How does the number of coils (length of wire) affect the strength of the magnet (amount of paper clips picked up)?

In the first law of thermodynamics, triangle e=q-w, what does q stand for

As microwave light travels through a liquid, it moves at a speed of 2.2 x 108 m/s. if the frequency of this light wave is 1.1 x 108 hz, what is the wavelength of this microwave?

Determine the largest intensity w of the uniform loading that can be applied to the frame without causing either the average normal stress or the average shear stress at section b–b to exceed σ=19 mpa and τ=24 mpa, respectively.