Answer:
An atomic nucleus is positively charged because it is composed of protons.
Explanation:
Protons are positively charged
Neutrons are neutral
Electrons are negatively charged
Answer:
The speed of the two cars after coupling is 0.46 m/s.
Explanation:
It is given that,
Mass of car 1, m₁ = 15,000 kg
Mass of car 2, m₂ = 50,000 kg
Speed of car 1, u₁ = 2 m/s
Initial speed of car 2, u₂ = 0
Let V is the speed of the two cars after coupling. It is the case of inelastic collision. Applying the conservation of momentum as :
V = 0.46 m/s
So, the speed of the two cars after coupling is 0.46 m/s. Hence, this is the required solution.
Out of these, I have to say the answer is "Washing fruit"
Answer:
A) 0.
Explanation:
beats is the periodic variation in the loudness of a sound which is heard when two notes of almost the same frequency are played simultaneously.
Beats are used in tuning of musical instrument, e.g. a piano. To tune a piano, a piano tuner listens for beats produced between the sound from a standard tuning fork and that from a particular string on the piano when the piano key is struck. The tension in the piano string is adjusted until the beats disappear, i.e. when the frequencies are the same
Two tuning forks of frequency 256Hz and 254Hz are sounded simultaneously. Calculate the frequency of the resultant beat.
f == 2Hz
But in cases where beat is zero, it means the two notes are perfectly the same. This technique is used by a piano tuner to know that a key on the piano is tuned to the frequency of his tuning fork when he strikes them at the same time
NOTE : Hz means per second
Answer: The correct answer is "perpendicular".
Explanation:
In a transverse wave, the particles of the medium vibrates perpendicular to the direction of the motion of the wave.
For example, light wave.
It does not need medium to propagate. It can travel in vacuum. It travels with the speed of the light.
In a longitudinal wave, the particles of the medium vibrates parallel to the direction of the motion of the wave.
For example, sound wave.
Therefore, In a transverse wave, the motion of the disturbance is perpendicular to the wave motion.