PSYC 221 : Review Final Oldmaterial 1
15 Mar 2019
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Section 3. 6: a mass of 40 kg stretches a spring 80 cm (or 0. 8 meters). What is the spring constant? (see page 254. ) The spring constant always has units of force per unit length. Here it is assumed that gravity is pulling down on the mass. 392. 4 n = 40 kg 9. 81 m s2 , where n denotes newtons. N m: the spring constant is k = 784 n/m. How far will a mass of 20 kg stretch the spring under. If s is the spring stretch, then the force f acting on the spring is given by. The gravitational force acting on the mass is given by f = 20 9. 81 = 196. 2 n. solving for s, we have. 784 n/m: a dashpot exerts a damping force of 40 newtons when the velocity is 30 centimeters per second. What is the damping constant. (see page 254. ) The damping constant always has units of force per unit velocity.
