Question

In: Physics

A meat baster consists of a squeeze bulb attached to a plastic tube. When the bulb...

uploaded imageA meat baster consists of a squeeze bulb attached to a plastic tube. When the bulb is squeezed and released, with the open end of the tube under the surface of the basting sauce, the sauce rises in the tube to a distance h, as the drawing shows. Using 1.013 × 105 Pa for the atmospheric pressure and 1470 kg/m3 for the density of the sauce, find the absolute pressure PB in the bulb when the distance h is (a) 0.20 m and (b) 0.12 m.



(a) PB =
(b) PB =

Solutions

Expert Solution

(a)

In the first trail \(h=0.20 \mathrm{~m}\) Upward Pressure due to sauce, \(P=h \rho g\)

$$ \begin{array}{l} =(0.20 \mathrm{~m})\left(1470 \mathrm{~kg} / \mathrm{m}^{3}\right)\left(9.8 \mathrm{~m} / \mathrm{s}^{2}\right) \\ =2881.2 \mathrm{~Pa} \end{array} $$

So total pressure in the bulb is \(=P_{0}-P\)

$$ \begin{array}{l} =\left(1.013 \times 10^{5} \mathrm{~Pa}\right)-\left(0.028812 \times 10^{5}\right) \mathrm{Pa} \\ =0.9842 \times 10^{5} \mathrm{~Pa} \\ =9.842 \times 10^{4} \mathrm{~Pa} \end{array} $$

(b)

In the second trail \(\quad h=0.12 \mathrm{~m}\) Upward Pressure due to sauce, \(P=h \rho g\)

$$ \begin{array}{l} =(0.12 \mathrm{~m})\left(1470 \mathrm{~kg} / \mathrm{m}^{3}\right)\left(9.8 \mathrm{~m} / \mathrm{s}^{2}\right) \\ =1728.72 \mathrm{~Pa} \\ =0.017287 \times 10^{5} \mathrm{~Pa} \end{array} $$

So total pressure on the bulb is \(=P_{0}-P\)

$$ \begin{array}{l} =\left(1.013 \times 10^{5}\right)-\left(0.017287 \times 10^{5}\right) \mathrm{Pa} \\ =0.9957 \times 10^{5} \mathrm{~Pa} \end{array} $$


Related Solutions

A solar collector design consists of an inner tube enclosed concentrically in an outer tube that...
A solar collector design consists of an inner tube enclosed concentrically in an outer tube that is transparent to solar radiation. The tubes are thin walled with inner and outer diameters of 0.08 and 0.10 m, respectively. The annular space between the tubes is completely enclosed and filled with air at atmospheric pressure. Under operating conditions for which the inner and outer tube surface temperatures are 80 and 30°C, respectively, what is the rate of convective heat loss per meter...
Conceptual: Consider a lightbulb attached to a battery with wires. How must the light bulb be...
Conceptual: Consider a lightbulb attached to a battery with wires. How must the light bulb be connected in order for it to light? Identify the relevant parts of the bulb and battery and explain the concept of
A deli meats factory pumps a liquefied meat mixture through round plastic pipe that is 75mm...
A deli meats factory pumps a liquefied meat mixture through round plastic pipe that is 75mm inside diameter. Assume that the liquid meat mixture has a specific gravity of 0.9, a dynamic viscosity of 0.1N∙s/m^2, and that it flows at an average speed of 0.5m/s. a) What is the kinematic viscosity of the liquefied meat mixture in m2/s? b) What is Reynolds number for liquefied meat mixture? c) Is the flow laminar or turbulent? d) What is the mass flow...
When the voltage across a ‘300V 300W’ bulb is 600V, the power dissipated in the bulb must be
When the voltage across a ‘300V 300W’ bulb is 600V, the power dissipated in the bulb must be75W.150W.300W.600W.1200W.
A basic electrical circuit consists of a battery, a light bulb, a switch and wires connecting...
A basic electrical circuit consists of a battery, a light bulb, a switch and wires connecting them. As soon as the switch is closed, even the light bulb is one mile away, the light bulb will be on IMMEDIATELY.  This means that the electrical current (made of moving electrons) starts to run everywhere in the wire as soon as the switch is closed. Explain: a) the origin of these free moving electrons (where do they come from), b) the force(s) that...
A basic electrical circuit consists of a battery, a light bulb, a switch and wires connecting...
A basic electrical circuit consists of a battery, a light bulb, a switch and wires connecting them. As soon as the switch is closed, even the light bulb is one mile away, the light bulb will be on IMMEDIATELY.  This means that the electrical current (made of moving electrons) starts to run everywhere in the wire as soon as the switch is closed . Explain what happen and the source(s) of these free moving electrons.
A 0.504 kg metal cylinder is placed inside the top of a plastic tube, the lower...
A 0.504 kg metal cylinder is placed inside the top of a plastic tube, the lower end of which is sealed off by an adjustable plunger. The cylinder comes to rest some distance above the plunger. The plastic tube has an inner radius of 5.54 mm and is frictionless. Neither the plunger nor the metal cylinder allow any air to flow around them. If the plunger is suddenly pushed upwards, increasing the pressure between the plunger and the metal cylinder...
a) a simple harmonic oscillator consists of a glass bead attached to a spring. it is...
a) a simple harmonic oscillator consists of a glass bead attached to a spring. it is immersed in a liquid where it loses 10% of its energy over 10 periods. compute the coefficient of kinetic friction b assuming spring constant k=1 N/m and mass m=10 grams; b) suppose the spring is now disconnected and the bead starts failing in the liquid, accelerating until it reaches the terminal velocity. compute the terminal velocity.
(8%) Problem 9: A constant-volume thermometer consists of a rigid bulb and a pressure gauge. To...
(8%) Problem 9: A constant-volume thermometer consists of a rigid bulb and a pressure gauge. To obtain accurate results, this thermometer must be calibrated at a known pressure and temperature. Once this is done, the bulb is sealed off from the atmosphere. The volume and number of moles of gas can no longer change and the temperature is calculated from the pressure measurement. No Attempt No Attempt 25% Part (a) A particular constant-volume thermometer is calibrated by opening it to...
What is the purpose of the heavy plastic box that’s attached to your laptop charging cable?...
What is the purpose of the heavy plastic box that’s attached to your laptop charging cable? (In terms of electrical current and electricity)
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT