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Q. Two circuits contain an emf produced by a moving metal rod, like that shown. The speed of the rod is the same in each circuit, but the bulb in circuit 1 has one-half the resistance of the bulb in circuit 2. The circuits are otherwise identical. The resistance of the light bulb in circuit 1 is 47 Ω, and that in circuit 2 is 94 Ω. Determine (a) the ratio ε1/ε2 of the emfs and (b) the ratio I1/I2 of the currents in the circuits. (c) If the speed of the rod in circuit 1 were twice that in circuit 2, what would be the ratio P1/P2 of the powers in the circuits?
A stand, string, a paper or plastic cup, a nail, a roll of paper towels or similar sized paper, coloured sand, or some other dry powdery product, and a ruler or measuring tape.
You're carrying a 4 m long, 23 poles to a construction site when you decide to stop for a rest. You place one end of the pole on a fence post and hold other end of the pole 35 from its tip. How much force should you exert to keep the pole motionle..
A patients blood pressure is measured as 140 / 80, measured in level with the heart. What would you expect the blood pressure to be at the top of the head if there is a 45cm height difference in the two points. Density of blood is 100kmm-3. Give r..
A person exerts a horizontal force of F = 175 N in the test apparatus shown in the drawing. (h = 0.25 m.) Find the horizontal force M that his flexor muscle exerts on his forearm.
The stairs are 83 long and inclined at the angle of 31. If a player has a mass of 87, estimate his average power output on the way up. Overlook friction and air resistance.
A 100 block on a frictionless table is firmly attached to one end of a spring with = 27 . The other end of the spring is anchored to the wall. A 22 ball is thrown horizontally toward block with a speed of 5.5.
Find out the speed of the satellite
n object of mass "m" specific heat "Cp" & surface area "As" is initially at a temperature "To". Rate of Heat gained by Object = Rate of Heat Lost by Gas m, Cp, h, A & Tg are all constants.
Batteries are rated in terms of ampere-hours (A h). For example, a battery that can produce the current of 3.00 A for 5.00 h is rated at 15.00 A h. What is the total energy stored in an 8.0-V battery rated at 49.0 A h.
Assume a small child rolls off a bed that is 0.38m above the floor. If the floor is hardwood, the child's head is brought to rest in approximately 2.2mm. If the floor is carpeted, this stopping distance is increased to about 1.1cm.
A car travelling at 25.0 m/s runs out of gas while travelling up a 33.0 degree slope. How far up the hill would it coast before starting to roll back down.
What is wave speed
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