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The envelope and basket of a hot-air balloon have a combined weight of 2.45 kN, and the envelope has a capacity (volume) of 2.18 x 103 m3. When it is fully inflated, what should be the temperature of the enclosed air to give the balloon alifting capacity (force) of 2.67 kN (in addition to the balloon"s weight)? Assume that the surrounding air, at20.0°C, has a weight per unit volume of 11.9 N/m3 and a molecular mass of 0.028 kg/mol, and is at a pressure of 1.0 atm.
A 2,284-kg car is moving down a road with a slope (grade) of 13% at a constant speed of 11 m/s. What is the direction and magnitude of the frictional force
Two small particles have charges Q1 = +2.5 C and Q2 = 5.5 C. If the magnitude of the electric force between the particles is 110 N, what is the distance between the particles?
A point charge Q1 is held at a distance r from the center of a dipole that consists of two charges ±q2 separated by a distance s. What is the magnitude of the force on the dipole
A 851-kg car stopped at an intersection is rear-ended by a 1760-kg truck moving with a speed of 17.5 m/s. find the final speed of both vehicles after the collision
An undiscovered planet, many light years from Earth, has one moon in a periodic orbit. Calculate the moon\'s radial acceleration
A 94 cm is pulled aside a small distance and released. After 120 oscillations the amplitude is one-half of its starting value. What is the value of the damping coefficient
an electron traveling at 713 ms enters a 0.9 t magnetic field. the angle between the velocity and the field is 90o.
q1. a home fragment found in a cave believed to have been inhabited by early humans contains 0.21 times as much14c as
consider a circuit consisting of a battery of voltage v and a parallel plate capacitor of capacitance of c0. if a
Students in a fraternity house want to be able to spray water 25 m across their neighbor's yard onto a patio. What size nozzle do they need
Find out the potential difference between r2 and r1
A community plans to build a facility to convert solar radiation to electrical power. They need 3.00 MW of power, and the system to be installed has an efficiency of 30.0% (that is, 30.0% of the solar energy incident on the surface is converted to us..
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