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sergiy2304 [10]
3 years ago
15

A swimmer is moving upstream (north) against a river current. If she is traveling 2.5 m/s N and the current is 4 m/s South – wha

t is the net velocity?
Physics
1 answer:
amid [387]3 years ago
6 0
Do you know the formula or equation for this
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A 0.954-kg toy car is powered by three D cells (4.50 V total) connected directly to a small DC motor. The car has an effective e
Natasha2012 [34]

Answer:

0.06 A

Explanation:

We have given mass =0.954 kg

velocity =1.27 m/sec

efficiency =0.361 the output kinetic energy of the motor KE=\frac{1}{2}mv^2=\frac{1}{2}\times 0.954\times 1.27^2=0.769\ J

Efficiency =0.361

so input to the motor = output/efficiency

so input to the motor = \frac{0.769}{0.361}=2.1301

we know that P=\frac{E}{T} where E is energy and T is time so P=\frac{2.1301}{7.88}=0.2703W

We know that power P=VI we have given V=4.5 VOLT

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3 0
3 years ago
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How does Newton's second law of motion can be used to calculate the acceleration of an object?
Alex777 [14]

Newton's second law of motion can be formally stated as follows: The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

4 0
4 years ago
When you have two materials with the same index of refraction, it means that
gavmur [86]

Answer:

When you have two materials with the same index of refraction, it means that if they are touched by a ray of light it won't have a chance, and its form would prevail.

Explanation:

The reason behind this is that in the first place. When light passes through an object of certain refraction it is modified from its natural state, allowing it to change in color to the human eye or many other effects in other perceptive elements. However, when the same light passes through two objects with the same refraction due to their physical characteristics, it doesn't change because once it comes out of the first one it will suffer the same effect from the last one. For it to change the refraction would have to be higher or lower. Then it would be modified. The reason is because the dimensions are not modified. Because at some point the ray of light has to come out of the first one to enter the second one.

3 0
3 years ago
Please select the word from the list that best fits the definition
d1i1m1o1n [39]

Answer:

inertia

Explanation:

the resistance of an object to moving or to stopping

a. gravity

b. inertia

c. gravitational force

7 0
2 years ago
Is water wet? I think it is but people think it isn’t
alexandr402 [8]
Water<span> isn't </span>wet<span>. Wetness is a description of our experience of </span>water<span>; what happens to us when we come into contact with </span>water<span> in such a way that it impinges on our state of being. We or our possessions get </span>wet
4 0
3 years ago
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