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4 years ago

HEY CAN ANYONE PLS PLS ANSWER DIS I RLY NEED IT

1 answer:

jeka944 years ago

8 0

Place the object in an electronic balance and measure its mass.
Place a measured amount of water in the cylinder.
Place the object in the cylinder so that it’s fully submerged.
Measure the new level of the liquid and subtract the original level. This is equal to the volume of the object.

Density = mass / volume.

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If the intensity level by 15 identical engines in a garage is 100 dB, what is the intensity level generated by each one of these

goblinko [34]

To develop this problem we will apply the concepts related to Sound Intensity. This can be defined as the power carried by sound waves per unit area in a direction perpendicular to that area. Mathematically it can be written as,

$\Delta L = 10log(n)$

$\Delta L$ = Level Difference

n = Number of equal loud sound sources

n = 15

Therefore replacing we have,

$\Delta L = 10 log (n)\\\Delta L = 10 log (15)\\\Delta L = 10*1.176\\\Delta L = 11.76dB$

Therefore over 100dB the total difference intensity level would be

$L_T = L_0 -\Delta L$

Here,

$L_0 = \text{ Total intensity}$

$\L_T = 100 -11.76$

$_T= 88.24dB$

The intensity level generated by one engine is

$L_T = 88.44dB$

8 0

3 years ago

Does laser refract through water or reflect ?

Novosadov [1.4K]

Answer:

Calm water looks like a mirror from below because underwater light is entirely reflected when it comes from beyond a certain angle. This so-called total internal reflection also allows low power lasers to bend the waters surface.

thank you

pls mark as BRAINLIST

7 0

3 years ago

Read 2 more answers

Divide 0.0081 meters by 300 seconds and express the answer in scientific notation

sattari [20]

The answer is: [B]: 2.7 * 10⁻⁵ m / s .
_____________________________________________________

0.00081 m ÷ 300 s = 0.000027 m / s = 2.7 * 10⁻⁵ m /s ; which is:
_____________________________________________________
Answer choice: [B] .
_____________________________________________________

8 0

3 years ago

An ion source is producing 6Li ions, which have charge +e and mass 9.99 × 10-27 kg. The ions are accelerated by a potential diff

Mkey [24]

Answer:

$5.38\cdot 10^5 V/m$

Explanation:

At first, the 6Li ions are accelerated by the potential difference, so their gain in kinetic energy is equal to the change in electric potential energy; so we can write:

$q\Delta V=\frac{1}{2}mv^2$

where

$q=+e=+1.6\cdot 10^{-19}C$ is the charge of one 6Li ion

$\Delta V=9.2 kV=9200 V$ is the potential difference through which they are accelerated

$m=9.99\cdot 10^{-27}kg$ is the mass of each ion

v is the final speed reached by the ions

Solving for v, we find:

$v=\sqrt{\frac{2q\Delta V}{m}}=\sqrt{\frac{2(1.6\cdot 10^{-19})(9200)}{9.99\cdot 10^{-27}}}=5.43\cdot 10^5 m/s$

After that, the ions pass into a region with a uniform magnetic field of strength

$B=0.99 T$

The magnetic field exerts a force perpendicular to the direction of motion of the ions, and this force is given by

$F=qvB$

In order to make the ions passing through undeflected, there should be an electric force balancing this magnetic force. The electric force is given by

$F=qE$

where E is the strength of the electric field.

Since the two forces must be balanced,

$qE=qvB$

From which we get

$E=vB$

So the strength of the electric field must be

$E=(5.43\cdot 10^5)(0.99)=5.38\cdot 10^5 V/m$

4 0

3 years ago

The Titanic was found in 1985 lying on the bottom of the North Atlantic at a depth of 2.5 miles. What is the pressure at this de

yan [13]

Answer:

39428.93 N/m²

Explanation:

Pressure: This can be defined as the force acting normally perpendicularly per unit area of surface. The S.I unit of pressure is N/m²

The pressure in a fluid is given as

P = ρgh............................. Equation 1

Where P = pressure, ρ = density, h = height, g = acceleration due to gravity.

Note: The North Atlantic is an ocean, and it contains water

Given: h = 2.5 mile

If 1 mile =

1 609.344 meters,

Then 2.5 miles = (1609.344×2.5 ) m = 4023.36 m.

Constant: g = 9.8 m/s², ρ = density of water = 1.0 g/m³

Substituting these values into equation 1

P = 1×4023.36×9.8

p = 39428.93 N/m²

Thus the pressure at that depth = 39428.93 N/m²

3 0

3 years ago