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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 brave but inadequate rugby player is being pushed backward by an opposing player who is exerting a force of 800 N on him. What force does the winning player exert on the ground to move forward if his mass plus equipment is 110 kg
A mountain climber, in the process of crossing between two cliffs by a rope, pauses to rest. She weighs 576 N. As the drawing shows, she is closer to the left cliff than to the right cliff, with the result that the tensions in the left and right s..
A rectangular pipe carries water over a horizontal distance of 10m. At what speed does water enter the pipe
A 50-kg dancer stands on her toes during a performance with foursquare inches in contact with the floor. What is the pressure exerted by the floor
A motor has coils with a resistance of 28 and operates from a voltage of 235 V. When the motor is operating at its maximum speed, the back emf is 147 V. Find the current in the coils when the motor is first turned on
A rock is thrown down a well that is 8.85 meter deep. The splash is heard 1.20 sec later. Evaluate how deep is the well
Suppose that a simple pendulum consists of a small 61 g bob at the end of a cord of negligible mass. find the pendulums maximum kinetic energy
A torpid consisting of 500 loops of wire carries a current of 3.25 Amp. Find the strength of the magnetic field at the inner radius of the torpid
A block of mass m1= 0.50kg placed in top of another block of mass m2= 0.80 kg, which rests on a frictionless surface. A horizontal force of 2.0N is applied to the lower block. Find the acceleration of the system of two blocks
Two boxes of masses, m and 2m, are in contact with each other on a frictionless surface. What is the acceleration of the more massive box
One of the most efficient engines ever built is a coal-fired steamturbine in the Ohio valley, driving an electric generator as itoperates between 1870°C and 430°C. What is its maximum theoretical efficiency
Brian is trying to pull Julie on a sled across a flat snowy field. Brian pulls on a rope attached to the sled. how much force must Brian exert on the rope to start moving the sled
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