AP PHYSICS C. FA AP PHYSICS C: IF THIS ISN'T MAKING SENSE YEAH, IT DOESN'T MAKE IT FORCES... A 12 kg box sits on a frictionless ramp with a 20 incline. A child pulls on a rope attached to the box, trying to pull it up the ramp. If the rope makes an angle of 68 with the horizontal, what is the minimum force F the child must exert to move the box up the ramp? 680 BOX 200 2. A box is held in position on a frictionless incline by a cable as shown below. (a) Determine the tension in the cable as a function of m, 0, and other fundamental constants. (b) Show that your result is plausible for the special cases of 0 = 0 and 0 - 90. DAT soni at thod adacid owl m bold no, I look To sumet onT (d) 3. A 52 kg student weighs himself by standing on a force scale mounted on a skateboard that is rolling down a 20 incline. A picture is attempted below... What is the reading on the bathroom scale? .woled awnde en go oor SCALE 200 edr ()amin 4. A block of mass m slides with speed v. across a frictionless floor and comes to a frictionless ramp inclined at angle 0. The block slides to some maximum height h above the floor before coming to a momentary stop. Show that h is independent of m and 0 by deriving an expression for h in terms of v. and g. Vo mthe bucket is WY ILVILA S.LVV ONINHOM BILL 3IN noA paysansun pur meu18 2, nox d Suoge uogsod yi yall sseur jo gary A 4 kg block hangs from a spring scale attached to the ceiling of an elevator, as shown below. What does the scale read when; (a) The elevator is descending at a constant speed of 15 m/s? (b) The elevator is ascending at a constant speed of 15 m/s? (c) The elevator is descending at 15 m/s and gaining speed at 3 m/s?? (d) Suppose the elevator ascends at a constant speed of 10 m/s from t = 0 to t - 6 s, then the speed is steadily reduced to zero from t = 6 s to t - 10 s. What does the scale read for 0