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# Exam 3 Physics

### Possible questions that may be asked and their answers

Question | Answer |
---|---|

As the station rotates, an astronaut in chamber A is moved 5.57 x 102 m along a circular arc. How far along a circular arc is an astronaut in chamber B moved during the same time? r_A=3.20E2 r_B=1.10E3 | theta_A=s_A/r_A s_B=r_Btheta_B |

Two people start at the same place and walk around a circular lake in opposite directions. One has an angular speed of 1.49 x 10-3 rad/s, while the other has an angular speed of 3.20 x 10-3 rad/s. How long will it be before they meet? | T=2pi/(w_A+w_B) |

The moon diameter of 3.48 x 106 m and distance of 3.85 x 108 m from the earth. The sun diameter of 1.39 x 109 m and is 1.50 x 1011 m from earth. Determine angles(a) the moon and (b) the sun, as measured by a person (c) Determine the ratio moon to sun | a)theta=s/r s=D_M theta_M=9.04E-3 theta_S=9.27E-3 b)theta_S-theta_m=.23mrads |

Suppose the ball spins at 8.16 rev/s. In addition, the ball is thrown with a linear speed of 28.5 m/s at an angle of 47.3 ° with respect to the ground. If the ball is caught at the same height at which it left the quarterback's hand, how many revolutions | (2Sp*V0*sintheta)/9.8=revolutions |

The string length of 53 cm and is wrapped around the top radius is 1.5 cm. an angular acceleration of +10 rad/s2. What is the final angular velocity of the top the string unwound? | A_d=s_l/r (2*A_d*alpha)^1/2=finalomega |

The windmill has 8 blades and rotates at an angular speed of 2.22 rad/s. The opening between successive blades is equal to the width of a blade. A golf ball of diameter 3.20 x 10-2 m. What must be the minimum speed of the ball? | V=2r/deltaT deltaT=deltatheta/omega deltaomega=2pi/16 |