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A woman inside an elevator is standing on a scale. Before the elevation it starts moving the scale shows 50 kg, calculate the acceleration of the elevator if when it starts moving upward the scale reads 70kg. What will the reading of the scale be when the elevator moves downward with the same acceleration?
The entire string is 2.00m long and has a mass of 400-g. The vibrating section of the string is 1.90m long. What tension is needed to tune this string properly.
A tennis ball is thrown toward a vertical wall with a speed of 22.0 m/s at the angle of 40.0° above the horizontal. The horizontal distance between the wall and the point where the tennis ball is released is 28.0 m.
A cardinal (Richmondena cardinalis) of mass 4.00×10-2 and a baseball of mass 0.143 have the equal kinetic energy. What is the ratio of the cardinal's magnitude of momentum to the magnitude of the baseball's momentum?
The inner and outer surfaces of a cell membrane carry a negative and positive charge, respectively. Because of these charges, a potential difference of about 0.077 V exists across the membrane. The thickness of the membrane is 8.1 x 10-9 m. What i..
A closely wound rectangular coil of 80 turns has dimensions 25 rm cm by 40 rm cm. The plane of the coil is rotated from a position in which it makes an angle of 37 degrees with a magnetic field of 1.10 rm T to a position perpendicular to the field..
In response to a stimulus, membrane can become permeable to Na ions. As Na ions rush into the cell, the interior of the cell reaches an electric potential of about 40 rm mV.
A uniform plank of length 5.8m and weight 229N rests horizontally on two supports, with 1.10 m of the plank hanging over the right support (see the drawing). To what distance x can a person who weighs 450N walk on the overhanging part of the plank be..
A 21.5 g bullet strikes a 0.650 kg block attached to a fixed horizontal spring whose spring stiffness constant is 7.30 x 10^3 N/m and sets it into vibration with an amplitude of 21.5 cm. What was the speed of bullet before impact if the bullet and bl..
how long does it take for a person to radiate. Calculate the time of flight.
find electric field produced by the particles equal to zero. Find out the x and y components of this force.
A train at a constant 75 km/h moves east for 48 min, then in a direction 61.0° east of due north for 11min, and then west for 67 min.
Small telescopes are often advertised as "200 power" or "magnifies 200 times." As someone knowledgeable about astronomical telescopes, how would you progress such advertisements.
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