A chunk of brass with mass 0.6 kg, with specific heat 380 J/(kg·K), and with temperature 400 K is placed in 0.6 kg of water, withspecific heat 4186 J/(kg· K), and with temperature 280 K. The waterand the brass are in an insulated container and come to thermalequilibrium. Find the final temperature in kelvins (closestanswer).
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The asteroid Oumuamua observed this year in November traveledaround the sun at a speed of 87,500 m/s. Its proper length is 180m. How much does a stationary observer near the sun measure itslength to be changed at this speed due to relativity? A positiveanswer means its length is measured to be increased and a negativeanswer means that its length is measured to be decreased. (Inmicrometers, closest answer.)
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A radioactive sample is measured to be emitting 200 alphaparticles per second. 20 minutes later it is emitting only 126alpha particles per second. The half life of the unstable nucleusthat is emitting these particles is - (in minutes, closestanswer)
