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A 1000 kilogram wrecking ball hangs from a 15 meter long cable. The ball is pulled back until the cable makes an angle of 25o within the vertical. Find by how much has the gravitational potential energy of ball changed?
You are walking along a small country road one foggy morning and come to an intersection. At what speed is the ambulance traveling
Two children are holding on to opposite ends of a rope. The one on roller skates is being swung around in circles. if the moving child weighs 75 lb, if he attains constant speed of 12 ft/s, and if the rope is 10 ft long, how much tension is in the ro..
The distortion of Earth's crustal plates is an example of shear on a large scale. A particular crustal rock has a shear modulus of 1.0 1010 Pa. What shear stress is involved when a 9.0 km layer of this rock is sheared through a distance of 3.5-m?
In a certain library the first shelf is 15.0 off the ground, and the remaining four shelves are each spaced 32.0 above the previous one. If the average book has a mass of 1.7 with a height of 18 , and an average shelf holds 25 books, how much work is..
A cubical piece of heat-shield-tile from the space shuttle measures 0.12 m on a side and has a thermal conductivity of 0.065 J/(s·m·C°). The outer surface of the tile is heated to a temperature of 1110°C, while the inner surface is maintained at a..
You need a transformer to reduce a voltage of 150 V in the primary circuit to 25 V in the secondary circuit. What is the effective resistance of the secondary circuit
For the following circuit: V1 = 300 V, R1 = R4 = 10 ?, R2 = R3 = 20 ? and R5 = 40 ?. Find the equivalent resistance of the network
Two masses are connected as in the figure, where ?=40.0°, m1=13 kg and the coefficient of kinetic friction between the m2=7 kg object and the plane is ?k=0.25. Find the acceleration reached by the objects
The pressure inside a gas bottle at 25.5 °C is 3630 kPa. What will be the pressure inside the bottle
A moving particle encounters an external electric field that decreases its kinetic energy from 9910 eV to 6840 eV as the particle moves from position A to position B.
A distant galaxy emits light that has a wavelength of 683.2 nm. On earth, the wavelength of this light is measured to be 688.4 nm. (a) Decide whether this galaxy is approaching or receding from the earth.
Gold is the most ductile of all metals. For example, one gram of gold can be drawn into a wire 2.25 km long. What is the resistance of such a wire at 20°C
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