Two waves are superposed. one wave has an amplitude of 3 cm, and the other has an amplitude of 4 cm. what is the resultant amplitude?

When a 5.0kg cart undergoes a 2.2m/s increase in speed, what is the impulse of the cart

If the wheels lock when braking suddenly the vehicle: a: loses traction b: lose steering wheel ability c: gain speed slightly d: gain steering ability

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.