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1) Why is a hot air balloon stiff?
2) Is the pressure inside the balloon higher than the pressure outside (atmospheric pressure)?
3) If the pressure inside is higher than the outside, how is it explained with ideal gas law?
An electron is trapped somewhere in a molecule which is 5.8nmlong. Calculate the minimum kinetic energy of the electron
Manufacturers of headache remedies routinely claim that their own brands are more potent pain relievers than the competing brands. Find the number of molecules of pain reliever in the standard dose of Tylenol
A high energy photon is scattered at an angle of ?=180.0° from an electron that is initially at rest. Find the energy of the incident X-ray photon
Small charged sphere, mass m = 1.2 x 10-4 kg and charge q = 3.2 nC is suspended (floating) a very small distance above a very large sheet charge due to electrostatic forces. What is the charge density (charge per area) of the sheet essential for this..
Visible light passes through a diffraction grating that has 900 slits per centimetre, and the interference pattern is observed on a screen that is 2.58m from the grating. In the first-order spectrum, maxima for two dissimilar wavelengths are separate..
Does papillary muscles contract after the other ventricular muscles so that they can take up the slack on the chordae tendineae before the full force of ventricular contractions sends blood against the AV valve flaps.
Two sinusoidal waves of the same period, by amplitudes of 3.5 and 6.0 mm, travel in the same direction along a stretched string; they produce a resultant wave by amplitude of 9.119 mm. The phase constant of the 3.5 mm wave is 0. What is the stage con..
The police officer, knowing that the coefficient of kinetic friction between tires and road is 0.80, compute the speed of the sports car at impact.
A camera has a lens with a focal length of 29.4 cm. When an object is placed 3.95 meters away is being photographed, how far from the film should the lens be placed
Most of the motion generated by joints in the human body are examples of levers. An example of a third class lever is the forearm; what force is exerted by the biceps muscle
A coal fired plant generates 600 MW (5.18 x 10^13 J/day) of electric power. The plant burns 4.8 x 10^6 kg of coal each day. what is the ideal efficiency of this plant
A 9000pF capacitor holds plus and minus charges of 1.35×10?7C . What is the voltage across the capacitor
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