A box of mass 400 kg is supported on a spring scale on the floor of a goods Ilft. The is 1900 kg. The lift is travelling from the 20th floor to the ground floor. At an instant when the deceleration of the lift is 1.2 ms as it approaches the ground floor, what is the readi oolo?

A steel cable whose cross-sectional area is 2.5 cm2 supports a 1000-kg elevator. The elastic limit of the cable is 3 x108 Pa. What is the maximum upward acceleration that can be given the elevator if the tension in the cable is to be no more than 20% of the elastic limit? a. т b. If the acceleration of the elevator upward is 6 what is the tension force in the cable?

A wheel with rotational inertia 48 kg.m2 is mounted on a fixed, frictionless axle. The angular speed of the wheel is increased from zero to 59 rad/s in 12-s. What is the average net torque/Moment in N.m on the wheel during this time interval?

Q3. As shown on the right in image below, the force Facting on the box varies with displacement s, and the coefficient in the image, C = 14. Determine the work done by force Fto the box when the box has displaced s = 1.9 m. Please pay attention: the numbers may change since they are randomized. Negative sign must be included if the work done is negative. Your answer must include 2 places after the decimal point, and proper SI unit. F (N) F 5 3 S 4 C s (m) 1 2