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3 years ago

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Frank says that quantum mechanics does not apply to baseballs because they do not jump from quantum state to quantum state when

being thrown. Francine agrees with him. She says that there is no uncertainty in a baseball's position or momentum. Are they correct, or not, and why

1 answer:

Minchanka [31]3 years ago

6 0

Answer:

They are correct

Explanation:

According to the uncertainty principle, the uncertainty in the position of an object is directly proportional to its De Broglie wavelength.

The De Broglie wavelength of a baseball is about $10^{-34}m$ , recall that the diameter of the atom is about to $10^{-10}m$ . Thus, the error in simultaneously determining the position and momentum of a baseball is infinitesimally small.

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Consider two antennas separated by 9.00 m that radiate in phase at 120 MHz, as described in Exercise 35.3. A receiver placed 150

Dafna11 [192]

Answer:

a

$\Phi =4.524 \ rad$

b

$I = 0.40637 I_o$

Explanation:

From the question we are told that

The distance of separation is $d = 9.0 \ m$

The frequency is $f = 120 \ MHz = 120 *10^{6} \ Hz$

The distance of the receiver from the antennas is $D = 150 \ m$

The intensity measured is $I = I_o$

The change in position of the receiver is by $\Delta D = 1.8 \ m$

Gnerally the phase difference is mathematically represented as

$\Phi = \frac{ 2 \pi * \Delta D}{\lambda}$

Here $\lambda$ is the wavelength which is mathematically represented as

$\lambda = \frac{c}{f}$

Here c is the speed of light with value $c = 3.0 *10^{8} \ m/s$

=> $\lambda = \frac{3.0 *10^{8}}{ 120 *10^{6} }$

=> $\lambda = \frac{3.0 *10^{8}}{ 120 *10^{6} }$

=> $\lambda = 2.5 \ m$

So

$\Phi = \frac{ 2* 3.142 * 1.8 }{2.5}$

$\Phi = \frac{ 2* 3.142 * 1.8 }{2.5}$

$\Phi =4.524 \ rad$

Generally the intensity measured by the receiver is

$I = I_o cos^2 [\frac{\Phi}{2} ]$

=> $I = I_o [cos [\frac{4.524}{2} ]]^2$

=> $I = I_o [cos [ 2.262]]^2$

=> $I = 0.40637 I_o$

6 0

3 years ago

What is the relationship between force and acceleration?

lukranit [14]

<u>Answer</u>:

Force is directly proportional to the acceleration.

<u>Explanation</u>:

Using to the Newton's second law of motion, we can describe the relationship of force and acceleration.

F = ma

Hence they are directly proportional to each other. If we increase the force in an object then the acceleration of the object will also increase by same. or we can say force is similar to acceleration. Newton's second law says that the acceleration of an object depends on two factor i.e. net force that is acting on object and object's mass.

5 0

3 years ago

Could cellular respiration happen without photosynthesis

photoshop1234 [79]

No it can not because photosynthesis makes glucose and cellular respiration breaks down the glucose in to Carbon Dioxide and H2O (water).
Hope this helps!

8 0

3 years ago

Read 2 more answers

A 0.250 kgkg toy is undergoing SHM on the end of a horizontal spring with force constant 300 N/mN/m. When the toy is 0.0120 mm f

konstantin123 [22]

Answer:

(a) The total energy of the object at any point in its motion is 0.0416 J

(b) The amplitude of the motion is 0.0167 m

(c) The maximum speed attained by the object during its motion is 0.577 m/s

Explanation:

Given;

mass of the toy, m = 0.25 kg

force constant of the spring, k = 300 N/m

displacement of the toy, x = 0.012 m

speed of the toy, v = 0.4 m/s

(a) The total energy of the object at any point in its motion

E = ¹/₂mv² + ¹/₂kx²

E = ¹/₂ (0.25)(0.4)² + ¹/₂ (300)(0.012)²

E = 0.0416 J

(b) the amplitude of the motion

E = ¹/₂KA²

$A = \sqrt{\frac{2E}{K} } \\\\A = \sqrt{\frac{2*0.0416}{300} } \\\\A = 0.0167 \ m$

(c) the maximum speed attained by the object during its motion

$E = \frac{1}{2} mv_{max}^2\\\\v_{max} = \sqrt{\frac{2E}{m} } \\\\v_{max} = \sqrt{\frac{2*0.0416}{0.25} } \\\\v_{max} = 0.577 \ m/s$

8 0

4 years ago

Marine science- question- what is climate change?

Troyanec [42]

Answer:

Defined below

Explanation:

Climate change is simply the long term change in the average weather patterns that are associated with the local, regional and global climates of the earth. Climate change is usually driven by human activities like burning of fossils; natural processes like cyclic ocean patterns; external factors like volcanic eruptions.

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3 years ago