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Q. A 75 light bulb is designed to operate with an applied ac voltage of 120 V rms. The bulb is placed in series with an inductor L, and this series combination is then connected to the 60 Hz 240 V voltage source. For bulb to operate properly, determine the necessary value for L. Assume the bulb has resistance R and negligible inductance.
Q. The scale of a spring balance reading from 0 to 235rm {N} has a length of 15 rm{cm}. A fish hanging from the bottom of the spring oscillates vertically at a frequency of 2.7rm {Hz}. What is the mass of fish? In Kg.
A baseball is hit with a speed of 30ms-1 at an angle of 40degrees. It land`s on the flat roof of a nearby building with a height of 14 m. If the ball was hit when it was 1.40 m above the ground, what horizontal distance does it travel before it la..
A certain star is 14 million light-years from Earth. The intensity of the light that reaches Earth from the star is 4.00 x 10-21 W/m2. At what rate does the star radiate EM energy.
A doubly charged helium atom whose mass is 6.6 10 to 27 kg is accelerated by a voltage of 2200 V. What will be its radius of curvature if it moves in the plane perpendicular to a uniform 0.308 T field?
A race car has a mass of 702kg. It starts from rest and travels 42 m in 3 s. The car is uniformly accelerated during the entire time. What net force is exerted on it.
Find out that the value of the gravitational field strength
What is the velocity of the rocket when it runs out of fuel.
What was the displacement of the spring. An elevator and its load have a combined mass of 1400 kg. Find out the tension in the supporting cable when the elevator, originally moving downward at 12 m/s, is brought to rest with constant acceleration i..
Find the current that flows if the same potential difference. A 63 kg trampoline artist jumps vertically upward from the top of a platform with the speed of 4.8 m/s. If the trampoline behaves like a spring of spring constant 6.2×10^4 N/m, how far ..
Two simple pendulums have length of 81-cm and 64-cm they are released from the same angular position at the same instant. After how much time would they both arrive at their initial position simultaneously.
What is the childs total mechanical energy. If the speed of the child at the lowest position is 2.00 m/s, what is the change in mechanical energy due to friction.
A person desires to reach a point that is 3.40 km from her present location and in a direction that is 350 north of east. However, she must travel along streets that are oriented either north-south or east-west. What is the minimum distance she mi..
An air parcel moves northwards and becomes entrained in a strong westerly flow, circling the entire globe in the space of a few weeks. State the name given to this high-level flow and define briefly how its structure is related to lateral and vert..
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