Acompact car, mass 660 kg, is moving at 1.00 ✕ 102 km/h toward the east. the driver of the compact car suddenly applies the brakes hard for 2.1 s. as a result, an average force of 4.8 ✕ 103 n is exerted on the car to slow it down. (a) what is the change in momentum, that is the magnitude and direction of the impulse on the car?

Do you agree with scientist’s prediction about the warming of alaska and other polar regions?

In a stagnant pool of water, a crayfish may spend much of its time lying with one side of its carapace near the surface of the water. in this position, it will move the walking legs on that side in a rhythmic back-and-forth motion. explain the likely function of this behavior.

Consider a uniformly charged ring in the xy plane, centered at the origin. the ring has radius a and positive charge qdistributed evenly along its circumference. a)what is the direction of the electric field at any point on the z axis? . b)what is the magnitude of the electric field along the positive z axis? use k in your answer, where k=14πϵ0. d)the ball will oscillate along the z axis between z=d and z=−d in simple harmonic motion. what will be the angular frequency ω of these oscillations? use the approximation d≪a to simplify your calculation; that is, assume that d2+a2≈a2. express your answer in terms of given charges, dimensions, and constants