Answer:
Metals conduct heat and reduce the kinetic energy within the components that need to remain cool
Answer:
Explanation:
<u>Net Force</u>
There are four forces acting on the sled:
Its weight W directed down
The normal force N directed up
The applied force F directed left
The friction force, opposite to the motion, directed right.
The forces are shown in the free-body diagram of the figure below.
The body is in equilibrium in the vertical direction, thus:
N = W = m.g
N = 80 Kg . 9.8
N = 784 Nw
In the horizontal direction, the sum of the force vectors is the net force:
Fn = F-Fr
It's assumed the left as positive.
The friction force is calculated as:
Fr =0.125*784 Nw
Fr = 98 Nw
According to Newton's second law, the net force is equal to the mass by the acceleration:
F-Fr=m.a
The acceleration can be calculated by solving for a:
Answer:
176ft/s
Explanation:
Speed of a wave is a function of the frequency and wavelength of the wave. It is expressed mathematically as:
V = fλ where:
V is the speed of the wave
f is the frequency
λ is the wavelength
Given f = 16Hz, λ = 11ft
V = 16×11
V = 176ft/s
A) 222 N/m
Explanation:
Hook's law gives us the relationship between force (F), displacement with respect to the original length (x) and spring's constant (k):
In this part of the problem, we have:
F = 120 N - 100 N = 20 N is the new force applied
x = 9.0 cm = 0.09 m is the displacement relative to the initial stretched position
Solving the equation for k, we find the spring constant
B) 45 cm
We can use Hook's law also for this part of the exercise:
where this time we have
F = 100 N (the original pull applied)
k = 222 N/m
Solving the equation for x, we find the original displacement:
Answer:
Explanation:
a )
one rotation per 24 hours
Time period of rotation of the earth T = time / no of rotation
T = 24 x 60 x 60 s / 1
= 86400 s .
b )
angular velocity = angle of rotation in radian / time
in one rotation , angle made at the centre = 2π radian
= 2 x 3.14 radian
angular velocity ω = 2π / T
= 2 x 3.14 / 86400 radian / s
= 72.68 x 10⁻⁶ radian / s
c )
Relation between linear and angular velocity is as follows
v = ω x R where R is radius of the earth and v is linear velocity .
linear velocity = 72.68 x 10⁻⁶ x 6.4 x 10⁶ m /s
= 465.152 m /s
=