Assume the three blocks portrayed in Figure P4.29 move on a frictionless surface and a 42-N force acts as shown on the 3.0-kg block. Determine (a) the acceleration given this system, (b) the tension in the cord connecting the 3.0-kg and the 1.0-kg blocks, and (c) the force exerted by the 1.0-kg block on the 2.0-kg block.
1.1 Our View of the Modern Universe Monday, August 22, 2016 12:57 PM What is our place in the universe • A grand tour of the heavens ○ To survey the universe and the methods astronomersuse to study it ○ To see the measuring units used by real astronomers ○ To assess the scientific method and show how pseudoscience fails scientific tests ○ To boldly go where no class go before • The Universe ○ Some astronomersbelieve that the universe is about 14 billion years old (Maya) ○ The universe is so vast that we are actually receiving light and radio signals from the past ○ Light from the sun takes about 8 minutes ○ Light from the moontakes about 1 second ○ Light travels at a finite speed • A sense
