While roller skating, jack and jill decide to test one of newton's laws. they stood facing each other. jack pushed on jill's hand and jill pushed on jack's hand with equal force. what law were they testing and what happened next?

group of answer choices

jack and jill were testing newton's 3rd law. jill moved backwards but jack moved forward.

jack and jill were testing newton's 1st law of motion because they had balanced forces action on each other and no movement took place.

jack and jill were testing newton's 2nd law of motion because they experienced an equal but opposite acceleration.

jack and jill were testing newton's 3rd law of motion. jack and jill pushed on each other (action) and then they both moved away from each other (reaction).

Wavelength,frequency,and energy are related.what happens to a wave as it’s wavelength gets shorter?

The frequency of vibrations of a vibrating violin string is given by f = 1 2l t ρ where l is the length of the string, t is its tension, and ρ is its linear density.† (a) find the rate of change of the frequency with respect to the following. (i) the length (when t and ρ are constant) (ii) the tension (when l and ρ are constant) (iii) the linear density (when l and t are constant) (b) the pitch of a note (how high or low the note sounds) is determined by the frequency f. (the higher the frequency, the higher the pitch.) use the signs of the derivatives in part (a) to determine what happens to the pitch of a note for the following. (i) when the effective length of a string is decreased by placing a finger on the string so a shorter portion of the string vibrates df dl 0 and l is ⇒ f is ⇒ (ii) when the tension is increased by turning a tuning peg df dt 0 and t is ⇒ f is ⇒ (iii) when the linear density is increased by switching to another string df dρ 0 and ρ is ⇒ f is ⇒

Abatter hits a 0.140-kg baseball that was approaching him at 30 m/s and, as a result, the ball leaves the bat at 40 m/s in the reverse of its original direction. the ball remains in contact with the bat for 2.0 ms. what is the magnitude of the average force exerted by the bat on the ball?