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a 1.8 kg block is initially at rest on a horizontal frictionless surface when a horizontal force in the positive direction is applied on the block. the force is given by F(x) = (2.8 - x^2) N, where x is in meters and the initial position of the block is x = 0.
a) what is the work done by the force between the initial position and x = 2.0 m?
b) what is the velocity of the block as it passes through x = 2.0 m?
Gold, which has a density of 19.32 g/cm3, is the most ductile metal and can be pressed into a thin leaf or drawn out into a long fiber, If a sample of gold with a mass of 2.477g, is pressed into a leaf of 4.116 ?m thickness, what is the area (in m2)..
A train moving with constant velocity travels 180 meters north in 14 seconds and an undetermined distance to the west. compute the direction of the train's motion relative to north
An event occurs at x′ =60m, t′ =8×10-8 sec in a frame S′ (with y′ =0, z′ = 0). The frame S′ has a speed of 3c/5 in the x direction with respect to frame S. The origins of S and S′ coincide at t = 0, t′ = 0. What are the spacetime coordinates of th..
(a) Determine the magnitude and direction of the electric field at the location of charge q. (Use k_e for the Coulomb constant and q and a as necessary.) Magnitude Direction ° (counterclockwise from the horizontal) (b) What is the total electric f..
A parallel plate capacitor is constructed with Teflon (dielectric constant 2.1) between the plates. What charge was originally stored
Two automobiles, each of mass 1.500*10^3 kg, travel in the same direction along a straight road. find the translational kinetic energy of the center of mass
You may have noticed a type of track lighting in museums or stores with modern decor called "cable track lighting." Bare power supply wires, What is the force between the long wires
Four wires meet at a junction. In two of the wires currents I1 = 1.55 A and I2 = 2.15 A enter the junction. Find the current in the fourth wire and indicate its direction
An interstate highway has been built through a neighborhood in a city. In the afternoon, What is the average late-night sound level
An 80 kg skydiver falls through air with a density of 1.15 kg/m3 . Assume that his drag coefficient is C=0.57. What are the terminal speeds in both cases
A 43.0-kg child swings in a swing supported by two chains, each 2.92 m long. The tension in each chain at the lowest point is 346 N. Find the child's speed at the lowest point
what is the magnitude of the force between the two charges. The scale of vertical axis is set by vs = 5.10 m/s. What is the coefficient of kinetic friction between block and floor.
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