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If the amplitude of the electric part So of a plane wave in vacuum is 30volts/m,what will be the amplitude of the associated magnetic part Ho. Calculate the average energy flow of the electromagnetic wave in watt/m^2(7.96×10^-2T,1.2w/m^2)
What is the units for momentum
A block with mass m is attached to a ceiling by a spring with spring constant k and relaxed length . Initially, the spring is compressed to a length of l / 2 . If the block is released, at what distance below the ceiling will the block be brought to rest (instantaneously, at the lowest point) by the spring?
A bar of silver absorbs 1.23 kJ of energy by heat which causes its temperature to rise by 10.0°C. Calculate the specific heat of the silver bar if its mass is 525 g.
A vinta is moving up and down periodically, due to waves on the surface of the water. It takes 3.0s for the vinta to travel from its highest to its lowest point, a total distance of 0.70 m. The fisherman on the vinta sees that the wave troughs are spaced 6.0 m apart.
(a) How fast are the waves traveling?
(b) What is the amplitude of each wave?
A solid gold vase of mass 20.0 kg is suspended by a rope at sea bottom. What is the Buoyant Force of the seawater on the vase?
1.Mars has an orbital radius of 1.524 AU. Using Kepler’s constant of 1a2/Au3 you can determine it’s orbital period is ___ years. (Give your answer with 4 sig digs and do not include units).
2.Neptune has 3 moons, Proteus, Triton and Nereid. Proteus has an orbital radius of 117600 km and an orbital period of 1.12 days. Triton has an orbital radius of 354800 km. The orbital period of Triton is ___days. (Give your answer with the correct number of sig digs and do not include units)
3.The earth’s orbital radius is 1.49x1011m and its period of revolution around the sun is 1.00 years. If Mercury has an orbital radius around the sun of 5.79x1010m, its period of revolution is _____years. (Give your answer with the correct number of sig digs and do not include units).
4.The earth’s orbital radius is 1.49x1011m and its period of revolution around the sun is 1.00 years. If Venus has an orbital period of 224.7 days its orbital radius is _____x1011m.
A 2.5 kg object is whirled in a vertical circle whose radius is 0.89 m. If the time of one revolution is 0.94 s, the magnitude of the tension in the string (assuming uniform speed) when it is at the bottom is ___x102N. (Give your answer with 2 sig digs, and do not include units)
1.A student is riding their bmx bike on a track that forms a vertical circular loop with a diameter of 6.0m. In order to reach the top of the loop and not fall, the student would have to be travelling at a speed of ___m/s. (Give your answer with the correct number of significant digits and do no include units).
2.A student has a weight of 650 N. While riding on a roller-coaster this same student has an apparent weight of 1.97 x 103 N at the bottom of a loop that has a radius of 17.0 m. The speed of the roller-coaster is ____m/s. (Give your answer with 3 sig digs and do not include units).
3.A string requires a 191.0 N force in order to break. A 1.75 kg mass is tied to this string and whirled in a vertical circle with a radius of 1.92 m. The maximum speed that this mass can be whirled without breaking the string is ___m/s. (Give your answer with 3 sig digs, and do not include units)
#332078 on Oct 2022