Homework Statement
String 1 in the figure has linear density 2.4 g/m and string 2 has linear density 3.5 g/m. A student sends pulses in both directions by quickly pulling up on the knot, then releasing it. Consider the pulses are to reach the ends of the strings simultaneously.
In the figure...
Ok I got the answer, its 22,000 Joules.
Part 3 of the question: How many 480 Calorie donuts can she eat a day to supply that energy?
I thought I could just convert the joules to calories by dividing by 4.184, then divide again by 480 to get number of donuts.
Homework Statement
A weightlifter works out at the gym each day. Part of her routine is to lie on her back and lift a 44 kg barbell straight up from chest height to full arm extension, a distance of 0.54 m.
Homework Equations
If the weightlifter does 24 repetitions a day, what total energy...
Homework Statement
Gliders C and D, of masses 2kg and 4kg, respectively, collide on a frictionless track. Glider C initially moves to the right with a speed of .6 m/s relative to the track, while glider D is at rest. After the collision, glider C moves to the left with a speed of .2 m/s...
Homework Statement
Flywheels are large, massive wheels used to store energy. They can be spun up slowly, then the wheel's energy can be released quickly to accomplish a task that demands high power. An industrial flywheel has a 1.5 m diameter and a mass of 250 kg. Its maximum angular velocity...
Yes, so how will the motion of the ruler's center of mass change? And it doesn't matter how small the magnitude of the force applied is, it could still spin forever?
Homework Statement
A ruler is attached to the top of a pole bound by its center (pivot point of the ruler is at its center). A student briefly exerts a downward force on the right end of the ruler. The magnitude of the force exerted by the student is less than the weight of the ruler. Assume...