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Assuming wind forces can be neglected, what is the highest that one can make a solid concrete tower of uniform cross-section (Take the density of concrete to be 2,400 kg/m^3)?
For concrete:
Youngs Modulus E is 20 x 10^9 N/m^2
Yield Stress is 40 x 10^6 N/m2
An electron moving parallel to the x axis has an initial speed of 3.70*10^6m/s at the origin. Its speed is reduced to 1.40*10^5m/s at the point x=2cm. Which point has higher potential energy
A ball rolls off a table and falls 0.81 m to the floor, landing with a speed of 5.5 m/s. What initial speed must the ball have if it is to land with a speed of 6.3 m/s
A car accelerates from rest to a kinetic energy of 1.65 x 10^5 Joules in a distance of 646 m. How much force did the car's engine deliver to produce the change in kinetic energy.
The place you get your hair cut has two nearly parallel mirrors 7.00 apart. As you sit between these mirrors in the chair, your head is 2.50 from the mirror in front of you. How far away does the back of your head appear to be
A house has a floor area of 115 m2 and an outside wall that has an area of 24 m2. The earth's magnetic field here has a horizontal component of 2.50 e 10-5 T that points due north and a vertical component of 4.30 e 10-5 T that points straight down..
A projectile is launched perpendicularly upward from a planet of mass M; and radius R; its initial speed is twice the escape speed. Derive an expression for its speed as a function of the distance from the center of the planet.
Suppose that you start with 1.41 mg of a pure radioactive substance and 2.30 h later determine that only 0.252 mg of the substance remains
An L-C circuit containing an 83.0-mH inductor and a 1.70-nF capacitor oscillates with a maximum current of 0.730A.calculate the energy stored in the inductor after 2.50ms of oscillation
A boy whirls a stone using an r-m long string in a horizontal circle h m above the ground. The string broke, and the stone flies off horizontally and strike the ground x m away.The velocity with which the stone flies off the circle is? The centrip..
Calculate the time constant that is equal to the time taken by a capacitor to fully charge or discharge.
In a certain time period a coil of wire is rotated from one orientation to another regarding a uniform 0.38-T magnetic field. The emf induced in the coil is 3.5 V. Other things being equal, what will the induced emf be if the field had a magnitude..
Tetchnetium is a radioactive isotope that emits a gamma ray with a half life of 6 hours. what fraction of the original dose remains in the body 24 hours after preparation
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