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Lemur [1.5K]
3 years ago
12

A car accelerates from rest at 7.2 m/s 2 . How much time does it need to attain a speed of 4 m/s? Answer in units of s.

Physics
1 answer:
Leni [432]3 years ago
7 0

Answer:

The time is 0.6 sec.

Explanation:

Given that,

Acceleration of car = 7.2 m/s²

Speed = 4 m/s

We need to calculate the time

Using equation of motion

v=u+at

Where, u = initial velocity

v = final velocity

a = acceleration

t = time

Put the value in the equation

4=0+7.2\times t

t=\dfrac{4}{7.2}

t=0.6\ sec

Hence, The time is 0.6 sec.

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A series RC circuit contains two resistors and two capacitors. The resistors are 39 ohms and 56 ohms. The capacitors have capaci
Nataly [62]

Answer:

The  correct option is b

Explanation:

From the question we are told that

    The resistance of the first resistor is  R_1 =  39 \ \Omega

     The resistance of the second resistor is  R_2 =  56 \  \Omega

      The capacitive reactance of the first capacitor is jX_{c_1 }  =  80 \ \Omega

       The capacitive reactance of the first capacitor is jX_{c_2 }  =  40 \ \Omega

Generally given that the resistors are connected in parallel , their equivalent resistance is  

            R_e =  R_1 +R_2

=>         R_e = 39 + 56

=>         R_e = 95 \  \Omega

Generally given that the capacitors are connected in parallel , their equivalent capacitive reactance  is  

          jX_e =  jX_{c_1} +  jX_{c_2}

=>       jX_e = 80 + 40

=>       jX_e = 120

Hence the impedance of the circuit is  

         Z =  R_e - jX_e        

=>      Z = 95  -  j120          

Generally from the impedance equation , the total used resistance is  

       R_e =  95 \  \Omega

3 0
3 years ago
Which group's right to vote is protected by the Nineteenth Amendment? Question 7 options: African Americans Native Americans 18-
lisabon 2012 [21]

7. The nineteenth amendment protects the right to vote of 18 year old women.

8.The 24th amendment eliminated poll taxes and increases voting rights in the United States.

9.National voter Registration allowed the option for adults to register vote when they obtain or renew  a driver's license.

10.Three steps in voting process are registering to vote, preparing to vote and casting a ballot.

11.The statement that was not an effect of the United States Supreme Court's ruling in Bush vs Gore is Tennessee's electoral collage votes went to Al Gore.

12.The general election requires the United States choose  a president

13.The type of election that is held to fill  a public office that is left vacant when an official resigns is special election.

14.The position that a person actually vote for when a voter chooses a candidate for president is an elector in the elector college.

15.A possible candidate for president would form an exploratory committee to see how much support he or she can expect.

4 0
3 years ago
Read 2 more answers
An object on a number line moved from x = 15 cm to x = 165 cm and then
olasank [31]

Answer:

v_avg = 2.9 cm/s

Explanation:

The average velocity of the object is the sum of the distance of all its trajectories divided the time:

v_{avg}=\frac{x_{all}}{t}

x_all is the total distance traveled by the object. In this case you have that the object traveled in the first trajectory 165cm-15cm = 150cm, and in the second one, 165cm - 25cm = 140cm

Then, x_all = 150cm + 140cm = 290cm

The average velocity is, for t = 100s

v_{avg}=\frac{290cm}{100s}=2.9\frac{cm}{s}

hence, the average velocity of the object in the total trajectory traveled is 2.9 cm/s

3 0
3 years ago
Read 2 more answers
Boat carrying people more than its capacity is attributes of sinking why​
alisha [4.7K]
It will sink because of how much the max capacity a boat can have it will sink because it is over capacity that’s why it will sink.

Hope this helps :)
5 0
3 years ago
Read 2 more answers
If the box weighs 40 newtons and is lifted a distance of 2 meters, how much work is done on the box?
Zarrin [17]

Answer:

The work done on the box is 80 J.

Explanation:

Given that,

Weight of box = 40 N

Distance = 2 meter

We need to calculate the work done

Using formula of work done

W=F\times x

W=mg\times x

Where, x = distance

mg = weight

Put the value into the formula

W=40\times2

W= 80\ Nm

W=80\ J

Hence, The work done on the box is 80 J.

5 0
4 years ago
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