D: the number of protons determines the atomic number of an atom
Given:
A train travelled 2 hrs along a windy truck from Tema to Tano in 108 km. What is the average speed of the train.
54 km per hours
Explanation:
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<h3><u>Answer;</u></h3>
<em>85 joules </em>
<h3><u>Explanation;</u></h3>
- <u><em>From conservation of energy, the kinetic energy at take off equals the potential energy at the top of the jump.</em></u>
- Potential energy = kinetic energy
- <em><u>Potential energy = mgh </u></em>, where m is the mass, h is the vertical height and g is the gravitational acceleration.
Therefore; energy = 7.2 × 9.8 × 1.2
= 84.672 Joules
= 85 joules
Thus, the kinetic energy is <u>85 joules.</u>
Answer:
The first frequency is 671 Hz.
Explanation:
Given that,
Frequency = 660 Hz
Distance from one speaker = 0.20 m
Distance between two speakers = 4.5 m
Speed of sound = 344 m/s
We need to calculate the path difference
Path difference = 4.3-0.20 =4.1 m
We need to calculate the frequency
Using formula of path difference
Here, n = 8
Because, the frequency is less then 660 Hz at n = 7.
Hence, The first frequency is 671Hz.
Answer:
Power, P = 22 W
Explanation:
It is given that,
Force acting on the object,
Velocity of the object,
To Find,
The rate at which the force does work on the object
Solve,
The rate at which the force does work on the object is called its power. Its formula is given by :
So, the force work on the object at the rate of 22 watts