A small rectangular block of metal must be a magnet is it

Physics

1 answer:

Arlecino [84]4 years ago

3 0

D. Is repelled by a magnet

You might be interested in

The orbit of Halley's Comet around the Sun is a long thin ellipse. At its aphelion (point farthest from the Sun), the comet is 5

Arturiano [62]

Answer:

$v_{p}=647.72\frac{km}{s}$

Explanation:

According to Kepler's second law: a line segment joining an object and the Sun sweeps out equal areas during equal intervals of time. This law is equivalent to the constancy of the angular momentum, that is to say:

$\Delta \vec{L}=0\\\vec{L}_{p}=\vec{L}_{a}\\m*(\vec{r}_{p}\times \vec{v}_{p})=m*(\vec{r}_{a}\times \vec{v}_{a})\\mr_{p} v_{p}sin (\theta)=mr_{a} v_{a}sin (\theta)$

Here, $m$ is the comet's mass, $r$ is its distance from the Sun, $v$ is its speed and $\theta$ the angle between $\vec{r}$ and $\vec{v}$

The aphelion and the perihelion are the only two points in the orbit where the radius and velocity are perpendicular. Therefore, at these 2 points, the angular momentum module can be calculated as a simple product:

$mr_{p} v_{p}sin (^\circ 90)=mr_{a} v_{a}sin (^\circ 90)\\mr_{p} v_{p}=mr_{a} v_{a}$