Answer:
Now that you know how forces affect the motions of objects, you can use the Tracker video analysis tool to create dynamic models
for a wide range of physical situations.
Tracker enables you to create two different types of mathematical models: analytical and dynamic. An analytical model enables you
to enter mathematical expressions for x and y positions as a function of time. That's sometimes useful, but from a physics
perspective, a dynamic model is much more flexible and powerful.
A dynamic model enables you to set the initial conditions for a particular system (Initial positions and velocities); then you can
mathematically define any forces acting on that system. Once those are set up, the model acts like an object in space, responding to
the forces you've imposed on it. It can continue moving forever, if that's what the forces would do to an object in real life. By visually
matching a marker for your model to the real motion on the video, you can define and refine a mathematical model for a
Answer:
Explanation:
A light year is a unit of length and is defined as "the distance a photon would travel in vacuum during a Julian year at the speed of light at an infinite distance from any gravitational field or magnetic field. "
In other words: It is the distance that the light travels in a year.
This unit is equivalent to 
, which mathematically is expressed as:
Doing the conversion:
This is the distance from Earth to Sirius in miles.
We want to know what is the power supplied by the power cell if the current I=0.5 A and the voltage V=0.43 V. The equation for power P is P= I*V, so:
P=I*V=0.5*0.43=0.215 W
So the correct answer is that the power cell is supplying the motor with P=0.215 W of power.
