Aspring 20cm long is stretched to 25cm by a load of 50n. what will be its length when stretched by 100n assuming that the elastic limit is not reached? i want the answer abd solving to this question and also the formula for young modulus of elasticity

Starting with only the balmer series light (visible light), how could we ensure that the solar panels generate a current that mark can use for his power station? a)by gradually increasing the brightness (amount) of light that we shine on it. b)by gradually increasing the frequency of the light we shine on it. c)by gradually increasing the wavelength of the light that we shine on it.

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects