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physics
march 2020
05

Physics Questions and Answers March 05, 2020

Expert-verified solutions to help you succeed

Figure 1 shows an acceleration-versus-force graph for three objects pulled by rubber bands. The mass of object 2 is 0.40kg. A) What is the mass of object 1? B) What is the mass of object 3?

The Hubble constant in general is not a constant in time. You will derive its time evolution here. (a) Show that the curvature parameter k in the Friedmann equation can be written in terms of the presentday Ho and 2o as k H3 (No 1). (b) Using (a) and the Friedmann equation, show that the Hubble parameter is a function of the scale (1) factor a

Establish which combinations of indices are allowed and which are forbidden in the space group symmetry Cmc21. List symmetry elements that cause each group of reflections to become extinct?

A charge of -2.460 CC is located at (2.775 mm , 4.760 mm ), and a charge of 1.540 CC is located at (-2.702 mm , 0). a. Find the electric potential at the origin. b. There is one point on the line connecting these two charges where the potential is zero. Find this point.

Are all periodic motions simple harmonic? Explain and give an example of a periodic motion that is not simple harmonic.

a. What is a simple pendulum? b. If you were to suspend a baseball bat from one end and let it swing back and forth, does it make a simple pendulum? c. Under what conditions does an oscillating mass tied to a string constitute a simple pendulum?

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