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A plastic bag is filled with helium at atmospheric pressure and 23.0 oC. Assume that the mass of the bag is negligible and take the temperature of the outside air to be 0 oC. With the help of this "balloon" we want to lift a 50.0 kg girl off her feet.
a) How large a volume of helium (in m3) is required?
b) If hot air is used instead of helium, what is the required volume of the balloon if the air inside can be maintained at 36.0 oC ?
A system consisting entirely of electrons and protons has a net charge of 1.64×10?15C, How many electrons and protons are in this system
A block of mass 7.1 kg is pulled along a horizontal frictionless floor by a cord that exerts a force of 41.0 N at an angle 34.9° above the horizontal, What is the magnitude of the normal force exerted on the mass
You are in a space shuttle traveling in the circular orbit, which is 410 km above the Earth. How long will it take you to catch up with your friend if you reduce your orbital radius by 1 km
monochromatic light falls on a screen 1.90 m from two slits separated by 2.07 mm. the first- and second-order bright
two sealed containers with volumes V1 and V2, respectively, contain dry air at pressures p1 and p2 and room temperature T. Find an expression for the new pressure
A kid fires water horizontally from a squirt gun held 1.6 above the ground. It hits other kid 2.4 away squares in the back, at a point 0.85 above the ground. What was the initial speed of the water.
A physics lab demonstrates the principles of simple harmonic motion (SHM) by using a spring affixed to a horizontal support. The student is asked to find the spring constant, k. After suspending a mass of 335.0 g from the spring, the student notic..
An electron has a kinetic energy of 6.00 10-17 J. It moves on a circular path that is perpendicular to a uniform magnetic field of magnitude 4.70 10-5 T. Determine the radius of the path
A 31 μF capacitor is connected across a programmed power supply. find the power output from the power supply
Consider a system of two bound particles (e.g., two nucleons bound by the weak force), of spins S1, S2, with s1 = s2 = 1/2. In an external magnetic field, the interaction Hamiltonian is H = µB · S, with S = (S1 + S2). A random distribution (contai..
question1 a high speed train in japan travels a distance of 300 kilometres in 3.60x103 seconds. what is an average
The coefficient of kinetic friction between a 20 Kg box and the floor is 0.40. How much work does a pulling force do on the box in pulling it 8.0 m at the constant speed? The pulling force is directed 390 above the horizontal.
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