(a) how many joules of energy are the equivalent of one
jelly doughnut?
We are already given the energy which is equal to 695
kcal. We know that in 1 kcal, there is 4184 Joules, therefore:
Energy = 695 kcal * (4184 J / 1 kcal)
Energy = 2,907,880 J
(b) how many stairs must the woman climb to perform an
amount of mechanical work equivalent to the food energy in one jelly doughnut? assume
the height of a single stair is 15 cm. stairs
We can solve this by using the Potential Energy formula:
PE = m g h
2,907,880 J = 44 kg * 9.8 m/s^2 * h
h = 6,743.7 m
So the number of stairs is:
stairs = 6,743.7 m / 0.15 m
stairs = 44,958
(c) if the human body is only 28% efficient in converting
chemical energy to mechanical energy, how many stairs must the woman climb to
work off her breakfast?
So the number of stairs will be:
stairs = 44,958 / 0.28
stairs = 160,564
The main applications of Ohm's law are: To determine the voltage, resistance or current of an electric circuit. Ohm's law is used to maintain the desired voltage drop across the electronic components. Ohm's law is also used in dc ammeter and other dc shunts to divert the current.
Answer:
The acceleration of each ball while in motion is acceleration due to gravity, that is 9.81 m/s²
Explanation:
Here one child simply drops a ball. At the same time, the second child throws a ball downward so that it has an initial speed of 10 m/s.
In first case acceleration on the ball is acceleration due to gravity,
In second case also acceleration on the ball is acceleration due to gravity,
Only gravitational force is acting on both cases so their acceleration is acceleration due to gravity.
The acceleration of each ball while in motion is acceleration due to gravity, that is 9.81 m/s²
Due to the principle of conservation of energy, the work done by the engine to move the scooter converts into kinetic energy of the scooter:
where M is the combined mass of scooter and rider, and v is the velocity of the scooter. Therefore, we can find the velocity as:
Applying Kirchoff's junction rule; the power source and current split when the parallel circuit has two branches.
Discussion:
This forms a basis for the Kirchoff's Junction rule.
In a circuit of resistors; a parallel arrangement of the resistors leaves the current divided in a ratio according to the resistance of the resistors.
However, the case is not the same for a series connection
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