If electricity costs 9A^/kWh, how much does it cost to burn a 95 W bulb for one
ID: 1633895 • Letter: I
Question
If electricity costs 9A^/kWh, how much does it cost to burn a 95 W bulb for one day? A^A 1300 W heater for a sauna requires 40 min to heat the sauna to 190 degree F. What does this cost if electricity sells for 8A^/kwh? A^A Foucault pendulum with a length of7.5m has a period of 5.4 s. What is its frequency? HZ A spring hanging from the ceiling has an unstretched length of 80 cm. A mass is then suspended at rest from the spring causing its length to increase to 89 cm. The mass is pulled down an additional 9 cm and released. What is the amplitude of the resulting oscillation? cm What is the period of a 0.35 kg mass suspended from a spring with a spring constant of 34 N/m? s A boy with a mass of 50 kg is hanging from a spring with a spring constant of190 N/m. With what frequency does the boy bounce up and down? HZ A pendulum has a length of 30 m. What is its period? s A girl with a mass of 40 kg is swinging from a rope with a length of 2.4 m. What is the frequency of her swinging? HZ A 5 mC charge experiences a force of 14 N directed east. What is the electric field (magnitude and direction) at the location of the charge? N/C Direction Find the force (magnitude and direction) on a -20 mC charge that replaces the 5 mC charge. N DirectionExplanation / Answer
5. answer is electric field
electric field can acclerate an electron but not change its speed . to satisfying this condition the electron must move in a circular path with constant speed ,but as direction changes continuously so their is accleration present
6 . answer is D,
because voltage can be induced in the wire if lines of force or flux density of field through the close loop wire changes . and this can be done by any of the above option A, B and C
7. an electric motor is very similar to the electric generator . their working principle is similar and only different is their input and out put
Answer is A
9. Disregarding the effect of friction , a cyclist will coast further when a lamp is power by a wheel generator is of high wattage
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