How Things Work: An Introduction to Physics week 3

In this blog you will find the correct answer of the Coursera quiz How Things Work: An Introduction to Physics week 3 mixsaver always try to brings best blogs and best coupon codes

Week- 3

Falling Balls


1. Which force is your weight? [The force that is your weight and not a force that is equal to your weight.]


2. You visit a bowling alley and examine the bowling balls that are available for use. They all look identical, but some are heavier (have greater weights) than others. How can you identify the heaviest ball? [Neglect any effects due to air]


3. You are traveling on an intergalactic cruise spaceship in deep, gravity-free space. You find that the ship has a bowling alley! Once again, there are many identical-looking balls available for use. Without gravity, however, they all have the same weight: zero.

While still on the spaceship in deep, gravity-free space, how can you identify the ball that will be heaviest when your cruise ship lands on a planet and gravity is present? [Neglect any effects due to air]


4. You’ve learned to juggle 4 balls at once here on Earth. During a visit to the moon, where the acceleration due to gravity is about 1/6th its Earth value, you decide to try juggling those same 4 balls. You find that, on the moon, each ball has ________________.


5. While vacationing on a tropical island, you find the courage to step off a high cliff and fall for 4 seconds before entering the water below. Exactly 2 seconds into your fall, you glance at the cliff face and see a secret treasure embedded in the rock. When you recover from your plunge, you return to the cliff top and find that treasure ______________________.


6. You are playing basketball and take a shot toward the basket. When the ball is midway to the basket and nothing is touching the ball, what is the direction of the net force on the basketball? [Neglect any effects due to air]


7. You throw a handful of different coins up and forward and watch them arc through space. They leave your hand at the same moment and with the same starting velocity. Neglecting any effects due to air, where and when do those coins hit the level ground in front of your feet? [Note: air can significantly affect fast-moving coins. If you want to test your answer experimentally, be careful to minimize those air effects. Also, be safe!]


8. You throw a priceless porcelain vase straight up and watch as it rises to peak height and then drops safely back into your hands. Fortunately, the vase’s owner wasn’t watching. What were the vase’s velocity and acceleration at the moment it reached peak height? [Do not test your answer experimentally, unless you take full responsibility for any consequences!]


9. When an archer sends an arrow toward a target, the archer must aim the arrow above the target’s bullseye (its center) in order for the arrow to hit that bullseye. If the archer uses a stronger bow and therefore a faster-moving arrow, how will that change how the archer aims the arrow in order to hit the same target’s bullseye? [Neglect any effects due to air]


10. As you collect plastic bottles for recycling, one of the bottles rolls horizontally off the kitchen counter and bounces on the floor about 1 foot (0.3 meters) outward from the base of the counter. Why didn’t the bottle drop straight down and hit the floor exactly at the base of the counter?





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