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3 years ago

14

A softball and a ping-pong ball are dropped off of a tall building. Which statement describes in what order they hit the ground

and why?

1 answer:

S_A_V [24]3 years ago

8 0

Answer:

The softball hits the ground first because it is less affected by air resistance.

Explanation:

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3. Name and describe 3 things that can occur when light hits and object. Provide an example of each.

Katarina [22]

It bounces off one another and goes back in forth

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3 years ago

Calculate the minimum average power output necessary for a person to run up a 12.0 m long hillside, which is inclined at 25.0° a

Viktor [21]

Answer:

Power, P = 924.15 watts

Explanation:

Given that,

Length of the ramp, l = 12 m

Mass of the person, m = 55.8 kg

Angle between the inclined plane and the horizontal, $\theta=25^{\circ}$

Time, t = 3 s

Let h is the height of the hill from the horizontal,

$h=l\ sin\theta$

$h=12\times \ sin(25)$

h = 5.07 m

Let P is the power output necessary for a person to run up long hill side as :

$P=\dfrac{E}{t}$

$P=\dfrac{mgh}{t}$

$P=\dfrac{55.8\times 9.8\times 5.07}{3}$

P = 924.15 watts

So, the minimum average power output necessary for a person to run up is 924.15 watts. Hence, this is the required solution.

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3 years ago

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aivan3 [116]

The arrow in chemical equation means 'turns into' i think

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3 years ago

Read 2 more answers

The voltage in a circuit can be determined from the ____, total resistance, and capacitance

Dmitrij [34]

I think the answer is D, but I’m not at all sure :l

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4 years ago

It costs $336.384 to run a given giant screen TV all the time for 365 days. By choosing to use your TV's power-saving feature, t

vlabodo [156]

Answer:

The amount saved in a year is $ 278.6.

Explanation:

current, I = 0.275 A

Voltage, V = 120 V

cost = $ 0.20 per kWh

The energy spent in 1 year is given by

E = V I t

E = 120 x 0.275 x 365 x 24 x 3600

E = 1.04 x 10^9 J

1 kWh = 3.6 x 10^6 J

So,

E = 288.9 kWh

So, the cost is

C = $ 0.2 x 288.9 = $ 57.78

So, the amount saved = $ 336.384 - $ 57.78 = $ 278.6

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3 years ago