3.7.3.3. Exercise: Looping using for and range 3#
Someone pushes a carriage using a dynamometer as shown in Fig. 3.8. The push force is measured in newtons every tenth of a second, during five seconds.
Fig. 3.8 Pushing a carriage using a dynamometer.#
push_force = [
91.19, 99.22, 93.11, 91.76, 94.93, 96.54, 92.27, 96.01, 92.48,
94.89, 91.55, 90.82, 97.91, 93.19, 95.65, 93.07, 93.65, 90.57,
98.71, 99.97, 95.72, 96.27, 92.67, 93.4 , 98.84, 92.63, 97.03,
93.93, 98.34, 95.82, 99.39, 99.29, 92.74, 90.29, 94.57, 90.69,
93.16, 95.01, 93.16, 97.04, 97.23, 98.9 , 90.26, 97.46, 92.4 ,
90.84, 97.39, 93.56, 97.47, 93.93
]
At the same time, a speed sensor reports the carriage speed in m/s, also every tenth of a second.
carriage_speed = [
1.05, 1.08, 1.04, 1.09, 1.04, 1.06, 1.04, 1.05, 1.05, 1.05, 1.04,
1.01, 1.09, 1.09, 1.05, 1.01, 1.06, 1.03, 1.08, 1.08, 1.09, 1.00,
1.00, 1.00, 1.01, 1.05, 1.06, 1.03, 1.07, 1.02, 1.03, 1.07, 1.07,
1.02, 1.04, 1.06, 1.00, 1.01, 1.00, 1.04, 1.08, 1.00, 1.02, 1.06,
1.03, 1.06, 1.05, 1.01, 1.04, 1.00,
]
Write this function, knowing that power = force × speed:
def calculate_power(force, speed):
"""
Calculate the power according to force and speed.
Parameters
----------
force : list[float]
A list of forces in newtons.
speed : list[float]
A list of speeds in m/s. Its length must be the same as force.
Returns
-------
list[float]
A list of powers in watts.
"""
and use it to calculate the power developed by the person to push the carriage.
Show code cell content
def calculate_power(force, speed):
power = [] # Initialize the output list
for i in range(len(force)):
power.append(force[i] * speed[i])
return power
# Test the function with the supplied data
calculate_power(push_force, carriage_speed)
[95.7495,
107.1576,
96.8344,
100.01840000000001,
98.72720000000001,
102.3324,
95.9608,
100.8105,
97.10400000000001,
99.6345,
95.212,
91.72819999999999,
106.7219,
101.5771,
100.4325,
94.0007,
99.269,
93.2871,
106.6068,
107.9676,
104.3348,
96.27,
92.67,
93.4,
99.8284,
97.2615,
102.85180000000001,
96.74790000000002,
105.22380000000001,
97.73639999999999,
102.3717,
106.24030000000002,
99.2318,
92.09580000000001,
98.3528,
96.1314,
93.16,
95.96010000000001,
93.16,
100.92160000000001,
105.00840000000001,
98.9,
92.0652,
103.3076,
95.17200000000001,
96.2904,
102.2595,
94.4956,
101.36880000000001,
93.93]