Answer:
B.)Angular momentum is always conserved
Explanation:
Angular momentum is given by:
where
m is the mass of the object
v is its speed
r is the distance between the object and the centre of its circular trajectory
In absence of external torques, angular momentum is always conserved. That means that for the spinning star, if its radius r decreases (because it shrinks), in order for L (the angular momentum) to be conserved, the speed (v) must increases, therefore the spinning star speeds up.
So, the correct choice is
B.)Angular momentum is always conserved
Answer:
The steeper the slope, the higher the density
Explanation:
A graph of mass against volume of different substances helps us to know that the slope is density since density is given by mass per unit volume. Therefore, the steeper the slope, the higher the density and vice versa.
Answer:
Because it is said that the earth rotates and revolves around the sun and moon so it is impossible for the earth not to be spinning.
Explanation:
Answer:
Yes, there is such a way.
Explanation:
If currents flow in the same direction in two or more long parallel wires, there will be an attractive force between the wires. If the current flows in different directions, there will be a repulsive force between the wires. In this case, these three parallel wires, can be be made to carry current in the same direction, creating an attractive force between all three wires.
Note that it is not possible to have at the least one of them carry current in the opposite direction and still have an attractive current between them.
After 4 hrs, the vehicles traveled 256 miles.
<u>Explanation</u>:
Two vehicles traveling at a rate of 40 and 50 miles per hour.
A convertible and a minivan leave a highway junction at the same time.
The convertible travels west at 40 miles per hour = (40/ hr) / 4 = 160 miles
the minivan travels north at 50 miles per hour = (50/hr) / 4 = 200 miles
how far apart are they after 4 hours is = 256 miles.