Civil and Environmental Engineering Answers

Each filter is washed for 5 minutes every 24 hours at a wash rate of 10 mm/sec/m2 of filter area. The filter remains out of operation for a total interval of 30 minutes per day. Calculate the percentage of filter output used for washing. 

The sketch shows an object of mass 10 kg resting on a smooth plane at 25° to the horizontal. The 10 kg mass is attached to a hanging mass of 1 kg by a light cord passing over a light, frictionless pulley at the top of the plane. Determine the direction of movement when the masses are released and then use Newton’s second law to calculate the acceleration of the system and the tension in the cord.

The radius of a circular oil slick on the surface of a pond is increasing at the rate of 10 meters/min. At what rate is the circle's area changing when the radius of the oil slick is 20 m.

the standard length of the tape was known to be 30.015 at 25 c and 50 N tensions whose normal length is 30m. the tap was is used to measure a base line suspending it between supports and the following measurement were recorded:-

measured length =92.441

elevation difference between the two extreme ends = 4.482m

mean temperature =23 degree C

Cross- sectional area of the tape 1.7mm squire

Tension applied =25 N

weight of the tape = 3.4N

calculate the corrected horizontal distance of the base line if young's modulus of the tape material is 2*100000N/mm squire AND THE coefficient of thermal expansion of the tape is 1.12*1000000/C degree so/N

A beam AB of length 1 m is supported horizontally at A and B. A weight of 500 N is attached on the rod at C. If the support at A can not bear a pressure more than 300 N, find the distance of C from A, when the support A is about to fail.

A loan company charges 15% simple interest on P500 loan. How much will be repaid if the loan is paid back in one lump sum after 3 years?

 If you borrowed money from your friend with simple interest of 12%, find the present worth of P50,000 which is due at the end of 7 months.