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mel-nik [20]
2 years ago
7

An m = 7.25 kg mass is suspended on a string which is pulled upward by a force of F = 76.7 N as shown in the figure. If the upwa

rd velocity of the mass is 2.25 m/s right now, then what is the velocity 3.50 s later?

Physics
1 answer:
GenaCL600 [577]2 years ago
4 0

The velocity after 30s would be 38. 99 m/s

<h3>How to calculate the velocity</h3>

Using the formula

F = m Δ V/ t

Where, F = force = 76. 7N

m = mass = 7. 25kg

Δv = change in velocity= V2 - V1 and V1 = 2. 25 m/s

t = time = 3. 50s

76. 7 = 7. 25 × (v2 - 2. 25) / 3. 50

76. 7 = 2. 07 × (v2 - 2. 25)

make v2 subject of formula

v2 - 2. 25 = 76. 07 ÷ 2. 07

v2 = 36. 74 + 2. 25

v2 = 38. 99 m/s

Thus, the velocity after 3. 50s would be 38. 99 m/s

Learn more about change in velocity here:

brainly.com/question/10962624

#SPJ1

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The acceleration of the air plane is 3.879 \mathrm{m} / \mathrm{s}^{2}

<u>Explanation:</u>

Given:

The mass of the air plane = 1492.3 kg

Force of each four engine = 1447.5 N

So, the total force of four engines can be calculated as = 4(1447.5) = 5790 N

The force that acts on the object is equal to the product of mass (m) and its acceleration. It can express by the below formula,

                         \text {Force }(F)=m \times \text { acceleration }(a)

The above equation can be written as below to find acceleration,

                        a=\frac{F}{m}

Now. Substitute the given values, we get,

                        a=\frac{5790}{1492.3}=3.879 \mathrm{m} / \mathrm{s}^{2}

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3 years ago
The velocity of sound on a particular day outside is 331 meters/second. What is the frequency of a tone if it has a wavelength o
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3 0
3 years ago
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A billiard ball strikes and rebounds from the cushion of a pool table perpendicularly. The mass of the ball is 0.38 kg The ball
xxTIMURxx [149]

Answer:

Force is 432.94 N along the rebound direction of ball.

Explanation:

Force is rate of change of momentum.

\texttt{Force}=\frac{\texttt{Final momentum-Initial momentum}}{\texttt{Time}}

Final momentum = 0.38 x -1.70 = -0.646 kgm/s

Initial momentum = 0.38 x 2.20 = 0.836 kgm/s

Change in momentum = -0.646 - 0.836 = -1.472 kgm/s

Time = 3.40 x 10⁻³ s

\texttt{Force}=\frac{\texttt{Final momentum-Initial momentum}}{\texttt{Time}}=\frac{-1.472}{3.40\times 10^{-3}}\\\\\texttt{Force}=-432.94N

Force is 432.94 N along the rebound direction of ball.

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3 years ago
person b does twice the work of person a, and in one-half of the time . how does the power output of person b compare to person
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Answer:

Person B has four times the power output of person A.

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valina [46]

Answer:

  • Increases levels of well-being neurotransmitters
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Explanation:

Performing physical activities helps to build a healthy relationship with yourself, in the sense that physical activity promotes health at all levels. Health is a set of physical, mental and social well-being, so physical activity reaches all these levels and increases the quality of life for a person as a whole.

There are several types of physical activities that can be performed and you can choose the one that best fits your preferences and routine. A walk for example can be done in any safe place and at any time and it already helps in improving physical conditioning, in receiving serotonin and endorphins, in reducing blood pressure and protecting the heart and in improving mental health.

So the ideal is for each person to set their own goals in relation to their health and seek to achieve them, either to have a better quality of life, to socialize more with people, to prevent diseases, etc.

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