How can precision of a measuring instrument be increased?
One way to do this is to increase the number of calibrated subdivisions (the least
count) that are marked on the measuring instrument or you might choose a better type
of measuring instrument all together. Example: Use a vernier caliper instead of a
meter stick.
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A driver in a 1000 kg car traveling at 20 m/s slams on the brakes and skids to a stop. If the coefficient of friction between the tires and the horizontal road is 0.80, how long will the skid marks be?
A) 26 m B) 21 m C) 33 m D) 24 m
How are the jets produced by radio galaxies similar to those from protostars?
What will be an ideal response?
When the first law of thermodynamics, Q = ?u + W, is applied to an ideal gas that is taken through an isothermal process,
A) ?u = 0. B) W = 0. C) Q = 0. D) ?P = 0.
A free electron and a free proton are released in identical electric fields. Compare the magnitudes of their accelerations
1.It is millions of times greater for the electron. 2.It is thousands of times greater for the electron. 3.They are equal. 4.It is thousands of times smaller for the electron. 5.It is millions of times smaller for the electron.