(6%) problem 11: a small block of mass m = 850 g is placed on top of a larger block of mass 3m which is placed on a level frictionless surface and is attached to a horizontal spring of spring constant k = 4.1 n/m. the coefficient of static friction between the blocks is μ = 0.2. the lower block is pulled until the attached spring is stretched a distance d = 3.5 cm and released.

Given the position vector of the particle r(t)=(t+1)i+(t^2−1)j+2t k, find the particle's velocity and acceleration vectors at t=1

An automobile steering wheel is shown. what is the ideal mechanical advantage? if the ama is 8, what is the efficiency of the steering wheel?

1. a camcorder has a power rating of 19 watts. if the output voltage from its battery is 7 volts, what current does it use?answer units 2. a 1.5m wire carries a 6 a current when a potential difference of 57 v is applied. what is the resistance of the wire? yourunits 3. a clothes dryer uses about 2 amps of current from a 240 volt line. how much power does it use? yourunits 4.