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A spherical weather balloon is filled with hydrogen until its radius is 3.00 m. Its total mass including the instruments it carries is 15.0 kg.
(a) Find the buoyant force acting on the balloon, assuming the density of air is 1.29 kg/m3. N
(b) What is the net force acting on the balloon and its instruments after the balloon is released from the ground? N
(c) Why does the radius of the balloon tend to increase as it rises t
A charge of -0.62 m/C with an unknown mass hangs vertically from a string. A uniform electric field, which runs parallel to the ground (in the + x direction) is then turned on.
In one design, the large spring with spring constant 2.0×10^4 was placed behind the cannon. The other end of the spring braced against a post that was firmly anchored to the ship's frame.
What is the electrostatic force on each particle.
A person exerts a horizontal force of F = 179N in the test apparatus shown in the drawing. (h = 0.33 m.) Determine the horizontal force M that his flexor muscle exerts on his forearm.
A 380kg piano slides 3.2m down a 27â degrees incline and is kept from accelerating by a man who is pushing back on it parallel to the incline, What is the force exerted by the man
A light spring-gun projectile launcher is mounted on an 0.453 kg air track glider. The gun points upward at an angle of 32 o with the horizontal track. What is the speed of the air-track glider after the gun is fired
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The elevator is firstly at rest. How far does the elevator move even as accelerating to full speed from rest.
calculate the speed of sound and uncertainty of the speed of sound for a lab report. The equation for the speed of sound is V=4LS
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It rolls at a steady speed for 1.9 s, then one wheel begins to stick. The train comes to a stop 6.0 m from its starting point. Illustrate what is the train's acceleration after its wheel begins to stick?
35MW of power at 45kV (rms) arrives at a town from a generator via 5.0? transmission lines. Calculate the emf at the generator end of the lines
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