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Olympic champion swimmer Michael Phelps swam at an average speed of 2.01 m/s during the first half of the time needed to complete a race.
What was his average swimming speed during the second half of the race if he tied the record, which was at an average speed of 2.05 m/s
A 8cm radius disk with a rotational inertia of .12kgm^2 is free to rotate on a horizontal axis. A string is fastened to the surface of the disk and a 10kg mass hangs from the other end. The mass is raised by using a crank to apply a 9Nm torque to the..
A 1500 kg blue car was travelling at 90 km/h. A 1200 kg red car was traveling behind the blue car at 108 km/h.when the two cars were 55 m apart, the blue car began braking.it took the driver of the red car 0.50 s to start braking her car. If the ..
A satellite moves in a circular earth orbit that has a radius of 9.73 x 106 m. A model airplane is flying on a 13.7-m guideline in a horizontal circle. Find the speed of the plane such that the plane and the satellite have the same centripetal acce..
A mass is suspended from the ceiling of a train car by a 45.4cm long piece of string. A passenger notices that the mass is deflected 14.7cm backward as the train accelerates forward. What is the train's acceleration?
A 3700 Ω resistor and a 1.2 µF capacitor are connected in series across a generator (60.0 Hertz, 120 Volt rms). Compute the average power delivered to the circuit
two forces act on a 55 kg object. one force has magnitude 65 n directed 59deg clockwise from the positive x-axis and
the electrons in a beam are moving at 2.6 times108 ms in an electric field of 16000 nc. what value must the magnetic
A powerful bolt of lightning can carry a current of 225 kA. find the magnitude of the magnetic field produced by such a bolt of lightning at a distance of 93 meter
An airplane flies 200 km due west from city A to city B and then 280 km in the direction of 24.5° north of west from city B to city C. how far is city C from city A
A spaceship moving toward Earth with a speed of 0.91c launches a probe in the forward direction with a speed of 0.10c relative to the ship. Find the speed of the probe relative to Earth.
the shear modulus of steel is 8.1x10^10N/m^2. a steel nail of radius 7.5x10^-4m projects 0.040m horizontally outward from thw wall. what is the vertical deflection of the other end of the nail
Gold, which has a density of 19.32 g/cm3, is the most ductile metal and can be pressed into a thin leaf or drawn out into a long fiber. (a) If a sample of gold by a mass of 3.245 g, is pressed into a leaf of 3.989 m thickness, what is the area of the..
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