<u>Answer:</u>
Resultant displacement is 4 km north.
<u>Explanation:</u>
Let east represents positive x- axis and north represent positive y - axis. Horizontal component is i and vertical component is j.
A runner traveled 15 kilometers north then backtracked 11 kilometers south before stopping,
So initial displacement, 15 kilometers north = 15 j km
Second displacement, 11 kilometers south = -11 j km
Total displacement = 15 j -11 j = 4 j km
Total displacement is 4 km north.
M=3kg
p=33kg.m/s
p=m*v
v=p/m
=33/3
=11m/s
thus option (c)
Answer:
28.3 kg
Explanation:
Assuming the ground is level, the normal force equals the weight.
N = mg
277 N = m × 9.8 m/s²
m = 28.3 kg
The Law of Reflection held for planar waves due to partial transmission of the wave.
<h3>What is a Planar wave?</h3>
This is a wave which has a constant physical quantity which is perpendicular to the direction of wave travel.
These type of wave has normal wave characteristics such as frequency and is partially transmitted through reflection.
Read more about Planar wave here brainly.com/question/13962949
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Answer:
gravitational force
Explanation:
We have four types of fundamental forces in nature
1) Electromagnetic force: It is of either repulsive or attractive type of force and this depends on distance between charges and polarity of charge.
2) Strong and weak nuclear force: this is also of attractive or repulsive type of force and it only depends on distance between two nuclei.
3) Gravitational force: It depends on the mass of the objects and it is only attraction type of force.
so here all matter in universe attract each other only due to gravitational force because all other forces are of both type i.e. attraction and repulsion both.
so correct answer will be
gravitational force
