Problem: Write an article based on this summary: Warm up first with cardio and moderate resistance exercises. Start with basic pull-ups. Practice the muscle-up movements on the ground. Practice kipping pull-ups. Get used to doing the muscle-up on the pull-up bar before you try it on the Olympic rings.

Answer: You can run, do jumping jacks, march in place, or work on the elliptical for 15 minutes. Moderate resistance exercises, like lateral pull downs or cable rows, can also help you warm up the muscle groups needed for this exercise. A basic pull-up will help you build the muscles you need to master the muscle-up. Basic pull-ups can be performed in a few different ways with different grips and hand placement. Begin at a dead hang. Your arms should be extended and your feet should be off the ground. You may have to cross your feet at the ankle and pull your legs up so your shins are parallel to the ground. For a traditional pull-up you will grip the bar with an overhand grip. Your hands should be wider than your shoulders. Engaging your core, pull up until the bar reaches your chin level. Pause, and then repeat. For a chin-up, you will grip the bar with an underhand grip, so your fingers face you. Then pull up the same way you would for an overhand pull-up until the bar reaches your chin. Wide grip pull-ups will engage your upper lats while chin-ups engage more of your lower lat region, middle back, and biceps. Both styles will prepare you for perfect muscle-ups. Feel free to add extra weight with dumbbells or kettle bells locked between your feet. More weight will prepare you for a muscle-up. The hardest muscle-up to achieve is when the Olympic rings are hanging above you. To master this muscle-up, you may want to start with the rings lower to the ground. Lower the Olympic rings so that the rings allow your feet to touch the ground. Grip the rings and fully extend your arms. Then practice swinging and throwing your head and chest through the middle of the rings while keeping your elbows tight. By lowering the rings closer to the floor you are essentially performing the second part of the muscle-up. This kind of training allows you to easily get into the part of the muscle-up position after you've raised yourself up. This technique allows you to work and build the muscles needed for the muscle-up. It also trains your body to use correct form and movement, developing good muscle memory. This is also a great time to practice your dips, something you need to master to perform a well-executed muscle-up. Grip the rings with a false grip and extend your arms. Lift your feet off the ground and perform several dips. Kipping pull-ups are a more advanced form of the pull-up that involve you swinging your body back and forth. The swinging allows you to gain momentum to pull yourself up over the bar. Begin practicing your kipping pull-ups by taking the time to process through each move properly before doing the pull-up. When you swing forward you want your head to be forward in front of the bar. Your shoulders, hips, and legs should be curving back behind the bar. When swinging backward you want your hips to pop up and forward with your head behind the bar. When you've reached the apex of height on your hip pop, pull up and in to get your chin above the bar. Then push out slightly to engage your downward swing. Keep your grip slightly relaxed. You don't need to squeeze the bar extremely hard. You want a relaxed grip to allow for fluid movement. Performing a muscle-up on the bar is easier than on the rings. So get used to doing muscle-ups on the bar first. You will want to practice your dips on the bar as well. Doing your exercises on the bar will help you build muscle and form. Since the bar is more stable than the rings it offers you a better platform to learn on. Once you feel confident on the bar, move onto the lowered Olympic rings. After you feel confident with the lowered rings, you can raise the rings. Then practice your muscle-up on the higher rings.

Problem: Write an article based on this summary: Define the equation for average acceleration. Understand the variables. Use the formula to find acceleration.

Answer: You can calculate the average acceleration of an object over a period of time based on its velocity (its speed traveling in a specific direction), before and after that time. To do this you need to know equation for acceleration: a = v / t where a is acceleration, v is the change in velocity, and t is the amount of time it took for that change to occur. The unit for acceleration is meters per second per second or m/s2. Acceleration is a vector quantity, meaning it has both a magnitude and a direction. The magnitude is the total amount of acceleration whereas the direction is the way in which the object is moving. If it is slowing down the acceleration will be negative. You can further define v and t: v = vf - vi and t = tf - ti where vf is the final velocity, vi is the initial velocity, tf is the ending time, and ti is the starting time. Because acceleration has a direction, it is important to always subtract the initial velocity from the final velocity. If you reverse them, the direction of your acceleration will be incorrect. Unless otherwise stated in the problem, the starting time is usually 0 seconds. First write down your equation and all of the given variables. The equation is a = v / t = (vf - vi)/(tf - ti). Subtract the initial velocity from the final velocity, then divide the result by the time interval. The final result is your average acceleration over that time. If the final velocity is less than the initial velocity, acceleration will turn out to be a negative quantity or the rate at which an object slows down. Example 1: A race car accelerates uniformly from 18.5 m/s to 46.1 m/s in 2.47 seconds. What is its average acceleration? Write the equation: a = v / t = (vf - vi)/(tf - ti) Define the variables: vf = 46.1 m/s, vi = 18.5 m/s, tf = 2.47 s, ti = 0 s. Solve: a = (46.1 18.5)/2.47 = 11.17 meters/second2. Example 2: A biker traveling at 22.4 m/s comes to halt in 2.55 s after applying brakes. Find his deceleration. Write the equation: a = v / t = (vf - vi)/(tf - ti) Define the variables: vf = 0 m/s, vi = 22.4 m/s, tf = 2.55 s, ti = 0 s. Solve: a = (0 22.4)/2.55 = -8.78 meters/second2.

Problem: Write an article based on this summary: Learn the basic components of an electric guitar. Decide what kind of body style you want. Learn a bit about tone woods. Look to your guitar heroes for inspiration. Don't be afraid of deals.

Answer:
Like an acoustic guitar, an electric is basically just strings that vibrate over wood, but with the addition of all kinds of confusing-looking selector switches and knobs. Learning to identify the basic components of electric guitars can help demystify the process and help you focus on the most important parts. Pick-ups will be placed under the strings near when the guitar is plucked. There may be as few as one pick-up and as many as three or four, depending on the guitar. These are used to pick up the sound of the guitar, which vibrates an internal magnetic coil, producing an electric signal that travels through the amplifier. Volume knobs will be included, sometimes as many as three. These allow you to adjust the output volume of the guitar. Tone knobs are used to toggle between the high and low frequencies in the pick-up. There are usually different tone knobs for each pick-up in the guitar. Selector or cut-off switches are used to select between the individual pick-ups and activate them, or cut them off. On most guitars you can use some combination of different pick-ups. The output jack is usually on the back-end of the guitar, or the bottom lip, where the guitar is plugged in to the amplifier via quarter-inch cable. To the untrained eye, all electric guitars might look basically the same, but body styles can be broken into several basic categories, each with its own subtleties of sound and playing style. Some body styles work better for certain genres, though there's no rule that says so. Lots of it has to do with your personal playing style and the music you want to make. Solid body guitars are sturdy and weighty, made of a single piece of wood. Because there's no resonance chamber, solid-body guitars must be played through amplifiers. The variety of pick-ups and the electronics of a solid-body guitar are very important. These are the go-to guitars for rock 'n roll, punk, and metal music. Famous solid-body guitar styles include the Fender Stratocaster and the Gibson Les Paul. Hollow body electric guitars are, as the name suggests, hollow on the inside of the body. While there's no sound hole as will be found on an acoustic guitar, hollow-body electric guitars will often use a different variety of pick-up than a solid-body guitar. These are often used for playing jazz, featuring a warm and deep mid-range, and work best with mellow, low-volume amplifiers. Semi-hollow body electric guitars are hybrid models that feature a cut-out design and a small hollow portion of the body. These guitars have a bright and chime-like tone that's perfect for country music, folk-rock, and for lead-guitar work. The Rickenbacker and the Gibson ES are famous semi-hollow guitar models. Electric-acoustic guitars look basically like acoustic guitars, but feature pick-ups that allow them to be played like electric guitars. While these typically will have fewer features than other forms of electric guitars, electric-acoustics offer the versatility of playing them without the use of amplification. Primarily, the sound of a given electric guitar will come from the pick-up, though the pick-ups of a guitar can be changed out, customized, and upgraded. For a reason, it's important to give some consideration to the wood that the guitar is made from, but beginners will likely not notice a huge difference in sustain, so try not to be led down a garden-path by a salesman telling you that you have to upgrade to koa wood. Still, it's good to learn a bit about the different types of woods used to demystify the process. Most bodies are made of maple, mahogany, or poplar. Maple is known for its long sustain and bright character, while mahogany is known for its warmth. Poplar is great for bright and crispy high-register tone. Let's face it, the number one reason most people end up picking the guitar they pick is because it looks cooler than all the others. This is a perfectly legitimate reason to pick a guitar. Almost every guitar player who ever picked up an axe did so because they saw some other guitar player who looked awesome standing on stage. Famous Gibson Les Paul pickers include Jimmy Page, Zakk Wilde, Slash, Randy Rhoads, and Bob Marley. Famous Fender Stratocaster players include Jimi Hendrix, Eric Clapton, Buddy Guy, and Stevie Ray Vaughn. Other iconic guitar models include the Gibson SG, played by Angus Young, the Fender Telecaster, played by Bruce Springsteen, the Gibson Flying V, played by Kirk Hammett, and the Fender Jazz Master, played by Kevin Shields, Elvis Costello, Thurston Moore, and J Mascis. Gearheads often fall into the same trap, thinking that super-expensive and obscure gear is also better than cheaper industry standard stuff. Sometimes, this is the case, but if you're looking for a guitar to learn on, don't judge by the price. There are expensive guitars that have the resonance of a brick, and there are cheap guitars that really sing. Old Fenders that sell for thousands of dollars today started out life as inexpensive solid body guitars. By the same token, if you're going to invest in a guitar to learn on, you need to get something that's worth playing. Toy guitars sold at places like Walmart aren't even worth the low price tags offered. It's better to go for a used guitar or a cheaper model of the guitar you want. Fender offers the "Squire" series, using somewhat cheaper materials, but the same designs as their other more expensive guitars. You can get a Squire Strat for around $300, compared with the $1400 it might cost for an American Stratocaster, if you're lucky. Explore used guitars and do your research to find deals. Some players will only play guitars that have been broken in a bit and worked over by other players. Neil Young is known for only playing old guitars, for example, and never plays new ones.