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A 300-kg elevator is raised with a constant speed through a vertical distance of 100 m in two minutes. What is the useful output power of the hoist?
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An artillery shell is fired at an angle of 48.1? above the horizontal ground with an initial speed of 1920 m/s. The acceleration of gravity is 9.8 m/s2. Find the total time of flight of the shell, neglecting air resistan ...
Three people are fighting over a book. The mass of the book is m=9.18kg. Each person exerts a force on the book, F. The angle between the first person and the second person's force is 125.9 degrees. If the first person i ...
Question: One day when you come into physics lab you find several plastic hemispheres floating like boats in a tank of fresh water. Each lab group is challenged to determine the heaviest rock that can be placed in the bo ...
Question: Somebody on reddit posted a ridiculous picture today of a fly pierced onto a needle of a cactus: Whilst the OP claims the picture to be real, several people doubted the fly could ever reach enough momentum to a ...
Question: A resistor with resistance R and a capacitor with capacitance C are connected in series to an AC voltage source. The time-dependent voltage across the capacitor is given by VC(t)=VC0 sin t.If R = 3k, C=100pF, V ...
Question: A rock is suspended by a massless string. When the rock is invacuum, the tension in the string is 39.2 N. When the rock iscompletely immersed in water, the tension is 28.4 N. When the rockis completely immersed ...
A car accelerates down a hill, going from the rest to 30.0 m/s in 6.00 s. A toy inside the car hangs by a string from the car's ceiling. The ball in the figure represents the toy, of the mass 0.200 kg. The acceleration u ...
Question: A slab of insulating material of uniform thickness d, lying between -d/2 to +d/2 along the x axis, extends infinitely in the y and z directions. The slab has a uniform charge density Ï. The electric field is z ...
Question: A tank whose bottom is a mirror is filled with water to a depth of 19.4 . A small fish floats motionless 7.10 under the surface of the water. Part A) What is the apparent depth of the fish when viewed at normal ...
Consider the roller coaster below in terms of speed. Where will it speed up and where will it slow down? From this consideration, make a sketch of a velocity-time graph for this image. Explain your graph. Post your sketc ...
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