Basic Physics PHY 114 W-01 Department of Physical and Computer Sciences Medgar E
ID: 3307585 • Letter: B
Question
Basic Physics PHY 114 W-01 Department of Physical and Computer Sciences Medgar Evers College Assignment 9 Name: Write or type work and solutions on a separate paper. If written, write legibly. 1. What is the mass of a 196 N weight? 2. Two forces, one of 50 N due east and the other of 30 N due west are exerted on a box. What is the mass of the box if its acceleration is 4.00 m/s2? 3. A 5.00 kg object placed on a frictionless, horizontal table is connected to a string that passes over a pulley and then is fastened to a hanging 9.00 kg object. Draw free-body diagrams of both objects. Find the acceleration of the two objects and the tension in the string. 4. Extra Credit: A 1.00 kg object is observed to have an acceleration of 10.0 m/s2 in a direction 60.0° east of north. A force exerted on the object has a magnitude of 5.00 N due north. Determine the magnitude and direction of the other force acting on the objectExplanation / Answer
1) Weight = mass* acceleration due to gravity
W = mg
196 = m*9.8
m = 20 kg
2) Net force = 50 - 30 = 20 N east
mass = F/m = 20/4 = 5 kg
3) writig the force equations we have
9g - T = 9a ------(1)
T - 5g = 5a ------(2)
adding both equations we have
4g = 14 a
a = 4*9.8/14 = 2.8 m/s2
T = 5(9.8+2.8) = 63 N