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ruslelena [56]
2 years ago
13

you are riding an elevator upwards at 2.20m/s. you have a balance accurately calibrated in newtons. when you hang a mass of 15.0

the balance, the reading of the balance is
Physics
1 answer:
Nady [450]2 years ago
5 0

Answer:

<h2> 33N</h2>

Explanation:

Note: the unit for acceleration  in m/s^2

Also, the unit of the mass in the problem is assumed to be in kg

We are going to use newtons second law of motion which expresses the weight in an elevator as

F=ma

Given data

Acceleration of the elevator a= 2.2m/s^2

mass m = 15kg

substituting the data in the expression for force is

F=2.2*15

F= 33N

The reading of the balance is 33N

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2 years ago
In Fig.25-46,how much charge is stored on the parallel-plate capacitors by the 12.0 V battery? One is filled with air,and the ot
Fittoniya [83]

Answer:

Q=7.9\times 10^{-10}\ C

Explanation:

Given that

V= 12 V

K=3

d= 2 mm

Area=5.00 $ 10#3 m2

Assume that

$ = Multiple sign

# = Negative sign

A=5\times 10^{-3}\ m^2

We Capacitance given as

For air

C_1=\dfrac{\varepsilon _oA}{d}

C_1=\dfrac{\varepsilon _oA}{d}

C_1=\dfrac{8.85\times 10^{-12}\times 5\times 10^{-3}}{2\times 10^{-3}}

C_1=2.2\times 10^{-11}\ F

C_2=\dfrac{K\varepsilon _oA}{d}

C_2=\dfrac{3\times 8.85\times 10^{-12}\times 5\times 10^{-3}}{2\times 10^{-3}}\ F

C_2=6.6\times 10^{-11}\ F

Net capacitance

C=C₁+C₂

C=8.8\times 10^{-11}\ F

We know that charge Q given as

Q= C V

Q=12\times 6.6\times 10^{-11}\ C

Q=7.9\times 10^{-10}\ C

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3 years ago
Which of the following materials offer the least electrical resistance? Pure water, wood, salt water, glass
Vanyuwa [196]

Salt water offers the least electrical resistance.

<u>Explanation:</u>

Least electrical resistance indicates that any material which readily allows the electric current through itself, and shows more conductivity.

Here pure water doesn't contain any ions, so it is a bad conductor.

Wood and glass are also bad conductors of electricity.

Salt water contains ions, which conducts electricity which means it shows least electrical resistance.

5 0
3 years ago
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