Answer:
m = 1.31 kg
Explanation:
Given that,
The speed of duck, v = 9.1 m/s
The magnitude of momentum, p = 12 kg-m/s
We need to find the mass of the duck. We know that the momentum of an object is given by :
p = mv
Where
m is the mass of the duck
So, the mass of the duck is equal to 1.31 kg.
Answer: Option (b) is the correct answer.
Explanation:
A branch of science that consists of study of matter and its motion through space and time is known or referred as Physics.
It is also related to concepts like energy and force etc.
Thus, we can conclude that out of the given options, a branch of science involves the study of matter and energy is physics.
Answer:
Gold is more dense.
Gold sinks faster than lead. That's why gold is found in the bottom of a gold pan or river.
Answer:
False
Explanation:
As we know that, the Balmer series gives the n values as,
.
.
Now the value of wavelength can be calculated as,
.
Here, .
And .
Now,
.
Therefore,
Therefore, the wavelength of Balmer series lies in visible region which is 547 nm.