Weight (lb) 70 170 Weight (N) 0.18 80 Height of single step (m) Number of steps climbed Total height climbed (m) 42 19 Time to walk stairs (s) Time to run stairs (s) Walking Running Work (J) Power (W) Power (hp)

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Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
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Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Data Sheet
Weight (lb)
170
Weight (N)
0.18
80
Height of single step (m)
Number of steps climbed
Total height climbed (m)
42
19
Time to walk stairs (s)
Time to run stairs (s)
Walking
Running
Work (J)
Power (W)
Power (hp)
a
近
Transcribed Image Text:I Inbox (29)- kriver1... Data Sheet Weight (lb) 170 Weight (N) 0.18 80 Height of single step (m) Number of steps climbed Total height climbed (m) 42 19 Time to walk stairs (s) Time to run stairs (s) Walking Running Work (J) Power (W) Power (hp) a 近
66/View
M Recibidos (1,308) -.
M Inbox (29) - kriver1...
OCengageBrain - Log...
Webex Mat 272
Citri
Objective
W
(2)
In this experiment you will calculate the power you
develop when climbing a flight of stairs.
The SI unit of power is a watt (W), which is equivalent
to a J/s.
Apparatus
When James Watt invented his steam engine, he was
asked how many horses the engine could replace. To
find out, he built a rope-and-pulley device with which
he could measure the time it took a horse to lift var-
ious weights.
Stairs, Stopwatch, Meter stick.
Theory
Consider the (rather crude) person climbing a flight Watt defined horsepower as the power a horse can
produce steadily for a sustained period of time. The
SI equivalent of one horsepower is 746W.
of stairs as shown below.
Procedure
1. Record your weight in lb on the Data Sheet; ap-
proximate if you do not know. Convert this to
N.
2. Take a stopwatch and meter stick and locate
Some stairs that can be used for the experiment.
You want to climb at least 2m vertically, so this
Tmight be more than one section of stairs if the
staircase turTIs as it. rises.
Work W is defined as the product of a force F and
distance d; specifically the component of the force in
the direction of the movement.
3. Mcasure the height of one step and count the
total number of steps you will be climbing.
Record these values and calculate the total
tical height.
W = Fd
For the person climbing the stairs the force they are
moving is their own weight w. This force acts straight
down, so in climbing a vertical height y the work done
4. Tine how long it takes vou to walk up the stairs,
repeat for running (safely) up the stairs.
is
5. Calculate the work done both in walking and run-
ning the stains with Equation 1. Calculate the
power in cach case with Equialion 2. Convert the
power in W Lo hp.
(1)
hm = M
The SI unit of work is a joule (J), which is equivalent
to a Nm.
Power is the rate at which work is done If it takes
the person time t to climb then the power P is
Transcribed Image Text:66/View M Recibidos (1,308) -. M Inbox (29) - kriver1... OCengageBrain - Log... Webex Mat 272 Citri Objective W (2) In this experiment you will calculate the power you develop when climbing a flight of stairs. The SI unit of power is a watt (W), which is equivalent to a J/s. Apparatus When James Watt invented his steam engine, he was asked how many horses the engine could replace. To find out, he built a rope-and-pulley device with which he could measure the time it took a horse to lift var- ious weights. Stairs, Stopwatch, Meter stick. Theory Consider the (rather crude) person climbing a flight Watt defined horsepower as the power a horse can produce steadily for a sustained period of time. The SI equivalent of one horsepower is 746W. of stairs as shown below. Procedure 1. Record your weight in lb on the Data Sheet; ap- proximate if you do not know. Convert this to N. 2. Take a stopwatch and meter stick and locate Some stairs that can be used for the experiment. You want to climb at least 2m vertically, so this Tmight be more than one section of stairs if the staircase turTIs as it. rises. Work W is defined as the product of a force F and distance d; specifically the component of the force in the direction of the movement. 3. Mcasure the height of one step and count the total number of steps you will be climbing. Record these values and calculate the total tical height. W = Fd For the person climbing the stairs the force they are moving is their own weight w. This force acts straight down, so in climbing a vertical height y the work done 4. Tine how long it takes vou to walk up the stairs, repeat for running (safely) up the stairs. is 5. Calculate the work done both in walking and run- ning the stains with Equation 1. Calculate the power in cach case with Equialion 2. Convert the power in W Lo hp. (1) hm = M The SI unit of work is a joule (J), which is equivalent to a Nm. Power is the rate at which work is done If it takes the person time t to climb then the power P is
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