Answer:
Speed of the bicyclist when going to city = 14 miles per hour.
Speed while return trip = 8 miles per hour.
Explanation:
Let the speed of the bicyclist when going to city = x miles per hour.
Speed while return trip = x - 6 miles per hour.
Total time taken = 11 hrs = Time for the trip to city + time taken for return trip.
Also, Time = Distance / Time.
So,
56 / x + 56 / ( x -6) = 11
11x² -178x + 336 = 0
Solving for x we get:
Acceptable x = 14 miles per hour.
Speed while return trip = x - 6 miles per hour = 8 miles per hour.
To find the average speed on each part of the trip, use the formula Average speed = Total distance/Total time and set up an equation to solve for the unknown speeds.
To find the average speed on each part of the trip, we can use the formula Average speed = Total distance/Total time. Let's assume the average speed on the first part of the trip (56 miles) is x mph. Since the return trip is made at a speed that is 6 mph slower, the average speed on the second part of the trip is (x - 6) mph. We know that the total time for the round trip is 11 hours. So, we can set up the equation:
56/x + 56/(x - 6) = 11
Now, we can solve this equation to find the value of x, which represents the average speed on the first part of the trip. Once we have x, we can find the average speed on the second part of the trip by subtracting 6 from x.
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The photon energy is 75 keV (kilo-electron volts) for polonium, assuming the free electron has no initial kinetic energy.
The maximum characteristic x-ray photon energy from the capture of a free electron into a K-shell vacancy is equal to the difference in binding energies between the K-shell and L-shell in the atom.
For polonium (Po), the atomic number is 84, which means it has 84 electrons. The K-shell of polonium is filled with 2 electrons, and the L-shell is filled with 8 electrons.
The K-shell binding energy for polonium can be found in a table of atomic data to be around 88 keV. The L-shell binding energy can also be found in the same table to be around 13 keV.
Therefore, the maximum characteristic x-ray photon energy from the capture of a free electron into a K-shell vacancy in polonium is:
E = (K-shell binding energy) - (L-shell binding energy)
= 88 keV - 13 keV
= 75 keV
To know more about binding energies refer here
brainly.com/question/30073915#
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Answer:
7 km
Explanation:
53 km in 1 hour/ 60 minutes. .89 km a minute.
B.The small mass accelerates faster
C.Both accelerate at the same time
Given the amount of voltage and the amount of current drawn by the alarm clock, its resistance is 240 ohms.
Ohm’s law states that "the potential difference between two points is directly proportional to the current flowing through the resistance.
It is expressed as;
V = I × R
Where V is the voltage or potential difference, potential difference, I is the current and R is the resistance.
Given the data in the question;
We substitute our given values into the expression above.
V = I × R
120V = 0.5A × R
R = 120V / 0.5A
R = 240Ω
Therefore, given the amount of voltage and the amount of current drawn by the alarm clock, its resistance is 240 ohms.
Learn more about Ohm's law here: brainly.com/question/2364325
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Answer;
the colors of light that plants require for photosynthesis
Explanation;
The color of light used for photosynthesis depends on the pigment in the plant. For example, green plants with chlorophylls and carotenoids have a maximum activity with violet-blue and red light.
White light contains various colors, including red, orange, yellow, green, blue, indigo and violet. When plants harvest light for photosynthesis, they only absorb a few colors and reflect the rest. Plants appear green because chlorophyll absorbs other colors and reflects green.
Answer:
the colors of the light that plants require for photosynthesis
Explanation:
pretty sure im right