An electric motor converts electrical energy into energy.

Help please can’t fail physics

bezimeni [28]

Answer:

2, less than the change in momentum

Explanation:

hope this helps!! :)

6 0

3 years ago

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Resistor A has twice the resistance of resistor B. The two are connected in series and a potential difference is maintained acro

Ainat [17]

Answer:

The thermal energy dissipated in A would be twice that in B

Explanation:

Resistor B (RB)= R

Resistor A (RA)= 2 R

When they are connected in series the equivalent Resistance in the circuit would be;

Equivalent resistance = RA +RB = R + 2 R = 3 R;

From ohms law I = V/R

I = V/3 R

Now the thermal energy is the power dissipated by the circuit and can be obtained thus;

P = $I^{2}R$

Then,

$P_{A} = (\frac{V}{3R}) ^{2} *2 R\\\\P_{A} = \frac{V^{2} }{9R^{2} } *2R\\\\P_{A} = \frac{2}{9}( \frac{V^{2} }{R}) \\\\P_{B} = (\frac{V}{3R}) ^{2} * R\\\\P_{B} = \frac{V^{2} }{9R^{2} } *R\\\\P_{B} = \frac{1}{9}( \frac{V^{2} }{R})$

Therefore Pa : Pb = 2: 1, this means that the thermal energy dissipated in A would be twice that in B

4 0

3 years ago

Waves are observed passing under a dock. Wave crests are 8.0 meters apart. The time for a complete wave to pass by is 4.0 second

Debora [2.8K]

<h3>Answer;</h3>

The period of the wave is 4 seconds

<h3>Explanation;</h3>

The period of a wave or periodic time is the time taken for one complete oscillation to occur. In this case, one complete oscillation occurs when the wave moves from one crest to the next or a trough to the next. This takes 4 seconds. Therefore the period is 4 seconds.
Frequency on the other hand is the number of oscillations by a wave in one second. Thus, f = 1/T, that is frequency is the reciprocal of periodic time.

4 0

3 years ago

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Object A has a mass of 100 grams. Object B has a mass of 150 grams. They are both traveling at the same velocity. Which can you

Tanzania [10]

Object B has a greater inertia i think, it has a greater momentum anyway

6 0

3 years ago

Two beams of coherent light travel different paths, arriving at point P. If the destructive interference is to occur at point P,

swat32

Answer:

Explanation:

When two coherent light beams travel different paths and arrive at a point , there will be difference in the length of path travelled by them . If this difference is zero then both will reinforce each other and their brightness will add up . Hence there will be constructive interference .

If their path difference is not zero but it is equal to odd multiple of their half wavelength like λ / 2 , 3 λ / 2 , 5 λ /2 , 7 λ /2 etc , then instead of reinforcing each other , they will destroy each other . This is called destructive interference . As a result of it , darkness will prevail at the point where they meet or interfere.

6 0

3 years ago