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A hot-air balloon is accelerating upward under the influence of two forces, its weight and the buoyant force. For simplicity, consider the weight to be only that of the hot air within the balloon, thus ignoring the balloon fabric and the basket. The hot air inside the balloon has a density of ?hot air = 0.93 kg/m3, and the density of the cool air outside is ?cool air = 1.29 kg/m3. What is the acceleration of the rising balloon?
A satellite with a mass of 250 kg moves in a circular orbit 7.00 multiply.gif 107 m above the Earth's surface. What is the gravitational force on the satellite
A parallel-plate capacitor in air has a plate separation of 1.49 cm and a plate area of 25.0 cm2. Determine the change in energy of the capacitor
Find the speed an alpha particle requires to come within 4.0x10-14 m of a uranium nucleus. Find the energy of the alpha particle
The mast of a sailboat is supported at the bow and stern by stainless steel wires, the forestay and backstay, Find the tension in the backstay and the force that the mast exerts on the deck
What law of physics would be violated
A source has a half life of 30.2 years. It was created 19 years ago with an initial activity of 1 micro curie. Calculate the initial number of atoms in the sample
A 2.2kg mud ball drops from rest at a height of 15m .f the impact between the ball, find the average net force exerted by the ball on the ground
The first controlled, sustained flight in a heavier-than-air craft was made by Orville Wright on December 17, 1903. The plane took off at the end of a rail that was 60 feet long, and landed 12 seconds later, 180 feet away from the beginning of the..
A 501g mass oscillates with an amplitude of 11.0cm on a spring whose spring constant is 23.0N/m, determine the period and max speed
Define proton-proton chain efficiently
when the field is vertical to the plane of loop, when the field makes a 90.0 angle with the normal to plane.
What is the effective spring constant (that is, the ratio of force to change in length) of a copper cable that is 7.0 in diameter and 13 long?
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