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Question: Part A: How much time does it take light to travel from the moon to the earth, a distance of 384000 km ? Express your answer in seconds to three significant figures.
Part B: Light from the star Sirius takes 8.61 years to reach the earth. What is the distance to Sirius in kilometers? Express your answer in kilometers to three significant figures.
A lightning bolt consisting of electrons moves from the cloudto the ground near the equator. What is the magneticfield due to the bolt 100 m from bolt
A 0.170 kg toy is undergoing SHM on the end of ahorizontal spring with force constant k=390 N/m. What is the total energy of the object at any point of its motion
at what speed must an object be moving in order that it haskinetic energy 1.50 times its rest energy
Justin moves a desk 4.80m across a level floor by pushing on it with a constanst horizontal force of 340N. find the change on the desks gravitional potential energy
the speed of light in a certain material is measured to be 2.2*10^8 m/s. what is the index of refraction of this material
The average intensity of sunlight at the top of the earth's atmosphere is 1385 W/m2. What is the maximum energy
The dielectric in a capacitor is changed to a material with a dielectric constant that is larger by a factor of two. by what factor does the energy stored in the capacitor change
A 75-kg piece of metal has specific heat 430 J/kg°C and is initially at 950°C. To cool it down, it is dunked into 710 kg of oil that has a temperature of 32°C and specific heat of 2700 J/kg°C. Assuming that heat flows only between the oil and the m..
A bullet is moving at a speed of 410 m/s when it embeds into a lump of moist clay. The bullet penetrates for a distance of 0.0721 m. Determine the acceleration of th ebullet while moving into the clay.
The scale of a spring balance reading from zero to 180 N is7.00 cm long. A fish suspended from thebalance is observed to oscillate vertically at 2.50 Hz. What is the mass of the fish? Neglect themass of the spring.
Sheena can row a boat at 3.10 mi/h in still water. She needs to cross a river that is 1.11 mi wide with a current flowing at 1.77 mi/h. Not having her calculator ready, How long does it take her to cross the river
suppose that sound is emitted uniformly in all directions by a public address system. the intensity at a location 26 m
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