Civil and Environmental Engineering Answers

Discuss five different methods of concrete curing

Perfect Gases

0.675kg of gas at 1.4 MN/m² and 280⁰C is expanded to four times the original volume according to the law PV^1.3 =C Determine:

(a) the original and final volume of the gas,

(b) the final pressure of the gas

(c) the final temperature of the gas

Take R=0.287Kj/kg K

0.1m³ of gas is compressed from pressure of 120KN/m² and temperature 25⁰C to a pressure of 1.2MN/m² according to the law PV^1.2 = constant.

Determine,

(a) The work transferred during the compression,

(b) The change in internal energy,

(c) The heat transferred during the compression

Assume , c_v=0.72kJ/kgK         and           R=0.285KJ/kgK

Create an illustration of a series circuit that connects a battery and five capacitors and with a total capacitance of 3/7 F. The total charge in the circuit must be 2/9 C.

A 1OL volumetric container weighing 6.2 kg has been packed with gravel by the required method, and then the total weight is 2 1.3 kg. Calculate the bulk density of gravel. If water is filled into the container, the total weight

Calculate the volume of the solid formed by revolving about the line y=1 the region bounded by the parabola

x

2 = 4y and that line. Take the rectangular elements of area parallel to the axis of revolution.

A 50m tape of standard length has a weight of 0.05 kg/m, with a cross sectional area of 0.04 sq.cm. It has a modulus of elasticity of 2.10 x 106 kg/cm2 . The tape is of standard length under a pull of 5.5 kg when supported throughout its length and temperature of 20°C. This tape was used to measure a distance between A and B and was recorded to be 458.65 meters long. At the time of measurement, the pull applied was 8kg with the tape supported only at its end points and the temperature observed was 18°C. Assuming coefficient of linear expansion of the tape is 0.0000116/°C.

(a) Compute the correction due to the applied pull of 8 kg.

(b) Compute the correction due to weight of tape. 

(c) Compute the true length of the measured line AB due to the combined effects of tension, sag and temperature. 

The hectare is the most commonly used unit of area for large tracts of land. It is equal to 

1. The magnetic declination in a locality is 5°47’E. Given

magnetic bearing AB, N45°27’E, determine the:

a)true bearing reckoned from north

b)true azimuth reckoned from south

Problem Set 1.3.2: Solve this problem on

your own.

Magnetic Declination

3. The magnetic declination in a locality is 4°07’W. Given

geographic bearing AB, S52°04’E, determine the:

a)true bearing reckoned from south

b)magnetic azimuth reckoned from north

4. The magnetic declination in a locality is 3°19’W. Given true

bearing AB, N35°25’E, determine the:

a)magnetic bearing reckoned from north

b)magnetic azimuth reckoned from south

Problem Set 1.3.2: Solve this problem on

your own.

Magnetic Declination

5. The magnetic declination in a locality is 4°07’W. Given

geographic bearing AB, DUE WEST, determine the:

a)true bearing reckoned from south

b)magnetic azimuth reckoned from north

The magnetic declination in a locality is 0°47’W. Given

magnetic bearing AB, S25°40’E, determine the:

a)true bearing reckoned from south

b)true azimuth reckoned from north