How to calculate this two questions. please help me​

if you already have the answer to (a), then just work out how many periods there are in 1 minute, and that's the answer to (c).

electrical power

the small 0.38-kg slider is known to move from position a to position b along the vertical-plane slot. determine (a) the work done on the body by its weight and (b) the work done on the body by the spring. the distance r = 0.70 m, the spring modulus k = 154 n/m, and the unstretched length of the spring is 0.53 m

explanation:

-reverse card

so easy. just google the electromagnetic waves and it’ll pop up.