1. A car advertisement states that a certain car can accelerate from rest to 90km/h in 9 seconds. What is the car's average acceleration?

2.An eagle accelerates from 15m/s to 22m/s in 4 seconds. What is the eagle's average
acceleration?

3.At the starting line, a sprinter is traveling at 0 m/s before being told to go. Nine seconds
later, she is moving at 10 m/s. What is her acceleration?

4.A person sees a red light and applies his brakes. The speed of his car decreases from 100
km/hr to 0 km/hr in 2 seconds. What is his acceleration?

Consider a double atwood machine constructed as follows: a mass 4m is suspended from a string that passes over a massless pulley on frictionless bearings. the other end of this string supports a second similar pulley, over which passes a second string supporting a mass of 3m at one end and m at the other. using two suitable generalized coordinates, set up the lagrangian and use the lagrange equations to find the acceleration of the mass 4m when the system is released. explain why the top pulley rotates even though it carries equal weights on each side.

Along wire carrying a 4.2 a current perpendicular to the xy-plane intersects the x-axis at x=−1.7cm. a second, parallel wire carrying a 3.0 a current intersects the x-axis at x=+1.7cm. part a at what point on the x-axis is the magnetic field zero if the two currents are in the same direction? express your answer to two significant figures and include the appropriate units.

Which are causes of mechanical weathering? (check all that apply) a. acid rain b. plant growth c. animal actions d. carbon dioxide e. pressure release i chose b & e and got the question wrong.