Answer:
a) the three longest wavelengths = 4.8m, 2.4m, 1.6m
b) what is the frequency of the third-longest wavelength = 75Hz
Explanation:
The steps and appropriate formula and substitution is as shown in the attached file.
Explanation:
3: the electricity is generated in the permanent magnet
Answer:
4.0 Kg
Explanation:
From the question given above, the following data were obtained:
Velocity (v) = 48 m/s
Kinetic energy (KE) = 4632 J
Mass (m) =?
Kinetic energy can be defined as the energy possess by a moving object. Mathematically, it is expressed as:
KE = ½mv²
Where
KE => kinetic energy
m => mass of object
v => velocity
With the above formula, we can obtain the mass of the object as follow:
Velocity (v) = 48 m/s
Kinetic energy (KE) = 4632 J
Mass (m) =?
KE = ½mv²
4632 = ½ × m × 48²
4632 = ½ × m × 2304
4632 = m × 1152
Divide both side by 1152
m = 4632 / 1152
m = 4.0 Kg
Therefore, the mass of the object is 4.0 Kg
Answer:
v = 42.92 m/s
Explanation:
Given,
initial speed of the ball, v = 11 m/s
time taken to hit the ground = 5.5 m/s
velocity of the ball just before it hit the ground, v = ?
time taken by the ball to reach the maximum height
using equation of motion
v = u + at
final velocity = 0 m/s
0 = 11 - 9.8 t
t = 1.12 s.
time taken by the ball to reach the water from the maximum height
t' - 5.5 -1.12 = 4.38 s
using equation of motion for the calculation of speed just before it hit the water.
v = u + a t
v = 0 + 9.8 x 4.38
v = 42.92 m/s
Velocity of the ball just before it reaches the water is equal to v = 42.92 m/s
