1. D: the ability to cause a change or do work
The others dont make sense for energy.
2. C: Lamp
A lamp uses the electric current to light up a room, or area.
3. B: foil will bend away
The same charges repel each other that is why a magnet is repelled by the same pole of another magnet.
4. A: Sound
You can’t hear light or any of the other options.
5. A: gravity
Gravity is a force of nature that pulls on everything.
6. C: static electricity
The opposite charges stick to each other, a battery again is an example of this.
7. B: a copper nail
Metal is one of the best electric conductors.
8. C: closed circuit
This is because if a circuit is closed the electricity flows through perfectly but for example an open one would not work or it would leak energy.
Hope this helps
Answer:
A) The north pole of a bar magnet will attract the south pole of another bar magnet.
B) Earth's geographic north pole is actually a magnetic south pole.
E) The south poles of two bar magnets will repel each other.
Explanation:
<u>According to </u><u>classical physics</u>, a magnetic field always has two associated magnetic poles (north and south), the same happens with magnets. This means that if we break a magnet in half, we will have two magnets, where each new magnet will have a new south pole, and a new north pole.
This is because <u>for classical physics, naturally, magnetic monopoles can not exist. </u>
In this context, Earth is similar to a magnetic bar with a north pole and a south pole. This means, the axis that crosses the Earth from pole to pole is like a big magnet.
Now, by convention, on all magnets the north pole is where the magnetic lines of force leave the magnet and the south pole is where the magnetic lines of force enter the magnet.
Then, for the case of the Earth, the north pole of the magnet is located towards the geographic south pole and the south pole of the magnet is near the geographic north pole.
And it is for this reason, moreover, that the magnetic field lines enter the Earth through its magnetic south pole (which is the geographic north pole).
Answer:
g = 0.85 m
Explanation:
g =
were; g is the acceleration due to Earth's gravity, G is Newton's gravitation constant (6.674 x N), M is the mass of the earth (5.972 x kg), and h is the distance of meteoroid to the earth.
h = 3.40 x R
= 3.40 x 6371 km
h = 21661.4 km
= 21661400 m
Thus,
g =
=
= 0.84944
g = 0.85 m
The acceleration due to the Earth's gravitation is 0.85 m.
Answer:
This transformer would be a step-up transformer.
Explanation:
In a transformer, the primary coil is connected to the AC input while the secondary coil is connected to the AC output.
Let and denote the primary voltage (at the input) and number of turns in the primary coil.
Let and denote the secondary voltage (at the output) and the number of turns in the secondary coil.
Ideally, the voltage in each coil would proportional to the number of turns in that coil:
.
For example, in this question, (primary coil, connected to the AC input) whereas (secondary coil, connected to the AC output.)
. Accordingly, the voltage in the secondary coil (AC output) would be approximately times the voltage in the primary coil (AC input): .
Hence, the secondary voltage of this transformer (AC output) would exceed the primary voltage (AC input.) This transformer would be a step-up transformer.
W = weight of the body in air = 160 N
ρ' = density of body
V = volume of the body
weight of the body in air is given as
W = ρ' V g eq-1
W' = weight of the body in liquid = 120 N
force of buoyancy is given as
F = W - W'
F = 160 - 120
F = 40 N
ρ = density of liquid = ?
force of buoyancy is given as
F = ρ V g eq-2
dividing eq-1 by eq-2
160/40 = ρ' V g /(ρ V g )
4 = ρ' /(0.8 )
ρ' = 3.2
(b)3.2