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An elevator moves downward in a tall building at a constant speed of 3.80 m/s. Exactly 3.95 s after the top of the elevator car passes a bolt loosely attached to the wall of the elevator shaft, the bolt falls from rest.
(a) At what time does the bolt hit the top of the still-descending elevator? (Assume the bolt is dropped at t = 0 s.)
(b) Estimate the highest floor from which the bolt can fall if the elevator reaches the ground floor before the bolt hits the top of the elevator. (Assume 1 floor congruent 3 m.)
If the coefficient of kinetic friction between the box and the roof is 0.55, with what speed must you push the box to have it gently come to rest right at the edge of the roof.
For a certain change, the value of ëU is -2.37 kJ. During the change, system absorbs 650 joules. How much work did the system do.
A ferry boat transports tourists among three islands. It sails from the first island to the second island, 4.7 km away, in a direction 37.0° north of east. It then sails from the second island to the third island in a direction 69.0° west of north..
A ball is thrown at an angle of 30.9 degrees above the horizontal at a speed pf 8.77 m/s. What is the vertical component of the ball's velocity
A violinist places her finger so that the vibrating section of a 1.3g/m string has a length of 40.00 cm, after that she draws her bow across it. A listener nearby in a 20 ^circ {rm C} room hears a note with a wavelength of 60.0cm. What is the tens..
Find the speed of the car when brakes were applied.
A 2.10-cm-high insect is 1.50m from a 139-mm-focal-length lens. Where is the image? Follow the sign conventions, How high is the image
Illustrate what is the maximum height of each ball after the elastic collision? What are the coordinates of the CM of the two balls when the lighter ball was pulled up? Consider the heavier ball to be at the origin before the collision.
A quarter circle of electric charge with a radius of 2.5 m has a uniform charge density of +0.7x10^-6 C/m. At the center of the circle
Mary needs to row her boat across a 120{\rm m} -wide river that is flowing to the east at a speed of 1.5{\rm m/s}. how far downstream will she land
An L-C circuit containing an 83.0-mH inductor and a 1.70-nF capacitor oscillates with a maximum current of 0.730A.calculate the energy stored in the inductor after 2.50ms of oscillation
A unit of area, often used in measuring land areas, is the "hectare", defined as 104m2. An open-pit coal mine consumes 66hectares of land, down to a depth of 23m, each year. What volume of earth, in cubic kilometers, is removed in this time.
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