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Friederich Bessel suspected that the star 61 cygni, scarcely visible with the naked eye, might be one of our closest neighbors. He was able to measure the total angular shift of 61 cygni, arising from the earth's orbital motion, as 0.628 arc seconds. Taking the average distance of the earth from the sun as 149.6 million km, calculate the distance to 61 cygni in meters and parsecs.
A balloon is released from a tall building. The total mass of the balloon including the enclosed gas is 1.5kg. Its volume is 2.5m^3. What is the average density of the balloon with gas
A ball with mass 450 grams hangs from a spring that is hanging from a ceiling. The spring's stiffness is 110 Newton’s/meter and its relaxed length hanging from the ceiling by the ball is 12.7 cm. What would be the relaxed length of the spring if the ..
A wheel having a radius 0.50 m and inertia of 11.7 kg · m2 is rotating freely at 54 rev/min. The wheel can be stopped in 4.0 s by pressing a rag against the rim and exerting a radially inward force of 75 N. Find the effective coefficient of kinetic f..
a 12,000 volt line produces 100,000 watts with a current of8.3 amps. If the voltage were only 240 volts, what would be the power expended as heat
A 180 ib soldier had an accident: He fell down from a helicopterhoverin at 150 ft above a sno packed ground. evaluate the direction of this net acceleration
A 0.056 kg aluminum bullet traveling at 462 m/s strikes an armor plate and comes to a stop. what is the bullet's temperature change in degrees Celsius
A wooden plank is raised at one end to an angle of 30 degree. A 2.0 kilogram box is located on the incline 1.0 meter from the lower end, Determine the rate of acceleration of the box
A spring-loaded cannon aimed at 47 deg. above the horizontal is on the last car of a long train of flat cars. How far from the cannon on the train does the projectile land
Air Bus company Key functional strategies
Suppose you are planning a trip in which a spacecraft is to travel at a constant velocity for exactly nine months, how fast must you travel
A 2-kg block is released from rest at the top of an inclined planeof angle θ = 30°. The block is located distance l =20 cm away from a spring that has spring constant k =300 N/m, as shown. The coefficient of friction between the block and plane is..
In a uniform electric field of magnitude E, the field lines cross through a rectangle of area A at an angle of 77.0° with respect to the plane of the rectangle, What is the magnitude of the flux through the rectangle
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