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3 years ago

According to the law of conservation of energy, energy cannot be _____.

Physics

2 answers:

OleMash [197]3 years ago

6 0

Answer: The correct answer is "created or destroyed".

Explanation:

Law of conservation of energy: It states that the energy is neither created nor destroyed. It can only be converted from form of energy to the another form of energy.

For example, the water is storage at certain height. It has potential energy due to its position. When it is made to fall on the turbine then the potential energy gets converted into kinetic energy. The kinetic energy is due to the motion.

The kinetic energy is used to bring the turbine in motion.

In this case, the potential energy is converted into kinetic energy. The energy is converted from one form to the another form.

Therefore, the correct option is (C).

DaniilM [7]3 years ago

6 0

Answer: B ; created and destroyed

Explanation:

According to the law of conservation of energy, energy can neither be created nor destroyed but can be converted from one form to another

Which simply means you can't create energy and at the same time you can't destroy it.

An energy can be converted from one form to another that is from potential energy to kinetic energy

There is no destruction of energy in such a process

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Jerry the mouse is running along a straight desert road at a constant velocity of 18 m/s. If a certain Tom cat wants to capture

Kruka [31]

Answer:

a) t = 1.75 s

b) x = 31.5 m

Explanation:

a) The time at which Tom should drop the net can be found using the following equation:

$y_{f} = y_{0} + v_{oy}t - \frac{1}{2}gt^{2}$

Where:

$y_{f}$ : is the final height = 0

y₀: is the initial height = 15 m

g: is the gravity = 9.81 m/s²

$v_{0y}$ : is the initial vertical velocity of the net = 0 (it is dropped from rest)

$0 = 15m - \frac{1}{2}9.81 m/s^{2}*t^{2}$

$t = \sqrt{\frac{2*15 m}{9.81 m/s^{2}}} = 1.75 s$

Hence, Tom should drop the net at 1.75 s before Jerry is under the bridge.

b) We can find the distance at which is Jerry when Tom drops the net as follows:

$v = \frac{x}{t}$

$x = v*t = 18 m/s*1.75 m = 31.5 m$

Then, Jerry is at 31.5 meters from the bridge when Jerry drops the net.

I hope it helps you!

3 0

3 years ago

A 15.0-kilogram mass is moving at 7.50 meters per second on a horizontal, frictionless surface. What is the

Mars2501 [29]

The answer is 570 J. The kinetic energy has the formula of 1/2mV². The total work in this process W= 1/2m(V2²-V1²) = 1/2 * 15.0 * (11.5²-7.50²) = 570 J.

7 0

4 years ago

A girl on roller skates accelerates at a rate of 2 m/sec/sec with a force of 100 N. What is her mass?

Dvinal [7]

By the newtons Second Law:

F = ma

Solving for m:

m = F / a

m = 100 N / 2 m/s²

<h3>m = 50 kg → ANSWER</h3>

8 0

3 years ago

A typical tire for a compact car is 22 inches in diameter. If the car is traveling at a speed of 60 mi/hr, find the number of re

Softa [21]

Answer:

rpm= 916.7436 rev/min

Explanation:

First determine the perimeter of the wheel, to know the horizontal distance it travels in a revolution:

perimeter= π×diameter= π × 22 inches × 0.0254(m/inche)= 1.7555m

Time we divide the speed of the car, which is the distance traveled horizontally over time unit, by the perimeter of the wheel that is the horizontal distance traveled in a revolution, this dates us the revolutions over the time unit:

revolutions per time= velocity/perimeter

velocity= (60 mi/hr) × (1609.34m/mi) = 96560m/h

revolutions per time= (96560.6m/h) / (1.7555m)= 55004.614 rev/hr

rpm= (55004.614 rev/hr) × (hr/60min)= 916.7436 rev/min

3 0

4 years ago

What is the acceleration of a vehicle that travels at a steady speed of 100 KM/HR for 10 seconds?

masya89 [10]

Answer:

Since (average) acceleration = (change in velocity)/(time it takes), the car's acceleration = (100 km/h)/(10 s) = 10 km/h/s. This means that, on the average, the car's velocity changed by 10 km/h each second.

Explanation:

6 0

3 years ago