course phy 201 Origionally submitted Sunday afternoon, this is a resubmit (1004 am on Wednesday, Sept 30) If your solution to stated problem does not match the given solution, you should self-critique per instructions at
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Given Solution: 30 cm/s has units of cm / s, which are units of displacement divided by units of time. Thus 30 cm/s has units of velocity. So 30 cm/s it could be any of the quantities 2, 5, 7, or 11 (velocity, average velocity, rate of change of position with respect to clock time (which is the definition of average velocity), or change in velocity). 50 s has units of s, or seconds, which are units of time. So 50 s can possibly represent any of the quantities 4, 8 or 12 (a clock time, a time interval, or a change in clock time). 90 cm/s^2 has units of distance divided by squared units of time. Thus 90 cm/s^2 has units of acceleration. So 90 cm/s^2 could be any of the quantities 3, 6 of 10 (acceleration, average acceleration, or rate of change of velocity with respect to clock time (which is the definition of average acceleration). 40 cm * s has units of distance multiplied by units of time. None of the important kinematic quantities (i.e., the quantities associated with the definitions of average velocity and average acceleration) have units of cm * s, and none of the quantities in the list have these units. So the answer here is 'none of the above'. &&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&& Self-critique (if necessary): not necessary ------------------------------------------------ Self-critique rating: not necessary ********************************************* Question: `q002. The following is a list of terms used in the analysis of uniformly accelerated motion. Time interval Velocity Rate of change of velocity with respect to clock time Average acceleration Average velocity Clock time Rate of change of position with respect to clock time Change in clock time Change in position Acceleration Change in velocity Position Below are listed four quantities that might be observed or calculated in an experiment: 20 km / year^2 30 miles 42 nanometers / picosecond 15 cm^2 / s Identify each of these quantities by listing each, followed by the terms that might apply to each, and your justification for each set of answers: YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY Your solution: 20 km/year^2 involves the change in position divided by the change in clock time, which is velocity, and then dividing that quantity again by the clock time. Making a long story short it is the change in velocity with respect to clock time. This is the definition of acceleration. Knowing this we can determine that this quantity can represent options 3,4 and 10 (rate of change of velocity with respect to clock time, average acceleration and acceleration) 30 miles has the unit of miles, which is used to measure distances. Knowing this we can determine that this quantity could represent options 9 or 12 (change in position or position) 42 nanometers/ picosecond has units that represent the change of position with respect to clock time which is the definition of velocity. Knowing this we can determine that this quantity could represent options 2,5,7 or 11 (velocity, average velocity, rate of change of position with respect to clock time, or change in velocity.) 15 cm^2/ s dose not have units that match any of the given choices. So this quantity represents none of the above confidence rating: very confident ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Given Solution: 20 km / year^2 has units of distance (km) divided by squared units of time (year^2), so it has units of acceleration. It could therefore represent any of the quantities 3 (rate of change of velocity with respect to clock time, which is the definition of average acceleration), 4 (average acceleration) or 10 (acceleration). 30 miles has units of miles, which is a measure of distance or displacement. It could therefore represent either of the quantities 9 (change in position) or 12 (position). 42 nanometers / picosecond has units of distance (nanometers) divided by units of time (picoseconds), which give it units of velocity. It can therefore represent any of the quantities 2 (velocity), 5 (average velocity), 7 (rate of change of position with respect to clock time, which is the definition of average velocity) or 11 (change in velocity). 15 cm^2 / s has units of squared distance (cm^2) divided by units of time (s). None of the quantities associated with the definitions of average velocity or average acceleration has units of squared distance divided by time, so this quantity is not associated with the analysis of motion. The correct answer would be 'none of the above'. &&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&& Self-critique (if necessary): not necessary ------------------------------------------------ Self-critique rating: not necessary ********************************************* Question: `q003. The following is a list of terms used in the analysis of uniformly accelerated motion. Initial velocity on an interval Final velocity on an interval Average velocity on an interval Change in velocity on an interval Average acceleration on an interval Change in position on an interval Change in clock time on an interval Displacement on an interval Below are listed four quantities that might be observed or calculated in an experiment: 20 m / s^2 40 s 35 cm / s 70 cm Identify each of these quantities by listing each, followed by the terms that might apply to each, and your justification for each set of answers: YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY Your solution: 20 cm/s^2 has units that are consistant with the units used when measuring acceleration. So this makes it clear that this particular quantitiy could represent the average acceleration on the interval (option 5) 40 s has the unit of seconds that is used to measure clock time. This leads one to believe that this quantity could represent the change in clock time on the intercal (option 7) 35 cm/s has the unit if cm/s which is used for velocity measurements this means that this quantity could represent the change in velocity on the interval (option 4), the average velocity on the inteval (option 3), the final velocity on the interval (option 2) or the initial velocity on the interval (option 1) 70 cm has the unit of cm which is used to measure distance or position of an object. So this quantity could represent the displacement on the interval (option 8) or the change in position on the interval (option 6). confidence rating: very confident ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Given Solution: 20 m/s^2 has units of distance (m) divided by squared units of time (s^2), so it has units of acceleration. It could therefore represent quantity 5 (average acceleration on an interval). 40 s has units of s, or seconds, which are units of time. So 50 s can possibly represent any of the quantities 4, 8 or 12 (a clock time, a time interval, or a change in clock time). 35 cm/s has units of distance (cm) divided by units of time (s), which give it units of velocity. It can therefore represent any of the quantities 1 (initial velocity on an interval), 2 (final velocity on an interval), 3 (average velocity in an interval), or 4 (change in velocity in an interval). 70 cm has units of cm, which is a measure of distance or displacement. It could therefore represent the quantity 6 (change in position on an interval) or the quantity 8 (displacement on an interval, which is defined as the change in position on the interval). &&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&& Self-critique (if necessary): not necessary ------------------------------------------------ Self-critique rating: not necessary ********************************************* Question: `q004. The following is a list of terms used in the analysis of uniformly accelerated motion. Change in clock time on an interval Initial velocity on an interval Change in position on an interval Average velocity on an interval Displacement on an interval Average acceleration on an interval Final velocity on an interval Change in velocity on an interval Below are listed four quantities that might be observed or calculated in an experiment: 20 m / s 40 cm 35 cm / s^2 70 s Identify each of these quantities by listing each, followed by the terms that might apply to each, and your justification for each set of answers: YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY Your solution: 20 m/s has units that are used in measuring velocity. This means that this quanity could represent the initial velocity on the interval (option 2), the average velocity on the interval (option 4), the final velocity on the interval (option 7) or the change in velocity on the intercval (option 8) 40 cm has the unit cm which is used to measure position or distance. So this quantity could represent the change in position on the time interval (option 3) or the displacement on an interval (option 5) 35 cm/s^2 has the unit cm/s^2 which is used when talking about acceleration. So this quantity could represent the average acceleration on the interval (option 6) 70 s has the unit of seconds which is used to measure clock time. So this quantity could represent the change in clock time on the interval (option 1). confidence rating: very confident ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Given Solution: 35 cm/s^2 has units of distance (cm) divided by squared units of time (s^2), so it has units of acceleration. It could therefore represent quantity 6 (average acceleration on an interval). 70 s has units of s, or seconds, which are units of time. So 50 s can possibly represent any of the quantities 4, 8 or 12 (a clock time, a time interval, or a change in clock time). 20 m/s has units of distance (m) divided by units of time (s), which give it units of velocity. It can therefore represent any of the quantities 2 (initial velocity on an interval), 7 (final velocity on an interval), 4 (average velocity in an interval), or 8 (change in velocity in an interval). 40 cm has units of cm, which is a measure of distance or displacement. It could therefore represent the quantity 3 (change in position on an interval) or the quantity 5 (displacement on an interval, which is defined as the change in position on the interval). &&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&& Self-critique (if necessary):not necessary ------------------------------------------------ Self-critique rating: not necessary "