Why is the HP 15C so expensive? - Physics Forums
2012年2月17日 · The HP 15C calculator is considered a high-end scientific calculator with advanced features, such as complex number calculations and programmability. It also has a durable build and a long battery life, making it a popular choice among professionals and …
Hp-15c Gone, but not forgotten - Physics Forums
2010年2月18日 · The "Hp-15c Gone, but not forgotten" refers to the Hewlett-Packard (HP) 15c calculator, which was a popular scientific calculator produced by HP from 1982 to 1989. It is no longer in production, but it remains a beloved and highly sought-after calculator among mathematicians, engineers, and scientists.
Which calculator? Hp 50G vs Ti89 Titanium - Physics Forums
2006年9月23日 · I remember not being able to financially justify trading up to an HP 15C, since my 29C did everything I needed, but I really liked the 15C. It's financial cousin, the HP 12C is still quite commonly seen in banks, real estate offices, investment counselors' offices, etc.
How much power does my car actually need to maintain speed?
2015年3月15日 · Assuming my car weighs 4000 pounds with passengers and cargo and is traveling at 100 feet per second, this requires 4000lb*100ft/s = 400,000 ft-lb/s or 727.3 hp of work. But I know the engine is only producing about 50 or 60 hp, and I'm maintaining speed!
Solving Engineering Calculations with HP Prime - Hemi79 - Physics …
2015年4月27日 · FAQ: Solving Engineering Calculations with HP Prime - Hemi79 What is the HP Prime calculator and how does it help with engineering calculations? The HP Prime is a powerful graphing calculator designed specifically for engineers and scientists.
Calculating required horsepower - Physics Forums
2019年9月15日 · Horsepower is typically expressed in units of horsepower (hp) or kilowatts (kW). One horsepower is equal to 0.7457 kilowatts. How does the speed of the object being moved affect the required horsepower? The speed of the object being moved can affect the required horsepower in two ways.
TI Nspire CX CAS vs HP Prime vs Casio FX-CP400 - Physics Forums
2015年4月11日 · The Hp Prime copied this philosophy as well as built their Prime upon the earlier Hp 49/40G platform. This makes it a somewhat less powerful number crunching tool than the earlier Hp 50G unless you use the Hp 50G in algebraic mode, then the Hp Prime is probably better (this is due to the fact that the Hp 50G is an RPN calculator by nature that ...
Force needed to rotate a drum/cylinder - Physics Forums
2007年11月28日 · How do I calculate the HP (torque) needed to rotate a large cylinder mounted on bearings? The cylinder in question is a 8 foot long 12" diameter piece of pipe weighing a couple of hundred pounds, mounted on two end stubs with bearings. Its the business end of a large flail mower and this...
Supercharger power requirement - Physics Forums
2010年4月14日 · Just take the example on this thread. It requires 24,6 hp from your engine to compress the air with 100 % efficiency. Doing it with a blower (55% eff) means 44.7 hp. Doing it with a screw compressor (72% eff) means 34.2 hp. That is a 10 hp gain just by selecting the proper compressor.
Calculating the required motor size to move a load. - Physics Forums
2013年5月14日 · Continuing, 26 watts is about 26/760 = 0.034 hp. at 80% efficiency, you would need a .043 hp motor. Now you will have to figure out the rpm of the motor and the desired gear ratio to reduce the speed.