is an approved installation; an Airframe and Powerplant shop files a Supplemental Type Certificate, the FAA signs off on it (the O-235 was used in the Cessna 152 so there's no real problem with the conversion) and the mechanic inserts the new engine in your classic airplane. One quick note: Lycoming is not shy about pricing its parts.
What is the change in the internal energy of the gas if 500 cal of heat are added to a gas and the gas expands doing 500J of work?
1. First, you want to convert cal to Joules (cal --> J).To do this, multiply the value of cal by 4.184 (1 cal = 4.184J)500cal x 4.184J = 2092J------------ 1 cal2. Calculate the change in internal energy of the gas (ΔU = heat – work).ΔU = 2092J heat - 500J work= 1595J change in internal energy
