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3 years ago

Simple Circuit and Ohm's Law Check-for-Understanding

Physics

2 answers:

kobusy [5.1K]3 years ago

7 0

Current only.

(But in the real world, also power supplied by the battery, power dissipated by the resistor, temperature of the resistor, and temperature of the air around the resistor.)

Vanyuwa [196]3 years ago

4 0

Answer:

current, only

Explanation:

current:I

voltage:U

resistance:R

formula: I=U/R

Increasing the battery cause the increasing in the voltage. Resistance does not normally change. And the current would increase.

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According to the law of conservation of energy, which statement must be true?

Nitella [24]

Answer:

B. A system cannot take in additional matter.

Explanation: The total amount of energy in the universe remains constant, it can merely change from one form to another.

Hope it helps you:)))

have a good day

5 0

2 years ago

A machine has a mechanical advantage of 5. what force should be applied to the machine to make it apply 30000

FrozenT [24]

Answer:

6000

Explanation:

E=Effort MA=mechanical advantage

L=Load

MA=L/E

5=30000/E

5E=30000

E=6000N

4 0

3 years ago

Read 2 more answers

A beam of protons is directed in a straight line along the positive zz ‑direction through a region of space in which there are c

Zinaida [17]

Answer:

The magnitude is $B = \frac{450}{7.9* 10^5}$

The direction is the positive x axis

Explanation:

From the question we are told that

The electric field is E = 450 V/m in the negative y ‑direction

The speed of the proton is $v= 7.9* 10^5\ m/s$ in the positive z direction

Generally the overall force acting on the proton is mathematical represented as

$F_E = q(\vec E + \vec v * \vec B)$

Now for the beam of protons to continue un-deflected along its straight-line trajectory then $F_E =0$

$0 = q( E (-y) + v(z) * \vec B)$

=> $E\^y = v \^ z * \vec B$

Generally from unit vector cross product vector multiplication

$\^ z \ * \ \^ x = \^ y$

So the direction of B (magnetic field must be in the positive x -axis )

$E\^y = v \^ z * B\^ x$

=> $E\^y = vB ( \^ z * \^ x)$

=> $E\^y = vB ( \^y)$

=> $E = vB$

=> $B = \frac{450}{7.9* 10^5}$

=> $B = 0.0005696 \ T$

6 0

4 years ago

An airplane starts its takeoff by moving at 1.7 m/s. The plane must then accelerate at 3.0 m/s2 for the next 30s to reach its fi

otez555 [7]

Answer:

The distance is 1.4 km.

Explanation:

Given that,

Initial velocity u= 1.7 m/s

Accelerate a= 3.0 m/s²

Time = 30 s

We need to calculate the distance

Using equation of motion

$s= ut+\dfrac{1}{2}at^2$

Where, u = initial velocity

a = acceleration

t = time

Put the value in the equation

$s=1.7\times30+\dfrac{1}{2}\times3.0\times(30)^2$

$s=1401\ m$

$s=1.4\ km$

Hence, The distance is 1.4 km.

7 0

4 years ago

What is the amplitude of the resulting wave when the two waves meet at point X?

IrinaK [193]

Answer:

Resulting amplitude, A = 0 cm

Explanation:

The phenomenon of interference occurs when two travel and meet at the same point. There are two conditions for interference. The first one is constructive and the other one is destructive.

In this case, two waves have same amplitude but they are not in same phase such that they meet at point X and destructive interference occurs.

Let A is the amplitude of the resulting wave such that,

$A=A_1-A_2$

$A=2\ cm-2\ cm$

A = 0

So, the amplitude of the resulting wave is 0 cm. Hence, the correct option is (A).

8 0

3 years ago