The mass of helium atoms are higher than predicted given the number of protons. Helium atoms have an actual mass of about 4 amu. In fact, most atoms seem to be too heavy. Lithium is known to have 3 protons, but a mass of 7 amu, carbon atoms have 6 protons and a mass of 12 amu.

Rutherford proposed the idea that there could also be another particle in the nucleus with the protons. He thought these particles would be neutral and named them neutrons.

How does the idea of a neutron help address the puzzles about the protons in the nucleus and the mass of atoms?

Answer:

Acceleration, a = -0.5 m/s²

Explanation:

Given the following data;

Initial velocity = 72 km/h

Final velocity = 18 km/h

Time = 10 seconds

To find the acceleration of the car;

Conversion:

72 km/h to m/s = 72*1000/3600 = 20m/s

18 km/h to m/s = 18*1000/3600 = 5 m/s

In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.

This simply means that, acceleration is given by the subtraction of initial velocity from the final velocity all over time.

Hence, if we subtract the initial velocity from the final velocity and divide that by the time, we can calculate an object’s acceleration.

Mathematically, acceleration is given by the equation;

[tex]Acceleration (a) = \frac{final \; velocity - initial \; velocity}{time}[/tex]

Substituting into the equation;

[tex]a = \frac{5 - 20}{10}[/tex]

[tex]a = \frac{-5}{10}[/tex]

Acceleration, a = -0.5 m/s²

Therefore, the car is decelerating.

Answer:

a) [tex]d= 0.0002cm[/tex]

b) [tex]m=3[/tex]

Explanation:

From the question we are told that:

Width of diffraction grating [tex]W_g= 5cm[/tex]

Width of silt [tex]w_s 0.0001 cm[/tex]

Distance [tex]d= 0.0002cm[/tex]

a)

Generally the grafting element is the distance b/w  the silts

[tex]d= 0.0002cm[/tex]

Therefore the grafting element is

[tex]d= 0.0002cm[/tex]

b)

Generally the equation for diffraction state is mathematically given by

 [tex]dsin\theta=m\lambda[/tex]

Since

 [tex]sin\theta \leq 1[/tex]

Therefore

 [tex]m \leq \frac{d}{\lambda}[/tex]

 [tex]m \leq \frac{0.0002}{0.000055}[/tex]

 [tex]m \leq 3.6[/tex]

Therefore orders observed with [tex]\lambda[/tex] is

 [tex]m=3[/tex]

Answer:

the color is red.

Answer:

Thus, the angle of reflection is 15 degrees.

Explanation:

Angle of incidence, i = 15 degrees

The angle of incidence is the angle between the normal to the mirror and the incident ray, the angle of reflection is the angle between the reflected ray and the normal to the mirror.

According to the laws of reflection, the angle of incidence is equal to the angle of reflection.

Thus, the angle of reflection = angle of incidence = 15 degrees

Answer:The true statements about generators would be :

They convert motion energy to electric energy

           They use the relative motion of a magnet and a coil of wire.

Explanation:

Generators use the energy of the rotating coil in relative motion with magnets to induce a current within the wire. Generators are devices that convert energy into a voltage by the relative motion of the magnet and a coil that changes flux.

Answer:

It's nitrogen. Specifically, this is the alpha emission of an N-15 isotope.

Answer:

d

Explanation:

atoms exits everywhere

Answer: The correct choices to this question are, "B. Atoms are smaller than quarks," and "D. Atoms only exist on earth." Hope this helped.

Answer:

Explanation:

Eustachian tube is located in between the middle ear and the nasopharynx.It's function is to control the pressure within the middle making it equal to the air pressure outside the body.

m = 43.2 kg

Explanation:

volume of sphere = (4/3)pi(r)^3

= (4/3)(3.14)(2 m)^3

= 33.5 m^3

density = mass/volume

or solving for mass m,

m = (density)×(volume)

= (1.29 kg/m^3)(33.5 m^3)

= 43.2 kg

The weight of air inside this spherical balloon is equal to 423.75 Newton.

Given the following data:

To determine the weight of air inside this spherical balloon:

First of all, we would calculate the volume of this spherical balloon by using this formula:

[tex]Volume = \frac{4}{3} \pi r^3\\\\Volume = \frac{4}{3} \times 3.142 \times 2^3\\\\Volume = \frac{32 \times 3.142}{3}[/tex]

Volume = 33.52 cubic meters.

Next, we would calculate the mass of air contained in this spherical balloon:

[tex]Mass = density \times volume\\\\Mass = 1.29 \times 33.52[/tex]

Mass = 43.24 kg

For the weight of air:

[tex]Weight = mg\\\\Weight = 43.24 \times 9.8[/tex]

Weight = 423.75 Newton

Read more on weight here: https://brainly.com/question/366299

Answer:

D. Dylan is incorrect because a 90-degree launch angle results in the largest vertical range​

Explanation:

Projectile is the motion of an object thrown into space. When an object is thrown into space, the only force which acts on it is the acceleration due to gravity.

An object thrown into space would reach maximum height (vertical range) if it is launched at an angle of 90 degrees. For maximum horizontal range, the object needs to be launched at an angle of 45 degrees.

Therefore Dylan is incorrect because a 90-degree launch angle results in the largest vertical range​

The correct statement is

D. Dylan is incorrect because a 90-degree launch angle results in the largest vertical range​

It is the object motion that should be thrown into space. At the time when the object is thrown into space, the only force that should act on it represent the acceleration because of gravity.

Since object thrown into space should have to reach maximum height in the case when it is launched the 90 degrees angle. Due to the above reasons, option D is considered.

Learn more about the degree here: https://brainly.com/question/2836651

Answer:

no

Explanation:

Answer: 2.0

Explanation: I KNOW !

Answer:

law

Explanation:

A law is a scientific statement that describes a proven fact about how things function in nature

Answer:

I dont know hehe

Explanation:

Sakit na ulo ko.

put it in good terms okay

Answer:

good terms hope helpful answer to your question

Answer:

The Answer is

A) move a magnet into the centre of the coil of wire

Answer:

my only true question is b

Answer:

a. Volts = current x resistance

Explanation:

Ohm's law states that at constant temperature, the current flowing in an electrical circuit is directly proportional to the voltage applied across the two points and inversely proportional to the resistance in the electrical circuit.

Mathematically, Ohm's law is given by the formula;

[tex] V = IR[/tex]

Where;

V represents voltage measured in voltage.

I represents current measured in amperes.

R represents resistance measured in ohms.

Hence, Ohm's law gives the relationship between voltage, current and resistance of an electric circuit.

Answer:

40°Fahrenheit= 4.44°Celsius

Answer:

what a fat bear I love physics

Answer:

Explanation:

This is true because the definition of work is the parallel force required to move an object times the distance it moves. If it doesn't move, no work has been done. That is not to say that no energy has been expended, because it most certainly has! But that is not the same thing.

Answer:

[tex]\theta_i = 23^o[/tex]

Explanation:

The refractive index of a medium is given by the following formula:

[tex]\eta = \frac{Sin\theta_i}{Sin\theta_r}[/tex]

where,

η = refractive index = 1.5

[tex]\theta_i[/tex] = angle of incidence = ?

[tex]\theta_r[/tex] = angle of refraction = 15°

Therefore,

[tex]1.5 = \frac{Sin\theta_i}{Sin15^o}\\\\Sin\theta_i=(1.5)Sin15^o\\\\\theta_i = Sin^{-1}(0.388)\\\\[/tex]

[tex]\theta_i = 23^o[/tex]

Answer:

the velocity is 0.45 m/s and it is moving in the opposite direction

or

-0.45 m/s

Explanation:

The law of conservation of momentum says that  initial momentum = final momentum

( mass x velocity of the dog ) = - (mass x velocity of the canoe)

(15 x 1.2) =- (40 x velocity of the canoe)

Velocity of the canoe = -(15 x 1.2) / 40 = -0.45 m/s

Answer:

force

Explanation:

Force is a push or a pull of an object that causes the object to speed up, slow down, or stay in one place. In other words, a force is what causes an object to move. Friction and gravity are two types of forces that influence how an object moves.

Answer: [tex](a)10.812\ m/s\ (b)\ 0.75\ m/s\ \text{left}[/tex]

Explanation:

Given

Mass of hockey puck [tex]m=0.160\ kg[/tex]

Initial velocity of hockey puck is [tex]u=3\ m/s[/tex]

First a horizontal force of [tex]25\ N[/tex] is applied to the right for [tex]0.05\ s[/tex]

acceleration associated with it is

[tex]\Rightarrow a=\dfrac{25}{0.160}\\\\\Rightarrow a=156.5\ m/s^2[/tex]

Using equation of motion i.e.

[tex]\Rightarrow v=u+at\\\Rightarrow v=3+156.25\times 0.05\\\Rightarrow v=3+7.812\\\Rightarrow v=10.812\ m/s[/tex]

(b) When a force of [tex]12\ N[/tex] is applied for 0.05s

Using equation of motion i.e.

[tex]\Rightarrow v=3-\dfrac{12}{0.160}\times 0.05\\\\\Rightarrow v=3-75\times 0.05\\\Rightarrow v=3-3.75\\\Rightarrow v=-0.75\ m/s\\\Rightarrow v=0.75\ \text{towards left}[/tex]

Answer:

Her final velocity at she moves over the the bottom of the ramp is approximately 1.20204 m/s

Explanation:

The data of the energy used by the person in the wheel chair are;

The work done by the person, W = 70.8 J

The initial position of the wheel chair = At the bottom of the ramp

The time the person takes to do the work, t = 1.00 s

The number of turns she turned the wheel chair = 1/4 turns

The radius of the wheel of the wheel chair, r = 40 cm

The mass of her and the wheel chair, m = 98.0 kg

By the conservation of energy principle, we have;

The total mechanical energy of the motion, M.E. = The amount of work done by her in moving up the ramp = 70.8 J

M.E. = P.E. + K.E. = Constant

Where;

P.E. = Potential energy

K.E. = Kinetic energy

At the height she reached the ramp, M.E. = P.E. = 70.8 J

At the bottom of the ramp, P.E. = 0 J, therefore;

K.E. = 70.8 J

We have;

K.E. = (1/2)·m·v²

Where;

m = The mass of her and the wheelchair = 98.0 Kg

v = Her final velocity at the bottom of the ramp

By substitution, we have;

70.8 J =  (1/2) × 98.0 Kg × v²

v² = 70.8/((1/2) × 98.0) = 354/245

v = √(1,770)/35 ≈ 1.20204

Her final velocity as she passed back over the bottom of the ramp, v ≈ 1.20204 m/s.

Answer:

43.4 N (newton)

Answer:

B. It decreases proportionally to the wavelength

Explanation:

The relationship between wavelength, velocity, and frequency of a wave is given as;

[tex]f = \frac{v}{\lambda}[/tex]

where;

f is the frequency of the wave

v is the velocity of the wave

λ is the wavelength

From the equation above, the frequency of a wave is inversely proportional to its wavelength. As the wavelength increases, the frequency decreases and vice versa.

Therefore, the correct option is "B"

B. It decreases proportionally to the wavelength