A 2.85 kg block on a horizontal floor is attached to a horizontal spring that is initially compressed 0.0330 m . The spring has force constant 870 N/m . The coefficient of kinetic friction between the floor and the block is 0.35 . The block and spring are released from rest and the block slides along the floor. A-What is the speed of the block when it has moved a distance of 0.0120m from its initial position?

One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. you see that the patch of light seems to be a circular diffraction pattern. it appears that the central maximum is about 1 cm across and you estimate that the distance from the window shade to the wall is about 3 m. what is (a) the average wavelength of sunlight? (b) the diameter of the pinhole?

Look at the potential energy diagram for a chemical reaction. which statement correctly describes the energy changes that occur in the forward reaction?

An inclined plane wrapped around a metal shaft is a a. lever b. screw c. pulley d. wedge