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WARRIOR [948]
3 years ago
14

PLSSS HELP I WILL GIVE U BRAINLIEST annabelle and jose are building a complete circuit for their science inquiry in class they w

ant the lightbulb to turn on and off so they install a switch the light switch can be used to open and close their circuit Given the information above, which statement below must be true about using a switch in a circuit?
A. The switch must use a conductor such as rubber to open the circuit and light the bulb.
B. The switch must use an insulator such as rubber to close the circuit and light the bulb.
C. The switch must use an insulator such as copper to open the circuit and light the bulb.
D. The switch must use a conductor such as copper to close the circuit and light the bulb.
Physics
2 answers:
AlekseyPX3 years ago
8 0

Answer:the answers is D

Explanation:

all the others answers choices are incorrect

Agata [3.3K]3 years ago
6 0

Answer:

i think its C hope this is rhight have a good day

Explanation:

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The first few steps in deriving the quadratic formula are shown. Which best explains why is not added to the left side of the eq
bija089 [108]
The term b^2 / 4a^2 is not added to the left side of the equation, because the term that was added to the right was not either b^2 / 4 a^2.

As you can see the ther b^2 / 4a^2 that appears in the last step of the table is inside a parenthesis, which is preceded by factor a.


Then, you need to apply the distributive property to know the term that you are really adding to the right side,  i.e. you need to mulitply b^2 / 4a^2 * a which is b^2 / 4a.


That means that you are really adding b^2 / 4a to the right, so that is the same that you have to add to the left, which is what the last step of the table shows.


That situation is reflected by the statement "<span>The distributive property needs to be applied to determine the value to add to the left side of the equation to balance the sides of the equation".</span>  That is the answer.
6 0
3 years ago
Read 2 more answers
Suppose that the moment of inertia of a skater with arms out and one leg extended is 3.0 kg⋅m2 and for arms and legs in is 0.90
babymother [125]

Answer:

Her angular speed (in rev/s) when her arms and one leg open outward is 1.56\frac{rev}{s}

Explanation:

Initial moment of inertia when arms and legs in is I_i=0.90 kg.m^{2}

Final moment of inertia when her arms and on leg open outward, I_f=3.0 kg.m^{2}

Initial angular speed w_i=5.2\frac{rev}{s}

Let the final angular speed be w_f

Since external torque on her is zero so we can apply conservation of angular momentum

\therefore L_f=L_i

=>I_fw_f=I_iw_i

=>w_f=\frac{I_iw_i}{I_f}=\frac{0.9\times5.2 }{3.0}\frac{rev}{s}=1.56\frac{rev}{s}

Thus her angular speed (in rev/s) when her arms and one leg open outward is 1.56\frac{rev}{s}

7 0
3 years ago
Please answer asap its 4:45p m right now and i wanna get done with science class lol and i need help because im a bit confused.
n200080 [17]

1c. The goal of technology is to improve how people live. For example a toothbrush helps prevent cavities and buildup on our teeth.

2a. Science and technology both help improve our lives. Science gives us the knowledge we need to create technology.

2b. A human prosthetic is an example of technology.

2c. Prosthetics are created though scientific study and research. Technology is used to create the material prosthetics are made of and to help design the prosthetics.

3a. Benefits of pesticides: Keeps bugs away from crops, higher crop yields.

Negatives:

pollution, harmful to health

I got all of them except the last one

5 0
3 years ago
toy car A drives with a steady force of 35N and covers 2000 m with fully charged battery. toy car B drives with a steady force o
marissa [1.9K]

Answer:

toy car drives with study force of 35 Newton and covers 2000 with fully charged battery toy car b drives with a study for 80 Newton how far will it be able to drive using the same fully charged battery as karya

8 0
2 years ago
Mitchell records the amount of time a toy car takes to travel down a ramp one time for each of four slope angles. His lab partne
Alchen [17]

Explanation:

Experiments needs to be as accurate and precise as possible. Accuracy and precision helps to keep errors within reasonable limits as they are unavoidable.

How do can we now obtain an accurate and precise result?

After checking that all sources of errors are kept at bay and the procedures perfectly matches the hypothesis being test, it is best to repeat the experiment a few number of times.

Repeating an experiment is scientifically permitted as it helps to eliminate error to a reasonable extent.

Repeating an experiment will also help to authenticate Mitchell's claim and provide a confidence limit to draw a sound conclusion from.

From the repeated results, some statistical parameters that further provide solid backing for the hypothesis being tested will surface.

One of the key attribute of a hypothesis to be acceptable as being valid is that it must be repeatable.

Learn more:

Experiment brainly.com/question/5096428

#learnwithBrainly

4 0
3 years ago
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