A cabel is pulling a box with mass 300 kg on a horizontal plane. The cabel acts 60° on the direction of movement of the box. If the tension in the cabel is 1000 N and
the box is moved for 4.5 m, calculate the work done to move the box.

The brightest star in the night sky in the northern hemisphere is sirius. its distance from earth is estimated to be 8.7 light years. a light year is the distance light travels in one year. light travels at a speed of 3.00 × 108 m/s. calculate the distance from earth to sirius in miles. (1 mi = 5280 ft) g