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Calculate the resultant velocity of an airplane that normallyflies at 200 km/hr if it encounters a 50 km/hr tailwind. If itencounters a 50 km/hr head wind.
consider an object which is rolling without slipping at constant speed on a level floor.a neglecting air resistance
A cart is driven by a large propeller or fan, which can accelerateor decelerate the cart. The cart starts out at the positionx = 0 m, with an initial velocity of +5.5 m/s and aconstant acceleration due to the fan. The direction to the right ispositiv..
A uniform board is leaning against a smooth vertical wall. The board is at an angle above the horizontal ground. Find the smallest value for the angle , such that the lower end of the board does not slide along the ground
Technetium-99 has an excited state that decays by emission of a gamma ray. The half-life o fthe excited state is 360 min. What is the activity, in curies, of 1.00mg of the excited isotope
An alert physics student stands beside the tracks as a train rolls slowly past. He notes that the frequency of the train whistle is 445 Hz when the train is approaching him and 418 Hz when the train is receding from him. Using these frequencies, h..
A 55 kg person is skiing down a 30 degree slope. The coefficient of friction with the snow is .05. Calculate the final velocity of the skier
an iron boiler of mass 230 kg contains 900 kg of water at 23degc. a heater supplies energy at the rate of 51500 kjh.how
a clay vase on a potters wheel experiences an angular acceleration of 7.62 rads2 due to the application of a 18.4-n m
the starter motor of a car engine draws an electric current of 20.0 a from the battery. the copper wire to the motor is
the cross sectional areas of the pistons in the system have a ratio of 25 to 1. If the maximum force that can be applied to the small piston is 12 N, what is the maximum weight that can be lifted?
You have four 'point' masses, each having a mass of 3.0 kg. They are at the coordinates (2,3)m, (-2,5)m, (7,0)m, (0.4, -5)m. Where is the center of mass
A lamp that plugs into a 120V wall socket can use either a 60W or 100W bulb. Which bulb has the higher resistance
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