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A box of 25cm by 25cm by 25cm is placed in water, when a rat is placed on top of the box the box goes down by 2cm. what is the weight of the rat?
A force with a magnitude of 452N is used to bring an object with a mass of 56.0 kg moving at a velocity of 155m/s. How long will it take to bring the object to a full stop.
Find the angular momentum of the second hand on a clock. The second hand has a length of 20.0cm and a mass of 8.0g
A student tries to raise a chain consisting of three identical links. Each link has a mass of 0.360 kg. Find the force exerted by the top link on the middle link
If the refractive index of air is 1.00029 and all the air is pumped out of the cell, how many fringe-pairs will shift by
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 ?
In a head-on collision, a car stops in 0.17s from a speed of 30m/s . The driver has a mass of 78kg, What force is applied to the driver by his seat belt during that fraction of a second
The mean lifetime of muons in their rest frame is 2.20 ?s. Now consider a muon traveling through the Earth's atmosphere at a speed of 0.999 c. What is the mean distance traveled before it decays?
a projectile is fired horizontally from a gun that isnbsp61.0nbspm above flat ground emerging from the gun with a speed
A horizontal 797N merry-go-round is a solid disk of radius 1.53 m, started from rest by a steady horizontal force of 50.4 N applied tangentially to the edge of disk. Determine the kinetic energy of the disk after 3.06 s.
q1. a particular guitar string is supposed to vibrate at 195 hz but it is measured to actually vibrate at 210 hz. by
in the cathode ray tube in an old television set, electrons are accelerated from rest with a constant acceleration of magnitude 7.31*10^13 m/s2 during the first 2.77cm of tube's length; find the speed of the electron when they hit the screen
A person lifts a 4.5 kg cement block a vertical distance of 1.2 m and then carries the block horizontal. ly a distance of 7.3 m. Determine the work done by the person and by the force of gravity in this process.
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