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If a galaxy contains a type I (classic) Cepheid with aperiod of 30 days and an aparent magnitude of 20, what is the distance to the galaxy?
A boxer receives a horizontal blow to the head that topples him over. The force, of magnitude 1.06 x 10^3 N, is applied for 1.1 x 10^-2 s at a point 1.82 m above the floor. Find the boxer's final angular velocity
A 3.1-cm-tall object is 47 cm in front of a converging lens that has a 11.8 cm focal length. Calculate the image position and height
A 0.75 H inductor is in series with a fluorescent lamp, and the series combination is across the 120 V rms, 60 Hz power line. Calculate the resistance of the lamp
Two point charges are fixed on the y axis: a negative point charge q1 = -26 µC at y1 = +0.20 m and a positive point charge q2 at y2 = +0.38 m, Determine the magnitude of q2
The body contains many small currents caused by the motion of ions in the organs and cells. how large is the current in the heart
An escalator moves 10 people (60 kg each) per minute from the first floor of a store to the second floor, 5 m above. what is the average power required
A football player who weighs 85 kg is carrying the ball directly up field at a rate of 15 km/hr. What is the initial momentum of the offensive player
The angular velocity of a flywheel obeys the equation , where is in seconds and and are constants having numerical values 2.45 (for ) and 1.60 (for ). Part D What is the angular acceleration of the wheel at = 2.50 ? Part E Through what angle does ..
Your little sister (mass 25.0 kg) is sitting in her little red wagon (mass 8.65kg ) at rest. You begin pulling her forward, Calculate the impulse you imparted to the wagon and its passenger
A uniform, solid metal disk of mass 6.10 and diameter 29.0 hangs in a horizontal plane, supported at its center by a vertical metal wire. What is the period of the torsional oscillations of the disk
90 grams of water at 80°C are mixed with an equal amount of water at 20°C in a completely insulated container. The final temperature of the water is 50°C. How much heat is lost by the hot water
A 2.40kg mass is pushed against a horizontal spring of force constant 26.0N/cm on a frictionless air table. The spring is attached to the tabletop, Find the greatest speed the mass reaches
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