In diameters of stars, the relative diameters of the two stars in the sirius system were determined. let’s use this value to explore other aspects of this system. this will be done through several steps, each in its own exercise. assume the temperature of the sun is 5800 k, and the temperature of sirius a, the larger star of the binary, is10,000 k. the luminosity of sirius a can be found in appendix j, and is given as about 23 times that of the sun. using the values provided, calculate the radius of sirius a relative to that of the sun.

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 710 n/m. it is initially at rest on an inclined plane that is at an angle of θ = 23° with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is μk = 0.19. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. a) what is the block's initial mechanical energy? b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

The rigid beam is supported by the three suspender bars. bars ab and ef are made of aluminum and bar cd is made of steel. if each bar has a cross-sectional area of 450 mm2, determine the maximum value of p if the allowable stress is (σallow)st = 200 mpa for the steel and ( σallow)al = 150 mpa for the aluminum. est = 200 gpa and eal = 70 gpa.

What is the measure of a change in an objects velocity?