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bixtya [17]
3 years ago
14

A 497−g piece of copper tubing is heated to 89.5°C and placed in an insulated vessel containing 159 g of water at 22.8°C. Assumi

ng no loss of water and a heat capacity for the vessel of 10.0 J/°C, what is the final temperature of the system (c of copper = 0.387 J/g·°C)?

Physics
1 answer:
algol [13]3 years ago
6 0

Answer:

36.6 degree centigre

Explanation:

Check the attached file below

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a. amount of time spent swimming

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What is the mass of an object that has a weight of 2867 N?
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3. In some countries AC outlets near bathtubs are restricted to a maximum of 25 V to minimize the chance of dangerous shocks whi
Ierofanga [76]

Answer:

The answer is below

Explanation:

The average resistivity of the human body (apart from surface resistance of the skin) is about 5.0 Ωm. The conducting path between the right and left hands can be approximated as cylinder 1.6 m long and 0.10 m in diameter. The skin resistance can be made negligible by soaking the hands in salt water. (a) What is the resistance between the hands if the skin resistance is negligible? (b) if skin resistance is negligible, what potential difference between the hands is needed for lethal shock current 100 mA?

Solution:

The resistance (R) of a material is given by the formula:

R = ρL / A

where L is the length of the conductor, ρ is resistivity and A is the cross sectional area.

a) R = ρL / A

ρ = 5.0 Ωm, L = 1.6 m, A = π(diameter²) / 4 = π(0.1²)/4 = 0.00785 m²

R = 5(1.6) / 0.00785 = 1018.6 ohm

b) To produce 100 mA, we need to use ohms law:

I = 100 mA = 0.1 A, R = 1018.6 ohm

V = IR = 0.1(1018.6)

V = 101.86 V

7 0
2 years ago
I need help on #5-8.
zavuch27 [327]
Hi,

I've found a link that should assist you or answer your question.
http://click.dji.com/ANbvbbP7bwUWtSACp6U_?pm=link&as=0004

Have a nice day!
4 0
3 years ago
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