please help with the following physics questions. im having a difficult time. thank you in advance.

Q1:

Your response... A(n) 8.84 L vessel contains nitrogen gas at a temperature of 33.1C and a pressure of 0 Boltzmann's constant is 1.38066 x 10'23 J /K. x #1. 5.68 What is the total kinetic energy of the gas? Answer in units of J. PALETTE Your response... What is the average kinetic energy per par- ticle? 0 X #1. 6.34 PALETTE The partial pressure of oxygen in the lungs is 150 mm Hg. This corresponds to a concentration of 5.3 x 1024 molecules/m3. In the oxygen-depleted blood entering the pulmonary capillaries, the concentration is 1.4 x 1024 molecules/m3. The blood is sepa- rated from air in the alveoli of the lungs by a 2 pm thick membrane. What is the rate of transfer of oxygen to the blood through the 5 x 109 m2 surface area of one alveolus? The diffusion coefcient for oxygen in tissue is 1.1 x 10\" m2/s. Answer in units of molecules/s. Your response... PALETTE A gas expands when 654 J of energy is added to it by heat. The expanding gas does 428 J of work on its surroundings. What is the overall change in the internal energy of the gas? Answer in units of J. If the work done by the gas is 976.3 J, how much energy must have been added as heat in order for the change in internal energy at the end of the process to equal the initial change in internal energy? Answer in units of J. #1. 226 Your response... X #1. 976.3 PALETTE If a 52 m steel footbridge experiences Your response... extreme temperatures between -13 .C and 47 C, what is the range in size of this bridge if it measures exactly 52 m at 18.C? (Steel has a coefficient of linear expansion of Previous Responses 1.1 x 10- /C) Answer in units of m. X #1. 51.9823 PALETTEpart 1 of 2 Your response... A nerve impulse is propagated across a synapse when the neurotransmitter acetyl- choline is released from the pre-synaptic mem- Previous Responses brane and diffuses across the 28 nm wide synaptic cleft to the post-synaptic membrane. X #1. 0.0857 How long does it take a nerve signal to cross a synapse? You can assume that the synap- PALETTE tic fluid is essentially water and the Diffusion coefficient is D = 4 x 10-10 m2 /s. Answer in units of s. part 2 of 2 Your response... What is the effective speed of transmission? Answer in units of m/s. PALETTEYou can comfortably hold your fingers close You will burn your fingers if you hold them beside a candle flame, but cannot put your 1. above the flame because of the convection of fingers very close above the flame. hot gases in the flame. Which of the following options is correct? Heat transfer by radiation becomes more im- X 2. portant than convection if you put your fin- gers above the flame. O Heat transfer by radiation is not important 2 when you hold your fingers beside a can- dle flame, but becomes important above the flame. You can hold your fingers quite close to the side of a candle flame without harm because the air between is a good insulator. Above x 4. the flame, however, the air is heated slightly. Since hot air is a poorer insulator than cold air this makes the air above the flame able to carry even more heat causing a runaway cascade effect. Since most candles have upward pointing wicks, this means that their flames are sent 5. with an initial upward velocity, which differ- entially heats the air above the flame more than the air to the side of the flame