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Wewaii [24]
2 years ago
11

Two men standing on the same side of wall and at the same distance from It, such that they are 4oom apart when one fires a gun t

he other hears the first report in 1.2s and the second in 0.5s after the first. calculate 1) Velocity of sound in air . 2)the perpendicular distance of the men from the wall.
​
Physics
1 answer:
Mamont248 [21]2 years ago
8 0

Answer:

1. 571.43m/s

2. 142.9m and 342.9m

Explanation:

1.Take the difference in time.

1.2-0.7=0.7 seconds

Take the distance between them and divide with differnce in time.

400÷0.7=571.43 seconds.

2.Take the time of the two men and divide by two.

0.5÷2= 0.25 secs

1.2÷2= 0.6 secs

multiply each with the velocity.

0.25×571.43=142.9m

0.6×571.43=342.9m

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Answer:

I found the experience tasking

Explanation:

I wouldn't say it was hard, neither was it easy. I'd rather go for something like it being tasking. It's worthy of note that it was my first time, and I think it's very normal especially when one hasn't been doing something of that nature previously. Of course I did my draft, which unsurprisingly happened to be not good enough, and I had to look for templates to guide me through the acceptable way.

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3 years ago
A 2kg object is moving horizontally with a speed of 4 m/s. How much net force is required to keep the object moving at this spee
Elza [17]
We can solve this problem using the force equation.

Force = Mass * Acceleration

2kg * 4m/s = 8 N

The net force required to keep the object moving at this speed and in this direction is 8 N.


8 0
3 years ago
Read 2 more answers
When 30 V is applied across a resistor it generates 600 W of heat: what is the magnitude of its resistance?
grandymaker [24]

Answer:

<h2>1.5 ohms</h2>

Explanation:

Power is expressed as P = V²/R

R = resistance

V = supplied voltage

Given P = 600W and V = 30V

R = V²/P

R = 30²/600

R = 900/600

R = 1.5ohms

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3 0
3 years ago
A child bounces in a harness suspended from a door frame by three elastic bands. If each elastic band stretches 0.300 m while su
WINSTONCH [101]

Answer:

The force constant for each elastic band is 77.93 N/m

Explanation:

Hooke's law of a spring or an elastic band gives the relation between elastic force (Fe) and stretching (x), the magnitude of that force is:

F_{e}= kx (1)

With k, the elastic force constant. The three elastic bands support the child’s weight (W) and maintain him at rest, so by Newton’s second law for one of the elastic bands:

\sum F=0 (2)

\frac{W}{3}-F_{e}=0\Rightarrow F_{e}=\frac{W}{3} (3)

Using (1) on (3):

kx=\frac{W}{3}\Rightarrow k=\frac{mg}{3x}(4)

k=\frac{7.15\,kg*9.81\,\frac{m}{s^{2}}}{3*0.300\,m}\simeq\mathbf{77.93\frac{N}{m}}

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3 years ago
1:What kind of energy does your body use to keep you warm.
Zigmanuir [339]

Answer:

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2. Batteries and coal

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