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maxonik [38]
4 years ago
6

66 POINTS HELP PLS

Physics
2 answers:
jasenka [17]4 years ago
7 0
QUESTION 1 -

Which of the following best describes the use of a renewable resource? (2 points)

ANSWER:

C. There are areas in California that use the heat from deep in the Earth to generate electricity.

The answer is Option C as it is the only option which refers to a renewable energy resource. The renewable source which it refers to is geothermal energy as it is heat obtained from deep within the Earth which is utilised to produce electricity. Therefore, Option C is the answer.

QUESTION 2 -

Which of the following best describes the use of a non-renewable resource? (2 points)

ANSWER:

C. Natural gas is a great alternative to electricity for cooking.

The answer is Option C as it is the only option which refers to a non-renewable energy resource. Natural gas is a non-renewable resource as it was formed from the buried remains of plants and animals who were alive a significantly long time ago, thus making them fossil fuels. As all fossil fuels are non-renewable, natural gas must be a non-renewable resource. Therefore, Option C is the answer.

QUESTION 3 -

Which of the following best describes the use of a renewable resource? (2 points)

ANSWER:

D. Solar panels are able to gather the energy from the sun and convert it into electrical energy.

The answer is Option D as it is the only option which refers to a renewable energy resource. The renewable resource it refers to is solar energy as solar panels are utilised in order to produce solar energy for electricity. Solar energy is renewable as it utilises the sun's energy in the form of heat and light energy. As the sun's energy is unlimited and renewable resources are meant to be unlimited, solar energy must be a renewable energy resource. Therefore, the answer must be Option D.

QUESTION 4 -

Select the example that best describes a renewable resource. (2 points)

ANSWER:

B. My town is powered by electricity that is generated by the energy from the flow of water through a large dam.

The answer is Option B as it is the only option which refers to a renewable energy resource. The renewable resource it refers to is hydroelectricity also known as hydropower as it utilises energy from the flow of water in a large controlled dam. Hydropower is renewable as it utilises energy from the flow if water which is an unlimited resource. As hydropower is unlimited and renewable energy is meant to be unlimited, hydropower must be a renewable resource. Therefore, the answer must be Option B.

QUESTION 5 -

Which example describes a non-renewable resource? (2 points)

ANSWER:

D. There are drilling platforms all along the coast that are used to drill for natural gas that can be used to generate electricity.

The answer is Option D as it is the only option which refers to a non-renewable energy resource. Natural gas is a non-renewable resource as it was formed from the buried remains of plants and animals who were alive a significantly long time ago, thus making them fossil fuels. As all fossil fuels are non-renewable, natural gas must be a non-renewable resource. Therefore, Option D is the answer.

Hope this helps! :)
Have a lovely day! <3
kozerog [31]4 years ago
6 0

Answer:

a b d b a c

Explanation:

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Instead of moving back and forth, a conical pendulum moves in a circle at constant speed as its string traces out a cone (see fi
tigry1 [53]

Answer:

a

The  radial acceleration is  a_c  = 0.9574 m/s^2

b

The horizontal Tension is  T_x  = 0.3294 i  \ N

The vertical Tension is  T_y  =3.3712 j   \ N

Explanation:

The diagram illustrating this is shown on the first uploaded

From the question we are told that

   The length of the string is  L =  10.7 \ cm  =  0.107 \ m

     The mass of the bob is  m = 0.344 \  kg

     The angle made  by the string is  \theta  =  5.58^o

The centripetal force acting on the bob is mathematically represented as

         F  =  \frac{mv^2}{r}

Now From the diagram we see that this force is equivalent to

     F  =  Tsin \theta where T is the tension on the rope  and v is the linear velocity  

     So

          Tsin \theta  =   \frac{mv^2}{r}

Now the downward normal force acting on the bob is  mathematically represented as

          Tcos \theta = mg

So

       \frac{Tsin \ttheta }{Tcos \theta }  =  \frac{\frac{mv^2}{r} }{mg}

=>    tan \theta  =  \frac{v^2}{rg}

=>   g tan \theta  = \frac{v^2}{r}

The centripetal acceleration which the same as the radial acceleration  of the bob is mathematically represented as

      a_c  =  \frac{v^2}{r}

=>  a_c  = gtan \theta

substituting values

     a_c  =  9.8  *  tan (5.58)

     a_c  = 0.9574 m/s^2

The horizontal component is mathematically represented as

     T_x  = Tsin \theta = ma_c

substituting value

   T_x  = 0.344 *  0.9574

    T_x  = 0.3294 \ N

The vertical component of  tension is  

    T_y  =  T \ cos \theta  = mg

substituting value

     T_ y  =  0.344 * 9.8

      T_ y  = 3.2712 \ N

The vector representation of the T in term is of the tension on the horizontal and the tension on the vertical is  

         

       T  = T_x i  + T_y  j

substituting value  

      T  = [(0.3294) i  + (3.3712)j ] \  N

         

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