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3 years ago

If a train travels at a speed of 40 km/h for 3 hours, how far will it travel

Physics

2 answers:

VikaD [51]3 years ago

8 0

120 km/3 hours. 40/1=?/3 1x3=3 hours so 40x3=120 km

Alik [6]3 years ago

4 0

Answer:

120 meters

Explanation:

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The pressure increases by 1.0 x 104 N/m2 for every meter of depth beneath the surface of the ocean. At what depth does the volum

kotykmax [81]

Given that,

Bulk modulus $B= 2.6\times10^{10}\ N/m^2$

Change in volume $\Delta V=6.0\times10^{-10}\ m^3$

Edge $a= 5.4\times10^{-2}\ m$

The volume of the cube at the ocean's surface will be

$V_{0}=a^3$

Where, a = edge

Put the value into the formula

$V_{0}=(5.4\times10^{-2})^3$

$V_{0}=0.00016\ m^3$

We need to calculate the change in pressure

Using formula of pressure

$\Delta P=-B\dfrac{\Delta V}{V_{0}}$

Put the value into the formula

$\Delta P=-(2.6\times10^{10})\times\dfrac{(-6.0\times10^{-10})}{0.00016}$

$\Delta P=97500\ N/m^2$

The pressure increases by $1.0\times 10^{4}\ N/m^2$ for every meter of depth

We need to calculate the depth

Using formula for depth

$depth=\dfrac{97500}{1.0\times10^{4}}$

$depth=9.75\ m$

Hence, The depth is 9.75 m.

6 0

3 years ago

HELP MEEEE NO LINKS

Vera_Pavlovna [14]

Answer:

The answer would be TRUE

Explanation:

The mean resonance frequency of the human middle ear under air conduction (AC) excitation is known to be around 0.8-1.2 kHz. However, studies suggest that the mean resonance frequency under bone conduction (BC) excitation is at a higher frequency around 1.5-2 kHz.

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7 0

3 years ago

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An object of mass 2.0 kg is attached to the top of a vertical spring that is anchored to the floor. The unstressed length of the

poizon [28]

Answer:

The value is $A = 0.014 \ m$

Explanation:

From the question we are told that

The mass of the object is $m = 2.0 \ kg$

The unstressed length of the string is $l = 0.08 \ m$

The length of the spring when it is at equilibrium is $l_e = 5.9 \ cm = 0.059 \ m$

The initial speed (maximum speed)of the spring when given a downward blow $v = 0.30 \ m/s$

Generally the maximum speed of the spring is mathematically represented as

$u = A * w$

Here A is maximum height above the floor (i.e the maximum amplitude)

and $w$ is the angular frequency which is mathematically represented as

$w = \sqrt{\frac{k}{m} }$

$u = A * \sqrt{\frac{k}{m} }$

=> $A = u * \sqrt{\frac{m}{k} }$

Gnerally the length of the compression(Here an assumption that the spring was compressed to the ground by the hammer is made) by the hammer is mathematically represented as

$b = l -l_e$

=> $b = 0.08 - 0.05 9$

=> $b = 0.021 \ m$

Generally at equilibrium position the net force acting on the spring is

$k * b - mg = 0$

=> $k * 0.021 - 2 * 9.8 = 0$

=> $k = 933 \ N/m$

$A = 0.30 * \sqrt{\frac{2}{933} }$

=> $A = 0.014 \ m$

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3 years ago

Question 4 of 10

Mariana [72]

Answer:

Explanation:

Thermodynamics is the study of how different types of energy is transferred through the chemical systems

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2 years ago

Conduction is the movement of heat energy because of

Ira Lisetskai [31]

Answer:

Conduction occurs when a substance is heated, particles will gain more energy, and vibrate more. These molecules then bump into nearby particles and transfer some of their energy to them. This then continues and passes the energy from the hot end down to the colder end of the substance.

Explanation:

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6 0

3 years ago

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