A. It has a high resistivity because it opposes the movement of
electrons.
O
B. It has a low resistivity because it permits the movement of
electrons.
O
C. It has a high resistivity because it permits the movement of
electrons.
O
D. It has a low resistivity because it opposes the movement of
electrons
The statement that describes an insulator is A. It has a high resistivity because it opposes the movement of electrons.
Insulators simply mean the electrical equipment that are used to support electrical conductors as well as separate them as they do not allow the passage of current.
In an electrical insulator, the electric current doesn't flow freely. It possesses a high resistivity because it opposes the movement of electrons.
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Answer: It has a high resistivity because it opposes the movement of electrons.
Explanation: I know this because I jus took the test & picked c thinking tht this person got it right but it was actually wrong♀️
Answer: C) Unscrew one light. If the other lights turn off, it's a series circuit.
Explanation:
In a series circuit, all the components in the same path. The current in the entire circuit is same. The voltage drop across each component is different. If one component does not work, the entire circuit breaks and other components also stop working. On the other hand, in a parallel circuit, voltage drop across all the components is equal. Trouble in one component does not effect other components.
Hence, to check whether the lights are connected in series or in parallel, one light should be unplugged and if the other lights still work, it means they are connected in parallel otherwise in series. Thus, correct option is C) Unscrew one light. If the other lights turn off, it's a series circuit.
Answer:
The final velocity is -49.05 meters per second.
Explanation:
Let's use an equation of constant acceleration:
Where a is the acceleration and g is the acceleration caused by gravity.
Since the object is being dropped from rest, .
We're looking for the speed after 5 seconds, so .
So the final velocity is -49.05 meters per second.
a building 120 m high. The ball strikes the
ground 64 m horizontally from the point of
release.
What is the speed of the ball just before it
strikes the ground?
Answer in units of m/s.
020 (ment 1
210,
Answer:
50.2 m/s
Explanation:
First of all, we need to find the time it takes for the ball to reach the ground.
The vertical position of the ball at time t is given by
where
h = 120 m is the initial height
u = 0 is the initial vertical velocity
g = -9.8 m/s^2 is the acceleration of gravity
The ball reaches the ground when y = 0. Substituting into the equation and solving for t, we find the time of light:
The vertical component of the velocity of the ball changes following the equation
Substituting t = 4.95 s, we find the final vertical velocity of the ball just before reaching the ground:
where the negative sign means the direction is downward.
We also can find the horizontal component of the velocity: since we know the horizontal distance travelled is d = 64 m,
And the final speed is calculated as the magnitude of the resultant of the two components of the velocity:
Answer:
9.23 m/s
Explanation:
Let, the initial velocity be ux.
The horizontal velocity remans the same. So, time required, t = 25/ux
For vertical component, we know,
h = uy*t + (1/2)*g*t^2 [ g is positive because ball is falling downward ]
Putting in the values, we get,
36 = 0*(25/ux) + 1/2 * 9.81 * (25/u)^2
36 = 3065.625/u^2
u^2 = 85.15625
u = 9.23
[ If there's a problem with the solution, please inform me ]