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3 years ago

what happens to the current across a circuit when the voltage is doubled while the resistance is held back

2 answers:

8 0

The current is directly proportional to the voltage and inversely proportional to the resistance. So doubling or tripling the resistance will cause the current to be one-half or one-third the original value

Lynna [10]3 years ago

7 0

Since the current is inversely propotional to its resistance, when the voltage is doubled the current will be one-half

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Two blocks are connected by a massless rope that passes over a 1 kg pulley with a radius of 12 cm. The rope moves over the pulle

tangare [24]

Answer:

$F=1.159$

Explanation:

From the question we are told that:

Mass of pulley $M=1kg$

Radius $r=12cm$

Mass of block A $M_a=2.1kg$

Mass of block B $m_b=4.1kg$

Spring constant $\mu= 358 J/m2$

Generally the equation for Torque is mathematically given by

Since $\sumF=ma$

At mass A

$T_2-f_3=2.1a$

At mass B

$4.8-T_1=4.1a$

At Pulley

$R(T_1-T_2)=\frac{1*1*R^2}{2}\frac{a}{R}$

$R(T_1-T_2)=0.55a$

Therefore the equation for total force F

At mass A+At mass B+At Pulley

$(T_2-f_3+4.8-T_1+R(T_1-T_2)=2.1a+4.1a+0.55a$

$(T_2-f_3+4.8-T_1+R(T_1-T_2)=2.7a+4.8a+0.55a$

$-f_3+4.1=6.75a$

$-f_3=6.75a+4.8$

Since From above equation

$M_{eff}=6.7kg$

Therefore

$T=2\pi \sqrt{{\frac{M_{eff}}{k}}$

$T=2\pi \sqrt{{\frac{6.75}{\mu}}$

$T=0.862s$

Generally the equation for frequency is mathematically given by

$F=\frac{1}{T} \\F=\frac{1}{0.862}$

$F=1.159$

3 0

3 years ago

In the blanks below write what the independent variable and the dependent variable would be for each experiment. (what are you t

tiny-mole [99]

Answer:

1. independent- if you studied. dependent- test scores

2. independent- behavior of students. dependent-student grades

3. independent- what you eat. dependent- amount of gas

4. independent- which bait you use. dependent- how much fish you catch

5. independent-if you talk to the plants or not. dependent- growth

6. independent- whether you eat breakfast or not. dependent-student performance

7. independent- which animal you test. dependent- speed of the animals

8. independent- how much candy you eat. dependent- cavities or not

9. independent- if you eat no sugar or no carbs. dependent- how much weight you lose

10. independent- which thing you measure. dependent- the measurements

4 0

3 years ago

Your toaster has a power cord with a resistance of 2.2x10^−2 Ω connected in series with a 9.7 Ω nichrome heating element. The po

kati45 [8]

Answer:

(A) 654.545 Kw

(B) $2.885\times 10^5kw$

Explanation:

We have given resistance of the toaster $R_1=2.2\times 10^{-2}ohm=0.022ohm$

Resistance of nichrome heating element $R_2=9.7ohm$

Both the resistances are connected in series so same current will flow through the circuit

Potential difference across the toaster V = 120 volt

So current $i=\frac{120}{0.022}=5454.5454A$

(a) Power dissipated in toaster $P=i^2R=5454.5454^2\times 0.022=654545.441W=654.545kw$

(B) Power dissipated in heating element $P=i^2R=5454.5454^2\times 9.7=2.885\times 10^8W=2.885\times 10^5kw$

5 0

4 years ago

Explain what concave and convex mirrors do to parallel rays directed to their surfaces.

dezoksy [38]

Answer:

the man who are you support Russia and your birthdayto is made by the day is in Today Android of the world ye hai song

Explanation:

there are not false and your family is not a well of you and you t are

7 0

2 years ago

9.Water flows'along a horizontal pipe of cross sectional area 48cm2 which has a constriction of

Kamila [148]

Answer:

v₁ = 9 m/s

Explanation:

Here, we can use the continuity equation, as follows:

$A_1v_1 = A_2v_2$

where,

A₁ = Cross-sectional area of the wider section = 48 cm²

A₂ = Cross-sectional area of the constriction = 12 cm²

v₁ = speed of flow in wider section = ?

v₂ = speed flow in constriction = 36 m/s

Therefore,

$(48\ cm^2)v_1 = (12\ cm^2)(36\ m/s)\\\\v_1 = \frac{(12\ cm^2)(36\ m/s)}{(48\ cm^2)} \\\\$

3 0

3 years ago

what happens to the current across a circuit when the voltage is doubled while the resistance is held back ​

what happens to the current across a circuit when the voltage is doubled while the resistance is held back