1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Sauron [17]
3 years ago
7

Please help with a step by step method ​

Physics
1 answer:
Elan Coil [88]3 years ago
3 0

Answer:

Explanation:

This is a First Law of thermodynamics problem. We have to remember that the total energy available to a system is constant throughout the whole problem and that energy cannot be created or destroyed. So we need to find the total energy available right at the start. Well it just so happens that we are told that the total energy is 1000J and that it is all potential energy when the sphere is at rest and is 25 m off the ground. If the object isn't moving, all the energy is potential until it starts moving and the energy begins to convert from potential to kinetic a little bit at a time. The thing that we don't know is the mass of the shpere. Begin with the fact that the PE = 1000 (I'm going to se 2 sig fig's since there's only 1 in 1000). If

PE = 1000 and PE = mgh, then

1000 = m(9.8)(25) so

m = 4.1 kg

We also need the height at which this sphere has a PE of 600. Again, if

PE = 600 and PE = mgh, then

600 = (4.1)(9.8)h so

h = 15 Filling in the total energy equation now, using the fact that the total energy available to the system is 1000J:

TE = PE + KE and

1000 = (4.1)(9.8)(15) + \frac{1}{2}(4.1)v^2 and we are looking for v.

1000 = 6.0 × 10² + 2.1v² so

v=\sqrt{\frac{1000-6.0*10^2}{2.1} } and

v=\sqrt{\frac{4.0*10^2}{2.1} } gives us

v = 14 m/s

You might be interested in
Importance of simple machines pleasecgive answer in points​
oksian1 [2.3K]

Answer:

Explanation:

The inclined plane

An inclined plane consists of a sloping surface; it is used for raising heavy bodies. The plane offers a mechanical advantage in that the force required to move an object up the incline is less than the weight being raised (discounting friction). The steeper the slope, or incline, the more nearly the required force approaches the actual weight. Expressed mathematically, the force F required to move a block D up an inclined plane without friction is equal to its weight W times the sine of the angle the inclined plane makes with the horizontal (θ). The equation is F = W sin θ.

The lever

A lever is a bar or board that rests on a support called a fulcrum. A downward force exerted on one end of the lever can be transferred and increased in an upward direction at the other end, allowing a small force to lift a heavy weight.

The wedge

A wedge is an object that tapers to a thin edge. Pushing the wedge in one direction creates a force in a sideways direction. It is usually made of metal or wood and is used for splitting, lifting, or tightening, as in securing a hammer head onto its handle.

The wheel and axle

A wheel and axle is made up of a circular frame (the wheel) that revolves on a shaft or rod (the axle). In its earliest form it was probably used for raising weights or water buckets from wells.

Its principle of operation is best explained by way of a device with a large gear and a small gear attached to the same shaft. The tendency of a force, F, applied at the radius R on the large gear to turn the shaft is sufficient to overcome the larger force W at the radius r on the small gear. The force amplification, or mechanical advantage, is equal to the ratio of the two forces (W:F) and also equal to the ratio of the radii of the two gears (R:r)

7 0
3 years ago
If the temperature of an iron sphere is increased A)its density will decrease .B)its volume will decrease. C)its mass will decre
babymother [125]

Answer:

A) Its density will decrease

Explanation:

When an object is heated, its volume increases. This is due to the fact that the particles in the medium vibrate more (if it is a solid) or they move more (if it is a liquid or a gas), therefore they tend to occupy a larger space.

At the same time, the mass of the object does not change, because the mass just represents the amount of matter contained in the object, so it does not increase/decrease at different temperatures.

The density of an object is defined as the ratio between the mass (m) and the volume (V):

d=\frac{m}{V}

We said that the mass remains unchanged while the volume increases: since the density is inversely proportional to the volume, this means that the density decreases.

5 0
3 years ago
Read 2 more answers
A temporary license permits the holder to drive for up to _ days while the application is reviewed
Ugo [173]
60 days, tell me if I'm correct please.
7 0
3 years ago
Find the force on an object which has the mass of 20kg and an acceleration of 10m/s
Elis [28]

Answer:

200 Newtons

Explanation:

20 kg x 10 m/s squared

4 0
3 years ago
Modern human lifestyle depends on fossil fuels to generate electricity. Predict and explain the long term effect on the environm
Anit [1.1K]
Fossil fuels <span>are </span>non-renewable sources of energy<span> as they are derived from pre-historic fossils and it is certain that they will deplete in the near future. </span><span>
The bigegst disadvantage of the fossil fuels is that they release carbon dioxide, nitrogen dioxide, sulfur dioxide, carbon monoxide </span><span> gasses, which lead to </span>serious environmental issues<span> such as </span>air pollution. They are <span>responsible for the </span>global warming<span>..
</span><span>Besides the environmental effect, carbon dioxide can also cause serious health complications such as chronic asthma, low lung functioning, chronic bronchitis..</span>
3 0
3 years ago
Other questions:
  • Gina estimates that her moms truck weighs about 6,000 pounds. How can you write 6,000 using exponents?
    8·2 answers
  • Which one of the following statements regarding strength training workouts is most accurate
    6·1 answer
  • The vertical displacement of the wave is measured from the ?
    15·1 answer
  • A solid conducting sphere carrying charge q has radius a. It is inside a concentric hollow conducting sphere with inner radius b
    5·1 answer
  • Can you have zero displacement and nonzero average velocity? Zero displacement and nonzero velocity? Illustrate your answers on
    12·1 answer
  • Science is two things. Describe what those two things are.
    5·1 answer
  • If the force applied to an object is
    15·1 answer
  • A block slides on a frictionless, horizontal surface with a speed of 1.32 m/s. The block encounters an unstretched spring and co
    14·1 answer
  • Determine the weight of a 5.1 kg scooter that moves with a constant acceleration of 3.0 ms2. (Make sure you use the weight equat
    9·1 answer
  • Which of the graphs describes the motion of a person who first rode her bicycle at constant speed and then rested?
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!