Engineering analysis

(1) A current source of value 2cos(2t) A is used to power a string of 2W lightbu

(1) A current source of value 2cos(2t) A is used to power a string of 2W lightbulbs. If you wanted to replace this current source with a DC one, but have the same power drop, what…

(1) A flowerpot (m 10 kg) hangs from three wires as shown. Compute the tension i

(1) A flowerpot (m 10 kg) hangs from three wires as shown. Compute the tension in each wire. (Hint: To find T3, draw a free-body diagram for the flowerpot itself. To find T1 and 1…

(1) A guitar string of length L = 60 cm and mass 1.2 g is tuned to produce the n

(1) A guitar string of length L = 60 cm and mass 1.2 g is tuned to produce the note B3 (frequency f1 = 245 Hz) when vibrating in its fundamental mode (a) Find the string tension a…

(1) A high-speed railway car goes around a flat, horizontal circle of radius 400

(1) A high-speed railway car goes around a flat, horizontal circle of radius 400 m at a constant speed. The magnitudes of the horizontal and vertical components of the force of th…

(1) A house has a heat pump with a COP = 2.1. If it requires 2,056 kW · hr of en

(1) A house has a heat pump with a COP = 2.1. If it requires 2,056 kW·hr of energy each month to operate, how much heat is delivered to the house in kW·hr within that month? (ANS:…

(1) A long cylindrical shell carries a uniform charge density. If there is +0.10

(1) A long cylindrical shell carries a uniform charge density. If there is +0.100 C per meter, what is the volume charge density of this cylinder with an inner radius of 5 cm, and…

(1) A mass m 1 = 8 kg is at rest on a frictionless horizontal surface and connec

(1) A mass m1 = 8 kg is at rest on a frictionless horizontal surface and connected to a wall by a spring with spring constant k = 70 N/m as shown in the figure. A second mass m2 =…

(1) A mass m 1 = 8 kg is at rest on a frictionless horizontal surface and connec

(1) A mass m1 = 8 kg is at rest on a frictionless horizontal surface and connected to a wall by a spring with spring constant k = 70 N/m as shown in the figure. A second mass m2 =…

(1) A mass of m =120 g of aluminum is formed into a wire of diameter d = 1.0 mm.

(1) A mass of m =120 g of aluminum is formed into a wire of diameter d = 1.0 mm.Aluminum has a mass density of D =2700 kg/m3 and a resistivity of =2.80 * 10–8 m.A battery is used …

(1) A proton moves in the positive x direction through a uniform magnetic field

(1) A proton moves in the positive x direction through a uniform magnetic field in the positive y direction. What is the direction of the magnetic force on the proton? Explain you…

(1) A pump storage system generates electricity by draining water from an upper

(1) A pump storage system generates electricity by draining water from an upper lake to a lower one when electricity is expensive and then pumping the water back up at a time when…

(1) A spherical balloon is initially uncharged. If you spray positive charge uni

(1) A spherical balloon is initially uncharged. If you spray positive charge uniformly over the balloon’s surface, would it expand or contract? What would happen if you spread neg…

(1) A transformer is designed to step 230 V European power down to 120 V needed

(1) A transformer is designed to step 230 V European power down to 120 V needed to operate North American devices. (a) If the primary has 800 turns, how many should the secondary …

(1) A transformer is used to operate a model train. The transformer, which is pl

(1) A transformer is used to operate a model train. The transformer, which is plugged into a standard electrical outlet, produces an output voltage of 13.3 V (rms), applied to the…

(1) A wave on a string under tension T=4.1 N whose total mass is 4 gms and lengt

(1) A wave on a string under tension T=4.1 N whose total mass is 4 gms and length is 3 m is described by y(x,t) = 15 sin (kx – 4p t) where x and y are in centimeters and t is in s…

(1) All the holes have samediameter of your choice, i.e., d n = d for n = 1 to10

(1) All the holes have samediameter of your choice, i.e., dn = dfor n = 1 to10, please make a plot of water jet heightH and jet volume flow rate Q as a function ofhole#, i.e., H=H…

(1) Although most natural potassium nuclei are stable 39 K (93.3%) or 41 K (6.7%

(1) Although most natural potassium nuclei are stable 39K (93.3%) or 41K (6.7%) nuclei, about 0.0117% are radioactive 40K nuclei, which have a half-life of 1.26 billion years. Wha…

(1) Aluminium alloys can be made stronger through heat- treatment or cold workin

(1) Aluminium alloys can be made stronger through heat- treatment or cold working. Critically discuss the properties of these alloys that make them suitable for applications in ma…

(1) An agitator truck transported ready mixed concrete to the jobsite. Due to de

(1) An agitator truck transported ready mixed concrete to the jobsite. Due to delays on the way it took almost one hour to deliver concrete. During that time, the agitator truck d…

(1) An asteroid is moving along a straight line. A force acts along the displace

(1) An asteroid is moving along a straight line. A force acts along the displacement of the asteroid and slows it down. The asteroid has a mass of 3.2 × 104 kg, and the force caus…

(1) An ideal transformer has 50 turns in its primary coil and 250 turns in its s

(1) An ideal transformer has 50 turns in its primary coil and 250 turns in its secondary coil. 12 V is connected to the primary. a. Find the voltage across the secondary coil. b. …

(1) An insulated piston-cylinder device initially contains 8.573 kg of air at 20

(1) An insulated piston-cylinder device initially contains 8.573 kg of air at 20 psia and 60ºF. Then 1000 Btu per lb of air of heat is added to the system while the pressure remai…

(1) Answer the following questions (it could be short answers): a) Briefly descr

(1) Answer the following questions (it could be short answers): a) Briefly describe what is meant by “breaking” of an asphalt emulsion? b) Why is short-term oven aging important i…

(1) Are Distributed Generators(DGs) placed on transmission network for improved

(1) Are Distributed Generators(DGs) placed on transmission network for improved reliability? if yes,explain (2) State 5 objective functions with their mathematical models and cons…

(1) Assume the radius of the earth is 6400 km and gravity at a height of 200 km

(1) Assume the radius of the earth is 6400 km and gravity at a height of 200 km is 9.2 m/s2. A satellite orbits the earth 200 km above the surface. The speed necessary for a circu…

(1) At what height above the earth is the acceleration due to gravity 35.0% of i

(1) At what height above the earth is the acceleration due to gravity 35.0% of its value at the surface? Express your answer with the appropriate units. (2) What is the speed of a…

(1) Autogenous shrinkage of concrete is A. the microscopic volume reduction at a

(1) Autogenous shrinkage of concrete is A. the microscopic volume reduction at an early age; B. also called drying shrinkage; C. facilitated by larger w/c: D. enlarged if 10% of c…

(1) Autogenous shrinkage of concrete is A. the microscopic volume reduction at a

(1) Autogenous shrinkage of concrete is A. the microscopic volume reduction at an early age; B. also called drying shrinkage; C. facilitated by larger w/c D. enlarged if 10% of ce…

(1) Autogenous shrinkage of concrete is A. the microscopic volume reduction at a

(1) Autogenous shrinkage of concrete is A. the microscopic volume reduction at an early age; B. also called drying shrinkage; C. facilitated by larger w/c: D. enlarged if 10% of c…

(1) Autogenous shrinkage of concrete is A. the microscopic volume reduction at a

(1) Autogenous shrinkage of concrete is A. the microscopic volume reduction at an early age; B. also called drying shrinkage; C. facilitated by larger w/c D. enlarged if 10% of ce…

(1) Boxcar A boxcar of length 8.7 T72 and height 2.4 T7 is at rest on frictionle

(1) Boxcar A boxcar of length 8.7 T72 and height 2.4 T7 is at rest on frictionless rails. Inside the boxcar (whose mass when empty is 3900 k g) a tank containing 2300 kg of water …

(1) Briefly explain whether the following statements are truc or false. Don\'t w

(1) Briefly explain whether the following statements are truc or false. Don't write a big story Write only the critical points in few sentences. (3 x 4 12 points) (a) Work require…

(1) Consider the rigid wire shown above with current flowingas indicated. There

(1) Consider the rigid wire shown above with current flowingas indicated. There is a uniform mangnetic field perpendicular toteh wire into the paper. Use the right hand rule to de…

(1) Copper has resistivity 1.7 X 10^-8 alpha*m. Compute the resistances associat

(1) Copper has resistivity 1.7 X 10^-8 alpha*m. Compute the resistances associates with uniform wires made from pure copper with the following geometries. a) Length = 5m, Cross-se…

(1) Determine the magnitude of the electric field at a point2.5A from a proton.

(1) Determine the magnitude of the electric field at a point2.5A from a proton. (2) Determine the potential at thispoint. PS: the symbol after 2.5 looks like an "A" with a small c…

(1) During a baseball game a batter hits a popup to a fielder 82meters away. The

(1) During a baseball game a batter hits a popup to a fielder 82meters away. The acceleration of gravity is 9.8 m/s2 .If the ball remains in the air for 5.8 s, how high does it ri…

(1) Electric field lines: There are two uniform electric fields: E1 is in the po

(1) Electric field lines: There are two uniform electric fields: E1 is in the positive x direction with 100 N/C, and E2 is in the positive y direction with 50 N/C. How would you d…

(1) Find the magnitude of the magnetic field at a distance of 1.65 cm from a sin

(1) Find the magnitude of the magnetic field at a distance of 1.65 cm from a single long wire carrying a current of 20.5 A. ______________________________________T (2) For purpose…

(1) Find your mass in kilogram from the relation, m = (weight in lb)/(2.25 lb/kg

(1) Find your mass in kilogram from the relation, m = (weight in lb)/(2.25 lb/kg) =                or your weight in newton from the relation, w = (weight in lb)/(0.225 lb/N) =   …

(1) Heat is convected away from an object at the rate given by the following for

(1) Heat is convected away from an object at the rate given by the following formula: (deltaQ/deltaT) = hA(deltaT). h: coefficient that depends on the shape and the orientation of…

(1) How does the tension acting on m 2 compare with the weight of m 2 ? HINT: Ne

(1) How does the tension acting on m2 compare with the weight of m2? HINT: Newton's 2nd Law! (a) |[(F) ec]T| = m2g (b) Cannot determine unless we know if m1 is greater than, less …

(1) How does the tension acting on m 2 compare with the weight of m 2 ? HINT: Ne

(1) How does the tension acting on m2 compare with the weight of m2? HINT: Newton's 2nd Law! (a) |[(F) ec]T| = m2g (b) Cannot determine unless we know if m1 is greater than, less …

(1) How does the work required to stretch a spring 2 cm compare with the work re

(1) How does the work required to stretch a spring 2 cm compare with the work required to stretch it 1 cm? (2) A cart starting from rest rolls down a hill and at the bottom has a …

(1) How does the work required to stretch a spring 2 cm compare with the work re

(1) How does the work required to stretch a spring 2 cm compare with the work required to stretch it 1 cm? (2) A cart starting from rest rolls down a hill and at the bottom has a …

(1) How does the work required to stretch a spring 2 cm compare with the work re

(1) How does the work required to stretch a spring 2 cm compare with the work required to stretch it 1 cm? (2) A cart starting from rest rolls down a hill and at the bottom has a …

(1) How does the work required to stretch a spring 2 cm compare with the work re

(1) How does the work required to stretch a spring 2 cm compare with the work required to stretch it 1 cm? (2) A cart starting from rest rolls down a hill and at the bottom has a …

(1) I 1 + I 2 - I 3 = 0 (2) Loop abcda :11.3V - (6.0 ? ) I 1 - (2.0 ? ) I 3 = 0

(1)I1+I2-I3= 0 (2) Loopabcda:11.3V - (6.0?)I1- (2.0?)I3= 0 (3) Loopbefcb: -14.3V -11.3V + (6.0?)I1- (4.0?)I2= 0 11.3- 6.0I1- 2.0(I1+I2) = 0 (4)11.3= 8.0I1+ 2.0I2 (5)-12.8= -3.0I1+…

(1) If a capacitor has a capacitance oc 10.2 pF and we wish to lower the potenti

(1) If a capacitor has a capacitance oc 10.2 pF and we wish to lower the potential difference across the plates by 60.0 V, what magnitude of charge will we have to remove from eac…

(1) If a car stops suddenly, you feel \"thrown forward.\" We\'d like to understa

(1) If a car stops suddenly, you feel "thrown forward." We'd like to understand what happens to the passengers as a car stops. Imagine yourself sitting on a very slippery bench in…

(1) If a concrete mixer transport truck (cement mixer) is stuck in a traffic jam

(1) If a concrete mixer transport truck (cement mixer) is stuck in a traffic jam, which of the window o ollowing materials can be used as a setting retarder to prolong the workabl…