3 years ago

What if energy, like electricity, could not be converted to other forms like sound, heat, motion, or light?

1 answer:

5 0

Answer: It wouldn't be as modern as today is we would be back to using oil and other things from back then there wouldn't be cars everything would be less machined.

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A girl throws a rock horizontally at 10 m/s from the top of a building, 22 m above street level. Assuming free fall conditions a

MAXImum [283]

Answer:21.18 m

Explanation:

Given

initial speed u=10 m/s

height of building h=22 m

time taken to complete 22 m

$h=ut+\frac{1}{2}at^2$

initial vertical velocity =0

$22=\frac{1}{2}gt^2$

$t=\sqrt{\frac{22\times 2}{g}}$

$t=2.11 s$

Horizontal Distance moved

$R=u_x\times t$

$R=10\times 2.11$

$R=21.18 m$

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3 years ago

How many atoms are in one mole of potassium

Svetach [21]

Answer : 6.022• 10^23 atoms of potassium

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3 years ago

A ball is launched from the ground with a horizontal speed of 30 m/s and a vertical speed of 30 m/s. What will the horizontal sp

gulaghasi [49]

Answer:

Explanation:

horizintal speed stays same

only vertical speed changes

so H speed will stay 30 m/s

6 0

3 years ago

If runner A is running at 7.50 m/s and runner B is running at 7.90 m/s, how long will it take runner B to catch runner A if runn

yaroslaw [1]

Answer:

t= 137.5 s

Explanation:

So if we are wanting to figure out how long it takes runner B to catch runner A. we must first set the slope of each runner equal to one another

<u>Slopes:</u>

Runner A: y = 7.50x + 55

Runner B: y = 7.90 x

sooooo

7.50 x + 55 = 7.90 x

- 7.50 x - 7.50 x

55 = .40 x

55/.40 = .40 x / .40

x = 137.5 s

t= 137.5 s

7.50 * 137.5 + 55 =1086.25 m

7.90 * 137.5 = 1086.25 m

3 0

2 years ago

The motor of a washing machine rotates with a period of 28 ms. What is the angular speed, in units of rad/s?

pentagon [3]

Answer:

2π/[28 x (10^-3)]

Explanation:

Angular speed : ω=2π/T

T = 28ms = 28 x (10^-3) s

Angular speed = 2π/[28 x (10^-3)]

5 0

3 years ago