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Twin A makes a round trip at 0.6c to a star 12 light-years away, while twin B stays on the earth. Each twin sends the other a signal once a year by his own reckoning.
(a) How many signals does A send during the trip? How many does B send?
(b) How many signals does A receive? How many does B receive?
A 2.6-m segment of straight wire feels a force of 8.6 N when the wire carries a current of 9.6 A in a region with a constant magnetic field of 4.9 T. What is the angle between the wire and the magnetic field
A 75 kg man weighs 735 N on the Earth's surface. How far above the surface of the Earth would he have to go to "lose"12% of his body weight
Describe two different energy alternatives to fossil fuels in detail. Discuss how they work, how they compare with fossil fuels, and their relative advantages and disadvantages.
A stationary spherical conductor with a radius of 2.00 cm has a potential of -257 V on the surface. What is the impact speed of the proton
ocean waves with wavelength 1.2 m and period 1.5s are moving past a pier. a boy runs along the pier, how many wave crests pass the boy each second
Starting from rest, a solid sphere begins to spin reaching its angular speed of 3.17 rad/s after 0.300 seconds. What was its angular acceleration during this process?
an inductor of 219 mh with a resistance of 6 o is connected to a power supply with a maximum voltage of 219 v and a
Find the mass flow rate in through the vent in question #1 using the following well-known relationship for the mass flow into an opening:
You were stranded on a desert island with John, who wears glasses. He manages to start a fire. Is John nearsighted or farsighted? Explain how you know. Explain what nearsighted and farsighted mean, and how glasses correct the condition.
A 180 ib soldier had an accident: He fell down from a helicopterhoverin at 150 ft above a sno packed ground. evaluate the direction of this net acceleration
A horizontal rifle is fired at a bull's-eye. The muzzle speed of the bullet is 655 m/s. What is the horizontal distance between the end of the rifle and the bull's-eye
A magnetic field is perpendicular to the plane of a single-turn circular coil. The magnitude of the field is changing, What current is induced in the square coil
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