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- Consider these scenarios and state whether work is done by the system on the environment (SE) or by the environment on the system (ES): (a) opening a carbonated beverage; (b) filling a flat tire; (c) a sealed empty gas can expands on a hot day, bowing out the walls.0. 31 : The work done in blowing a soap bubble from radius (r) to (2r) is : (a) 4tr'T (b) 12r'T (c) 8trT (d) 24 tr'TA) A bucket full of sand has a mass of 15 kg (including the bucket and the sand). The bucket is to be lifted to the top of a building 30 meters tall by a rope of negligible weight. However, the bucket has a hole in it, and leaks 0.3 kgs of sand each meter it is lifted.Find the work done lifting the bucket to the top of the building. B) A bucket that has a mass of 20 kg when filled with sand needs to be lifted to the top of a 25 meter tall building. You have a rope that has a mass of 0.1 kg/m that must be secured to the bucket. It takes 1 meter of rope to secure the bucket. Once the bucket reaches the top of the building it only has mass 16 kg because there was a hole in the bottom and sand was leaking out at a constant rate while it was being lifted to the top of the building.Find the work done lifting the bucket (sand and rope) to the top of the building.
- A system is taken from the state A to the state B along two possible paths: path 1 and path 2. See picture. Along which path is the work done by the system greater? چشم A PATH 1 PATH 2A spherical tank of diameter 6 m is full of water. Set-up the integral for the work done in pumping all the content to a point 1 m from the top of the tank. O 9800 T πS² (y ³- (3-13y² +42y)dy O 9800T Sº (7-y)(6y-y²)²dy 9800T S (7-y)√√6y-y²dy 9800 T S² (7 (7-y)√6y-y²dy OA machinist polishes a 0.50-kg copper fitting with a piece of emery cloth for 2.0 min. He moves the cloth across the fitting at a constant speed of 1.0 m/s by applying a force of 20 N, tangent to the surface of the fitting. (a) What is the total work done on the fitting by the machinist? (b) What is the increase in the internal energy of the fitting? Assume that the change in the internal energy of the cloth is negligible and that no heat is exchanged between thefitting and its environment. (c) What is the increase in the temperature of the fitting?
- Should You Walk or Run? It is 5.0 km from your home to the physics lab. As part of your physical fitness program, you could run that distance at 10 km/h (which uses up energy at the rate of 700 W), or you could walk it leisurely at 3.0 km/h (which uses energy at 290 W). Which choice would burn up more energy, and how much energy (in joules) would it burn? Why does the more intense exercise burn up less energy than the less intense exercise?In the figure, a 1.4 g ice flake is released from the edge of a hemispherical bowl whose radius r is 21 cm. The flake-bowl contact is frictionless. (a) What is the speed of the flake when it reaches the bottom of the bowl? (b) If we substituted a second flake with 3 times the mass, what would its speed be? (c) If, instead, we gave the flake an initial downward speed 1.4 m/s along the bowl, what would the answer be? Ice flake-Ball shot into sand. A steel ball with mass m = 5.2 g is fired vertically downward from a height h₁ of 18 m with an initial speed vo of 14 m/s. It buries itself in sand to a depth h₂ of 21 cm. (a) What is the change in the mechanical energy of the ball? (b) What is the change in the internal energy of the ball-Earth-sand system? (c) What is the magnitude Fave of the average force on the ball from the sand?
