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3 months ago

Why must the height of the meniscus in the graduated cylinder match the height of the water in the tub when measuring volume?

Physics

1 answer:

serg [3.5K]3 months ago

8 0

Answer:

Refer to the explanation.

Explanation:

To grasp the concept, start with the fundamental idea of meniscus in a graduated cylinder.

"The meniscus refers to the curve noticed at the surface of a liquid due to its container. Depending on liquid surface tension and its adherence to the container’s walls, this meniscus may be concave or convex".

Given this definition, when measuring the volume of water, it's crucial to read the measurement at the bottom of the meniscus curve, as water forms a concave shape.

Taking the reading at eye level ensures an accurate volume, as it aligns with this method.

Additionally, this way of reading balances total pressure with atmospheric pressure by adjusting the cylinder's height to match the water level.

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The relatively high resistivity of dry skin, about 1×106Ω⋅m, can safely limit the flow of current into deeper tissues of the bod

ValentinkaMS [3465]

Answer:

The resistance of the skin is 98 kΩ

Explanation:

Given:

Resistivity $\rho = 1 \times 10^{6}$ Ωm

Thickness $t = 1.5 \times 10^{-3}$ m

Resistivity of the skin:

$R = \frac{\rho t}{A}$

With assumed radius for the worker's palm,

$r = 7 \times 10^{-2}$ m

Area of the worker's palm,

$A = \pi r^{2}$

$A = 3.14 \times 49 \times 10^{-4}$

$A = 1.53 \times 10^{-2}$ $m^{2}$

Thus the resistance of palm is,

$R = \frac{10^{6} \times 1.5 \times 10^{-3} }{1.53 \times 10^{-2} }$

$R = 98 \times 10^{3}$ Ω

Consequently, the resistance of the skin is 98 kΩ

3 0

2 months ago

Solenoid 2 has twice the diameter, twice the length, and twice as many turns as solenoid 1. How does the field B2 at the center

Sav [3153]

Complete Question

The entire question is displayed in the first uploaded image

Answer:

The right choice is option 3

Explanation:

The question informs us that

The diameter of solenoid 1 is $d_1$

The length of solenoid 1 is $L_1$

The number of turns of solenoid is $N_1$

The diameter of solenoid 2 is $d_2 = 2d_1$

The length of solenoid 2 is $L_2 = 2L_1$

The number of turns of solenoid 2 is $N_2 = 2 N_1$

Typically, the magnetic field in a solenoid can be expressed mathematically as

$B = \frac{\mu_o * N * I }{L}$

According to this formula we find that

$B \ \alpha \ \frac{N}{L}$

$B = C \frac{N}{L}$

Here C denotes constant

=> $C = \frac{B * \frac{L}{N}$

=> $\frac{B_1 * \frac{L_1}{N_1} = \frac{B_2 * \frac{L_2}{N_2}$

=> $\frac{B_1}{B_2 } = \frac{N_1 L _2}{ N_2L_1}$

=> $\frac{B_1}{B_2 } = \frac{N_1 * (2 L_1)}{ (2 N_2)L_1}$

=> $\frac{B_1}{B_2 } = 1$

=> $B_2 = B_1$

4 0

3 months ago

When a pendulum is pulled back from its equilibrium position by 10∘, the restoring force is 1.0 N. When it is pulled back to 30∘

Maru [3345]

Answer: B

Explanation: I choose B because when you pull back something, the force it exerts when released is greater than when you hold it back, especially for a rubber band.

5 0

3 months ago

Read 2 more answers

A sinusoidal electromagnetic wave of frequency 6.10×1014hz travels in vacuum in the +x direction. the magnetic field is parallel

Yuliya22 [3333]

Part a) The connection between the electric field and the magnetic field in an electromagnetic wave is
$E=cB$
where
E signifies the strength of the electric field
B indicates the strength of the magnetic field
c represents the speed of light
Using the equation, we determine:
$E=cB=(3 \cdot 10^8 m/s)(5.80 \cdot 10^{-4} T)=1.74 \cdot 10^5 N/C$

Part b) The text does not clarify the orientation of the magnetic field on the y-axis: I speculate it points in the y+ direction.
The direction of the electric field can be established using the right-hand rule, which states:
- the index finger shows the direction of E
- the middle finger indicates the orientation of B
- the thumb reveals the propagation direction of the wave
Because the wave propagates in the x+ direction, and the magnetic field in the y+ direction, we conclude that the electric field direction (index finger) must be z-.

7 0

3 months ago