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Determined to test the law of gravity for himself, a student walks off a skyscraper 180 m high, stopwatch in hand, and starts his free fall (zero initial velocity). Five seconds later, Superman arrives at the scene and dives off the roof to save the student. Superman leaves the roof with an initial speed v0 that he produces by pushing himself downward from the edge of the roof with his legs of steel. He then falls with the same acceleration as any freely falling body.(a) What must the value of v0 be so that Superman catches the student just before they reach the ground? (b) On the same graph, sketch the positions of the student and of Superman as a function of time for the case in (a).
explain force with the sensor report. what is the charge of the larger sphere.
Assume that each person is about the similar distance from the center of the field and can generate the same level of sound intensity. How numerous people are at the game.
A novice skier, starting from rest, slides down a frictionless 28.00 incline whose vertical height is 170. How fast is she going while she reaches the bottom?
assume the film show in the figure has an index of refraction of 1.36 and is surrounded by air on both sides.
The specific heat of water is 4186 J/kg•K. The latent heat of fusion is 333 kJ/kg. The density of water is 1.00 g/cm3.
A dynamite blast at a quarry launches a rock straight upward, and 2.1s later it is rising at a rate of 14m/s. assuming air resistance has no effect on the rock, compute its speed.
A satellite is placed between the Earth and the Moon, along a straight line that connects their centers of mass. The satellite has an orbital period around the Earth that is the similar as that of the Moon, 27.3 days. How far away from the Earth m..
The coefficient of static friction between the block and table's surface is &mu s = 1/3. The mass of the block that is hanging down is n1 Kg. The tangent of the angle shown in the figure is tan & theta = n2. What is the minimum value of mass, n3 Kg t..
A horizontal board weighing 198 N is supported at points A and B. The plank serves as a platform for a painter, who weighs 558.5 N. Find out the maximum distance D, such that the plank would not tip, no matter where the painter stands.
The Hall voltage across a conductor in a 55 magnetic field is 1.9 . When used with the same current in a different magnetic field, the voltage across the conductor is 3.
What is the change in entropy for the system. How much force must be applied to climb the hill at the same speed and same air resistance.
Three forces are applied to a tree sapling, to stabilize it. If F1= 282 N and F2= 355 N, find F3 in magnitude and direction. The angle between F1 and F2 is equivalent to 110 degrees.
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