1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
faltersainse [42]
2 years ago
7

A-Some resistors are labelled with a red band. This shows that their true resistance will be within 2, point, 0, percent,2.0% of

the value shown on the side. What is the largest current you would expect through a 15kΩ, 2.0% resistor when connected to a 5, point, 0, V,5.0V supply? Give your answer in m, A, mA.
B- When both of a car's red tail lamps are lit, this 'draws' a current of 0, point, 83, A,0.83A from the battery.Given that a car battery has a voltage of 12, V,12V, what is the resistance of each lamp? The lamps are wired in parallel.
Physics
1 answer:
tino4ka555 [31]2 years ago
4 0

A–The ratio of the voltage to the maximum resistor value gives the

largest current of 340.14 mA. In B–The lamp resistance is 28.9 Ω each.

Responses (approximate values):

A- The largest current is <u>340.14 mA</u>

B- The resistance of each lamp is 28.9 Ω

<h3>Which methods can be used to find the current and resistances?</h3>

The range of values of the resistor = ±2%

The magnitude of the given resistor, R = 15 kΩ

The voltage supply, V = 5.0 V

Required:

Largest current, <em>I</em>, expected through the resistor.

Solution:

Current, \, I = \mathbf{\dfrac{V}{R}}

The current is largest when the resistor's value is smallest, which gives;

  • Largest \ current, \, I_{max} = \mathbf{ \dfrac{ 5.0 \, V}{\left(15 - \frac{2}{100} \times 15 \right) \Omega}}  = \dfrac{50}{147} \, A \approx \underline{340.14 \,  mA}

B- Current drawn from car head lamps = 0.83 A

Voltage of the battery = 12 V

Required;

Resistance of each of the two lamps wired parallel.

Solution;

Let <em>R</em> represent the resistance of each lamp in the parallel connection,

we have;

Equivalent \ resistance, \, R = \mathbf{ \dfrac{1}{\frac{1}{R} + \frac{1}{R}  }} = \dfrac{R}{2}

Therefore;

\dfrac{R}{2} = \dfrac{12 \, V}{0.83 \, A}

  • The \ resistance \ of \ each \ lamp, \,  R = \dfrac{12 \, V}{0.83 \, A} \times 2 \approx \underline{28.9 \, \Omega}

Learn more about the calculations for the voltages and currents in a circuit here:

brainly.com/question/1372476

brainly.com/question/996480

brainly.com/question/868651

You might be interested in
Two tugboats pull a disabled supertanker. Each tug exerts a constant force of 2.20×106 N , one at an angle 19.0 ∘ west of north,
valina [46]

Answer:

=2.99\times10^9J

Explanation:

According to the question

net force F = 2.20×10^6 N

displacement S = 0.72\times10^3m

from figure , the horizontal forces are same in magnitude and opposite direction.

so , neglect these two forces.

we can take only vertical components of the force.

total force F' = F cos 19° + F cos 19°

= 2×F×cos 19°   ................. (1

therefore , total work is

W = F'S

= (2F cos19)×S

= (2)(2.20\times10^6 N)cos19° (0.720\times10^3 m)

=2.99\times10^9J

6 0
3 years ago
A projectile is launched from ground level at angle u and speed v0 into a headwind that causes a constant horizontal acceleratio
ale4655 [162]

Answer:

Explanation:

Given

Launch angle =u

Initial Speed is v_0

Horizontal acceleration is a_x=a

At maximum height velocity is zero therefore

v_f=v_i-gt

0=v_0\sin u-gt

t=\frac{v_0\sin u}{g}

Total time of flight T=2t=\frac{2v_0\sin u}{g}

During this time horizontal range is

R=v_o\cos u\cdot 2t-\frac{a(2t)^2}{2}

R=\frac{2v_0^2\sin u\cos u}{g}-\frac{2av_0^2\sin ^u}{g^2}

For maximum range \frac{\mathrm{d} R}{\mathrm{d} u}=0

\frac{\mathrm{d} R}{\mathrm{d} u}=\frac{2v_0^2\cos 2u}{g}-\frac{4av_0^2\sin u\cos u}{g^2}

\frac{\mathrm{d} R}{\mathrm{d} u}=\frac{2v_0^2}{g}\left [ \cos 2u-\frac{a}{g}\sin 2u\right ]=0

\tan 2u=\frac{g}{a}

u=\frac{1}{2}tan ^{-1}\frac{g}{a}

(b)If a =10% g

a=0.1g

thus u=\frac{1}{2}tan^{-1}\frac{g}{0.1g}

u=42.14^{\circ}

7 0
3 years ago
Why do land animals including meat eaters depend on soil
dexar [7]
They depend on it because this helps them maintain nutirance and survive and reproduce more.
4 0
3 years ago
A solenoid of length 18 cm consists of closely spaced coils of wire wrapped tightly around a wooden core. The magnetic field str
Kisachek [45]

Answer:

B_2 = 1.71 mT

Explanation:

As we know that the magnetic field near the center of solenoid is given as

B = \frac{\mu_0 N i}{L}

now we know that initially the length of the solenoid is L = 18 cm and N number of turns are wounded on it

So the magnetic field at the center of the solenoid is 2 mT

now we pulled the coils apart and the length of solenoid is increased as L = 21 cm

so we have

\frac{B_1}{B_2} = \frac{L_2}{L_1}

now plug in all values in it

\frac{2.0 mT}{B_2} = \frac{21}{18}

B_2 = 1.71 mT

3 0
2 years ago
A ball is thrown directly downward with an initial speed of 7.65 m/s froma height of 29.0 m. After what time interval does it st
coldgirl [10]

Answer: 1.77 s

Explanation: In order to solve this problem we have to use the kinematic equation for the position, so we have:

xf= xo+vo*t+(g*t^2)/2  we can consider the origin on the top so the xo=0 and xf=29 m; then

(g*t^2)/2+vo*t-xf=0  vo is the initail velocity, vo=7.65 m/s

then by solving the quadratric equation in t

t=1.77 s

8 0
3 years ago
Other questions:
  • A policeman in a stationary car measures the speed of approaching cars by means of an ultrasonic device that emits a sound with
    8·2 answers
  • A TV has a power of 130 watts and an efficiency of 80 percent. How much
    7·1 answer
  • What does the slope of a secant line represent?
    7·1 answer
  • If you adjusted the frequency to be lower than the resonant frequency, would the voltage have been leading ahead of or lagging b
    14·1 answer
  • A particle's position along the x-axis is described by. x(t)= At+Bt^2where t is In seconds: x is in meters: and the constants A
    11·1 answer
  • the average velocity of a duck is zero as it goes from t=0 to t=120 s. describe the displacement of the duck for that interval
    15·1 answer
  • ¿Es posible denominar al creacionismo como modelo científico?
    7·1 answer
  • What is a situation when you might travel at a high velocity, but with low acceleration?
    5·2 answers
  • A ball of mass 0.3kg, moving at a velocity of 20m/s is suddenly hit by a force of 5N for a time of 0.03 sec. Find its new veloci
    12·1 answer
  • If object A is half the mass of object B, then is it possible for them to have the same momentum
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!