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3 years ago

7

You raise a bucket of water from the bottom of a deep well. if your power output is 100 w, and the mass of the bucket and the wa

ter in it is 3.50 kg, with what speed can you raise the bucket? ignore the weight of the rope.

1 answer:

NikAS [45]3 years ago

5 0

Recall
power = Force × speed
100 = 3.5×10 × V
V = 100÷35 = 2.86 ms-¹

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Suppose a plane accelerates from rest for 30 s, achieving a takeoff speed of 80 m/s after traveling a distance of 1200 m down th

Margaret [11]

Answer:

300 m

Explanation:

The train accelerate from the rest so u = 0 m/sec

Final speed that is v = 80 m/sec

Time t = 30 sec

The distance traveled by first plane = 1200 m

We know the equation of motion $S=ut+\frac{1}{2}at^2$ where s is distance a is acceleration and u is initial velocity

Using this equation for first plane $1200=0\times 30+\frac{1}{2}a30^2$

$a=2.67\frac{m}{sec^2}$

As the acceleration is same for both the plane so a for second plane will be 2.67 $\frac{m}{sec^2}$

The another equation of motion is $v^2=u^2+2as$ using this equation for second plane $40^2=0+2\times 2.67\times s$

s = 300 m

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2 years ago

Two metal spheres are suspended from strings. The

nikdorinn [45]

Answer:

B. A repulsive force of 8.0*10^3 N.

Explanation:

As we know by Coulomb's law that the electrostatic force between two charges is given as

$F = \frac{kq_1q_2}{r^2}$

here we know that

$q_1 = -2 \times 10^2 C$

$q_2 = -4 \times 10^{-8} C$

r = 3.0 m

now we have

$F = \frac{(9 \times 10^9)(2 \times 10^2)(4\times 10^{-8})}{3^2}$

$F = 8000 N$

since both charges are similar charges so they will repel each other by the force we calculated above so correct answer will be

B. A repulsive force of 8.0*10^3 N.

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2 years ago

In the middle of a thunderstorm, a lightning bolt flashes. It takes Roberto 5 seconds to

Gemiola [76]

Answer:

v = 344.1 m / s

d = 1720.5 m

Explanation:

For this problem we must calculate the speed of sound in air at 22ºC

v = 331 RA (1+ T / 273)

we calculate

v = 331 RA (1 + 22/273)

v = 344.1 m / s

the speed of the wave is constant,

v = d / t

d = v t

we calculate

d = 344.1 5

d = 1720.5 m

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2 years ago

A scientific law is based on repeated inferences made over long periods of time. Please select the best answer from the choices

sergiy2304 [10]

It would be true
I believe

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3 years ago

Read 2 more answers

F1=160N east and F2=50N west, if the acceleration of the object is 3.5 m/s2 what is the mass of the object?

Svetlanka [38]

The mass of the object is the answer of your question

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3 years ago