Part A: A car moves with an initial velocity of 28 m/s due north. Find the velocity of the car after 6.7 s if it’s acceleration is 1.4 m/s2 due north. Part b: find the velocity of the car after 6.7 s if it’s acceleration is 1.5 m/s2 due south.

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.

If y gets smaller as x gets bigger and y have an relationship?

Asled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slidesa distance d1 down the slope and then covers the distance d2 alongthe horizontal terrain before stopping. find the coefficient ofkinetic friction μk between the sled and the ground, assumingthat it is constant throughout the trip. find the coefficient of kinetic frictionμk. express your answer in terms of someor all of the variables d1, d2, and θ.