An experimental automobile burns hydrogen for fuel. at the beginning of a test drive, the rigid 30.0-l tank was fi lled with hydrogen at 16.0 atm and 298 k. at the end of the drive, the temperature of the tank was still 298 k, but its pressure was 4.0 atm. (a) how many moles of h2 were burned during the drive? (b) how much heat, in kilojoules, was given off by the combustion of that amount of hydrogen?

When measuring volume, why is it important to use the correct tools and units to attain the greatest accuracy? use specific examples from the lab to support your answer. (5 points)

In an old-fashioned amusement park ride, passengers stand inside a 3.0-m-tall, 5.0-m-diameter hollow steel cylinder with their backs against the wall. the cylinder begins to rotate about a vertical axis. then the floor on which the passengers are standing suddenly drops away! if all goes well, the passengers will “stick” to the wall and not slide. clothing has a static coefficient of friction against steel in the range 0.60 to 1.0 and a kinetic coefficient in the range 0.40 to 0.70. part a what is the minimum rotational frequency, in rpm, for which the ride is safe? express your answer using two significant figures. f f = rpm

If anyonee has done the momentum lab practical in physics can you give me the answers i am s lostt rnn : (