Answer:
(a) %a, 10 A, 0.833 A
(b) 12 ohm
(c) $22.8
Explanation:
Power of toaster, P1 = 600 W
Power of iron, P2 = 1200 W
Power of bulb, P3 = 100 W
V = 120 V
As they are in household circuit, so they are connected in parallel, so the voltage is same for all.
(a) Use the formula P = V x i
Current in toaster, i1 = P1 / V = 600 / 120 = 5 A
Current in iron, i2 = P2 / V = 1200 / 120 = 10 A
Current in bulb, i3 = P3 / V = 100 / 120 = 0.833 A
(b) Resistance of heating element of iron is R2.
V = i2 x R2
120 = 10 x R2
R2 = 12 ohm
(c) Total energy consumed in 24 hours for 5 days
= (600 + 1200 + 100) x 24 x 5 = 228000 Wh = 228 KWh
Cost of 1 KWh = $0.1
Cost of 228 KWh = 0.1 x 228 = $22.8
Answer:
Explanation:
Brownian motion is a random (irregular) motion of particles e.g smoke particle. The set up in the diagram can be used to observe the motion of smoke.
1. The apparatus used are:
A is a source of light
B is a converging lens
C is a glass smoke cell
D is a microscope
2. The uses of the apparatus are:
A - produces the light required to so as to see clearly the movement of the particles.
B - converges the rays of light from the source to the smoke cell.
C - is made of glass and used for encamping the smoke particles so as not to mix with air.
D - is used for the clear view or observation or study of the motion of the smoke particles in the cell.
Answer: If it has ions, it is an electrolyte
Explanation:
Let's start by explaining that electrolytes are compounds that contain charged particles or<u> ions</u>, which can be cations (positive ions) or anions (negative ions).
So, it is this composition that makes an electrolytic material conduct electricity.
In this sense, the way to identify if a material is an electrolyte or not, is knowing whether it is composed of ions or not.
Answer:
B Negative
Explanation:
Its negative because when your going 25 mph your moving faster and when your coming up to the stop sign you will start to slow down going 10 mph then 0 mph when you reach the stop sign so it will be negative.
Answer:
First Quarter and Third Quarter.
Explanation:
Tides are formed as a consequence of the differentiation of gravity due to the Moon across to the Earth sphere.
Since gravity variates with the distance:
(1)
Where m1 and m2 are the masses of the two objects that are interacting and r is the distance between them.
For example, seeing the image below, point A is closer to the Moon than point b, and at the same time the center of mass of the Earth will feel more attracted to the Moon than point B. Therefore, that creates a tidal bulge in point A and point B.
When the Sun and the Moon are alight with respect to the Earth, then the Sun tidal force contributes to the tidal force of the Moon over the Earth. That makes the high tides even higher (spring tides).
However, when the Sun is not in the same line than the Moon (the Moon is at 90° with respect to the Sun), then the low tides are higher and the high tides are lower. That scenario is known as neap tides.
Therefore, that happens when the Moon is at First Quarter and Third Quarter.