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Ivanshal [37]
3 years ago
13

A ball is projected upward at time t = 0.0 s from a point on a roof 90 m above the ground. The ball rises, then falls and strike

s the ground. The initial velocity of the ball is The velocity of the ball when it is above the ground is about _____: -64 m/s
-81 m/s
-97 m/s
-32 m/s
-48 m/s
Physics
1 answer:
ASHA 777 [7]3 years ago
7 0
The answer is -32 hope it helps
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The amount of matter in an object is called its, mass. How much the mass weights would be referred to as weight
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Answer:

I'd go for 'Marie drives a car'

Explanation:

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What is the wavelength of a monochromatic light beam, where the photon energy is 2.70 × 10^−19 J? (h = 6.63 ×10^−34 J⋅s, c = 3.0
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Answer:

Wavelength = 736.67 nm

Explanation:

Given

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The relation between frequency and wavelength is shown below as:

c = frequency × Wavelength

Where, c is the speed of light having value = 3×10⁸ m/s

So, Frequency is:

Frequency = c / Wavelength

So,  Formula for energy:

Energy=h\times \frac {c}{\lambda}

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c = 3×10⁸ m/s

h = 6.63 x 10⁻³⁴ J.s

Thus, applying in the formula:

2.70\times 10^{-19}=6.63\times 10^{-34}\times \frac {3\times 10^8}{\lambda}

Wavelength = 736.67 × 10⁻⁹ m

1 nm = 10⁻⁹ m

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<u>Wavelength = 736.67 nm</u>

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3 years ago
How many atoms are in a sample of 2.39 moles of neon (Ne) atoms?
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A worker does 25 J of work lifting a bucket, then sets the bucket back down in the same place. What is the total net work done o
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Answer:

0 J

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