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A 57-kg water skier is being pulled by a nylon tow rope that is attached to a boat. The unstretched length of the rope is 11 m and its cross-sectional area is 2.0 10-5 m2. As the skier moves, a resistive force (due to the water) of magnitude 120 N acts on her; this force is directed opposite to her motion. What is the change in the length of the rope when the skier has an acceleration whose magnitude is 0.90 m/s2?
A chair of mass 13.0kg is sitting on the horizontal floor; the floor is not frictionless, Use Newton's laws to calculate the normal force that the floor exerts on the chair
A uniform plank of length 5.8 m and weight 217N rests horizontally on two supports, with 1.1m of the plank hanging over the right support. To what distance x can a person who weighs 460 N walk on the overhanging part of the plank before it just beg..
The electric field lines on the left have twice the separation of those on the right. If the magnitude of field at point-A is 60 V/m, what is the magnitude of the field at point-B.
a jetliner is moving at a speed of 270 km/h. the plan then decelerates at 4.5 m/s2. what is the minimum runway length on which this aircraft can land
A 100-m-long train accelerates uniformly from rest. If the front of the train passes a railway worker 166-m down the track at a speed of 21 m/s, what will be the speed of the last car as it passes the worker.
Two 10 cm-diameter charged thin rings face each other, 20 cm apart. The left ring is charged to 20 nC and the right ring is charged to +20 nC. What is the electric field.
Cube of ice is taken from the freezer at -8.5°C and placed in a 75-gram aluminum calorimeter filled with 300.0 grams of water at room temperature of 20.0°C. The final situation is observed to be all water at 17°C. What was the mass of the ice cub..
A 2000-kg horizontal beam is supported at each end. A 160-kg load rests a quarter of the way from one end if the beam and 120 kg cargo is 1/3 from the other end. What is the vertical force on each of the supports.
A string with a mass of 31 g and a length of 2 m is stretched under a tension of 67 N. How much power must be supplied to the string to generate a traveling wave that has a frequency of 51 Hz and an amplitude of 4 cm.
A projectile is fired with an initial speed of 68.8 at an angle of 37.8 above the horizontal on a long flat firing range. Find out the maximum height reached by the projectile.
Suppose the second distance d were traveled in the opposite direction; you forgot something and had to return home at the same constant speed as found in part (a). What is the average velocity for this trip.
The drawing shows a mercury barometer. Consider two barometers, one using mercury and another using an unknown liquid. assume that the pressure above the liquid in each tube is negligible. The height of the unknown liquid is 18.3 times greater tha..
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