If a thermometer indicates a temperature of 86°F, what's the equivalent temperature in the Celsius scale? What's the temperature –15°F in degrees Celsius?
What's the temperature of 10°C in degrees Fahrenheit?
What's the temperature –20°C in degrees Fahrenheit?
What's the temperature –10°C in kelvins?
What's the temperature 414 K in degrees Celsius?
What's the value of 3,993 Btus in joules?
What's the value of 96,745 joules in Btus

1. -26

2. 50

3. -4

4. 263.15

5. 140.85

6. 4212838

7. 91.696567

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally