Question
If A can complete a job in 15 days and B can complete
the same job in 10 days, and they work together for 4 days before A leaves. How many more days will B take to finish the job alone?Solution
A's work rate = 1/15; B's work rate = 1/10. Combined work rate = 1/15 + 1/10 = (2 + 3) / 30 = 5/30 = 1/6. Work done in 4 days = 4 * (1/6) = 2/3. Remaining work = 1 - 2/3 = 1/3. B's time to finish remaining work = (1/3) / (1/10) = (1/3) * 10 = 10/3 = 3.33 days.
During ______ motion of an object along a straight line, the change in velocity of the object for any time interval is zero.
A metallic conductor of circular cross-section has radius R. If current density varies as J = Jₒ(1−r/R), the total current through the conductor is:...
Charges +q and –q are placed at (–d, 0) and (+d, 0). A third charge Q is placed at (0, x). For what value of x will the force on Q be maximum?
Two capacitors of 6 µF and 3 µF are connected in series and a potential difference of 90 V is applied. The energy stored in the system is:
A train runs along an unbanked circular track of radius of 10 m at speed of 36 km/h. The mass of the train is 16 kg.
What is the an...
The mass of a star is two times the mass of the Sun. How it will come to an end?
A transformer works on which principle?
Focal length of a concave lens with power –2 D:
In an AC circuit, voltage and current are given by V = 200 sin(ωt) and I = 10 sin(ωt + π/3). What is the average power consumed?
The shape of our Milky Way galaxy is
