How can mechanical waves in the treatment of cancer?

ultrasound is used to improve absorption of a radioactive pellet by a tumor.
the radioisotope in a radiopharmaceutical releases sound waves into surrounding cells.
beams of x-rays are targeted at a cancerous tumor from outside the body.
cells absorb chemotherapy drugs more easily after being treated with ultrasound.

Julia would be observing a. static electricity was caused by her sweater rubbing against her shirt and transferring electrons. she didn't touch anything metal, so that would cancel out b.she most likely didn't rub her sweater against her hair either, so that cancels out c.she also didn't scoot across the carpet while trying to take her sweater off, that cancels out d.so that leaves a.a. is correct.

0 = 0.40 / 0 = 0

= 0.20 = 9.80 ⁄2 =?

=0 , = = 0.20 =0.50 0 0.40 ⁄

=0−122 =0−12(9.80 ⁄2)(0.50)2 =1.2