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A train moving at a constant speed of 58.0 km/h moves east for 46.0 min, then in a direction 57.0° east of due north for 14.0 min, and then west for 71.0 min. What is the average velocity of the train during this run? What is the magnitude in km/h and direction in degrees (counterclockwise from east)?
An orchid grower hears that the temperature is expected to fall below freezing overnight, so she puts a large barrel in her orchid greenhouse, How much heat left the water during the night
Under some circumstances, a star can collapse into an extremely dense object made mostly of neutrons and called a neutron star. If the original star rotated once in 34 days, find the angular speed of the neutron star
The track is 10.00 cm wide, 5.00 m long, and 2.78 m high, and is solid. The runway is cut such that it forms a parabola by the equation y = (x - 5)2 / 9
A 225 kg projectile, fired with a speed of 109 m/s at a 66.0 angle, breaks into three pieces of equal mass at the highest point of its arc (where its velocity is horizontal). Determine the energy released in the explosion
A typical American family uses 1120 kWh of electricity a month. On average, what is the resistance of a household
two sheets of aluminum foil have a separation of 1.20mm a capacitance of 9.7pF and are charged to 13.0v, the separation is now decreased by 0.10mm with the charge held constant. Find the new capacitance
The angular momentum of a flywheel having a rotational inertia of 0.242 kg·m2 about its central axis decreases from 9.30 to 0.230 kg·m2/s in 4.40 s. What is the magnitude of the average torque acting on the flywheel about its central axis during th..
A uniform thin rod of mass 4.19 kg pivots about an axis through its center and perpendicular to its length. What must the length of the rod be so that the moment of inertia of the three-body system with respect to the described axis is 0.977 kg·m2
An unstrained horizontal spring has a length of 0.34 m and a spring constant of 290 N/m. Two small charged objects are attached to this spring, one at each end. The charges on the objects have equal magnitudes.
Water is moving at a velocity of 1.50 m/s through a hose with an internal diameter of 1.60 cm. What is the flow rate in liters per second
A 3.08 kg block starts from rest at the top of a 30° incline and accelerates uniformly down the incline, moving 2.13 m in 1.60 s. Find the magnitude of the frictional force acting on the block
The radioactive hydrogen isotope 3H is calledtritium. It has beta-minus decay and a daughter necleus of 3He. What is the time constant for tritium
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