How is the musician shown changing the instrument to play different musical notes?

a.)changing the velocity of the sound wave

b.)changing the resonant frequency of the standing wave

c.) changing the amplitude of the sound wave

d.$ changing the length of the air column

Assume you measured the mass of the cart to be (500 ± 1) g and the mass of the additional mass you put on the cart to be (500 ± 1) g as well. since the scale you are using in the lab cannot measure objects heavier than 600g you will have to sum up individual pieces and propagate the error. so what would be the mass and the standard error of the cart and the mass

Ascientific blank must be testable and capable of being proven false?

Sort the images based on whether there's a force of attraction or repulsion between the magnets shown. attraction repulsion