7. Which of the following statements are true statements about electric force? Choose all that apply. a. Electric force is a contact force.
b. A doubling of the quantity of charge on one of the objects results in a doubling of the electric
force.
C. Electric forces between two charged objects increases with increasing quantity of charge on
the objects.
d. Electric forces can only act between charged objects - either like-charged or oppositely-
charged.
e. If object A attracts object B with an electric force, then the attractive force must be mutual -
i. e., object B also attracts object A with the same force.
f. Electric forces between two charged objects increases with increasing separation distance.

Suppose you have a box. which of these is not necessarily a true statement regarding the relationship between the force applied to the box, the work done on the box, and the distance the box is moved? a. if the box is not moved, no force is being applied to the box. b. if no force is applied to the box, no work is done on the box. c. if work is done on the box, then a force is applied to the box. d. if work is done on the box, then the box is moved a distance.

Astudent throws a water balloon with speed v0 from a height h = 1.76 m at an angle θ = 21° above the horizontal toward a target on the ground. the target is located a horizontal distance d = 9.5 m from the student’s feet. assume that the balloon moves without air resistance. use a cartesian coordinate system with the origin at the balloon's initial position. (a) what is the position vector, rtarge t, that originates from the balloon's original position and terminates at the target? put this in terms of h and d, and represent it as a vector using i and j. (b) in terms of the variables in the problem, determine the time, t, after the launch it takes the balloon to reach the target. your answer should not include h. (c) create an expression for the balloon's vertical position as a function of time, y(t), in terms of t, vo, g, and θ. (d) determine the magnitude of the balloon's initial velocity, v0, in meters per second, by eliminating t from the previous two expressions.

Newtons view of arrangement of the universe. don't copy from anywhere.