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During a snowball fight, your opponent distracts you by throwing one at a high arc. She throws it with speed 25.5 m/s at an angle of 70 degreees. Then, she throws a second at a lower angle of 20 degrees.
If the second snow ball is going to hit you first, how soon after the first snowball is thrown must the second be thrown? In other words, what is the delay between the two throws that will have both arriving at the same time?
Four identical charges (+2.9 µC each) are brought from infinity and fixed to a straight line. The charges are located 0.59 m apart. Decide the electric potential energy of this group.
A 220 g top spinning at 14 rev/s makes an angle of 30° to the vertical and precesses at a rate of 1 rev per 8.0 s. what is the moment of inertia of the top
A scuba tank has a volume of cm2. For every deep dives, the tank is filled with (by volume) pure oxygen and 50% pure helium. What is the ratio of the rms speeds of the two types of molecules
A block whose mass m is 680 kg is fastened to a spring whose spring constant k is 65 N/m. What is the phase constant for this motion
A long, straight wire runs along the y-axis. The wire carries a current in the positive y-direction that is changing as a function of time according to i = 8 A + (0.2 A/s)t. A loop of wire is placed in the xy-plane near the y-axis. The loop has di..
A cube of metal has a mass of 0.347 kg and measures 3.13 cm on a side. Calculate the density and identify the metal
Physics and Chemistry Found in Vital Signs of Planet Earth
A cart loaded with bricks has a total mass of 21.2 kg and is pulled at constant speed by a rope. The rope is inclined at 27.2 ? above the horizontal and the cart moves 27.1 m on a horizontal floor. The coefficient of kinetic friction between groun..
A banked circular highway curve is designed for traffic moving at 75 km/h. The radius of the curve is 153 meter. Find minimum coefficient of friction between tires and road
A 70-? electrical appliance and a 110-? electrical appliance are plugged into the outlets of a house. By what factor will the power used change if an additional 140-? electrical device is plugged in?
A load of bricks is being lifted by a crane at the steady velocity of Vo (= 5 m/s) when one brick falls of H (= 5m) above the ground. What is the greatest height above the ground that the brick reaches
In a standing wave pattern the distance between the second and the seventh nodes is 5cm. find the wavelength and the speed of the wave
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