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oksian1 [2.3K]
3 years ago
13

A 5.22-kg object passes through the origin at time t = 0 such that its x component of velocity is 5.10 m/s and its y component o

f velocity is -2.82 m/s. (a) what is the kinetic energy of the object at this time?
Physics
1 answer:
Mamont248 [21]3 years ago
4 0

The magnitude of the object's velocity is

         √ (5.1² + 2.82²)  =  √ (33.9624)  =  5.828 m/s .

Kinetic energy = (1/2) (M) (speed²)

                       =  (1/2) (5.22 kg) (5.828 m/s)²

                       =     (2.61 kg) (33.9624 m²/s²)

                       =          88.64    kg-m²/s²

                       =          88.64  Joules
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7 0
3 years ago
A golf ball starts with a speed of 2 m/s and slows at a constant rate of 0.5 m/s2, what is its velocity after 2 s?​
jeka57 [31]

Answer:

3m/s

Explanation:

Given parameters:

Initial speed  = 2m/s

Acceleration  = 0.5m/s²

Time  = 2s

Unknown:

Final speed  = ?

Solution:

To solve this problem, we apply the right motion equation;

     V  = U + at

V is the final speed

U is the initial speed

a is the acceleration

t is the time

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      V = 2 + 1

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8 0
3 years ago
A horizontal clothesline is tied between 2 poles, 16 meters apart. When a mass of 3 kilograms is tied to the middle of the cloth
Alla [95]

Answer:

The magnitude of the tension on the ends of the clothesline is 41.85 N.

Explanation:

Given that,

Poles = 2

Distance = 16 m

Mass = 3 kg

Sags distance = 3 m

We need to calculate the angle made with vertical by mass

Using formula of angle

\tan\theta=\dfrac{8}{3}

\thta=\tan^{-1}\dfrac{8}{3}

\theta=69.44^{\circ}

We need to calculate the magnitude of the tension on the ends of the clothesline

Using formula of tension

mg=2T\cos\theta

Put the value into the formula

3\times9.8=2T\times\cos69.44

T=\dfrac{3\times9.8}{2\times\cos69.44}

T=41.85\ N  

Hence, The magnitude of the tension on the ends of the clothesline is 41.85 N.

4 0
4 years ago
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Explanation:

You walk 53m to the north, then you turn 60° to your right and walk another 45m. Determine the direction of your displacement vector. Express your answer as an angle relative to east

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A 2000 kg car moves down a level highway under the actions of two forces. one is a 1060 n forward force exerted on the drive whe
kipiarov [429]
Refer to the diagram shown below.

The net force acting on the vehicle is
F - R = 1060 -1010 = 50 N

The distance traveled is 21 m. Because the force is constant, the work done is
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Assume that energy is not dissipated by air resistance or otherwise.
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The KE is
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Answer: 1.025 m/s

3 0
4 years ago
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