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One of Yuchong's childhood dreams is to travel to the Andromeda Galaxy. While abducted by the aliens, Yuchong asked the captain to take him to the Andromeda Galaxy within 50 years (before Yuchong gets too old). How fast does the ship have to travel relative to the earth, in order to realize Yuchong's dream? Express your speed as fractions of the speed of light. Count how many 9's are in your answer before the first number that is not a 9.
A sphere of radius 1.0 cm is dropped into a glass cylinder filledwith a viscous liquid. The mass of the sphere is 12.0 g and thedensity of the liquid is 1200 kg/m3. The sphere reaches a terminalspeed of 0.15 m/s. What is the viscosity of the liquid?
Three point charges have equal magnitudes, two being positive and one negative. Calculate the magnitude of the net force
nichrome wire of cross-sectional radius 0.786 mm is to be used in winding a heating coil. if the coil must carry a
the forces acting on the arm of a person lifting a dumbbell. the force f is the force puling on the hand due to the
A point on a rotating turntable 15.0 centimeter from the center accelerates from rest to 0.700 m/s in 1.75 second. Obtain the magnitude of the centripetal acceleration of the point
Two conductors having net charges of +16.0 µC and -16.0 µC have a potential difference of 16.0 V between them. (a) Determine the capacitance of the system.
After the collision, Car B moves to the left at 6.26 m/s. Find the velocity of Car A after the collision. Then, verify your answer by calculating the total kinetic energy before and after the collision.
Two resistances, one 62 and the other 88, are connected in Parallel. The resistors are then connected to a 12-V battery. Draw the circuit. What is the current during each resistor? What is the equivalent resistance of the parallel combination?
A 35.0-kg boy, riding a 2.50-kg skateboard at a velocity of +5.30 m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boy's velocity relative to the sidewalk is 6.00 m/s, 7.30° above the h..
When you push a 1.95kg book resting on a tabletop it takes 2.50N to start the book sliding. Once it is sliding, though, it takes only 1.50N to keep the book moving with constant speed. What are the coefficients of static and kinetic friction betwe..
When scuba diving, you must equalize the pressure inside your body with the water outside every few meters you dive downward or swim upwards in order to avoid serious health complications. Calculate how far underwater you must dive
In one cycle, a heat engine does 310 J of work and releases 620 J of heat to a lower-temperature reservoir. What is the efficiency of the engine
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