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A man weighs 750 N on the surface of the earth. What would be his weight when standing on the moon? The masses of

the earth and the moon are respectively,5:98 x 1024kg and 7:36 x 1022kg. Their radii are respectively 6:37 x 103km and1:74 x 103km

km

200.5 N

123.7 N

550.4 N

1000.0 N

the earth and the moon are respectively,5:98 x 1024kg and 7:36 x 1022kg. Their radii are respectively 6:37 x 103km and1:74 x 103km

km

200.5 N

123.7 N

550.4 N

1000.0 N

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At what altitude above the earth's surface would the acceleration due to gravity be 4:9ms-2 ? Assume the mean radius

of the earth is 6:4 x 106 metres and the acceleration due to gravity 9:8ms-2 on the surface of the earth

of the earth is 6:4 x 106 metres and the acceleration due to gravity 9:8ms-2 on the surface of the earth

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The instrument used for experimental determination of the value of the universal gravitational constant G is called

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What is the gravitational field strength at a height h above the surface of the Earth? R is the radius of the earth

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1: thr energy absorbed by each molecule(A2) of a substance is 4.4 * 10raised to power -19 j and bond energy per molecule is 4.0 *10 raised to power -19j .the kinetic energy of the molecule per atom will be?

Answered! |

the ratio of energy required to remove an electron from the first three bohrs orbit of hydrogen is?

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When meteors enter the atmosphere, they are typically traveling at around 15km/s. At such

speeds, heat does not have time to be conducted away and even the air has no time to be pushed out of the way. This results in adiabatic compression of the air ahead of the meteor. The density of the atmosphere in kg/m3 is given by

rho=1.22e^(h/8100)

where h is the altitude in meters.

a) For a spherical meteor of radius 5m entering the atmosphere on a vertical trajectory, As a result of compressing all the air in its way into a cylinder of radius 5.5m and height 0.3m, there

will be a very high pressure and temperature in front of the meteor. Calculate the density of air in this compression zone when the meteor has reached an altitude of 4050m by finding the kg of air compressed and the volume of the compression zone. Hint: dm = ?Adh

b) Calculate the original volume of the gas before it was compressed. You may use h=40,000m as the top of the atmosphere.

c) Calculate the average pressure using where h = altitude in meters. Calculate the average pressure as Pavg = [?Pdh]/?h

d) Now find the adiabatic constant using the average pressure from (b) and the original volume from (a). Take Cp/Cv = 1.35 for air.

e) Show that the ideal gas law can be written as where M for air is about

25.6x10-3 kg/mol. f) Use the results from (e) (d) and (a) to get the pressure of the compressed gas at h=4050

meters. Take Cp/Cv = 1.35 for air. Compare the pressure to the ultimate strengths for rock(107Pa) and iron(108Pa) to see if the meteor explodes. g) Using the results from (e) and (f), calculate the temperature in the compression zone at h=4050 meters. h) At the temperature calculated in (g), determine the wavelength of the maximum intensity and

the total power emitted by the hot gas (using a surface area of 2? 5.52 for the flattened spheroid of gas).

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When meteors enter the atmosphere, they are typically traveling at around 15km/s. At such

speeds, heat does not have time to be conducted away and even the air has no time to be pushed out of the way. This results in adiabatic compression of the air ahead of the meteor. The density of the atmosphere in kg/m3 is given by

rho=1.22e^(h/8100)

where h is the altitude in meters.

a) For a spherical meteor of radius 5m entering the atmosphere on a vertical trajectory, As a result of compressing all the air in its way into a cylinder of radius 5.5m and height 0.3m, there

will be a very high pressure and temperature in front of the meteor. Calculate the density of air in this compression zone when the meteor has reached an altitude of 4050m by finding the kg of air compressed and the volume of the compression zone. Hint: dm = ?Adh

b) Calculate the original volume of the gas before it was compressed. You may use h=40,000m as the top of the atmosphere.

In Progress... |

about how many kilograms of boiled would you have to eat to supply energy for half an hour? Assume that your body utilises only 20 percentage of the total stored energy.

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1) A boy of mass 2 kg is thrown vertically upwards with an initial velocity of 20 m/s. What will be its potential energy at the end of 2s?

2) A girl sits and stands repeatedly for 5 minutes. Draw a graph to show the variation in potential energy of her body with time.

2) A girl sits and stands repeatedly for 5 minutes. Draw a graph to show the variation in potential energy of her body with time.

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