Recent content by herbgriffin

Homework Statement The driver of a car wishing to save the fuel takes his leg off the accelerator when the car is moving at a maximum speed of 80 kmph. Determine the speed of the car after traveling a distance of 100m. The mass of car is 2 tons and the force of friction is 0.6 kN/ ton...

Homework Statement A car of 2 ton mass traveling at 45 kmph approaches a traffic junction. When the car is 100m before the signal, the driver realizes that the green light is about to turn into red in 6 seconds and hence, he accelerates the car uniformly and crosses just before the light turns...

unknown reactance ...how to solve? Homework Statement a circuit with the unknown X (pure reactance) in sereis with a two parallel impedance.Z1= 4-j8 ; Z2= 1+j10 ...and total power factor is 0.707.. find the unknown reactance. Homework Equations p.f. = Rtotal/Ztotal... The Attempt...

Homework Statement A ball is thrown upwards from the top of a building with an initial velocity of 20 m/s and at an angle of 30 (degrees) with the horizontal. The height of the building from the ground level is 25m. Determine (i) where and when it will strike the ground (ii) velocity with...

Homework Statement given input as 100mV peak and expected output to be 10Vpeakto peak...i am having trouble on how to find the different values , like resistors , capacitors ...i am planning to use fixed bias circuit (common emitter configuration) and my transistor gives a value of hfe=...

how can i apply an ac voltage to a certain circuit using an oscilloscope and an ac signal...hopefully you can help me

is this equation correct (1600-arcos x...)/(P1+P2) = tan (arcos 0.90) how will i find x when there is arcos...please help... i am really confuse...thank you for your time sir...

how can i find the reactive power of the synchronous motors when there is no given phase angle...will i use arccosine of x to find x?...

Homework Statement A non inductive resistor takes 8A at 100 volts. What inductance of a coil of negligible resistance must be connected in series in order that this load can be supplied from a 220 volt 60 Hz mains. Homework Equations Z^2 = R^2 + XL^2 R=V/I XL = 2pi(frequency)...

Homework Statement An induction motor load of 2000 kVA has power factor 0.80 lagging. Synchronous motors totaling 500 kVA are added an operated at a leading power factor. If the overall power factor is then 0.90 lagging, what is the power factor of the synchronous motors? Homework...

Homework Statement A cyclist moving at a constant speed of 1m/s realizes that he will be late to the post office by 30 seconds. Hence, he accelerates at a constant rate of 0.3m/second square so that he reaches just in time. Determine the time taken and the distance traveled. Homework...

x=15+[(1/2) (0.5)t^2] train A x= 20+[(1/2) (0.6) t^2] train B please correct me if i am wrong i am really confused

i will get train a will be 225 m at t=30s while train b is 333.33 m at t=33.33s. I don't know if this is right...

Homework Statement Two trains start at the same time from stations A and B (6km apart ) respectively in opposite tracks. train A accelerates uniformly at the rate of 0.5 meter per second square until it reaches a speed of 54 kmph, while train B accelerates uniformly at the rate of 0.6 meter...

Homework Statement A car starts from rest and accelerates uniformly at the rate of 1m/second square to reach a maximum speed of 60kmph. It then travels at this speed for some time and finally decelerates at a uniform rate of 0.5 m/second square to come to rest. If the total distance traveled...