Answer:
Force, F = 77 N
Explanation:
A child in a wagon seem to fall backward when you give the wagon a sharp pull forward. It is due to Newton's third law of motion. The forward pull on wagon is called action force and the backward force is called reaction force. These two forces are equal in magnitude but they acts in opposite direction.
We need to calculate the force is needed to accelerate a sled. It can be calculated using the formula as :
F = m × a
Where
m = mass = 55 kg
a = acceleration = 1.4 m/s²
F = 77 N
So, the force needed to accelerate a sled is 77 N. Hence, this is the required solution.
Answer:
Erosion is the wearing away if land by forces such as water and wind. It has created things such as mountain peaks, valleys and coastlines.
Answer:
After 3 hours.
Explanation:
This is a encounter problem.
We start by writing the position equation of both objects.
We assume that acceleration is equal to zero in both boats ⇒ They move with constant speed
We put the origin of coordinates in the harbour so after 6 hours the first boat travels
The first boat will be 42 mi far from the harbour.
The position equation for a motion with acceleration equal to zero is :
Where is initial position
v is the speed
t is time and is initial time
Then is time variation
For the first boat :
Because we set
For the second one :
In the encounter : x1(t) = x2(t) ⇒
So after 3 hours they have the same position relative to the harbour
We can check by replacing the value t = 3h in both position equations
For x1(t) :
For x2(t) :
Answer:
Kinematics is the branch of classical mechanics that describes the motion of points, objects and systems of groups of objects, without reference to the causes of motion (i.e., forces ). The study of kinematics is often referred to as the “geometry of motion.”
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Ans: The electron is moving at
0.732% relative to speed of light.
Explanation:According to the <span>de Broglie relationship:
</span>
<span>
So,
</span>
<span>h = Planck's constant = 6.626 * 10^-34 Js
</span><span>m = mass of electron = 9.11 * 10^-31 kg
</span>λ = wavelength = 3.31 * 10^-10 m
<span>
</span>
m/s
<span>
Since the electron is moving relative to the speed of light, therefore the ratio is(in %):
</span>
% =
% =
0.732%<span>
</span>