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The densities of air, helium, and hydrogen (at p = 1.0 atm and T = 20°C) are 1.20 kg/m', 0.166 kg/m, and 0.0899 kg/m, respectively.
(a) What is the volume in cubic meters displaced by a hydrogen-filled airship that has a total "lift" of 120 kN? (The "lift" is the amount by which the buoyant force exceeds the weight of the gas that fills the airship.)
(b) What would be the "lift" if helium were used instead of hydrogen? In view of your answer, why is helium used in modern airships like advertising blimps?
Monochromatic light falls on two very narrow slits0.042mm apart. Successive fringes on a screen6.50m away are 8.4cm apart near the center of the pattern. Determine the frequency of the light.
A 2.0 kg bike wheel, which can be taken as a hoop witha radius of 0.40 m and a 0.50 kg disk with a radius of 0.15 m are attached to a common axle and are initially rotating together at aconstant angular velocity of 2.0 rev/s
Now, a second resistor R2 of 3.2x10^5 ? is connected in parallel to the existing resistor in the circuit, and a second capacitor C2 = 4.20 µF is connected to the existing capacitor in parallel. What will be the new time constant
Three charges are at rest on the z axis: q1 = ?7.21 mC at z = 4.58 m, q2 = ?1.79 mC at z = 0 m, What is the potential energy of this system
A helium-neon laser beam has a wavelength in air of 633 nm. It takes 1.48 ns for the light to travel through 29 cm of an unknown liquid. Determine the wavelength of the laser beam in the liquid
When struck by a club, a golf ball initially at rest gets a speed of 31 m/s. evaluate what is the magnitude of the average acceleration
question a projectile is launched from a platform 35 feet high with an initial velocity of 20 feet per second. the
The speed of a bullet as it travels down the barrel of a rifle toward the opening is given by v = (-5.30 107) t 2 + (3.15 105) t, where v is in meters per second and t is in seconds.
A person pulls a toboggan for a distance of 40.1 m along the snow with a rope directed 21.3 ° above the snow. How much work is done on the toboggan by the tension force
A 45 cm diameter circular loop of wire is in a 0.525 T magnetic field oriented perpendicular to the plane of the loop. what is the average induced emf
Imagine that we define the rear end of a train 120 m long to long to define the origin X'=0 in the train frame and we define a certain track signal light to define the origin X=0 in the track frame. Where does this event occur in the train frame
Three conducting spheres of identical radius but made of dissimilar metals copper, gold and silver. One of the spheres (gold) carries excess charge of +Q. If they are all brought into contact with a metal rod and then separated, what will be the char..
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