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Naomi Cavagnaro

Naomi C.

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Many fish maintain buoyancy with a gas-filled swim bladder. The pressure inside the swim bladder is the same as the outside water pressure, so when a fish descends to a greater depth, the gas compresses. Adding gas to restore the original volume requires energy. A fish at a depth where the absolute pressure is 3.0 atm has a swim bladder with the desired volume of $5.0 \times 10^{-4} \mathrm{m}^{3} .$ The fish now descends to a depth where the absolute pressure is 5.0 atm. a. The gas in the swim bladder is always the same temperature as the fish's body. What is the volume of the swim bladder at the greater depth? b. The fish remains at the greater depth, slowly adding gas to the swim bladder to return it to its desired volume. How much work is required?

Many fish maintain buoyancy with a gas-filled swim bladder. The pressure inside the swim bladder is the same as the outside water pressure, so when a fish descends to a greater depth, the gas compresses. Adding gas to restore the original volume requires energy. A fish at a depth where the absolute pressure is 3.0 atm has a swim bladder with the desired volume of $5.0 \times 10^{-4} \mathrm{m}^{3} .$ The fish now descends to a depth where the absolute pressure is 5.0 atm. a. The gas in the swim bladder is always the same temperature as the fish's body. What is the volume of the swim bladder at the greater depth? b. The fish remains at the greater depth, slowly adding gas to the swim bladder to return it to its desired volume. How much work is required?

College Physics: A Strategic Approach

The Lamborghini Huracán has an initial acceleration of $0.75 g .$ Its mass, with driver, is 1510 kg. If an 80 kg passenger rode along, what would the car's acceleration be?

The Lamborghini Huracán has an initial acceleration of $0.75 g .$ Its mass, with driver, is 1510 kg. If an 80 kg passenger rode along, what would the car's acceleration be?

College Physics: A Strategic Approach

While running a marathon, a long-distance runner uses a stopwatch to time herself over a distance of $100 \mathrm{m}$. She finds that she runs this distance in 18 s. Answer the following by considering ratios, without computing her velocity. a. If she maintains her speed, how much time will it take her to run the next $400 \mathrm{m} ?$ b. How long will it take her to run a mile at this speed?

While running a marathon, a long-distance runner uses a stopwatch to time herself over a distance of $100 \mathrm{m}$. She finds that she runs this distance in 18 s. Answer the following by considering ratios, without computing her velocity. a. If she maintains her speed, how much time will it take her to run the next $400 \mathrm{m} ?$ b. How long will it take her to run a mile at this speed?

College Physics: A Strategic Approach

Figure $P 2.15$ shows actual data from Usain Bolt's 2009 word-record run in the $100 \mathrm{m}$ sprint. From this graph, estimate his top speed in $\mathrm{m} / \mathrm{s}$ and in $\mathrm{mph}$.

College Physics: A Strategic Approach

Questions asked

ANSWERED

Gene Schneider verified

Numerade educator

The element radium contains 88 protons. The masses of the neutron, hydrogen atom, and radium-226 isotope are m_n = 1.008665 u , m_H = 1.007825 u , and m_Ra = 226.025403 u. What is the binding energy of the radium-226 isotope? 2100 MeV 1900 MeV 1700 MeV 2300 MeV 2500 MeV

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ANSWERED

Eduard Sanchez verified

Numerade educator

A radioactive isotope of atomic number Z emits a beta-minus particle, and then the daughter nucleus emits a gamma ray. What is the atomic number of the resulting nucleus after both processes? Z-4 Z+1 Z Z-2 Z-1

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ANSWERED

Gene Schneider verified

Numerade educator

The binding energy per nucleon of a nucleus increases steadily as the elements become heavier. decreases steadily as the elements become heavier. has a minimum near iron in the periodic table and then increases for heavier elements. is nearly constant throughout the periodic table. has a maximum near iron in the periodic table and then decreases for heavier elements.

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ANSWERED

Eduard Sanchez verified

Numerade educator

The primary reason that very large nuclei are unstable is due to the cumulative repulsive force between the protons. the extreme weakness of the gravitational attraction of the protons. the repulsive force between neutrons. the attractive force between the protons and the orbiting electrons.

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ANSWERED

Eduard Sanchez verified

Numerade educator

The atomic number Z of an atom is equal to the number of what particles in the nucleus? electrons nucleons protons neutrons positrons

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ANSWERED

Gene Schneider verified

Numerade educator

Question 17 Is the electron configuration [ 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{7} 4 s ] the ground state, an excited state, or a not allowed (impossible) state of an atom? Impossible state. Ground state. Excited state.

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ANSWERED

Eduard Sanchez verified

Numerade educator

A material having a work function of 2.60 eV is struck by photons of wavelength 240 nm. What is the maximum kinetic energy of the emitted electrons? 4.27 eV No electrons are emitted because the incident photons have insufficient energy. 2.57 eV 05.17 eV 2.30 eV

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ANSWERED

Eduard Sanchez verified

Numerade educator

What is the cutoff (threshold) frequency for a metal surface that has a work function of 5.42 eV? 1.31 × 10^15 Hz 2.01 × 10^15 Hz 6.04 × 10^15 Hz 3.01 × 10^15 Hz 5.02 × 10^15 Hz

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ANSWERED

Gene Schneider verified

Numerade educator

What is the wavelength of a photon with energy 7.7 x 10^-19 J? 260 nm 390 nm 350 nm 620 nm 310 nm

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ANSWERED

Eduard Sanchez verified

Numerade educator

If the maximum possible accuracy in measuring the position of a particle increases, the maximum possible accuracy in measuring its velocity will decrease. Increase. remain the same.

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