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1. A hot-air balloon achieves its buoyant lift with heating the air inside the balloon, which makes it less dense than the air outside. Suppose the volume of a balloon is 1600 m3 and the needed lift is 2200 N (rough estimate of the weight of the equipment and passenger). Compute the temperature of the air inside the balloon which will produce the required lift. Suppose that the outside air temperature is 0°C and that air is an ideal gas under these conditions.
What factors limit the maximum altitude attainable by this method for a given load? (Neglect variables like wind.)
2. An ordinary glass is full to the brim with 359.0 mL of water at 100°C. If the temperature decreased to 22°C, how much water could be added to the glass?
a grindstone has a radius of 6.00 cm and rotates at 7000 rpm. What is the linear speed of a point on its edge
A 0.150 T magnetic field B crosses the xyplane perpendicular to the x axis and at an angle of45.0° to the y axis. A square surfacewith sides of length 7.00 m lies mainly in the xyplane, but a 1.50 m section of it at one end is bent 90°in the negat..
A water-skier is being pulled by a tow rope attached to a boat. As the driver pushes the throttle forward, the skier accelerates. A 61.3-kg water-skier has an initial speed of 5.5 m/s. Later, the speed increases to 11.3 m/s. Determine the work done b..
q1. in a photoelectric effect experiment 325 nm photons strike a cathode that has a work function equal to 1.25 ev.
A copper wire has a square cross section 2.7 on a side. The wire is 3.8 long and carries a current of 4.0 . The density of free electrons is 8.5*10^28 m^-3.
A bowling ball of mass 2.7 kg and radius 9.5 cm rolls from rest, What is the speed of the ball at the bottom of the incline
A "red-hot" object is measured to have a frequency of 1.0x 10^14 Hertz. Determine what is the Celsius temperature of the object
A baseball player friend of yours wants to determine his pitchingspeed. You have him stand on a ledge and throw the ballhorizontally from an elevation 7.00 m above the ground. The ball lands 30.0 m away.
A capacitor of unknown capacitance C is charged to 100 V and then connected across an initially uncharged 60-μF capacitor. If the final potential difference across the 60-μF capacitor is 40 V, determine C.
A 3.0 kg mass is attached to a vertical spring hanging from the ceiling. The spring and mass are stationary. The spring constant for the spring is 250 N/m. What is the gravitational potential energy of the system
A small bag of sand is suspended by a wire of length L=1.2 m. A bullet of mass m=8 gr, moving with speed v0=600 m/s in the horizontal direction, What is the mass of the bag
A block of mass m1 = 1.75 kg and a block of mass m2 = 5.90 kg are connected by a massless string over a pulley in the shape of a solid disk having radius R = 0.250 m and mass M = 10.0 kg. These blocks are allowed to move on a fixed block-wedge of ..
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