MIME-Version: 1.0 Content-Location: file:///C:/D9286902/Fall05.Phys3650.Quiz1.SolutionWeb.htm Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="us-ascii" Department of Natural Sciences

Department = of Natural Sciences

Clayton State University

 

 

September 7, = 2005

Physics 365= 0 – Quiz 1

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Name  ___SOLUTION__________________________________

 

 

 

1. A neon = sign in front of a cafe flashes on and off once every 5.00 s, as measured by the head cook. How much time elapses between flashes of the sign as measured by= an astronaut in a spaceship moving toward Earth at a speed of 0.840c?

Dt =3D Dtp / (1-v2/c2)1/2

 Dt =3D (5.00 s) / (1-(0.840c)2/c2)1/2 =3D 9.22 s

2. A recta= ngular painting is 124 cm wide and 80.5 cm high. At what speed, v, must the painting move parallel to its width if it is to app= ear to be square?

DL =3D DLp (1-v2/c2)1/2            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;

 (DL / DLp)2 =3D  1-v2/c2

v2= =3D c2 (1 – (DL / DLp)2)

v =3D c= (1 – (DL / DLp)2)1/2 =3D 0.761c

&n= bsp;

&n= bsp;

&n= bsp;

&n= bsp;