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SpyIntel [72]
3 years ago
14

Object A is positively charged. Object A and Object B

Physics
1 answer:
ozzi3 years ago
4 0

Answer: object B is negatively charged, object C is positively charged and object D is also positively charged

Explanation: since unlike charges attract and like charges repel, for object A which is positively charged and B to attract B must be negatively charged and then for B which is negatively charged and C to attract C must be positively charged and for C and D to repel they have to be of thesame charge which means D is positive as well.

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What phenomenon will take place as a light wave bends when it passes from one medium into another?
Licemer1 [7]
Refraction
the fact or phenomenon of light, radio waves, etc. being deflected in passing obliquely through the interface between one medium and another or through a medium of varying density.
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3 years ago
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Blake stands in a canoe in the middle of a lake. The canoe is stationary. Blake holds an anchor mass of 15 kg, then throws it we
Inessa05 [86]

The velocity of the canoe is  1.7 m/s.

<h3>What is momentum?</h3>

Momentum in physics is the products of mass and velocity. Now we have to find momentum with the formula; p = mv

a) Initial momentum = (15)8 m/s + 135 = 255 Kgms-1

b) Since momentum is conserved, the total momentum after throwing the anchor is still 255 Kgms-1

c) The final velocity of the boat is obtained from;

255 Kgms-1 = (15Kg + 135 Kg) v

v = 255 Kgms-1/(15Kg + 135 Kg)

v = 1.7 m/s

Learn more about momentum: brainly.com/question/904448

5 0
2 years ago
Sixty-three joules of heat are added to a closed system. The initial internal energy of the system is 58 J, and the final intern
MakcuM [25]
I posted this because I got it correct.  The answer is 28J.
5 0
2 years ago
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What are the component parts of modern fireworks? What does each part do?
EleoNora [17]

Answer: Aluminum, Antimony, Barium, Calcium, Carbon, Chlorine, Copper, Iron, Lithium, Magnesium, Oxygen, Zinc, Titanium, Strontium, Sulfur, Sodium, Potassium, Phosphorus

Explanation:

Aluminum: Aluminum is a common component of sparklers.  It is used to produce silver and white flames and sparks.

Antimony: Antimony is used to create firework glitter effects.

Barium: Barium is used to create green colors in fireworks, and it can also help stabilize other volatile elements.

Calcium: Calcium is used to deepen firework colors. Calcium salts produce orange shades in the fireworks.

Carbon: Carbon is an important components of black powder, which is used as a propellant in fireworks. Carbon provides the fuel for a firework. Common forms include carbon black, sugar, or starch.

Chlorine: Chlorine is an important component of many oxidizers in fireworks. Several of the metal salts that produce colors contain chlorine.

Copper: Copper compounds produce blue shades in fireworks.

Iron: Iron is used to produce sparks. The heat of the metal determines the color of the sparks in this case.

Lithium: Lithium is a metal that is used to impart a red color to fireworks. Lithium carbonate, in particular, is a common colorant.

Magnesium: Magnesium burns a very bright white, so it is used to add white sparks or improve the overall brilliance of a firework.

Oxygen: Fireworks include oxidizers, which are substances that produce oxygen in order to support. The oxidizers are usually nitrates, chlorates, or perchlorates. Sometimes the same substance is used to provide oxygen and color.

Phosphorus: Phosphorus burns spontaneously in air and is also responsible for some glow-in-the-dark effects. It may be a component of a firework's fuel.

Potassium: Potassium helps to oxidize firework mixtures. Potassium nitrate, potassium chlorate, and potassium perchlorate are all important oxidizers.

Sodium: Sodium produces a gold or yellow color in fireworks, however, the color may be so bright that it masks less intense colors.

Sulfur: Sulfur is a component of black powder. It is found in the firework's propellant/fuel.

Strontium: Strontium salts give a red color to fireworks. Strontium compounds are also important for stabilizing fireworks mixtures.

Titanium: Titanium metal can be burnt as powder or flakes to produce silver sparks.

Zinc: Zinc is used to create smoke effects in fireworks and other pyrotechnic devices.

5 0
3 years ago
Two stationary positive point charges, charge 1 of magnitude 3.00 nC and charge 2 of magnitude 1.80 nC , are separated by a dist
MA_775_DIABLO [31]

Answer: U = -4.97*10^-17 J

Explanation:

Potential Energy of point charges,

U = kqq• / r, where

U = Potential Energy

q, q• = value of electric charges

k = 8.99*10^9 N.m²/C² constant of proportionality

r = distance between two charges

a) first electric potential due to electric field of first charge

q = 3*10^-9 C

q• = q(electron) = -1.602*10^-19 C

r = 0.5 * 31 cm = 15.5 cm = 0.155 m

U1 = kqq•/r

U1 = (8.99*10^9 * 3*10^-9 * -1.602*10^-19) / 0.155

U1 = -4.32*10^-18 / 0.155

U1 = -2.79*10^-17 J

Second electric potential due to electric field of second charge

U2 = kqq•/r

U2 = (8.99*10^9 * 1.8*10^-9 * -1.602*10^-19) / 0.155

U2 = -2.59*10^-18 / 0.155

U2 = -1.67*10^-17 J

U = U1 + U2

U = -2.79*10^-17 + -1.67*10^-17

U = -4.46*10^-17 J

b) first electric potential due to electric field of the first charge

q = 3*10^-9 C

q• = q(electron) = -1.602*10^-19 C

r = 10 cm = 0.1 m

U1 = kqq•/r

U1 = (8.99*10^9 * 3*10^-9 * -1.602*10^-19) / 0.1

U1 = -4.32*10^-18 / 0.1

U1 = -4.32*10^-17 J

Second electric potential to the electric field of second charge

q = 1.8*10^-9

q• = -1.602*10^-19 C

r = 50 - 10 = 40 cm = 0.4m

U2 = (8.99*10^9 * 1.8*10^-9 * -1.602*10^-19) / 0.4

U2 = -2.59*10^-18 / 0.4

U2 = -6.48*10^-18 J

U = U1 + U2

U = -4.32*10^-17 + -6.48*10^-18

U = -4.97*10^-17 J

5 0
3 years ago
Read 2 more answers
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