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3 years ago

A current of 0.75 passes through a flashlight bulb that is connected to a 3.0-V battery. Calculate the bulb's resistance.

Physics

1 answer:

dangina [55]3 years ago

6 0

Answer:

4 ohms

Explanation:

Use Ohm's Law: V = IR

V = 3.0 V

I = 0.75 A

Plug thise values into the equation:

3.0 V = (0.75 A) R

---> R = 4 ohms

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A particle with a charge of −1.24×10−8c is moving with instantaneous velocity v⃗ = (4.19×104m/s)i^ + (−3.85×104m/s)j^ . part a w

Bezzdna [24]

Answer:

F = 0i (in the x-direction), 0j (in the y-direction),-8.59*10^-4 N k (In the z-direction)

Explanation:

The force given by charged particles moving in a magnetic field is given below (cross is cross product, they don't have that format in the equation tool):

$F=qv (cross) B\\$

Now we can perform the cross product between v and B

$v(cross)B = \left[\begin{array}{cc}4.19*10^{4} &-3.85*10^{4}\\1.8&0&\en[tex]v(cross)B = 69300 (kg*m/(s^2*C))\\$ d{array}\right][/tex]

Now multiply by Q (charge) to get the force

$F = -1.24*10^-8 * 69300\\F = -8.59*10^-4N$

F = -8.59*10^-4 N k

F = 0i, 0j, (-8.59*10^-4)k

6 0

3 years ago

Read 2 more answers

A jet airliner moving initially at 612 mph (with respect to the ground) to the east moves into a region where the wind is blowin

Ganezh [65]

Answer:

966.22 mph

Explanation:

Velocity of plane with respect to wind (Vp,w)= 612 mph east

velocity of wind with respect to ground, (Vw,g) = 362 mph at 15° North of

east

Write the velocities in vector form

$V_{p,w}=612\widehat{i}$

$V_{w,g}=362\left ( Cos15\widehat{i}+Sin15\widehat{j} \right )= 349.67\widehat{i}+93.69\widehat{j}$

Use the formula for the relative velocity

$V_{p,w}=V_{p,g}-V_{w,g}$

Where, V(p,w) is the velocity of plane with respect to wind

V(p,g) is the velocity of plane with respect to ground

V(w,g) is the velocity of wind with respect to ground

So, $V_{p,g}=V_{p,w}+V_{w,g}$

$V_{p,g}=\left ( 612+349.67 \right )\widehat{i}+93.69\widehat{j}$

$V_{p,g}=961.67\widehat{i}+93.69\widehat{j}$

Magnitude of velocity of lane with respect to ground

$V_{p,g} = \sqrt{961.67^{2}+93.69^{2}}$

V(p,g) = 966.22 mph

5 0

4 years ago

Producing a current by moving a wire through a magnetic field is called “BLANK” induction

NeX [460]

Producing a current by moving a wire through a magnetic field is called ELECTROMAGNETIC INDUCTION.
Electromagnetic induction refers to the production of an electromotive force across an electrical conductor in a changing magnetic field. The process was discovered by Micheal Faraday in 1831.

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3 years ago

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What is the half-life of isotope X?

Brrunno [24]

Answer:

Explanation:

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3 years ago

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If he completes the 200 m dash in 23 s and runs at constant speed throughout the race, what is his centripetal acceleration as h

Blababa [14]

Incomplete question.The complete one is here

A runner taking part in the 200m dash must run around the end of a track that has a circular arc with a radius curvature of 30m. The runner starts the race at a constant speed. If she completes the 200m dash in 23s and runs at constant speed throughout the race, what is her centripetal acceleration as she runs the curved portion of the track?

Answer:

$a_c=2.523m/s^2$