A rocketship7/24/2023 ![]() ![]() The first stage of SpaceX's Falcon 9 rocket has nine engines, while the first stage of Northrop Grumman's Antares rocket has two.Ī rocket's first stage gets the rocket out of the lower atmosphere, sometimes with the help of extra side boosters. Each stage has its own engines, which can vary in number. Today's large, space-bound rockets consist of at least two stages, sections stacked in a shared cylindrical shell. The space shuttle's side boosters used solid propellants, while many modern rockets use liquid propellants. A rocket's fuel and oxidizer-called propellants-can be either solid or liquid. Unlike airplanes' jet engines, rockets are designed to work in space: They don't have intakes for air, and they bring along their own oxidizers, substances that play the role of oxygen in burning fuel. Rockets make exhaust by burning fuel in a rocket engine. As a result, the rocket moves in the opposite direction of the exhaust with the same total oomph. The exhaust's gas molecules don't weigh much individually, but they exit the rocket's nozzle very fast, giving them a lot of momentum. Rockets work by expelling hot exhaust that acts in the same way as the basketball. The faster you throw the ball, the faster you roll backward. If you throw the basketball in one direction, you and the skateboard will roll in the opposite direction to conserve momentum. Imagine yourself standing on a skateboard with a basketball in your hands. If no outside forces act on a group of objects, the group's combined momentum must stay constant over time. Instead, rockets take advantage of momentum, or how much power a moving object has. How do rockets work?Īs tempting as the logic may be, rockets don't work by “pushing against the air,” since they also function in the vacuum of space. These craft and their engines, called rockets, have taken on many roles as fireworks, signal flares, and weapons of war.īut since the 1950s, rockets also have let us send robots, animals, and people into orbit around Earth-and even beyond. ![]() I thought it’d be useful to share it here because it’s a good quote to use when you try to convince top talent to join the startups you invested in.Since the invention of gunpowder in China more than seven centuries ago, humans have sent cylinders soaring into the skies with the help of controlled explosions. Sandberg is not a professional investor, so this quote is not technically a VC quote. Just get on.” Sheryl Sandberg – 2012 HBS Graduation Ceremony If you’re offered a seat on a rocket ship, don’t ask what seat. When companies are growing quickly and they are having a lot of impact, careers take care of themselves. He put his hand on my spreadsheet and he looked at me and said, Don’t be an idiot. “So I sat down with Eric Schmidt, who had just become the CEO, and I showed him the spreadsheet and I said, this job meets none of my criteria. Interesting fact: while Sandberg is generally credited with the rocket ship quote, which she shared at the 2012 Harvard Business School graduation ceremony, former Google CEO Eric Schmidt is the one who gave her the advice first. (Start at 21’30 for the story of how Zuck hired her.) It’s narrated in detail in Reid Hoffman’s Master of Scale podcast.ĭid Sandberg think of this quote when she was offered the job at Facebook in 2008? The move out of Google, where she was in charge of global online sales, occurred after a period of intense meetings between Zuck and Sheryl. ![]() She’s largely credited for turning Facebook into a revenue-generating machine. ![]() Sheryl Sandberg is known as the commercial brilliance behind Mark Zuckerberg’s genius. ![]()
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