You are curious about how the human heart is able to pump blood up to the brain while standing up, considering the blood is flowing against gravity. Suppose that the vertical distance from your heart to your brain is about 39 cm. If, at every heart beat, 0.09 kg of blood is pumped to the brain. What is the amount of work done to this amount of blood by the heart to overcome gravity? Hint, the amount of work equals to the change of gravitational potential energy of this 0.09 kg of blood. (g=9.8 m/s/s) Your Answer: Answer units
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- Problem 1: A farmer is using a rope and pulley to lift a bucket of water from the bottom of a well that is h, = 9.5 m deep. The farmer uses a force F, = 51 N to pull the bucket of water directly upwards. The total mass of the bucket of water is m, + my = 3.7 kg. Select the correct free body diagram. / Correct! Calculate how much work Win J the farmer does on the bucket of water (via the rope) to raise it to ground level. W;= 484.5 / Correct! Calculate how much work W, in J gravity does on the bucket filled with water as the farmer lifts it up the well. W = - 344.8 W = -344.8 / Correct! Part (d) Calculate the net work Wnet in J done on the bucket of water by the two forces F, and F Wnet = 278.37 sin() cos() tan() 7 8 HOME cotan() asin() acos() E 6. acotan() sinh() atan() * 1 2 3 cosh() tanh() cotanh() END ODegrees O Radians Vol BACKSPACE DEL CLEAR Submit Hint Feedback I give up! The answer provided was not correct. We have recognized the following, - Your answer appears to be off by a…A student weighs 150 lbs and walks up a set of stairs from the first floor to the second floor of McLane Hall. Determine the average horsepower exerted by the student if it takes 20 seconds to go up the stairs traveling at a constant speed. Assume the second floor is approximately 8.0 m above the first floor. (Recall that the conversion between pounds and newtons is 1 lb = 4.448 N) 0.36 0.12 0.54 1.21 0.73A bucket of water of mass 20 kg is pulled at constant velocity up to a platform 45 meters above the ground. This takes 18 minutes, during which time 8 kg of water drips out at a steady rate through a hole in the bottom. Find the work needed to raise the bucket to the platform. (Use g=9.8m/s^2) (include units)
- A man starts at ground level and carries a 20 kg box up a flight of stairs to a height of 3.6 m. He then carries the box down an adjacent flight of stairs back to ground level and ends up 10 m away from where he started. What is the total amount of work the man has done? ExplainAt rest, a 59.0 kg cheetah can run at a top speed of 32.7 m/s, according to this video. In terms of net work (in J), how fast can a cheetah reach its maximum speed? A food Calorie is equal to 4186 J. For the cheetah to reach top speed, how many Calories of net work are needed? Cheetah's body produces a lot of energy, yet the amount calculated here is only a small fraction of what it needs.A tank has the shape of an inverted right circular cone with height 9m and radius 18m. It is filled with 5m of hot chocolate. Assume that the density of the hot chocolate is 1450kg/m^3 and g=9.8m/s^2.Find the work required to empty the tank by pumping the hot chocolate over the top of the tank.Work = Joules.
- You go for a walk one afternoon down a level street to a park where there is a hill. If the hill is 62 meters above street level and 4.6 km from home , how much work in the physics sense do you do in order to get to the top of the hill? Assume your mass is 65 kg and the acceleration of gravity is 9.8 m/s. Give your answer in joules (J).Power of the Human Heart. The human heart is a powerful and extremely reliable pump. Each day it takes in and discharges about 7500 L of blood. Assume that the work done by the heart is equal to the work required to lift this amount of blood a height equal to 1.5 m. The density (mass per unit volume) of blood is 1050 kg/m3 . What is the heart's power output. Use g = 9.8m/s2 Calculate answer to one decimal.A bucket begins holding 25 kgs of sand. The bucket is to be lifted to the top of a 20 meter tall building by a rope with density 0.3 kg/m. 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 and rope to the top of the building. Use 9.8 m/s² for gravity.
- A cashier pushes a grocery cart 5m with a horizontal force of 50 N. How much work is done by the cashier on the grocery cart?Suppose you have an ice cream cone full of melted ice cream. The ice cream cone is in the shape of a right circular cone and is 0.5 feet tall with a width (diameter) of 0.25 feet at the top. You decide to drink the melted ice cream using a straw positioned at the top of the cone. How much work is necessary to drink all of the ice cream through the straw? Note that the approximate weight-density of melted ice cream is 64.05 pounds per cubic foot. Round your final answer to 3 decimal places.A bucket of water of mass 15 kg is pulled at constant velocity up to a platform 55 meters above the ground. This takes 8 minutes, during which time 8 kg of water drips out at a steady rate through a hole in the bottom. Find the work needed to raise the bucket to the platform. (Use g = 9.8m/s².) = Work = |