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3 years ago

When a person jumps from tree to ground, what happens to the momentum of the person upon striking the ground? ...?

1 answer:

4 0

When a person jumps from a tree to ground, what happens to the momentum of the person upon striking the ground is that it is transferred to earth. The momentum is not lost, it is conserved by being transferred to the ground. But it can also be lost to the impulse.

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A long copper rod of diameter 2.0 cm is initially at a uniform temperature of 100°C. It is now exposed to an air stream at 20°C

Lisa [10]

Answer:

t = 4.0 min

Explanation:

given data:

diameter of rod = 2 cm

T_1 = 100 degree celcius

Air stream temperature = 20 degree celcius

heat transfer coefficient = 200 W/m2. K

WE KNOW THAT

copper thermal conductivity = k = 401 W/m °C

copper specific heat Cp = 385 J/kg.°C

density of copper = 8933 kg/m3

charateristic length is given as Lc

$Lc = \frac{V}{A_s}$

$Lc = \frac{\frac{\pi D^2}{4} L}{\pi DL}$

$Lc = \frac{D}{4}$

$Lc = \frac{0.02}{6} = 0.005 m$

Biot number is given as $Bi = \frac{hLc}{k}$

$Bi = \frac{200*0.005}{401}$

Bi = 0.0025

As Bi is greater than 0.1 therefore lumped system analysis is applicable

so we have

$\frac{T(t) - T_∞}{Ti - T_∞} = e^{-bt}$ ............1

where b is given as

$b = \frac{ hA}{\rho Cp V}$

$b = \frac{ h}{\rho Cp Lc}$

$b = \frac{200}{8933*385*0.005}$

b = 0.01163 s^{-1}

putting value in equation 1

$\frac{25-20}{100-20} = e^{-0.01163t}$

solving for t we get

t = 4.0 min

6 0

3 years ago

If the energy of the n = 1 state is E1 = 4 eV, after what time t does the wave function come back to the form described at t = 0

zloy xaker [14]

Answer:

The time is $3.4\times10^{-16}\ s$

Explanation:

Given that,

Number of energy level n= 1

Energy E₁=4 eV

We need to calculate the time period

Using formula of time period

$T=\dfrac{1}{f}$

$T=\dfrac{h}{E_{2}-E_{1}}$

Where, E = energy

$E_{2}=4E_{1}$

h = Planck constant

Put the value into the formula

$T=\dfrac{6.63\times10^{-34}}{4E_{1}-E_{1}}$

$T=\dfrac{6.63\times10^{-34}}{3E_{1}}$

$T=\dfrac{6.63\times10^{-34}}{3\times4\times1.6\times10^{-19}}$

$T=3.4\times10^{-16}\ s$

Hence, The time is $3.4\times10^{-16}\ s$

8 0

4 years ago

An iron ball and an aluminum ball of mass 100 g each are heated to the same temperature and then cooled to a temperature of 20°

Y_Kistochka [10]

Becaused it the thing was cod that why

4 0

3 years ago

For a solar eclipse to occur which of the following alignments must be necessary

katovenus [111]

Very specific alignment of the Sun, Earth, and Moon. If the Moon is lined up precisely with the Sun from the Earth's point of view, the Moon will block Sunlight from reaching the Earth, causing a solar eclipse.

6 0

3 years ago

What type of spectrum, if any, would be produced if the light radiated by a heated atomic gas were to be dispersed through a pri

Phantasy [73]

Answer:

E. discrete lines of different colors

Explanation:

When light passes through a heated atomic gas and then dispersed through the prism, A line spectrum is obtained always. This happens because when, heated atoms of the gas will be in excited state, these excited state atoms t will emit lights of specific frequency particular to the gas. Thus, a spectra containing lines of discrete colors is obtained on the screen.

Hence, option E is correct.

8 0

4 years ago