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Zinaida [17]
3 years ago
11

How much work must be done on a 24-kg shopping cart to increase its speed

Physics
1 answer:
lisov135 [29]3 years ago
8 0

Answer:

The work done by the shopping cart is 180 J  

Explanation:

We have,

Mass of a shopping cart is 24 kg

Initial speed of cart is 1 m/s

Final speed of a cart is 4 m/s

It is required to find the work done by the shopping cart. The work done by an object is also equal to the change in its kinetic energy as per work -energy theorem. It means,

W=\dfrac{1}{2}m(v^2-u^2)

m = 24 kg

u = 1 m/s and v = 4 m/s

W=\dfrac{1}{2}\times 24\times (4^2-1^2)\\\\W=180\ J

So, the work done by the shopping cart is 180 J.

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3 years ago
A certain 48 V electric forklift can lift up to 7000 lb at a
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256.25 A

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2 years ago
A ball that is attached to a string travels in a horizontal, circular path, as shown in Figure 1. At time t0 , the ball has a sp
Levart [38]

Answer:

F₁ = 4 F₀

Explanation:

The force applied on the string by the ball attached to it, while in circular motion will be equal to the centripetal force. Therefore, at time t₀, the force on ball F₀ is given as:

F₀ = mv₀²/r   --------------- equation (1)

where,

F₀ = Force on string at t₀

m = mass of ball

v₀ = speed of ball at t₀

r = radius of circular path

Now, at time t₁:

v₁ = 2v₀

F₁ = mv₁²/r

F₁ = m(2v₀)²/r

F₁ = 4 mv₀²/r

using equation (1):

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5 0
3 years ago
Un movil avanza a 20 m/s y recorre una distancia de 800 km. Determinar el tiempo en horas que utiliza
Nataly_w [17]

Answer:

t = 11.1 hours

Explanation:

The question says that, "A mobile advances at 20 m / s and travels a distance of 800 km. Determine the time in hours you use".

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Distance, d = 800 km

We know that,

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So,

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So, it will take 11.1 hours.

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3 years ago
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insens350 [35]

Answer:

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3 years ago
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