The Kilauea volcano in Hawaii is the world’s most active, disgorging about 5×10^5m3 of 1200ºC lava per day. What is the rate of heat transfer out of Earth by convection if this lava has a density of 2700kg/m3 and eventually cools to 30ºC ? Assume that the specific heat of lava is the same as that of granite.

An astronaut floating in space is trying to use her jetpack to get back to her space station, but she is being pulled away by a nearby planet, as shown in the image below. her jetpack provides a constant thrust of 310 n. if she angles her jetpack in such a way that it cancels out the vertical force due to the planet's gravity, what is her net horizontal force? thaud 487 o a. 54.8 n toward the space station o b. 212.9 n toward the space station o c. 185.2 n toward the space station o d 956 n toward the space station