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course phys201
Questions related to q_a_1.If we were to multiply the unit cm / sec by the unit sec / hr what unit would we get?
Cm/s* s/hr = Cm/hr
2. If we were to divide the unit cm by the unit cm / sec what unit would we get?
Multiply by the reciprocal cm/1 *sec/cm = seconds
3. In this qa we began with the definition of average velocity. We have seen that this definition is consistent with our idea of speed as distance traveled divided by time required. However our definition of velocity can produce a negative result, which was not the case for speed. The negative result will, for example, occur when the change in position is negative while the change in clock time is positive.
• How is it that the change in position can be negative?
Moving opposite froma starting point
4. Having defined average velocity, we used symbols to stand for the initial and final positions and clock times. What expression did this give us for the average velocity?
Delta V/delta t
5. Having defined average velocity, we then represented a pair of initial and final positions and clock times on a graph of position vs. clock time. What did we learn about the graph?
By knowing the average velocity, we can find both final velocity and avg time
6. What are some possible units for position? What are some possible units for clock time? What therefore are some possible units for rate of change of position with respect to clock time?
Degrees, ft, miles and for clocktime: sec, minutes, hrs
Ex. Deg/s, ft/min, miles/hr
Questions related to text
1. What is 3.2 km + 340 meters, to the correct number of significant figures?
3.5
2. Find 1.80 m + 142.5 cm + 5.34 * 10^5 micro m, to the correct number of significant figures. You should know that 'micro' indicates multiplication by 10^-6, so a micro m is 10^-6 meter.
1.80m + 1.425m x (5.34x10^-5 ) 10^-6 = 3.80
3. Find 3.84 kilograms - 3842 grams, to the appropriate number of significant figures.
Answer = 0
Because when converting grams to kilograms you finish with 3.842, however when using 3 sig fig, the 2 dosen’t matter
Questions related to key systems
1. Pendulums of lengths 20 cm and 25 cm are counted for one minute. The counts are respectively 69 and 61. To how many significant figures do we know the difference between these counts?
20/69 25/61 know 1 significant figure
Questions/problems for University Physics Students
1. Find the x and y components of two displacements, one of 4.0 meters at 60 degrees and the other of 3.0 meters at 135 degrees. Both angles are measured in the counterclockwise direction from the positive x axis.
2. If you drive 2.6 km north, then 4 km east before turning 45 deg to your left and traveling an addition 3.1 km, then what is the magnitude and direction of your displacement from the original position to the final position? Sketch a figure depicting this motion, describe the figure and describe how it appears to support your result.
3. What do you think is the uncertainty in the magnitude of a vector whose components are given as 0.7 cm in the x direction and 5.932 cm in the y direction? What do you think is the uncertainty in its direction?
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