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A box rests on top of a flat bed truck. The box has a mass of m = 16.0 kg. The coefficient of static friction between the box and truck is ?s = 0.81 and the coefficient of kinetic friction between the box and truck is ?k = 0.63. * The truck accelerates from rest to vf = 19.0 m/s in t = 12.0 s (which is slow enough that the box will not slide). What is the acceleration of the box? m/s2 * In the previous situation, what is the frictional force the truck exerts on the box?
football player kicks a ball with a speed of 22.1 m/s at an angle of 46° above the horizontal from a distance of 38 m from the goal line. What is the vertical velocity of the ball at the time it reaches the goalpost
A bug (2 grams) crawls from the center to the edge of a disk that is freely turning at 20 rpm. What is the disk's new angular speed
A certain automobile engine delivers 2.24 104 W (30.0 hp) to its wheels when moving at a constant speed of 21.0 m/s ( 47 mi/h). What is the resistive force acting on the automobile at that speed?
A current of 2.45 A flows along the length of a long solid cylindrical conductor. The radius of the cylinder is 8.5 cm. The current is uniformly distributed through the conductor. Calculate the magnitude of the magnetic field 2.4 cm from the cente..
A 1500 kg car moving east at 26 m/s collides with a 1720 kg car moving south at 15 m/s and the two cars stick together.
A rubber ball is dropped from rest 3.0m onto level ground. Bouncing back, the ball loses 25% of its mechanical energy. To what height does it rebound
What is the amount of the normal force on the charge on the surface in Newtons, when including both the weight of the object and the electric force on it?
If the surface area of a human is 1.7 m^2 and each square inch of skin contains 75 pressure sensors
The punter on a football team tries to kick a football so that it stays in the air for a long "hang time." what is the "hang time"
At the surface of an electrically charged solid conducting sphere the electric field has a magnitude of 458 N/C and the electric potential is 164 V lower than it is infinitely far from the sphere
A piece of copper with a mass of 1.0kg and density of 8900kg/m^3 is suspended from a string and conpietely in a contaner with water. determine the volurm of the piece of copper
q1. suppose we had a rubber ball like the ones used for racquetball and put it inside a container with liquid nitrogen.
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