How much power is needed to lift a 55-kg student vertically upward at a constant speed of 0.44 m/s?

A 75-kg skater begins a spin with an angular speed of 2.0 rad/s. By changing the position of his arms, the skater decreases his moment of inertia to one-fifth of its initial value. What is the skater’s final angular speed?

A 55-kg skater begins a spin with an angular speed of 4.0 rad/s. By changing the position of her arms, the skater decreases her moment of inertia to one-fourth of its initial value. What is the skater’s final angular speed?

A spinning star begins to collapse under its own gravitational pull.  Which one of the following occurs as the star becomes smaller?

A child wants to balance a meter stick pivoted at the 0.50-m line (in the middle).  A 3.0-kg object is hung from the 0.25-m line.  Where should the child hang a 5.0-kg object to achieve equilibrium (the meter stick oriented horizontal and motionless)?

A 0.045-kg ball moving to the right with a speed of 15 m/s is struck by a racket, causing it to move to the left with a speed of 15 m/s.  If the ball remains in contact with the racquet for 0.030 s, what is the magnitude of the average force exerted on the ball?

A planet completes one rotation about the axis passing through its poles in 7.5 × 104 s.  Given this information, what is the angular speed of the planet about its axis?

While transporting an intubated 6-year-old submersion victim to the hospital from a scene, you note the patient’s heart rate changes from 122 to 64 gradually during transport. His skin color was pink and is now pale and cold to the touch. After confirming the endotracheal tube is still in place, what another likely cause for the heart rate change?

You are responding emergency mode to an incident involving a shooting and a police car is providing an escort through heavy traffic. How should you proceed through busy intersections to avoid a collision?

Your transporting a 70-year-old male in cardiogenic shock. He remains hypotensive after 3 boluses of normal saline. Medical control has ordered you to administer dopamine at 5 mcg/kg/min and titriate to systolic blood pressure of 110.  Mr. Lincoln weighs about 165 pounds. Your service carries premixed dopamine of 400mg in a bag of 250 ml. Utilizing microdrip tubing, at what drip rate (drops per minute) will you administer the medication?