Which of these is an example of a physical change? a. sugar dissolving in warm waterb. iron rusting in the presence of moist airc. wood burning in the presence of oxygend. baking soda reacting with acid to form a gas

Ogle–2013–blg–0723 is an exoplanet that is similar to earth in size and proximity to its star. this exoplanet has mass m=4.18×1024kg and radius r=5.66×106m. an astronaut whose weight on earth is w=735n lands on the planet. a. calculate m, the mass of the astronaut. b. calculate gp? , the acceleration due to gravity on the surface of ogle–2013–blg–0723. c. calculate wp? , the weight of the astronaut on the surface of ogle–2013–blg–0723. d. calculate v, the minimum velocity required to put an object into orbit above ogle–2013–blg–0723. e. calculate t, the time required to complete an orbit around ogle–2013–blg–0723.

Sort the images based on whether there's a force of attraction or repulsion between the magnets shown. attraction repulsion

Wind and moving water provide energy. question 1 options: chemical mechanical thermal none of the above