A horizontal force is applied to a 6 kg cart across a 2 m level surface, accelerating it from an initial speed of 0 m/s to a final speed of 2 m/s. Using the work-kinetic energy theorem, find the force. F d = ½ m ( vf2 - vi2 )

At 20∘c, the hole in an aluminum ring is 2.800 cm in diameter. you need to slip this ring over a steel shaft that has a room-temperature diameter of 2.804 cm . 1. to what common temperature should the ring and the shaft be heated so that the ring will just fit onto the shaft? coefficients of linear thermal expansion of steel and aluminum are 12×10−6 k−1 and23×10−6 k−1 respectively.

Does the distance travelled by an oscillating mass between times t=0 and t2 equal the displacement of the particle over the same time period if t2> t/2? hint: consider a sine wave starting at t1=0, then consider a closing wave starting at t1=0, for your explanation.

3. which is not a primary color of light? blue red green yellow