Concept explainers
(a)
The credibility of the hypothesis (along with uncertainties) that the balloon is slowly leaking to explain the phenomena that when Jeff and Natalie inflate a rubber balloon in a warm room, shrinks when they take it to the garden on a cold winter day based on the following data recorded by their series of experiments including uncertainties:
(b)
The credibility of the hypothesis (along with uncertainties) that the air inside the balloon is undergoing an isobaric compression to explain the phenomena that when Jeff and Natalie inflate a rubber balloon in a warm room, shrinks when they take it to the garden on a cold winter day based on the following data recorded by their series of experiments including uncertainties:
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College Physics
- A manometer containing water with one end connected to a container of gas has a column height difference of 0.60 m (Fig. P15.72). If the atmospheric pressure on the right column is 1.01 105 Pa, find the absolute pressure of the gas in the container. The density of water is 1.0 103 kg/m3. FIGURE P15.72arrow_forwardA gas is in a container of volume V0 at pressure P0. It is being pumped out of the container by a piston pump. Each stroke of the piston removes a volume Vs through valve A and then pushes the air out through valve B as shown in Figure P19.74. Derive an expression that relates the pressure Pn of the remaining gas to the number of strokes n that have been applied to the container. FIGURE P19.74arrow_forwardThe density of air in the Earths atmosphere decreases according to the function =0eh/h0, where 0=1.20kg/m3 is the density of air at sea level and h0 is the scale height of the atmosphere, with an average value of 7640 m. What is the maximum payload that a balloon filled with 2.50 103 m3 of helium (He=0.179kg/m3) can lift to an altitude of 10.0 km?arrow_forward
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- How many cubic meters of helium are required to lift a light balloon with a 400-kg payload to a height of 8 000 m? Take Hc = 0.179 kg/m3. Assume the balloon maintains a constant volume and the density of air decreases with the altitude z according to the expression pair = 0e-z/8 000, where z is in meters and 0 = 1.20 kg/m3 is the density of air at sea level.arrow_forwardReview. (a) Derive an expression for the buoyant force on a spherical balloon, submerged in water, as a function of the depth h below the surface, the volume Vi of the balloon at the surface, the pressure P0 at the surface, and the density w of the water. Assume the water temperature does not change with depth, (b) Does the bouyant force increase or decrease as the balloon is submerged? (c) At what depth is the buoyant force one-half the surface value?arrow_forwardA person is in a closed room (a racquetball court) with v=453 m3 hitting a ball (m 42.0 g) around at random without any pauses. The average kinetic energy of the ball is 2.30 J. (a) What is the average value of vx2 ? Does it matter which direction you take to be x ? (b) Applying the methods of this chapter, find the average pressure on the walls? (c) Aside from the presence of only one "molecule" in this problem, what is the main assumption in Pressure, Temperature, and RMS Speed that does not apply here?arrow_forward
- You have probably noticed that carrying a person in a pool of water is much easier than carrying a person through air. To understand why, find the buoyant force exerted by air and by water on the person. Assume the average volume of a person is 0.45 m3, and that the person is submerged in air and water respectively.arrow_forwardWhy is the Earths atmosphere denser near sea level than it is at a high altitude? Be sure to explain why the atmospheres density is not uniform and why the air isnt all in contact with the Earths surface.arrow_forwardFor the exam scores given in Table P20.60, find the average score and the rms score. Table P20.60arrow_forward
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