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Workers pushing a 180 kg trunk across a level floor encounter a 10m long region where the floor becomes increasingly rough; the coefficient of kinetic friction increases from mo =.17to .79 according to the expression (mk = mo +ax2) where a= 0.0062 m-2, and x is thedistance in meters from the beginning of the rough region. How much work does it take to push the trunk at constant speed across the region?
A uniform rope of uniform weight W hangs between two trees. The ends of the rope are the same height and they each make and angle theta with the trees. What is the tension at either end of the rope. Find the tension at the middle of the rope.
A mixture of iron and an unknown material is bombarded with electrons. What is the unknown material (use chemical symbol)
An object 1.0 cm high is placed on the optical axis of a 10 cm focal length lens, 18 cm from the lens. Find the location, size, and orientation of the image
A hammer strikes one end of a thick steel rail of a length 8.50 m. A microphone located at the opposite end of the tail detects two pulses of sound, Find the separation in time between the arrivals of the two pulses
A metal must absorb radiation with a minimum frequency of 1.94 e15 Hz before it can emit an electron from its surface via the photoelectric effect, find the speed of the photo-electrons
A charge of -2.615"mu"C is located at (2.915m , 4.400m ), and a charge of 1.705"mu"C is located at (-2.641m , 0). Find the electric potential at the origin. Express your answer using three significant figures
a sailboat is traveling east at 5.9 . a sudden gust of wind gives the boat an acceleration 0.80 40 north of east.
Two people stand 3 m in front of large plane mirror and space 5m a part in dark room at what angle of incidence should one of them shine a flashlight on the mirror so that reflected beam directly strickes the other person.
A toy top has a string wrapped around its body. The string has a length of 64cm and is wrapped around the top at a place where its radius is 2.0cm. What is the final angular velocity in rpm of the top when the string is completely unwound
An ideal, monatomic gas is allowed to expand quasi-statically and adiabatically from an initial volume Vi = 4.1 liter and initial temperature Ti = 390 K to a final volume of Vf = 9.2 liter. Calculate the heat added to the system in this isothermal ..
A pion is an unstable particle that has an average lifetime of 2.55 × 10-8s. How far does it travel in its lifetime, relative to Earth
A projectile is launched at ground level with an initial speed of 50.0 m/s at an angle of 30.0º above the horizontal. It strikes a target above the ground 3.00 seconds later. What are the x and y distances from where the projectile was launched to..
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