The pendulum in a clock gradually slows down and stops moving after a while. A student states that its a loss of mechanical energy is evidence that energy is not always conserved. which two statements offer evidence that the clocks energy is conserved?

A. Friction between its moving parts transforms some of the pendulums mechanical energy into
other forms of energy

B. Conservation of energy happens only when the parts of the clock are oiled to reduce friction.

C. conservation of energy occurs because
the clocks matter is also conserved

D. the pendulum stops moving because all of its mechanical energy has been transformed into thermal energy and sound energy.

Anne applies a force on a toy car and makes it move forward. what can be said about the forces acting on the toy car at the moment anne applies the force?

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.

You are doing a science experiment with a fahrenheit thermometer. your data must be in degrees celsius. if you measure a temperature of 125°f, what is this temperature in degrees celsius