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In Larry Niven's science-fiction novel Ringworld, a rigid ring of material rotates about a star. The inhabitants of this ring world live on the starlit inner surface of the ring (where it is always noon). The tangential speed of the ring is 1.15x106 m/s, its radius is 1.6x1011 m, and the star has a mass of 2.1x1032 kg.
What is the length of a year on this planet?Earth days (i.e., 24-hour periods)
What is the apparent weight of an inhabitant of Ringworld relative to his weight on Earth?(apparent weight/Earth weight)
What would this ratio be for the same inhabitant if there were no star in the center?(apparent weight/Earth weight)
A circuit contains six 240 ohm lamps with 60 W bulbs and a 10 ohm heater connected in parallel. the voltage across the circuit is 120 V. If the circuit has a fuse rated at 12 A, would it melt if everything is on.
Two point charges are placed along a horizontal axis with the following values and positions: +1 µC at x = 0 cm, At what point (the coordinate) along the x axis is the electric field zero
define what is the unknown capacitance. what focal length eyepiece should she use.
A charge of 0.43 C is spread uniformly throughout a 36 cm rod of radius 7 mm. What are the volume and linear charge densities?
Assume the masses described in the preceding problem are 1kg and 100kg in that order. Compare the accelerations while they are interchanged.
A 5.00 mL syringe has an inner diameter of 6.00 mm, a needle inner diameter of 0.210 mm, and a plunger pad diameter (where you place your finger) of 1.2 cm. A nurse uses the syringe to inject medicine into a patient whose blood pressure is 140/100..
Light from a laser beam with a wavelength of 600 nm passes through a narrow single slit and observed on a screen 1.5 m behind the slit. The first minimum of the diffraction pattern is 1.5 cm from the central maximum. How wide is the slit?
A person walks 25.0° north of east for 2.70 km. How far would the person walk due north and due east to arrive at the similar location.
Biometric measurements indicate that each hand typically makes up about 1.25% of body weight. What horizontal force should her wrist exert on her hand.
A 44.0 kg child is in a swing that is attached to ropes 1.60 m long. The acceleration of gravity is 9.81 m/s2. Find the gravitational potential energy associated with the child relative to the child's lowest position under the following conditions.
A brick has a mass of 1.10 kg. What is the brick's weight at the surface of the Earth? A bucket of water weighs 48.2 N. What is the mass of the bucket and water?
Lonnie pitches a baseball of mass .20 kg. The ball arrives at home plate with a speed of 40 m/s and is batted straight back to Lonnie with a return speed of 60-m/s. If the bat is in contact with the ball for .050 s, what is the impulse experienced..
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