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Q. Rosie (mass 47 kg) pushes a box with a horizontal force of 150 N (33.72 lb) at a speed of 16 m/min. What is Rosie's power output? Answer in units of W.
Q. A long, straight wire carries a current of 44 A. The magnetic field produced by this current at a certain point is 8.0 x10-5 T. How far is the point from the wire?
An object is oscilliating on a spring with a period of 4.60 s . At time t= 0.00 s the object has zero speed and is at x = 8.30 cm . What is the acceleration of the object at t= 2.50 s ?
Yellow light that has a wavelength of 6.32 x10^2 nm passes through two narrow slits that are 0.201 mm apart. An interference pattern is produced on a screen 183 cm away. What is the location of the first-order image.
Three single-phase step-up transformers rated at 10MVA, 4.6kV/13.8kV are connected in Wye-Delta configuration. The three transformers are used to feed a 20MVA load at 0.9 p.f. With an efficiency of 96%. Find the secondary line voltage.
An atomic nucleus of mass 288 u moving at 405m/s emits an alpha particle of mass 4.0 u in the direction of its velocity. If the remaining nucleus slows to 360m/s, what velocity does the alpha particle have when it is emitted.
A 75 , 33 long rod hangs vertically on a frictionless, horizontal axle passing by its center. A 12 ball of clay traveling horizontally at 2.6 hits and sticks to the very bottom tip of the rod.
Suppose the speed of light in a vacuum were only 25.5 mi/h. Find the length of the bicycle being ridden at a speed of 20.0 mi/h as measured by an observer sitting on the park bench, given that its proper length is 1.59 m.
An archer puts a 0.54 kg arrow to the bowstring. An average force of 202 N is exerted to draw the string back 1.3 m. suppose that air resistance is negligible.
A 75 kg parachutist descends through a vertical height of 310 m with constant speed. Find the increase in entropy produced by the parachutist, assuming the air temperature is 21°C.
A bicycle wheel is rotating at 45 when the cyclist begins to pedal harder, giving the wheel a constant angular acceleration of 0.42.
What is linear charge density of the insulating shell
The burning of gasoline in a car releases about 3 × 10^4 kcal/gal. If a car averages 43 km/gal when driving 90 km/h, which requires 20 hp, what is an efficiency of the engine under those conditions.
What types of lifestyle changes will be brought about by living in a house whose space heating and hot water needs are supplied almost completely by the sun.
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