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jeffhuffle17
24.12.2019 •
Physics
Consider a system of an 85.0 kg man, his 21.0-kg dog, and the earth. the gravitational potential energy of the system increases by 2.40 103 j when the man climbs a spiral staircase from the first to the second floor of an apartment building. if his dog climbs a normal staircase from the same first floor to the second floor, by how much does the potential energy of the system increase (in j)?
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Ответ:
593 J
Explanation:
The change in the potential energy (PE) can be calculated using the following expression.
PE = m × g × h
where,
m: mass
g: acceleration due to the gravity
h: height (vertical distance from the first floor to the second floor)
For the 85.0-kg man,
PE = m × g × h
2.40 × 10³ J = 85.0 kg × 9.81 m/s² × h
h = 2.88 m
For the 21.0-kg dog,
PE = m × g × h
PE = 21.0 kg × 9.81 m/s² × 2.88 m = 593 J
Ответ:
I=V/R
I=60/10
I=6
Therefore, the current flowing through the circuit will be 6A (Amperes)