Light travels at a speed of close to 3 x 10^5 km/s in vacuum. given that it takes light 8 min and 19 s to travel the distance from the center of the earth to the center of the sun, how far away is the sun from the earth? (astronomers use this as a "distance unit" called 1 astronomical unit or 1 au)

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant

Abookcase has a mass of 38 kg and the coefficient of friction between it and the floor is 0.82 what is the maximum force of friction between the bookcase and the floor a 372n b 305n c 412n d 449n

Wo small variable-thrust jets are actuated to keep the spacecraft angular velocity about the z-axis constant at ? 0 = 1.16 rad/s as the two telescoping booms are extended from r1 = 1.18 m to r2 = 4.69 m at a constant rate over a period of 124 seconds. the small 19-kg experiment modules at the ends of the booms may be treated as particles, and the mass of the rigid booms is negligible. determine the necessary thrust t for each jet as a function of time where t = 0 is the time when the telescoping action is begun. after you have the general expression for t, answer the questions. show work.