1. (15 mins
An arrow is fired directly horizontal off a cliff that is 10.0 meters tall with a velocity of 65.5 m/s,
how long is the arrow in the air?
(a) 14 s
(b) 1.38 s (c) 1.43 s
2. Approximately how far will an object near Earth's surface fall in 3.0 s?
(a) 9.8 m (b) 44 m (c) 22 m
3. A bullet is fired at an angle of 45º. Neglecting air resistance, what is the direction of
acceleration during the flight of the bullet?
(a) At a 45° angle (b) upward
(d) downward
4.
In the absence of air resistance, the horizontal component of velocity for a projectile such as a
bullet is (a) variable (b) remain constant (c) change
5. The projectile follow (a) straight path (b) upward (c) curved path in the air.

Dinate system, and a charge q = - 2.00 nc is placed s2 10 n> c. (a) what is the change in electric potential energy when the dipole moment of a molecule changes its orientation with respect to es from parallel to perpendicular? (b) at what absolute temperature t is the average translational kinetic energy 32 kt of a molecule equal to the change in potential energy calculated in part(: abovethistemperature, thermalagitationprevents the dipoles from aligning with the electric field.) placed in a uniform electric field e with magnitude 1.6 * 6 on the positive x-axis at x = 4.00 cm. (a) if a third charge q3 = +6.00 nc is now placed at the point x = 4.00 cm, y = 3.00 cm, find the x- and y-components of the total force exerted on this charge by the other two. (b) find the magnitude and direction of figure p21.62 ll uu 21.55 . torque on a dipole. an electric dipole with dipole moment ps is in a uniform external electric field es. (a) find the orientations of the dipole for which the torque on the dipole is zero. (b) which of the orientations in part (a) is stable, and which is unstable? (hint: consider a small rotation away from the equi- librium position and see what happens.) (c) show that for the stable orientation in part (b), the dipole’s own electric field tends to oppose the external field. 21.62 ..

If the radius of curvature of the cornea is 0.75 cm when the eye is focusing on an object 36.0 cm from the cornea vertex and the indexes of refraction are as described before, what is the distance from the cornea vertex to the retina? express your answer to two significant

Explain what happens at the saturation point when adding salt to water at room temperature.