Help a girl out !!! Im struggling

Which type of energy would have nothing to do with ironing clothes? a. heat b. chemical c. electrical d. mechanical

Describe how the motion of a spring being pushed forward and backward is similar to the motion of air particles in a sound wave.

Check the following equation for dimensional homogeneity: ⅆ mv=∫t1t2(f⁢cosθ)ⅆt where m is mass, v is velocity, f is force, θ is an angle, and t is time. check that each term in the equation has the following dimensions: [malbec] where you are to choose the coefficients a, b, c.