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2 years ago

5

A ball moving horizontally across my desk rolls off at a velocity of 3.3 m/s. Assuming my desk is a height of 0.81 m, how long w

ill the ball be in the air?
Answer in units of seconds. Assume acceleration due to gravity is -9.81 m/s^2

1 answer:

kogti [31]2 years ago

3 0

Answer:

girl what- I can't answer this but I need points so I'ma just put this random lol sorry tho . ask the tutor

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A sodium atom will absorb light with a wavelength near 589 nm if the light is within 10 MHz of the resonant frequency. The atomi

Troyanec [42]

Answer:

i)20369 photons

ii) 40 ps

Explanation:

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In other to stop it, it must absorb the same momentum in photons:

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Now, for the minimun time, we use the speed of light and the wavelength. For the n photons:

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Question 1 of 7What is the change in internal energy if 90 J of thermal energy is added to asystem, and the system does 30 J of

Dmitriy789 [7]

Given:

The thermal energy added to the system is Q = 90 J

The work done by the system on the surroundings is W = 30 J

To find the change in internal energy.

Explanation:

According to the first law of thermodynamics, the change in internal energy can be calculated by the formula

$\Delta U=\text{ Q-W}$

On substituting the values, the change in internal energy will be

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