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
aivan3 [116]
3 years ago
11

The dial of a scale looks like this: 00.0kg. A physicist placed a spring on it. The dial read 00.6kg. He then placed a metal cha

in on the scale, it read 02.1kg. The physicist, then decided to test Einstein’s equation, and compressed the spring and tied it with the chain and placed it on the scale. It read 02.7kg. Which of the following conclusions is the most likely the physicist will come to?
a. Einstein's equation has an error
b. The scale is broken
c. Compressing the spring didn't add energy
d. The scale's resolution is too low to read the change in mass
Physics
1 answer:
saveliy_v [14]3 years ago
8 0

Answer:

d. The scale's resolution is too low to read the change in mass

Explanation:

If we want to find the change in energy of the spring, we will have to use the Hooke's Law. Hooke's Law states that:

F = kx

since,

w = Fd

dw = Fdx

integrating and using value of F, we get:

ΔE = (0.5)kx²

where,

ΔE = Energy added to spring

k = spring constant

x = displacement

The spring constant is typically in range of 4900 to 29400 N/m.

So if we take the extreme case of 29400 N/m and lets say we assume an unusually, extreme case of 1 m compression, we get the value of energy added to be:

ΔE = (0.5)(29400 N/m)(1 m)²

ΔE = 1.47 x 10⁴ J

Now, if we convert this energy to mass from Einstein's equation, we get:

ΔE = Δmc²

Δm = ΔE/c²

Δm = (1.47 x 10⁴ J)/(3 x 10⁸ m/s)²

<u>Δm =  4.9 x 10⁻¹³ kg</u>

As, you can see from the answer that even for the most extreme cases the value of mass associated with the additional energy is of very low magnitude.

Since, the scale only gives the mass value upto 1 decimal place.

Thus, it can not determine such a small change. So, the correct option is:

<u>d. The scale's resolution is too low to read the change in mass</u>

You might be interested in
Use absolute dating in a sentence
Scrat [10]

Answer:

scientists will use absolute dating to find how old a fossil exactly is.

4 0
2 years ago
Read 2 more answers
The two forces in each pair can either both act on the same body or they can act on different bodies. The two forces in each pai
Marrrta [24]

Answer:

The correct answer in which peer forces each act in a different body

Explanation:

Newton's law of action and reaction states that the two forces have equal magnitude, but in the opposite direction, each acting on a body. Which creates acceleration in these, if they act in the same body it would be canceled so there would be no movement.

The correct answer in which peer forces each act in a different body

6 0
3 years ago
According to the second law of thermodynamics, it is impossible for ____________. According to the second law of thermodynamics,
Tomtit [17]

Answer:

It's impossible for an ideal heat engine to have non-zero power.

Explanation:

Option A is incomplete and so it's possible.

Option B is possible

Option D is related to the first lae and has nothing to do with the second law.

Hence, the correct option is C.

The ideal engine follows a reversible cycle albeit an infinitely slow one. If the work is being done at this infinitely slow rate, the power of such an engine is zero.

We can also stat the second law of thermodynamics in this manner;

It is impossible to construct a cyclical heat engine whose sole effect is the continuous transfer of heat energy from a colder object to a hotter one.

This statement is known as second form or Clausius statement of the second law.

Thus, it is possible to construct a machine in which a heat flow from a colder to a hotter object is accompanied by another process, such as work input.

7 0
3 years ago
The top speed you will ever need to go in a parking lot is_
Kruka [31]

10 mph i jus got it right on the test

3 0
3 years ago
An object hangs from a spring in a stable (equilibrium) position. The spring is pulled 3 feet downward and the object begins to
mote1985 [20]

The equation of the motion of this object is  \mathbf{y = 3 cos \Big [ \dfrac{ \pi}{2}(t -2) \Big ] }

<h3>What is oscillation?</h3>

An oscillation in a waveform is a periodic set of vibrations an object in the medium produces.

From  the parameters given:

  • The spring is pulled 3 feet down ward from the origin(equilibrium position) = -3
  • Time to complete one oscillation = 4 seconds

The angular velocity can be computed by using the formula:

\mathbf{\omega = \dfrac{2 \pi}{T}}

\mathbf{\omega = \dfrac{2 \pi}{4.0}}

The amplitude A from the oscillation is:

\mathbf{\Big|A \Big| = \Big|\dfrac{3 - (-3)}{2} \Big| = 3}

It implies that the vertical shift (D) is:

\mathbf{\dfrac{minimum + maximum}{2} = \dfrac{3+(-3)}{2} = 0}

However, by using the formula of the general form of a sinusoidal equation, we have:

\mathbf{y = A cos \Big [ \dfrac{2 \pi}{4}(t -2) \Big ] + 0}

\mathbf{y = 3 cos \Big [ \dfrac{ \pi}{2}(t -2) \Big ] }

Learn more about oscillation in waveform here:

brainly.com/question/15701473

5 0
2 years ago
Other questions:
  • A rock is dropped from rest and falls 50 m determine the velocity upon hitting the groung?
    15·1 answer
  • What is the role of the sun in the formation of clouds??
    13·1 answer
  • A step up transformer used in an automobile has a potential difference across the primary of 1800 V and a potential difference a
    9·1 answer
  • The current produced in homes is ______ current.
    11·2 answers
  • As a bat flies toward a wall at a speed of 6.0 m/s, the bat emits an ultrasonic sound wave with frequency 30.0 kHz. What frequen
    13·1 answer
  • 1. Determina el momento que produce una fuerza de 7 N tangente a una rueda de un metro de diámetro, sabiendo que el punto de apl
    5·1 answer
  • What are some good biotechnology topics?
    14·1 answer
  • What is the magnitude of the electric field at a point midway between a −5.0μC and a +5.8μC charge 8.4cm apart? Assume no other
    5·1 answer
  • Sunitha can type 1800 words in half an hour. What is her typing speed in words per minute?
    10·1 answer
  • To understand the behavior of the electric field at the surface of a conductor, and its relationship to surface charge on the co
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!