Answer:
B = 1.029 N
Explanation:
Whenever an object is submerged into water, the water exerts a force on an object in the upward direction. When an object push water, water pushes it back with more force. Basically buoyant force is the weight of fluid displaced by the object submerged in water.
B = weight of object in air - weight of object in water
Converting gram into N
We know that 1 kg = 9.8 N
Changing kg into gram by multiplying both sides with 1x10¯³
1 g = 9.8x10¯³ N
430 g = 430x9.8x10¯³N
430 g = 4.214 N
325 g = 325x9. 8x10¯³ N
325 g = 3.185 N
Now, finding buoyant force
B = weight of object in air - weight of object in water
B = 4.214 - 3.185
B = 1.029 N
Answer:
a) F = -1.82 10⁻¹⁵ N, b) K = 9.1 10⁻¹⁶ J
Explanation:
a) To calculate the force between the nucleus and the electrons, let's use the Coulomb equation
F = k q Q / r²
as the nucleus occupies a very small volume compared to electrons, we can suppose it as punctual
let's calculate
F = 9 10⁹ (-1.6 10⁻¹⁹) (79 1.6 10⁻¹⁹) / (10⁻¹⁰)²
F = -1.82 10⁻¹⁵ N
b) they ask us for kinetic energy
let's use Newton's second law
F = m a
acceleration is centripetal
a = v² / r
we substitute
F = m v² / r
v = √ (F r / m)
v = √ (1.82 10⁻¹⁵ 10⁻¹⁰ / 9.1 10⁻³¹)
v = √ (0.2 10⁻¹⁶)
v = 0.447 10⁸ m / s
kinetic energy is
K = ½ m v²
K = ½ 9.1 10⁻³¹ (0.447 10⁸)²
K = 0.91 10⁻¹⁵ J
K = 9.1 10⁻¹⁶ J
Answer:
pitch is the quality of a sound governed by the rate of vibrations producing it; the degree of highness or lowness of a tone.
fundamental frequency. For D4 it is at 293 Hz roughly. For both the guitar and the piano, they are exactly the same!
the first couple of harmonics. they are at (293 x 2 =) 586 Hz and (293 x 3 =) 879 Hz. the harmonics are at the same frequencies for both the guitar and the piano show that both instruments are playing the same musical note.
the relative strengths of the first few harmonics. The guitar has a taller/stronger fourth harmonic and the piano has a taller/stronger second harmonic. this shows that although the musical note played in both cases is the same, they are being played by different musical instruments.
hope it helps!
