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3 years ago

11

In a typical lightning strike, 2.5 C flows from cloud to ground in 0.20 ms. What is the current during the strike? (The answer i

s not 12500 or 1250)

1 answer:

Snezhnost [94]3 years ago

3 0

Current = (charge) / (time) = (2.5) / (0.0002) = <em>12,500 Amperes</em>

The only thing wrong with the answer "12500" is that it lacks a unit.

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A projectile is to be launched at an angle of 30° so that it falls beyond the pond of length 20 meters as shown in the figure.

marin [14]

Answer: A

Explanation:

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2 years ago

A 0.68 kg squirrel is resting on a branch 8 meters above the ground. What is the gravitational potential energy of a squirrel? A

ANEK [815]

Answer:

The gravitational potential energy of a squirrel is 53.312 J.

Explanation:

We have,

Mass of a squirrel is 0.68 kg

It is placed at a height of 8 m above the ground.

It is required to find the gravitational potential energy of a squirrel. It is possessed by an object due to its position. Its formula is given by :

$E=mgh\\\\E=0.68\times 9.8\times 8\\\\E=53.312\ J$

So, the gravitational potential energy of a squirrel is 53.312 J.

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3 years ago

A uniform metal tube of length 5m and mass 9kg is suspended by two vertical wires attached at 50cm and 150cm respectively from t

Elena-2011 [213]

Answer:

force (tension) of 29.4 N (upward) in 100 cm

force (tension) of 58.4 N (upward) in 200 cm

Explanation:

Given:

Length of tube = 5 m (500 cm)

Mass of tube = 9

Suspended vertically from 150 cm and 50 cm.

Computation:

Force = Mass × gravity acceleration.

Force = 9.8 x 9

Force = 88.2 N

So,

Upward forces = Downward forces

D1 = 150 - 50 = 100 cm

D2 = 150 + 50 = 200 cm

And F1 = F2

F1 x D1 = F2 x D2

F1 x 100 = F2 x 200

F = 2F

Total force = Upward forces + Downward forces

3F = 88.2

F = 29.4 and 2F = 58.8 N

force (tension) of 29.4 N (upward) in 100 cm

force (tension) of 58.4 N (upward) in 200 cm

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4 years ago

A car travels 30 km north in 25 min. and 40 km east in 35 min. What is the total time in hours? Be careful to carry over the pro

inna [77]

25+35=60mins so 1.0 hours

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4 years ago

Read 2 more answers

If the mass of an average human adult is 75kg what is the mass in grams

AveGali [126]

1 kg = 1,000 grams

To get 75kg in units of grams, we just multiply 75 by 1,000

75* 1,000 = 75,000 grams

3 0

4 years ago

Read 2 more answers