The work done to a machine is input work
true or false

True

Explanation:

The work done to a machine is input work is a "true statement" the work done to a machine is input work. Input work is energy, power or even work put into creating/changing/programming a device which can be any machine so the machine carries out what it has been created to complete.

Hope this helps.

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