Lab 19: PHYS 4A Lab--Conservation of Energy/Conservation of angular momentum

lab 6- Propagated Uncertainty in Measurements

Propagated Uncertainty in Measurements Purpose Learn how to calculate propagated uncertainty in density measurements with different metal material cylinders. Process First, we need to measure the density of two cylinders made of different materials . To measure the density we should measure its mass m, diameter d and height h. Mass(g) Diameter(cm) Height(cm) 69.4 1.55 5.01 27.6 1.59 4.98 So the density of the first material is about 7.31 g/cm^3, which may be zine. The density of the second material is about 2.80 g/cm^3, which may be aluminum. Then we should calculate the propagated uncertainty of the density. For a cylinder, its density can be calculate with the equation p=(4/∏)* [m/(d2*h)]. The differential form of this equation is dp= (∂p/∂m)*dm + (∂p/∂d)*dd + (∂p/∂h)dh, which equals to The calculation is attached below. Conclusion In this lab, we learnt ho...

lab 11- Work and KE

Purpose: Measure the work done by a non-constant spring which stretches a cart by a measured distance with force sensor, motion detector and Lab Pro. Graph the data collected during stretching and determine the relationship between work done and the kinetic energy, which are equal to each other in theory. The proportion of the force area is exactly the point of kinetic energy at the same time point. EXPT1: work done by a constant force First set up the track, cart , motion detector , force probe and other equipment like the picture shown. Plug force sensor and motion detector and zero them. Adjust the force sensor with a 500-g mass hanging on the string over the pulley. Then remove the mass and add it to the cart. Enter its value as the mass in the data-user parameters menu. Level the track so that the car rolls at a constant speed after a push. Hang 50 grams from the end of the string and then pull the cart back. Hit collect and release the cart. Then we will g...

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