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skelet666 [1.2K]
3 years ago
7

earth exerts a downward gravitational force of 8.9 n on a cake that is resting on a plate. the plate exerts a force of 11.0 n up

ward on the cake, and a knife exerts a downward force of 2.1 n on the cale.

Physics
1 answer:
Igoryamba3 years ago
5 0

See the free-body diagram in attachment. (please rotate it such that N points upward)

Explanation:

The free body diagram (FBD) of an object is a diagram representing all the forces acting on a body. Each force is represented using an arrow, where:

- The length of the arrow is proportional to the magnitude of the force

- The direction of the arrow shows the direction of the force

In this problem, we have 3 forces acting on the cake:

- The force of gravity, downward, of magnitude (mg) (where m is the mass of the cake and g is the acceleration of gravity), equal to 8.9 N

- The force exerted by the knife on the cake, F = 2.1 N, acting downward

- The normal reaction exerted by the plate on the cake, N = 11.0 N, acting upward

The 3 forces are shown in the diagram attached. We also notice that the vector sum of all the forces is zero, in fact:

F_{net}=11.0-8.9-2.1=0

This means that the acceleration of the cake is zero, so the cake is in equilibrium.

Learn more about forces and weight here:

brainly.com/question/8459017

brainly.com/question/11292757

brainly.com/question/12978926

#LearnwithBrainly

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Answer:

D. Frequency

Explanation:

The energy of an  electromagnetic wave is proportional to frequency, mathematically it is expressed as;

E ∝ f

E = hf

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The equation above can also be expanded to;

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λ is the wavelength of the electromagnetic wave

Since the speed of light is constant, we can conclude that the energy of the electromagnetic wave is directly proportional to its frequency and inversely proportional to its wavelength.

Therefore, the correct option for direct proportionality is FREQUENCY

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A 60.00-cm guitar string under a tension of 50.000 N has a mass per unit length of 0.100 00 g/cm chegg
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Fundamental frequency,

f=v2l=T/μ−−−−√2l

=(50)/0.1×10−3/10−22×0.6−−−−−−−−−−−−−−−−−−−√

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Let, n th harmonic is the hightest frequency, then

(58.93)n = 20000

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Hence, 339 is the highest frequency.

∴fmax=(339)(58.93)Hz=19977Hz.

<h3>What is frequency?</h3>

In physics, frequency is the number of waves that pass a given point in a unit of time as well as the number of cycles or vibrations that a body in periodic motion experiences in a unit of time. After moving through a sequence of situations or locations and then returning to its initial position, a body in periodic motion is said to have experienced one cycle or one vibration. See also simple harmonic motion and angular velocity.

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