Jogging Jake runs along the top of a moving flatcar in the direction of motion of the flatcar. If he runs in the opposite direction, the combined momentum of Jake and the flatcar relative to an observer at rest will be

A) more.
B) the same.
C) less.


Answer: C

Physics & Space Science

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A heavy ball hangs by a string, with a second string attached to its bottom. A slow pull on the bottom string breaks the

A) top string. B) bottom string. C) top or bottom string equally.

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Contrast the densities and compositions of the four Galilean moons

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An object weighing 44.1 N hangs from a vertical massless ideal spring

When set in vertical motion, the object obeys the equation y(t) = (6.20 cm) cos[(2.74 rad/s)t - 1.40]. (a) Find the time for this object to vibrate one complete cycle. (b) What are the maximum speed and maximum acceleration of the object. (c) What is the TOTAL distance the object moves through in one cycle. (d) Find the maximum kinetic energy of the object. (e) What is the spring constant of the spring.

Physics & Space Science