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Under standard conditions, the density of air is 1.293 kg/m3 and that of helium is 0.178 kg/m3. A spherical helium balloon lifts a basket plus cargo of mass 275.0 kg. What must be the minimum diameter of the spherical balloon?
A block of metal is placed on a top of a half-sphere made of ice. The block slides on the half-shpere down to a height (h) above the ground, What is the force exerted by the half-sphere on the block
Two equal positive charges of magnitude q1 = q2 = 6 nC are on the y axis at y1 = +3 cm and y2 = -3 cm. (a) What is the magnitude and direction of the electric field on the x axis at x = 6 cm? b) What is the force exerted on a third charge q0 = 4 n..
Polonium-210 decays to the ground state of Lead-206 by the emission of a 5.305-MeV alpha-particle with a half-life of 138 days. What mass of Polonium-210 is needed to produce 1 MW of thermal energy from its radioactive decay?
Illustrate what is the time necessary for crossing if the hunter wishes to move neither upstream nor downstream whilst crossing the river? Draw the vectors to scale on a graph to determine the answer.
A space probe with a rest mass of 8.1×107kg and a speed of 0.50c smashes into an asteroid at rest and becomes embedded within it. what is the rest mass of the asteroid
Two non conservative forces are present: friction does -2.00 104 J of work on the car, and a chain mechanism does +3.00 104 J of work to help the car up a long climb. What is the transform in the car's kinetic energy, ΔKE = KEf - KE0, from A to B.
A 14.9 cm long tendon was found to stretch 3.50 mm by a force of 15.0 N. The tendon was approximately round with an average diameter of 8.22 mm. Calculate the Young's modulus of this tendon
An open train car, with a mass of 2210 kg, coasts along a horizontal track at the speed 2.47 m/s. What is the car's speed after the loading is completed
q1. tarzan m 75 kg tries to cross a river by swinging from an 11.0 m long vine. his speed at the bottom of the swing
A screen is placed 1.20m behind a single slit. The central maximum in the resulting diffraction pattern on the screen is 1.40cm wide-that is, find the distance between the two second-order minima
A projectile of mass m is fired from the ground with an initial speed vi at an angle of q above the horizontal. At the highest point of its arc, it explodes into three pieces, A, B and C, all of equal mass. Immediately after the explosion, pieces A a..
What is the maximum tension. The gastrocnemius muscle, in the back of the leg, has two portions, known as the medial and lateral heads. Assume that they attach to Achilles tendon. The cross-sectional area of each of these two muscles is typically f..
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