The combination of an applied force and a friction force produces a constant total torque of 36.2 n · m on a wheel rotating about a fixed axis. the applied force acts for 6.20 s. during this time, the angular speed of the wheel increases from 0 to 10.4 rad/s. the applied force is then removed, and the wheel comes to rest in 59.8 s.
(a) find the moment of inertia of the wheel.
(b) find the magnitude of the torque due to friction.
(c) find the total number of revolutions of the wheel during the entire interval of 66.5 s.

Part f - example: finding two forces (part i) two dimensional dynamics often involves solving for two unknown quantities in two separate equations describing the total force. the block in (figure 1) has a mass m=10kg and is being pulled by a force f on a table with coefficient of static friction îľs=0.3. four forces act on it: the applied force f (directed î¸=30â above the horizontal). the force of gravity fg=mg (directly down, where g=9.8m/s2). the normal force n (directly up). the force of static friction fs (directly left, opposing any potential motion). if we want to find the size of the force necessary to just barely overcome static friction (in which case fs=îľsn), we use the condition that the sum of the forces in both directions must be 0. using some basic trigonometry, we can write this condition out for the forces in both the horizontal and vertical directions, respectively, as: fcosî¸â’îľsn=0 fsinî¸+nâ’mg=0 in order to find the magnitude of force f, we have to solve a system of two equations with both f and the normal force n unknown. use the methods we have learned to find an expression for f in terms of m, g, î¸, and îľs (no n).

What do the atoms of elements in the same group have in common? a. they have the same atomic numbers. b. they have the same average atomic masses. c. they have the same number of electron shells. d. they have the same number of electrons in their outermost shells.

How does the strength of the electrostatic force between an electron and a proton compare to the strength of the gravitational force between them?