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A 650 kg elevator starts from rest. It moves upward for 3.50 s with stable acceleration until it reaches its cruising speed 1.75 m/s.
Calculate average power of elevator motor during this period?
There are two stable isotopesof the element Lithium. One of them has three neutrons and the other has four. All other isotopes are radioactive withshort half lives. Using the periodic table in the textbook,
A water pipe at the top of a hill has a cross sectional area of 0.052 m2 and carries a flow rate of 0.75 m3/s. The pressure in this pipe is 1.8 x 105 N/m2. What is the pressure in the small pipe at the bottom
The position of a 30 g ball is measured to be 27.3 cm +/- .004 cm (that is: the position is 27.3 cm with an uncertainty of .004 cm) What is the uncertainty in the velocity of the ball
a person stands at the base of a hill that is a straigt incline making an angle omega with the horizontal. for a given
An object initially at rest experiences an acceleration of1.7m/s2 for 7.0s and then travels at that constantvelocity for another 7.0s. What is the objects average velocityover the 14s interval?
ConsideragainFig.1.12.Nowletthe14-kgweighthangfromthemid- dle of the lower arm (20 cm from the fulcrum). Calculate the biceps force and the reaction force at the joint
A photographic image of a building is 0.0920 m high. The image was made with a lens with a focal length of52.0mm. determine the height of the building
Imagine that you swing about your head a ball attached to theend of a string. The ball moves at a constant speed in a horizontal circle. What centripetal force are you imparting to the ball via the string
An X-ray photon scatters from a free electron at rest at an angle of 175%u2218 relative to the incident direction, Determine the energy of the incident photon
A heavy-duty stapling gun uses a 0.164 kg metal rod that rams against the staple to eject it. The rod is pushed by a stiff spring called a "ram spring" (k = 30071 N/m). find the speed of the ram at the instant of contact
Two particles execute simple harmonic motion of the same amplitude and frequency along close parallel lines. What is their phase difference
A gymnast performing a routine on the high bar feels weightless at the highest point of their rotation. Why does the gymnast feel weightless at the highest point of their rotation around the bar? What is the cause of this phenomenon
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