Zirconium tungstate is an unusual material because its volume shrinks with an increase in temperature for the temperature range 0.3 k to 1050 k (where it decomposes). in fact, the volumetric coefficient of thermal expansion is –26.4 × 10–6/k. determine the ratio δv/v0 for the above mentioned temperature range. express your answer in percent.
an ldr's resistance changes with light intensity, while a thermistor's resistancce changes with temperature.
in dark, ldr's resistance is large and in the day/light ldr's resistance is small.
at low temperature, thermistor's resistance is large, while at large temperature it resistance is small.
in an ldr resistance increases as light intensity falls, while in a thermistor resistance falls as temperature falls.
1). use the definition 1 horsepower = 746 watts
100 watts = (100/746) hp = 0.134 horsepower
2). use the definition power = (work done) / (time to do the work)
and the definition work = (force) x (distance moved)
(3,000 n x 5 m) / second
= (3,000 x 5 n-m) / second
= (15,000 joules) / second
= 15,000 watts
3). use the definition power = (work done) / (time to do the work) , and the definition work = (force) x (distance moved) , and the 'customary' definition of 1 horsepower = 550 foot-pounds per second.
let the answer the number of gallons be called ' g ' until we know what it actually is.
weight of water lifted in 1 minute = (g gallons) x (8.34 pounds/gallon)
the distance it's lifted = 30 feet
work done in 1 minute = (force x distance) = (8.34g x 30) foot-pounds
in just a moment, we're going to need this in seconds:
power = (8.34g x 30 foot-pounds/minute) x (1 minute / 60 seconds)
power = (8.34g x 30/60) (foot-pound-minute/minute-sec)
power = 4.17g foot-pound/sec
the power = 1/2 horsepower = 225 foot-pounds / sec
so finally, 225 = 4.17g
divide each side by 4.17, and we have
g = (225/4.17) gallons
g = 53.96 gallons
i really should check this over, but i've had it up to here with gallons, feet, horsepower, and pounds, so i'm not gonna do it. read my lips. it is what it is. i stand or fall by my answer. what could go wrong ? !