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Which of the following ECG/EKG graphs appears normal?

A.  Calculate stroke volume if end diastolic volume (EDV) is 135 ml/beat and end systolic volume (ESV) is 65 ml/beat. Show your work. Remember to include the units in your answers! Bold or highlight your final answer. B.  Using the necessary numbers from question A, calculate cardiac output (CO) if HR = 65 bpm. Show your work. Remember to include the units in your answers!  Bold or highlight your final answer. 

Why would stroke volume increase if the heart rate slows down?  Explain in 1-3 sentences, please.

An object of 5 kg is moving initially at 4 m/s in the positive x direction. At time t=0, it is acted upon by a force F=(4t+1) N in the positive x direction. What is the velocity of the object at t=5 s?

What is the potential energy associated with a conservative force F(x)=3x^2-1? Please draw the graph of U(x) in your supporting work. Is there a stable equilibrium point for this potential energy?

As in the previous problem, a uniform rod of mass M and length L is pivoted at one end. At L/4 from the other end, a point mass m is attached to the rod. The system is held horizontally. As the rod is let go, find the angular velocity of the system at the moment of passing the vertical position.

A solid disk is mounted so it can rotate without friction about an axis through its center. Initially, it rotates with some angular velocity ω0{“version”:”1.1″,”math”:”ω0″}. A second disk, initially not rotating, is dropped concentrically onto the disk. The second disk has the same mass and half the radius of the first disk. When the two come to a common rotation, what is the final angular velocity?

A body is moving in the positive x direction while being acted upon by a net force. The graph of the net force as a function of the body’s position is represented in the figure below. When the body is at x=0, its speed is 20 m/s. At which of the marked points is the speed of the body the closest to 20 m/s?

A uniform rod of mass M and length L is pivoted at one end. At L/4 from the other end, a point mass m is attached to the rod. The system is held horizontally. As the rod is let go, find the initial angular acceleration of the system.

A body of mass 10 kg is initially at rest on a horizontal surface. The coefficient of static friction between the body and the surface is 0.7, and the coefficient of kinetic friction is 0.4. A horizontal force 50 N is applied to the body. What is the friction force acting on the body?