You hold a cord/rope with length l, mass m and density p in such a way that it just touches a scale/balance (don't forget that l = mp). then, you release the rope. calculate the weight that you can read on the display of the balance when the last piece of the cord/rope touches it.

If 21.2 kcals of energy is released by this reaction, how many kj does the reaction release? (1 cal 4.184 j)

The 10-kg double wheel with radius of gyration of 125mm about o is connected to the spring of stiffness k = 600 n/m by a cord which is wrapped securely around the inner hub. if the wheel is released from rest on the incline with the spring stretched 225 mm, calculate the maximum velocity v of its center o during the ensuing motion. the wheel rolls without slipping

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?