Question

Goal 2 lo introduce you IV The systematic problem-solving techniques CLO2: Use a basic scientific vocabulary that relates to course content: aligns with (Goal 1) (Goal 2) CLO5: Use simple mathematical skills to solve problems which pertain to the physical environment: aligns with (Goal 1)(Goal 2) Unit Objectives: Use Newton's second law to translate a free-body diagram into a mathematical representation. (CLO2)(CLO5) Calculate mass, weight and force (CLO2)(CL05) Calculate the net force acting on objects and their resulting accelerations. (CLO2)(CLO5) Answer the following questions 1. A box of mass 5.0 kg is pulled vertically upwards from rest by a force of 68 N applied to a rope attached to the box. Find a) the acceleration of the box and b) the vertical velocity of the box after 2 seconds. (You need equations from 1-D Motion to do part b) Ma=T-mg sa=68-5*9.8 9= 3.8m/512 Use the due to gravity Use the Law of Gravitatru. due to gravity on the Moon The planet Mars has a mass of 6.42e23 kg surface) of 3.38e6 m. How much would a 60 kg per

Answer 1

) 2268 CA wing п. a) from the gad law: ma=T-mg ताप (5kg) (a) = 68N- (5kg) (9.81 m/5) a = 3.79 m/. acceleration a= 3.8 m/s] since 'a' is constant V=Votat 0+ (3.8m/5) (23) =) :: N = 7.6 m/s / 2) we will use the equ NR = 20 vr to determine the Reynolds number, so we must dete velocity of the oil. since the oil rises to 25m. Vor- egy, where v=0m/s, y = 25 m. Vo = 5299 = 5(2) (9.8 m/5) (25m) = 22.136 m/s Now, we can use the Ear NR=2pr . NR = 2 (900 kg/m) (22.136 m/s) (0.0500m) I(N/m2).5 NR = 1.998 10² 22000 since NR = 2000 is the approximate upper valere for laminar flow so, the flow of oil is laminar (barely).