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An astronaut at rest on Earth has a heartbeat rate of 73 beats/min. When the astronaut is traveling in a spaceship at 0.87c, what will this rate be as measured by the following: (a) an observer also in the ship beats/min (b) an observer at rest on Earth beats/min
A 55-kg skier starts from rest at the top of a ski jump, point A is at the top of the ramp and is 40.6 m above the end of the ramp, Determine the distance (s) to where she strikes the ground.
A hollow sphere of negligible mass and radius R is completely filled with a liquid so that it's density is p. What is the density of the enlarged sphere
what is the electric potential energy of this particle. what is its speed just before it strikes the positive plate.
A capacitor is connected across the terminals of an ac generator that has a frequency of 370 Hz and supplies a voltage of 15 V. When a second capacitor is connected in parallel with the first one, the current from the generator increases by 0.27 A. D..
Water at a pressure of 3.2 atm at street level flows into an office building at a speed of 0.5 m/s through a pipe 5.6 cm in diameter. Calculate the water pressure in such a pipe on the top floor
The current in a 120-V reading lamp is 1.8 A. If the cost of electrical energy is $0.070 per kilowatt-hour, how much does it cost to operate the light for an hour
A plane flies 338 km at an angle of 22.3 degrees north of east. find the displacement the plane must now take to reach the airport
Determine the magnitude of the force between two point charges, Q1 = -2e located at (-3.60 cm, +4.10 cm) and Q2 = -8e located at (-0.60 cm, -8.60 cm). Continue working the problem above by calculating the direction of the force that Q1 exerts on Q..
an object is 18cm in front of a adiverging lens that has a focal length of -12cm. how far in front of the lens should the object be placed
Why is it better for some purposes to use a medium size telescope on a mountain instead of a telescope in space?
The maximum torque experienced by a coil in a 0.80 T magnetic field is 8.4 10-4 N · m. What is the length of the wire from which the coil is made
Magnus has reached the finals of a strength competition. In the first round, he has to pull a city bus as far as he can. how much work does the tension force do on Magnus
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