# Posts by sand

Total # Posts: 95

**math**

40 out of 72 fish in one lake were tagged by a wildlife researcher. At a second lake, 260 fish were tagged. If fish were tagged at proportional rates in the two lakes, how many fish were in the second lake?

**Geography**

Thank You!

**Geography**

Cause of military overthrow of Nigeria's government in 1980's. I think that it could be that there was pressure on the military because people wanted democratic elections? And the military general didn't want that? The textbook didn't go into details so it is ...

**computer science**

Python 3 For this option, you will first ask "how many rows?", and get a positive integer from them. Next, you will ask "how many columns?", and get another positive integer from them. The next step is to ask for an alignment of each column. They will enter...

**physics**

A body of mass 5.0kg slides from rest down a plane inclined at 30degrees to the horizontal. After sliding 12m down the plane it is found to have a speed of 10m/s. a) How much work has been done in overcoming friction along the plane? b) Calculate the average value of the force...

**physics**

A glass bulb with radius 15 cm is filled with water vapor at a temperature of 500 K. On the exterior of the bulb a spot with area 2.0 mm^2 is placed in contact with liquid nitrogen. This causes the temperature of the spot to drop well below 0◦C. When the gaseous water ...

**physics-kinetic theory**

A glass bulb with radius 15 cm is filled with water vapor at a temperature of 500 K. On the exterior of the bulb a spot with area 2.0 mm^2 is placed in contact with liquid nitrogen. This causes the temperature of the spot to drop well below 0◦C. When the gaseous water ...

**chemistry/physics**

A glass bulb with radius 15 cm is filled with water vapor at a temperature of 500 K. On the exterior of the bulb a spot with area 2.0 mm^2 is placed in contact with liquid nitrogen. This causes the temperature of the spot to drop well below 0◦C. When the gaseous water ...

**physics**

A glass bulb with radius 15 cm is filled with water vapor at a temperature of 500 K. On the exterior of the bulb a spot with area 2.0 mm^2 is placed in contact with liquid nitrogen. This causes the temperature of the spot to drop well below 0◦C. When the gaseous water ...

**chemistry**

A glass bulb with radius 15 cm is filled with water vapor at a temperature of 500 K. On the exterior of the bulb a spot with area 2.0 mm^2 is placed in contact with liquid nitrogen. This causes the temperature of the spot to drop well below 0◦C. When the gaseous water ...

**physics**

A glass bulb with radius 15 cm is filled with water vapor at a temperature of 500 K. On the exterior of the bulb a spot with area 2.0 mm^2 is placed in contact with liquid nitrogen. This causes the temperature of the spot to drop well below 0◦C. When the gaseous water ...

**physics-entropy**

Thank you very much

**physics-entropy**

A collection of 800 indistiguishable coins lie on a table, 720 are heads up and the rest are tails up. The table is violently shook causing many of the coins to flip. Afterward 370 are heads up and the rest are tails up. Compute the quantity Delta lnW for this situation

**physics**

But the answer is 4.6 micro watts Anyhow thanks for your time

**physics**

A long hollow non-conducting cylinder of radius 0.060 m and length 0.70 m carries a uniform charge per unit area of 4.0 C/m^2 on its surface. Beginning from rest, an externally applied torque causes the cylinder to rotate at constant acceleration of 40 rad/s^2 about the ...

**physics**

An ideal gas with r(Gama) = 1.5 occupies a volume of 2.0 L. The gas expands isothermally to a volume of 3.0 L. Alternatively, the gas reaches the same final state by first adiabatically expanding to the final volume then heating isochorically to the final temperature. For ...

**physics**

An ideal gas with r(Gama) = 1.5 occupies a volume of 2.0 L. The gas expands isothermally to a volume of 3.0 L. Alternatively, the gas reaches the same final state by first adiabatically expanding to the final volume then heating isochorically to the final temperature. For ...

**physics**

An ideal gas with r(Gama) = 1.5 occupies a volume of 2.0 L. The gas expands isothermally to a volume of 3.0 L. Alternatively, the gas reaches the same final state by first adiabatically expanding to the final volume then heating isochorically to the final temperature. For ...

**physics**

Thanks a lot.

**physics**

A large container is separated into two halves by a 2.0 cm thick glass divider. The area of the divider is 0.25 m^2 and the thermal conductivity of glass is 0.90W/m•K. Each side is filled with 30 kg of water, specific heat 4180 J/kg•K, at different temperatures. ...

**physics**

A large container is separated into two halves by a 2.0 cm thick glass divider. The area of the divider is 0.25 m^2 and the thermal conductivity of glass is 0.90W/m•K. Each side is filled with 30 kg of water, specific heat 4180 J/kg•K, at different temperatures. ...

**physics**

A large container is separated into two halves by a 2.0 cm thick glass divider. The area of the divider is 0.25 m^2 and the thermal conductivity of glass is 0.90W/m•K. Each side is filled with 30 kg of water, specific heat 4180 J/kg•K, at different temperatures. ...

**physics**

A transparent hemisphere of refractive index 1.5 and radius of curvature 20 cm is placed flat side down on a piece of paper with a 4.0 mm tall letter G written on it such that G is in the center.What is the size of G when viewed directly from above

**physics**

Your answer quite unrelated

**physics**

A transparent hemisphere of refractive index 1.5 and radius of curvature 20 cm is placed flat side down on a piece of paper with a 4.0 mm tall letter G written on it such that G is in the center.What is the size of G when viewed directly from above

**physics**

A transparent hemisphere of refractive index 1.5 and radius of curvature 20 cm is placed flat side down on a piece of paper with a 4.0 mm tall letter G written on it such that G is in the center.What is the size of G when viewed directly from above

**physics**

A transparent hemisphere of refractive index 1.5 and radius of curvature 20 cm is placed flat side down on a piece of paper with a 4.0 mm tall letter G written on it such that G is in the center.What is the size of G when viewed directly from above

**physics**

A transparent hemisphere of refractive index 1.5 and radius of curvature 20 cm is placed flat side down on a piece of paper with a 4.0 mm tall letter G written on it such that G is in the center.What is the size of G when viewed directly from above?

**physics**

Thanks a lot

**physics**

A cylinder with height 5.0 m is made by mixing materials with different indexes of refraction. The mixture is prepared such that the index of refraction is 1.0 on one end, 2.6 on the other end and varies linearly in between. How long does it take light to travel through the ...

**physics**

Two identical planets, each of mass M, have their centers a distance D apart. Halfway between them, at gravitational equilibrium, lies a satellite of mass m. The satellite is then displaced a small distance and released, after which it undergoes SHM. a) In what direction must ...

**physics**

The temperature in a room is kept at a constant 20 °C but the humidity is only 20%. If the room has a volume of 30m³, and the room’s door and windows closed, how many kilograms of water must be put into the vaporizer to increase the humidity from 20% to 85% ( the...

**physics**

A 90 cm length of steel wire with a diameter of 0.5 mm is stretched between the inside walls of an oven the wire is just taut with no tension when the temperature in the oven is 250 °C. What is the the tension force in the wire when the oven cools to a temperature of 150 &...

**physics**

The temperature in a room is kept at a constant 20 °C but the humidity is only 20%. If the room has a volume of 30m³, and the room’s door and windows closed, how many kilograms of water must be put into the vaporizer to increase the humidity from 20% to 85% ( the...

**physics**

The temperature in a room is kept at a constant 20 °C but the humidity is only 20%. If the room has a volume of 30m³, and the room’s door and windows closed, how many kilograms of water must be put into the vaporizer to increase the humidity from 20% to 85% ( the...

**physics**

A 90 cm length of steel wire with a diameter of 0.5 mm is stretched between the inside walls of an oven the wire is just taut with no tension when the temperature in the oven is 250 °C. What is the the tension force in the wire when the oven cools to a temperature of 150 &...

**physics**

A 90 cm length of steel wire with a diameter of 0.5 mm is stretched between the inside walls of an oven the wire is just taut with no tension when the temperature in the oven is 250 °C. What is the the tension force in the wire when the oven cools to a temperature of 150 &...

**Statistics-Probability**

Consider a binomial random variable X with parameters(4,1/2). Find the conditional probability mass function of X given that X is odd

**Statistics-Probability**

Data collected on volcanic eruptions give a mean time between eruptions of 29 months. Assume these eruptions occur as a Poisson process in time, find the: (a) Expected number of eruptions during the five-year period beginning from the time you have read this question. (b) ...

**Math-Probability**

Consider a collection of n biased coins, each showing Heads with probability p and Tails with probability 1-p , independently of the others. The coins are tossed and all coins showing Heads are collected together and tossed again. Write down an expression for the probability ...

**Math-Probability**

Consider a collection of n biased coins, each showing Heads with probability p and Tails with probability 1-p , independently of the others. The coins are tossed and all coins showing Heads are collected together and tossed again. Write down an expression for the probability ...

**Statistics-Probability**

Data collected on volcanic eruptions give a mean time between eruptions of 29 months. Assume these eruptions occur as a Poisson process in time, find the: (a) Expected number of eruptions during the five-year period beginning from the time you have read this question. (b) ...

**Math-Probability**

Consider a collection of n biased coins, each showing Heads with probability p and Tails with probability 1-p , independently of the others. The coins are tossed and all coins showing Heads are collected together and tossed again. Write down an expression for the probability ...

**Math-Probability**

Consider a collection of biased coins, each showing Heads with probability and Tails with probability , independently of the others. The coins are tossed and all coins showing Heads are collected together and tossed again. Write down an expression for the probability mass ...

**Math-Probability**

Data collected on volcanic eruptions give a mean time between eruptions of 29 months. Assume these eruptions occur as a Poisson process in time, find the: (a) Expected number of eruptions during the five-year period beginning from the time you have read this question. (b) ...

**physics**

A 3.12 kg bowling ball traveling at 15.3 m/s to the right collides with a 2.15 kg bocce ball traveling at 7.52 m/s to the right. The final velocity of the bowling ball is 2.33 m/s to the left. Determine the final velocity of the bocce ball. What is the magnitude of the force ...

**Statistics**

Data collected on volcanic eruptions give a mean time between eruptions of 29 months. Assume these eruptions occur as a Poisson process in time, find the: (a) Expected number of eruptions during the five-year period beginning from the time you have read this question. (b) ...

**physics**

Two fighter jets are flying towards each other. Jet A, with a mass of 15000 Kg, is traveling to the right with a speed of 255 m/s, whereas Jet B, with a mass of 34000 kg, is traveling to the left at 145 m/s. If the collision is perfectly inelastic, determine the final velocity...

**chemistry**

A strip of aluminium of mass 40.7g is dropped into a beaker of dilute hydrochloric acid. Calculate the work done (in J) on the surrounding atmosphere (1atm pressure, 26.1oC ) by the evolution of hydrogen in the subsequent reaction. State any assumptions you have made.

**chemistry**

A sample of argon of mass 10.4 g occupies 2100 ml at 30 oC . (i) Calculate the work done by the gas when it expands isothermally against a constant external pressure of 31.1kPa until its volume has increased by 483.1ml. (ii) Calculate the work done by the gas if the same ...

**physics**

Thanks a lot

**physics**

I had already used the above formula and calculated k = 315.8 N/m But the book answer is k = 101 N/m Hence this query

**physics**

A 0.5 Kg mass is supported by a spring . The system is set in vibration at its natural frequency of 4 Hz with an amplitude of 5 Cm.Find the spring constant .

**physics**

A 0.5 Kg mass is supported by a SPRING . The system is set in vibration at its natural frequency of “ 4 Hz “ with an amplitude of “ 5 Cm “ . Find the spring constant .

**physics**

Thanks for the guidelines & reference

**physics**

An aluminum cup is filled to the brim with precisely 0.400 liters of mercury at a temperature of 20 °C. The cup and mercury are then allowed to warm up to a temperature of 50 °C Calculate the change in volume of the cup and the change in volume of the mercury? How much...

**physics**

An aluminum cup is filled to the brim with precisely 0.400 liters of mercury at a temperature of 20 °C. The cup and mercury are then allowed to warm up to a temperature of 50 °C Calculate the change in volume of the cup and the change in volume of the mercury? How much...

**physics**

Thanks for your time

**physics**

A portable steel tank with a volume 35 liters (0.035m³) holds helium gas used for filling party balloons. The pressure in the tank is 120atm when at room temperature of 22 °C. How many moles of helium gas are in the tank? Each balloon has a volume of 2.5liters when ...

**physics**

Thanks for your guidance

**physics**

The temperature in a room is kept at a constant 20 °C but the humidity is only 20%. If the room has a volume of 30m³, and the room’s door and windows closed, how many kilograms of water must be put into the vaporizer to increase the humidity from 20% to 85% ( the...

**physics**

THANK YOU

**physics**

A brick wall with a thermal emissivity of 0.8 is heated by the sun all day and is at a temperature of 25 °C in early evening. A pedestrian walking past the wall feels its warmth radiating in to the cool evening air. The wall has surface area of 5m^2. What is the total out ...

**physics**

Thanks for your time

**physics**

A large, cylindrically-shaped weight is suspended from a long spring found hanging from a rafter. The weight is slender metal cylinder about two meters long that is suspended with its flat bottom about half meter above the level concrete floor. When a 1 kg mass is added, the ...

**physics**

Thanks for answering my problem.But I did not ask it using different name.I used the same name "sand"

**physics**

A chandelier of mass 250 kg is hung vertically from a ceiling using a 1.25 m long brass rod of square cross-section of sides 0.4 cm each. How much will the rod stretch when the chandelier is hung? By what factor is the minimum breaking load greater than the weight of the ...

**physics**

A chandelier of mass 250 kg is hung vertically from a ceiling using a 1.25 m long brass rod of square cross-section of sides 0.4 cm each. How much will the rod stretch when the chandelier is hung? By what factor is the minimum breaking load greater than the weight of the ...

**physics**

Thanks for the timely help

**physics**

A guitar string 75.0cm in length is strung to play the note C at a frequency of 880Hz as it 3rd harmonic. a.) what is the length of the transverse wave on the guitar string? b) what is the speed of this transverse wave along the guitar string? c.) what is the length of the ...

**physics**

Thank you very much

**physics**

A ladder of length 5m has mass of 25 Kg. the ladder is leaned against a frictionless vertical wall at an angle of 10 degrees with the vertical. A repairman with a mass of 82Kg needs to stand on an upper rung of the ladder that is 1 m from the end. What is the minimum ...

**physics**

Thanks a lot

**physics**

A lead brick with volume of 7*10^-4m^3 is floating in bath of liquid mercury. a) What fraction of the lead brick’s volume is above the surface of mercury? A student uses a stick to push the lead brick below the mercury surface so that it is completely submerged. What ...

**physics**

Thank you

**physics**

A 5kg mass is sliding at a speed of 7 m/s on horizontal sheet of frictionless ice when it smacks in to a wall of the ice rink. There are bumpers made of elastic springs placed along the wall for protection. The mass hits the bumper, compressing it by 5cm and momentarily comes ...

**physics**

A lead brick with volume of 7*10^-4m^3 is floating in bath of liquid mercury. What fraction of the lead brick’s volume is above the surface of mercury? A student uses a stick to push the lead brick below the mercury surface so that it is completely submerged. What force ...

**physics**

A ladder of length 5m has mass of 25 Kg. the ladder is leaned against a frictionless vertical wall at an angle of 10 degrees with the vertical. A repairman with a mass of 82Kg needs to stand on an upper rung of the ladder that is 1m from the end. What is the minimum ...

**physics**

A ladder of length 5m has mass of 25 Kg. the ladder is leaned against a frictionless vertical wall at an angle of 100 with the vertical. A repairman with a mass of 82Kg needs to stand on an upper rung of the ladder that is 1m from the end. What is the minimum coefficient of ...

**physics**

Thanks a lot

**physics**

A manufacturer wishes to produce crude benzene models for the chemistry department. The manufacturer plans to do this by punching regular hexagons out of steel. If the steel plate is 0.500 cm thick, What is the minimum shearing force needed to punch regular hexagons with sides...

**physics**

1.A 500.0 g mass is placed on a 20.0 cm cube of gelatin. The 500.0 g mass (a 5.00 cm diameter disk) depresses the gelatin 0.243 mm. What is Young's modulus for this gelatin? ____________N/m^2 Later, a 2.00 kg mass disk (5.00 cm in diameter) is placed on the gelatin and the...

**physics**

1.A 500.0 g mass is placed on a 20.0 cm cube of gelatin. The 500.0 g mass (a 5.00 cm diameter disk) depresses the gelatin 0.243 mm. What is Young's modulus for this gelatin? ____________N/m^2 Later, a 2.00 kg mass disk (5.00 cm in diameter) is placed on the gelatin and the...

**physics**

1.A 500.0 g mass is placed on a 20.0 cm cube of gelatin. The 500.0 g mass (a 5.00 cm diameter disk) depresses the gelatin 0.243 mm. What is Young's modulus for this gelatin? ____________N/m^2 Later, a 2.00 kg mass disk (5.00 cm in diameter) is placed on the gelatin and the...

**physics**

A planet orbits its star in a circular orbit (uniform circular motion) of radius 1.62x10^11 m. The orbital period of the planet around its star is 37.0 years. Determine the following quantities for this orbital motion: Angular acceleration , Tangential acceleration, Radial ...

**physics**

A planet orbits its star in a circular orbit (uniform circular motion) of radius 1.62x10^11 m. The orbital period of the planet around its star is 37.0 years. Determine the following quantities for this orbital motion: Angular acceleration , Tangential acceleration, Radial ...

**physics**

A planet orbits its star in a circular orbit (uniform circular motion) of radius 1.62x10^11 m. The orbital period of the planet around its star is 37.0 years. Determine the following quantities for this orbital motion: Angular acceleration , Tangential acceleration, Radial ...

**physics**

A planet orbits its star in a circular orbit (uniform circular motion) of radius 1.62x10^11 m. The orbital period of the planet around its star is 37.0 years. Determine the following quantities for this orbital motion: Angular acceleration , Tangential acceleration, Radial ...

**physics**

A planet orbits its star in a circular orbit (uniform circular motion) of radius 1.62x10^11 m. The orbital period of the planet around its star is 37.0 years. Determine the following quantities for this orbital motion: Angular acceleration , Tangential acceleration, Radial ...

**physics**

A steel beam (with linear mass density of 6.88 kg/m) has a total length of 10.0m and is suspended by two cables such that the beam hangs horizontally. Cable A is attached 1.00 m from the left end of the beam and cable B is attached 3.00 m from the right end of the beam. A 75.0...

**physics**

Thanks a lot

**physics**

A rocket flies upward with a velocity of 1050 km/h and at an angle of 30 degrees to the vertical. If the rocket runs out of fuel determine: (i) The maximum additional altitude, h. (ii) The corresponding time. (iii) The horizontal distance at this time The gravitational ...

**chem**

how many moles of Si(OH)4 form when 4.01 moles of H2O react with an excess of SiCl4?

**economics**

what is absolute advantage of 200 lbs corn and 50 pigs

**Com140**

how to create a table day by day job employment search?