Answer:
Average speed = 0.0075 m/s
Average velocity = 0.0025 m/s along forward direction
Explanation:
Speed is the ratio of distance and time and velocity is the ratio of displacement and time.
Distance traveled = 10 + 5 = 15 cm = 0.15 m
Displacement = 10 - 5 = 5 cm = 0.05 m
Time = 20 seconds
Average speed = 0.0075 m/s
Average velocity = 0.0025 m/s along forward direction
C. longest wavelength
Explanation:
Photons with the lowest energy have the longest wavelength and the shortest frequency.
The energy of photons is given as:
E = hf = 
where f is the frequency of photon
h is the planck's constant
∧ is wavelength
c is the speed of light
The more the frequency, the higher the energy of the photon.
Photons with low energy have long wavelength.
Learn more:
Wavelength brainly.com/question/6352445
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Answer;
9 miles per hour.
Solution;
Convert 41 minutes to seconds and add 25 seconds to that, then divide by 60 to convert to hours.
41 min = 2460 seconds (+ 25 seconds) = 2485/ 60 = 41.417 minutes (0.6903 hours).
Speed = 10 km/0.6903 hr = 14.4869 km/hr
But 1 mile = 1.60934 km
Thus; 14.4869 kilometers = 9.0017 miles.
So the runner's average speed is roughly 9 miles per hour.
Answer:
The efficiency is define as the ratio between the work performed and the heat input at the higher temperature
Explanation:
The efficiency of the heat engine work done using working substance at higher temperature relates to the wasted energy released to the environment through the derived formula below:
Qin = quantity of heat from a working substance such steam or water used to drive electric generator at higher temperature for example
Qout = quantity of heat remaining in the working substance after the work has been done
Qin = Wout + Qout where Wout is the significant work that the higher temperature working substance has been used to do
Wout = Qin - Qout
efficiency = Wout / Qin = ( Qin - Qout) / Qin = Qin / Qin - Qout / Qin = 1 - (Qout / Qin) and
Carnot theorem relates the efficiency with the formula below:
eff( max) = 1 - ( Tc/Th) where Tc is the temperature of the cold reservoir where the working substance is poured and Th is the temperature of the working substance before it input into the thermal engine.
Answer:
Angular acceleration of the barrel is 0.011 rad/s².
Explanation:
It is given that,
Initial speed of the barrel ride = 0
Final speed of the barrel ride, 
On converting rev/sec to rad/sec as :
Since, 1 revolution = 2π radian
So, 
Time, t = 7.26 s
We need to find the angular acceleration of the barrel during that time. It is given by :
So, the angular acceleration of the barrel is 0.011 rad/s². Hence, this is the required solution.
