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12345 [234]
2 years ago
9

Select the correct answer. You travel in a circle, whose circumference is 8 kilometers, at an average speed of 8 kilometers/hour

. If you stop at the same point you started from, what is your average velocity? A. 0 kilometers/hour B. 2 kilometers/hour C. 4 kilometers/hour D. 8 kilometers/hour E. 16 kilometers/hour
Physics
1 answer:
BlackZzzverrR [31]2 years ago
7 0

Answer:

Since velocity is a vector quantity there is no net displacement and the average velocity is zero

(A) is correct

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explain why a high-speed collision between two cars would cause more damage than a low-speed collision between the same two cars
9966 [12]
The force equation can easily prove this.  F=ma.  This states that the force on an object is equal to mass times acceleration.  If the mass stays the same and the velocity of the cars increases than that means there is a larger force.  This is because in both cases the cars are stopping in almost an instant and the times of the crashes are theoretically identical.  Acceleration is the change in velocity over time.  If the velocity is higher with the same amount of time than that means there is a higher acceleration.  If you plug a higher acceleration into the force equation then you wind up with a higher force and in turn a more damaging collision.
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4 years ago
A student shakes a rope such that 20 complete vibrations are made in 4.00 seconds. Determine the vibrational frequency of the ro
fgiga [73]

Answer:

The vibrational frequency of the rope is 5 Hz.

Explanation:

Given;

number of complete oscillation of the rope, n = 20

time taken to make the oscillations, t = 4.00 s

The vibrational frequency of the rope is calculated as follows;

Frequency = \frac{number \ of \ complete \ vibrations}{time \ taken} \\\\Frequency = \frac{20 }{4 \ s} \\\\Frequency = 5 \ Hz

Therefore, the vibrational frequency of the rope is 5 Hz.

8 0
3 years ago
A car of mass of 1000 ks in accelerating at 2 ms. What resultant force acts on the car? If the
Debora [2.8K]

Answer:

Explanation:

Opp

7 0
3 years ago
As a dilligent physics student, you carry out physics experiments at every opportunity. At this opportunity, you carry a 1.39-m-
grin007 [14]

Answer:

The strength of magnetic field is 6.21 \times 10^{-5} T

Explanation:

Given:

Length of rod l = 1.39 m

Velocity v = 3.37 \frac{m}{s}

Induced emf = 0.291 \times 10^{-3} V

According to the faraday's law

Induced emf = Blv

We have to find strength of the magnetic field,

   B = \frac{0.291 \times 10^{-3} }{1.39 \times3.37}

   B = 6.21 \times 10^{-5} T

Therefore, the strength of magnetic field is 6.21 \times 10^{-5} T

7 0
4 years ago
An electric kettle is rated at 2kW. How much energy is transferred in 30s?
jenyasd209 [6]

<em>answer \\  = 30000 \: joule \\ solution \\ p =  \frac{energy}{time}  \\ power = 2kw = 2000 \: w = 2000j/s \\ (since \: 1 \: kw = 1000 \: j / s) \\ energy \: transformed \\  = power \times time \\  = 1000 \:j /s \times 30 \: s \\  = 30000 \: joule \\ hope \: it \: helps</em>

5 0
4 years ago
Read 2 more answers
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