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Suppose the potential energy of an object is given by:U = ar^2 + br^4where a = 5 J/m2 and b = 9.6 J/m4. What is the force on the object when it is at r = 2.9 m? A block of mass 2 kg is kept at rest as it compresses a horizontal massless spring (k = 120 N/m) by 8.52 cm. As the block is released, it travels 0.611 m on a rough horizontal surface before stopping. The acceleration of gravity is 9.8 m/s2 . Calculate the coe?cient of kinetic friction between surface and block.A box of mass 8 kg sits on a horizontal tabletop. An unstretched spring of force constant 420 N/m runs between the box and a wall. The coe?cient of friction between box and table is 0.5. Another box of mass 10 kg is hung from a string of negligible mass tied to the front of box 1, and allowed to fall from rest. By what amount has the spring has been stretched when the acceleration of the boxes has magnitude 1 m/s^2?
The inside diameters of the larger portions of the horizontal pipe depicted in the figure below are 2.42 cm. Determine the inside diameter of the constriction
the potential difference between the accelerating plates of a tv set is about 25 kv. if the distance between the plates
Indiana Jones is pushing back a 285 kg box which slides 4.3 m down a 29° incline and kept from accelerating. Calculate the force exerted by jones
A certain car is capable of accelerating at a rate of 0.63 m/s2. How long does it take for this car to go from a speed of 56 mi/h to a speed of 60 mi/h.
Determine the flux of particles escaping from the exobase of Earth's atmosphere using a number density at the exobase of 10^5 particles/cm^3 and a temperature of 700K.
You are visiting a friend in the hospital and realize someone is following you. If you hare 2.50 m from the mirror and the focal length of the mirror is 75.0 cm, how far is the stalker really from you
Compute the edge length of a cube that has the same volume as a sphere of radius 5.0 cm. How much greater is the surface area of the cube than that of the sphere (in cm2)
A syringe with a 4.0-cm-long needle is filled with water at20^\circ {\rm C}. What is the gauge pressure of the water
An object is located to the left of a concave lens whose focal length is -40 {cm}. find the distance through which the object should be moved
A 2000kg car traveling at a speed of 12m/s skids to a halt on wet concrete where ?k = 0.50. How long are the skid marks
A 50.g dart rests up against a spring that has been compressed 0.050 meters. If the dart were fired vertically, what height would it reach
Air, like all fluids, exerts a buoyant force on objects. THusan object's apparent weight in air is slightly less than its weightin a vacuum. What are the approximate dimensions of this shpae
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