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Physics

2 answers:

MaRussiya [10]3 years ago

8 0

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Svetradugi [14.3K]3 years ago

6 0

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What is the current flowing through the circuit shown? (V= 120 V, R₁ = 20 02,

spayn [35]

Assumed that resistors are connected in series .

R_net=20+50+10=80ohm

Voltage=V=120V

Current=I

V/R
120/80
3/2
1.5A

3 0

2 years ago

A proton with a velocity in the positive x-direction enters a region where there is a uniform magnetic field B in the positive y

Daniel [21]

Answer:

Negative z-direction

Explanation:

The direction of the force exerted by the magnetic field on a moving (positive) charged particle can be found by using the right-hand rule:

- The index finger corresponds to the direction of the velocity of the particle

- The middle finger corresponds to the direction of the magnetic field

- The thumb gives the direction of the force

For the proton in this problem:

- Index finger: positive x-direction (direction of the velocity)

- Middle finger: positive y-direction (direction of magnetic field)

- Thumb: positive z-direction (direction of the force)

So, the magnetic force on the proton acts in the positive z-direction.

The electric force on a positive charged particle, instead, has the same direction as the electric field.

In this problem, in order to balance the magnetic force, we have to apply an electric force in the negative z-direction: therefore, the electric field must be in the negative z-direction as well, so that the proton will continue along a straight line.

4 0

4 years ago

A 90 kg firefighter needs to climb the stairs of a 20-m-tall building while carrying a 40 kg backpack filled with gear. How much

Alexxx [7]

The power required will be equal to 463.3 watt

Power is defined as the rate of work

$P=\frac{W}{t}$