The heart does about 1 Joule of work while pumping blood into the aorta during each heartbeat. a. Estimate the work done by the heart in pumping the blood in a lifetime. b. If all of that work was used to lift a person, to what height could an average person be lifted? (Show your work used to answer this question)
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- A 60.0 kg skier with an initial speed of 15 m/s coasts up a 2.50 m high rise as shown in the figure. what is her final speed given the coefficient of friction between her skies and the snow is 0.398A 7.80 g bullet is initially moving at 650 m/s just before it penetrates a tree trunk to a depth of 4.70 cm. (a) What is the magnitude of the average frictional force (in N) that is exerted on the bullet while it is moving through the tree trunk? Use work and energy considerations to obtain your answer. b) Assuming the frictional force is constant, how much time (in s) elapses between the moment the bullet enters the tree trunk and the moment it stops moving?
- 3. In this question you will do some algebra to determine two relations that you will need for Part 2 of this lab. Write down Eq. 11 twice. In the first statement, set the rotational kinetic energy term equal to zero (i.e. lw? = 0) –- call this your "No Krot model". Leave the second as it is written in Eq. 11– call this your "Krot model". For both models, solve for v in terms of g, h, and a. In the Krot model, you will need to use I (Eq. 3) and w = KMR2 /r. The solution for the Krot model will have a k term as well. Once you have solved for v, use the kinematic relation, v = and the trigonometric relationship, h both models separately. at, = L sin 0, solve for t for NOTE: L is the length of the incline plane. NOTE: a is different for the two models (refer to the "Rotational Mechanics" discussion in the introduction): In the "No Kpot model", a = g sin 0 (remember the Newton's 2nd Law lab) In the "Krot model", a is given by equation 8 These two solutions represent the predicted time it…9. A train glides along the track without the assistance of any motor and with a negligible amount of friction. A work-energy bar chart shows the energy of the train-Earth system at moments one and two. Eki Egl Wext Ek2 Egz 0 y=0 (a) Draw the position of the rollercoaster on the track at moments one and two. Label each moment. (Note, there are many possible answer (b) Explain how you chose the positions at those moments in time by referring to details in the bar chart.A pendulum with a light string and a mass attached to it. As the pendulum swings downward. What is the work done by the strings tension on the mass (+, - or 0) and why?
- A mechanic pushes a m=2300 kg car from rest. He does W=4850 J of work in the process. During this time the car moves d327 m. Neglect the friction to answer the following questions. What is the horizontal force exerted on the car? Units: What is the velocity of the car at the final distance? Units:4. Here we prove a version of the work-kinetic energy theorem for an object moving in 1-D subject to a constant force. Consider a mass m, traveling initially at speed v, on which a constant net force F is applied in the same direction as its motion over a distance d. After the net force has acted over this distance, the speed of the object is v2. In terms of m, F, v1, v2, and d only, V, A) What is the acceleration of the mass? t=0 m F d t>0_m B) What is the time over which the mass travels the V, distance d? [Use one equation of constant acceleration to find this.] C) Use another equation of constant acceleration to relate m, F, v,, v2, and d. Show that the product W = Fd is equal to the change in the mass’s kinetic energy.A 68.3-kg skier coasts up a snow-covered hill that makes an angle of 25.5 ° with the horizontal. The initial speed of the skier is 9.77 m/s. After coasting a distance of 1.45 m up the slope, the speed of the skier is 3.60 m/s. (a) Find the work done by the kinetic frictional force that acts on the skis. (b) What is the magnitude of the kinetic frictional force? (a) Number i (b) Number i Units Units 0
- Common speech often uses the term "work" to refer to situations where, according to the physics definition of work, there is no actual work done. Find an example of this and explain why the non-physics public considers this work and what a proper physics response would be to this error. You must use ordinary language in an attempt to clarify what is happening do not rely on trigonometry or scalar dot products in you answer . Some examples you could consider include a person pushing on a wall and the wall not moving, a person doing a "bench seatisometric exercise where they squat against a wall, the moon being pulled by gravity as it orbits the earth, etc.A 1,060 kg meteor strikes the surface of the Moon. What is the work done (in J) on the meteor by the gravitational field of the Moon, if we assume the meteor comes from deep space? The work done by the Moon's gravitational field is equal to the negative of the change of potential energy of the meteor-Moon system. You can assume the meteor comes from infinitely far. What is the final distance of the meteor, if it lands on the Moon's surface? You will need to look up two physical characteristics of the Moon to solve this problem. J1. A 1000 kg car is driving forward with a speed of 25 m/s. It comes to rest in a distance of 100m. a) What is its change in kinetic energy during this process? ANSWER: b) What was the magnitude of the net force needed to bring the car to rest over that distance? ANSWER: