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Ten cars in a circle at a boom box competition produce a 120-dB sound intensity level at the center of the circle. What is the average sound intensity level produced there by each stereo, assuming interference effects can be neglected?

Ten cars in a circle at a boom box competition produce a 120-dB sound intensity level at the center of the circle. What is the average sound intensity level produced there by each stereo, assuming interference effects can be neglected?

College Physics for AP® Courses

If a Carnot engine has an efficiency of 0.23 , what is its coefficient of performance if it is run backward as a heat pump?

If a Carnot engine has an efficiency of 0.23 , what is its coefficient of performance if it is run backward as a heat pump?

Physics

A $0.20-\mathrm{kg}$ stone is held 1.9 $\mathrm{m}$ above the top edge of a water well and then dropped into it. The well has a depth of 5.0 $\mathrm{m} .$ Taking $y=0$ at the top edge of the well, what is the gravitational potential energy of the stone-Earth system (a) before the stone is released and (b) when it reaches the bottom of the well. (c) What is the change in gravitational potential energy of the system from release to reaching the bottom of the well?

A $0.20-\mathrm{kg}$ stone is held 1.9 $\mathrm{m}$ above the top edge of a water well and then dropped into it. The well has a depth of 5.0 $\mathrm{m} .$ Taking $y=0$ at the top edge of the well, what is the gravitational potential energy of the stone-Earth system (a) before the stone is released and (b) when it reaches the bottom of the well. (c) What is the change in gravitational potential energy of the system from release to reaching the bottom of the well?

College Physics

A 1.9-kg rock is released from rest at the surface of a pond 1.8 $\mathrm{m}$ deep. As the rock falls, a constant upward force of 4.6 $\mathrm{N}$ is exerted on it by water resistance. Calculate the nonconservative work, $W_{\mathrm{nc}}$ done by water resistance on the rock, the gravitational potential energy of the system, $U,$ the kinetic energy of the rock, $K,$ and the total mechanical energy of the system, $E,$ when the depth of the rock below the water's surface is (a) $0 \mathrm{m} (\mathrm{b}) 0.50 \mathrm{m},$ and $(\mathrm{c}) 1.0 \mathrm{m} .$ Let $y=0$ be at the bottom of the pond.

A 1.9-kg rock is released from rest at the surface of a pond 1.8 $\mathrm{m}$ deep. As the rock falls, a constant upward force of 4.6 $\mathrm{N}$ is exerted on it by water resistance. Calculate the nonconservative work, $W_{\mathrm{nc}}$ done by water resistance on the rock, the gravitational potential energy of the system, $U,$ the kinetic energy of the rock, $K,$ and the total mechanical energy of the system, $E,$ when the depth of the rock below the water's surface is (a) $0 \mathrm{m} (\mathrm{b}) 0.50 \mathrm{m},$ and $(\mathrm{c}) 1.0 \mathrm{m} .$ Let $y=0$ be at the bottom of the pond.

Physics

Questions asked

ANSWERED

Supratim Pal verified

Numerade educator

Container A contains 0.055g of nitrogen (N2) gas. Container B contains 8.25g of carbon dioxide (CO2) gas. The molecular masses for nitrogen and carbon dioxide are 28.0g/mol and 44.0g/mol, respectively. a) How many moles of nitrogen gas are in container A? b) How many moles of carbon dioxide gas are in container B? c) What is the number of nitrogen molecules in container A. d) What is the number of molecules of carbon dioxide in container B?

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ANSWERED

Timothy James verified

Numerade educator

At very low temperatures, molecular speeds can still be large. The table below shows mass and temperature data for three different gases. The specified temperatures are each one degree above the boiling point for the substance. gas symbol m(kg) T(K) hydrogen H2 3.32×10−27 21.28 helium He 6.65×10−27 5.22 oxygen O2 5.31×10−26 91.19 a) What is the rms speed. in meters per second, for atoms of helium gas at the temperature specified in the table? b) What is the ratio of the rms speed of the hydrogen molecules to that of the oxygen molecules? (Calculate each at its respective temperature from the table.)

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ANSWERED

Aparna Shakti verified

Numerade educator

n = 3.4 moles of an ideal gas are pumped into a chamber of volume V = 0.075 m3. Randomized Variables n = 3.4 moles V = 0.075 m3 a) The initial pressure of the gas is 1 atm. What is the initial temperature (in K) of the gas? b) The pressure of the gas is increased to 10 atm. Now what is the temperature (in K) of the gas?

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ANSWERED

Ankur S verified

Numerade educator

A closed system holds 1.55 liters of gas at 7.2×107 Pa. The temperature of the gas has a constant value of 45.9∘C. Find the number of moles of gas in the closed system.

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ANSWERED

Timothy James verified

Numerade educator

A 0.55-liter bottle is heated using a burner. When the air inside the bottle reaches 80.0∘C, the pressure in the bottle is at 1.00atm because the bottle is open to the atmosphere. The burner is turned off, and a pealed, hard-boiled egg is placed on the mouth of the bottle. As the bottle cools, there is a pressure difference between the inside and outside that pulls the egg into the bottle. a) at the instant that the flame is turned off, how many moles of air are inside the bottle? b) as the air inside cools to 24∘C, what is the gauge pressure, in pascals, inside the bottle?

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ANSWERED

Aparna Shakti verified

Numerade educator

Blood is flowing through an artery of radius 1.8 mm at a speed of 44 cm/s. a) Determine the flow rate through the artery, in cubic centimeters per second. b) Determine the volume, in cubic centimeters, that passes through the artery in a period of 30.0 s.

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ANSWERED

Timothy James verified

Numerade educator

Consider a 0.52-m-wide by 0.815-m-long gas tank that can hold 49.5 kg of gasoline. What pressure, in newtons per square meter, is exerted on the bottom of the gas tank by the weight of the gasoline in it when it is full?

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ANSWERED

Timothy James verified

Numerade educator

C d A B ©theexpertta.com

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ANSWERED

Narayan Hari verified

Numerade educator

Suppose a hydrometer having a density of 0.750 g/mL floats in a liquid with 93 % of its volume submerged. Find the density of the fluid, in kilograms per cubic meter.

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ANSWERED

Justin Swantek verified

Numerade educator

The pressure drop along a length of artery is 102 Pa, the radius is 7.5 mm, and the flow is laminar. The average speed of the blood is 12 mm/s. Randomized Variables P = 102 Pa r = 7.5 mm s = 12 mm/s What is the net force on the blood in this section of artery in N? What is the power expended maintaining the flow in mW?

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