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balu736 [363]
3 years ago
15

A child operating a radio-controlled model car on a dock accidentally steers it off the edge. The car's displacement 0.91 s afte

r leaving the dock has a magnitude of 7.0 m. What is the car's speed at the instant it drives off the edge of the dock?
Physics
1 answer:
NemiM [27]3 years ago
6 0

Answer:

Explanation:

distance, d = 7 m

time, t = 0.91 s

speed, v = distance / time

v = 7 / 0.91

v = 7.69 m/s

Thus, the speed is 7.69 m/s

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The energy associated with the random motion of molecules or atoms within a substance is
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C

technically B too but youre teachers not that smart so there you go

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Which data set has the largest range?
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Line the numbers from smallest to largest the subtract the smallest from the largest numbers.

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The small piston of a hydraulic lift has a cross-sectional of 3 00 cm2 and its large piston has a cross-sectional area of 200 cm
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Q: The small piston of a hydraulic lift has a cross-sectional of 3.00 cm2 and its large piston has a cross-sectional area of 200 cm2. What downward force of magnitude must be applied to the small piston for the lift to raise a load whose weight is Fg = 15.0 kN?

Answer:

225 N

Explanation:

From Pascal's principle,

F/A = f/a ...................... Equation 1

Where F = Force exerted on the larger piston, f = force applied to the smaller piston, A = cross sectional area of the larger piston, a = cross sectional area of the smaller piston.

Making f the subject of the equation,

f = F(a)/A ..................... Equation 2

Given: F = 15.0 kN = 15000 N, A = 200 cm², a = 3.00 cm².

Substituting into equation 2

f = 15000(3/200)

f = 225 N.

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A tennis ball travels the length of the court 24m in 0.5 s find its average speed
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A capacitor C is fully charged by connecting it to battery of V Volt. Then it is disconnected from battery. If the separation be
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Answer:

Explanation:

i )

When it is disconnected with the battery , the charge stored in it becomes fixed . When the plate distance becomes half , its capacitance becomes twice from C to 2C . Let charge stored in it at the time of disconnection from battery be Q . Let plate separation reduces from d to d / 2

So charged stored in it will remain unchanged .

ii )

Potential difference = charge / capacitance

in the first case potential difference = Q / C

in the second case potential difference = Q / 2C

So potential difference becomes half .

iii ) electric field = potential diff / plate separation

in the first case electric field = Q / (d x C )

in the second case electric field = 2 Q / (d x 2C)

= Q / (d  x C )

So electric field remains unchanged .

iv)

energy stored in first case = Q² / 2C

In the second case energy stored = Q² / 2x2C

so energy stored becomes half .

4 0
3 years ago
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