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3 years ago

Please Help Conservation of energy

Physics

1 answer:

Sonja [21]3 years ago

8 0

Answer:

a principle stating that energy cannot be created or destroyed, but can be altered from one form to another.

Explanation:

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9. A soft drink distibutor drove west 11 km from Minnehaha to Nut Plains. She then turned around and drove back east for 209 km

guajiro [1.7K]

Answer:

220km

Explanation:

Given parameters:

Distance traveled from Minnehaha to Nut Plains = 11km

Distance traveled to Dover = 209km

Unknown:

The distance the soft drink distributor traveled = ?

Solution:

To solve this problem, we must understand that distance is the total length of path covered in a journey.

So;

Distance = 209km + 11km = 220km

The soft drink distributor covered 220km

3 0

3 years ago

A running back holds 0.25 kg football and runs 100m down the football field. In addition to scoring six points for his team, he

katrin2010 [14]

Answer:

<h2>1) there is no work done on the system</h2><h2>2) A) Using a lever to lift 100 newtons up to 4 meters on to a shelf</h2><h2 /><h2>3) P = 140 W</h2><h2>4) D) In a closed system, a system that isolated from its surrounds, the total energy of the system is conserved</h2>

Explanation:

1) As we know that work done is the product of force and the displacement of the point of action where force is applied

So here we have

$W = 0$

as there is no displacement in the direction where the force is applied

2)As we know that work is product of force and displacement

So we will have

$W_1 = 100 \times 4 = 400 J$

$W_2 = 200 \times 1 = 200 J$

$W_1 = 200 \times 1 = 200 J$

$W_1 = 100 \times 3 = 300 J$

So maximum work is done on

A) Using a lever to lift 100 newtons up to 4 meters on to a shelf

As we know that power is rate of work done

so we have

$P = \frac{W}{t}$

$P = \frac{420}{3}$

$P = 140 W$

As per energy conservation we know that

D) In a closed system, a system that isolated from its surrounds, the total energy of the system is conserved

5 0

3 years ago

A small block of mass m on a horizontal frictionless surface is attached to a horizontal spring that has force constant k. The b

Rashid [163]

Answer:

$v_{max} = |d|\cdot \sqrt{\frac{k}{m} }$

Explanation:

The maximum speed of the block occurs when spring has no deformation, that is, there is no elastic potential energy, which can be remarked from appropriate application of the Principle of Energy Conservation:

$\frac{1}{2}\cdot k \cdot d^{2} = \frac{1}{2}\cdot m \cdot v^{2}$

$k \cdot d^{2} = m\cdot v^{2}$

$v_{max} = |d|\cdot \sqrt{\frac{k}{m} }$

5 0

3 years ago

How much work is done to lift a 3N box to a shelf 2m above the ground

Kaylis [27]

When the box IS on the shelf 2m above the ground,
its potential energy is

(weight) x (height) = (3 N) x (2 m) = 6 joules .

THAT's the work you have to do, to lift the box up to there.

6 0

3 years ago

two identical steel balls mounted on wooden posts initially have different amounts of charge, one with -14uC and the other with

GrogVix [38]

According to the Law of Conservation of Charge, the net charge remains constant. If both things have different charges, upon contact, they would share the charge equally. In this case, the total charge is -16μC. The final charge for each ball would be -8 μC.

7 0

3 years ago

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