Answer:
a) 104.94 N, b) F = 51.48 N
, c) a = 2.65 m / s²
Explanation:
We apply Newton's second law to solve the problem, in the attached you can see a free body diagram
X axis
F - fr = ma
fr = μ N
F = μ mg + m a
F = m (μ g + a)
Axis y
N- W = 0
N = w = mg
a) The force just before starting the movement, in this case the friction force is static, in this case the acceleration is zero
F = fr
F = μ mg
F = 0.530 198
F = 104.94 N
b) When the box is already moving the friction force changes the dynamic friction force and if the box moves with constant speed the acceleration is zero
F = fr
F = 0.260 198
F = 51.48 N
c) In this case F is 104.95 N, but the friction force is 51.48 N
W = mg
m = W / g
m = 198 /9.8
m = 20.2 kg
F-fr = ma
a = (104.98 - 51.48) /20.2
a = 2.65 m / s²
It takes approximately 27 days
The remote control, and wireless transmissions
Answer:
The horizontal speed with which the slingshot hits the balloon is approximately 57.358 m/s
Explanation:
The given parameters of the slingshot motion are;
The initial velocity of the slingshot, v = 100 m/s
The angle (to the horizontal) at which the slingshot is fired makes, θ = 55°
The path of the slingshot which hits the stationary balloon at the top of its flight = Parabolic trajectory
The horizontal component of the velocity = vₓ = v·cos(θ) = Constant
vₓ = 100 × cos(55°) ≈ 57.358
The horizontal speed with which the slingshot hits the balloon = vₓ ≈ 57.358 m/s.
I have worked in both situations, and I understand each
of their preferences.
I hope both Kevin and Marsha are successful at their jobs,
and may they live long and prosper.
Thank you for sharing their heartwarming stories.
