(12 points) When forces are UNBALANCED on an object, the object could: (Choose all that apply)
1 answer:
As per Newton's law when unbalanced force is acting on the object
so acceleration of the object is given as
since object is accelerating here so we can say that due to unbalanced force there must be change in velocity of the object
So correct answer regarding change in velocity must be given as
<u>3. Decelerate </u>
<u>4. Stop moving </u>
<u>5. Accelerate </u>
<u>7. Start moving</u>
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Answer:
145 m
Explanation:
Given:
Wavelength (λ) = 2.9 m
we know,
c = f × λ
where,
c = speed of light ; 3.0 x 10⁸ m/s
f = frequency
thus,
substituting the values in the equation we get,
f = 1.03 x 10⁸Hz
Now,
The time period (T) =
or
T = = 9.6 x 10⁻⁹ seconds
thus,
the time interval of one pulse = 100T = 9.6 x 10⁻⁷ s
Time between pulses = (100T×10) = 9.6 x 10⁻⁶ s
Now,
For radar to detect the object the pulse must hit the object and come back to the detector.
Hence, the shortest distance will be half the distance travelled by the pulse back and forth.
Distance = speed × time = 3 x 10^8 m/s × 9.6 x 10⁻⁷ s) = 290 m {Back and forth}
Thus, the minimum distance to target = = 145 m