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The boxes are in contact, and a force of 60.0 N is applied horizontally to the smaller box. what is the acceleration of the two boxes?
Sam, whose mass is 80.0 , takes off down a 51.0 high, 9.0 slope on his jet-powered skis. The skis have a thrust of 220 . Sam's speed at the bottom is 45.0 . what is the coefficient of kinetic frict
The loaded cab of an elevator has a mass of 1.7 x 103 kg and moves 201 m up the shaft in 23 s at constant speed. At what average rate does the force from the cable do work on the cab?
A 1.0m diameter vat of liquid is 2m deep. There pressure at the bottom of the vat is is 1.3atm. What is the mass of the liquid in the vat?
Rank the four voltages, V1, V2, V3, and V4 in order of decreasing value. Rank from largest to smallest. To rank items as equivalent, overlap them.
Two Vectors, A and B, are added by means of vector addition to give a resultant vector R: R=A+B. The magnitudes of A and B are 6.2 m and 7.8 m, respectively, and they can have any orientation. What
An Alaskan rescue plane traveling 44 m/s drops a package of emergency rations from a height of 160 m to a stranded party of explorers. The acceleration of gravity is 9.8 m/s2 . Where does the packag
If the input force of moving a box of rocks yp a hill is 3 N and the output force needed to lift the box is 25N, what is the mechanical advantage of the inclined plane?
A chair of weight 115 lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of = 42.0 directed at an angle of 34.0 below the horizontal and the chair slides
Two point charges Q1=+5.10 nC and Q2=-3.40 nC are separated by 30.0cm. (a) What is the electric potential at a point midway between the charges? (b) What is the potential energy of the pair of char
A 55.0 kg person jumps from rest off a 8.0 m high tower straight down into the water. Neglect air resistance during the descent. She comes to rest 3.00 m under the surface of the water. Determine th
A railroad car of mass 2.8 104 kg moving at 2.50 m/s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at 1.20 m/s. (a) W
Next, the circle is vertical. In the vertical case the maximum tension in the string is 18.0% larger than the tension that exists when the circle is horizontal. Determine the speed of the stone.
A diving board of length 3.00 m is supported at a point 1.00 m from the end, and a diver weighing 520 N stands at the free end. The diving board is of uniform cross section and weighs 250 N. Find t
A 3.6 kg object hangs at one end of a rope that is attached to a support on a railroad boxcar. When the car accelerates to the right, the rope makes an angle of 45 with the vertical The acceleratio
A 0.8 kg stone attached to a string is whirled in a horizontal circle of radius .18 as in the figure below. The string makes an angle of 25° with the vertical. Find the tension in the string.
Friction and air resistance are negligible. What speed does the ball have when the cable makes an angle of 30 degrees with respect to the vertical?
The acceleration of gravity is 9.8 m/s2 .Determine the magnitude of the change in the block's kinetic energy.Determine the change in the block's potential energy.Assumed: The frictional force is con
An 87.7-g arrow is fired from a bow whose string exerts an average force of 115 N on the arrow over a distance of 75.0 cm. What is the speed of the arrow as it leaves the bow?
An electric field of 7.80 105 V/m is desired between two parallel plates, each of area 37.0 cm2 and separated by 2.45 mm of air. What charge must be on each plate?
The first person is initially moving forward with a speed of 2.40 m/s, and the second person is initially at rest. What are the velocities of the two people after the snowball is exchanged? Disregar
A thin 12.7 m long copper rod in a uniform magnetic field has a mass of 68.0 g. When the rod carries a current of 0.291 A, it floats in the magnetic field. What is the field strength of the magneti
Megan's mass is 30 kg. She climbs the 4.8 m ladder of a slide and reaches a velocity of 2.8 m/s at the bottom of the slide. How much work was done by friction on Megan?
An object weighs 286 N in the air. When tied to a string, connected to a balance, and immersed in water, it weighs 223 N. When it is immersed in oil, it weighs 259 N. (a) Find the density of the obj
Each cable has a length of = 3.70 . What is the tension in each of the cables? Use 9.80 for the magnitude of the acceleration due to gravity.