Q. A 20.0 g ball is fired horizontally with initial speed v_0 toward a 110 g ball that is hanging motionless from a 1.10 m-long string. The balls undergo a head-on, perfectly elastic collision, after which the 110 g ball swings out to a maximum angle theta_max = 50.0^circ.

Q. A tuning fork produces a sound with a frequency of 238 Hz and a wavelength in air of 1.44 m. What is the temperature of the air?

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What is the temperature of the air : A 20 g ball is fired horizontally with initial speed v_0 toward a 110 g ball that is hanging motionless from a 1.10 m-long string. The balls undergo a head-on, perfectly elastic collision, after which the 110 g ball swings out to a maximum angle t.. |

Explain why do we consider a business-cycle expansion : Explain why do we consider a business-cycle expansion different from long-run economic growth. Why do we care about the size of the long run growth rate of real GDP versus the size of the growth rate of the population. |

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## What is the acceleration of a bodyIf she is served 200 of coffee at 85 in a well-insulated container, how much ice at 0 must she add to obtain a final temperature of 33. |

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## The distance also decreases by a factor of 2Giancoli, page 30 --when they say that x-xo increases with the square of the initial speed. Why do they say square of initial speed only, what about square of final speed? And why do they ignore that the distance also decreases by a factor of 2. |

## What is the velocity of the boatAt time t=0 a grinding wheel has an angular velocity of 28.0 rad/sec. It has the constant angular acceleration of 35.0 rad/sec^2 until a circuit breaker trips at time t=1.80. From then on, the wheel turns through an angle of 433 as it coasts to the s.. |

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