Answer:
400 N
Explanation:
Due to action-Reaction, the wall pushes back on the person with a force of equal magnitude and in opposite direction to the force exerted by the person.
So the magnitude must be also 400 N.
Answer:
Explanation:
r(t) = A(cos wt i + sin wt f)
= A cos wt i + A sin wt j
x = A cos wt
y = A sin wt
radius r
r² = x² + y² ( This is equation of a circle with radius r )
= A² cos² wt +A² sin² wt
= A²
r = A
radius r = A
b )
speed = dr/dt
v = - Aw sinwt i + Aw coswt j
magnitude of velocity
I v I= Aw √(sin²wt + cos²wt)
= Aw ( constant )
acceleration
= dv / dt = - Aw² cos wt - Aw² sinwt
magnitude of acceleration
I a I = Aw²
= r w²
d ) centripetal force = m acceleration
m w² A
=
Answer:
Explanation:
The resistance of a metal rod is given by
where
is the resistivity
L is the length of the rod
A is the cross-sectional area
The resistivity changes with the temperature as:
where in this case:
is the resistivity of silver at 
is the temperature coefficient for silver
is the current temperature
Substituting,
The length of the rod changes as
where:
is the initial length at 
is the coefficient of linear expansion
Substituting,
The cross-sectional area of the rod changes as
So, substituting,
Therefore, if the initial resistance at 21.0°C is
Then the resistance at 180.0°C is:
30N
Explanation:
Given parameters:
Mass of object = 15kg
Acceleration = 2m/s
Unknown:
Force = ?
Solution:
Force is given as the product of mass and acceleration:
F = m x a
m is the mass
a is the acceleration
Inputting the parameters:
F = 15 x 2 = 30N
The unit of force is newtons, N .
Learn more:
Force brainly.com/question/10470406
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