Answer:
The answer to your question is: F = 924 N
Explanation:
Data
v = 28 m/s
m = 66 kg
d = 56 cm
F = ?
Formula
v = d/t
a = v/t
F = ma
Process
t = d/v = 56 / 28 = 2 s
a = v/t = 28 / 2 = 14 m/s²
F = 66 (14) = 924 N
The wavelength of a sound wave is related to its frequency by the relationship:
where
f is the frequency
v is the speed of the wave
is the wavelength
The wave in our problem has wavelength of
and speed of
(this is the speed of sound in air), therefore its frequency is
And the period of the wave is equal to the reciprocal of its frequency:
Answer:
Smaller and upside down
Explanation:
To answer the question, we must recognise that the characteristics of the image formed by a convex lens depends on the position of the object from the lens.
From the diagram given in the question above, the following data were obtained:
1. The image is smaller than the object.
2. The image is inverted i.e upside down.
3. The image is closer to the lens
4. The image between 2f and f
Now, considering the options given in question above, the correct answer to the question is:
The image is smaller and upside down.
Answer: Choice 1
Law of Reflection
Theta(i)=Theta(r)
Angle of incidence=Angle of reflection
Answer:
Rutherford
Explanation:
In 1911, E. Rutherford and his collaborators bombarded a thin gold foil with alpha (positive) particles, coming from a radioactive material, at high speed. The experiment allowed observing the following behavior in the released particles: Most of them passed through the sheet without changing direction, as expected. Some deviated considerably e. A few particles bounced towards the emission source.
In the Rutherford Model the positive charge is concentrated in a central nucleus, so that the positive particles that pass very close to it, deviate enough from their initial trajectory and only those few that collide directly with the nucleus return in the direction of which they come from
.
The Rutherford Model states that: The atom has a central zone or nucleus where the total positive charge (that of the protons) and most of the mass of the atom, provided by the protons and neutrons. It also has an outer zone or cortex where electrons are found, which revolve around the nucleus. (Actually, the nucleus particles (protons and neutrons) were discovered after Rutherford established his model. Rutherford's experiment only reported a small, positive nucleus, did not clarify anything else)
.
