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astultz309459
24.11.2020 •
Advanced Placement (AP)
You just realized the turn signal on your vehicle is broken, and you need to signal that you're turning left. What is the correct way to do it?
A. Hold your left arm out of the window at a 90-degree angle, with your hand pointing upward to the sky.
B. Hold your left arm out of the window at a 90-degree angle with the hand pointed down.
C. Hold your left arm horizontally out the window.
D. Hold your left arm out the window pointing vertically straight up to the sky.
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Ответ:
Ответ:
Fⁿ = ma
Fnet = net force acting on the skier
m = mass of the skier = 53 kg
a = acceleration up the slope
Since velocity is constant then acceleration is zero, hence the above equation becomes
Fnet = 0
Fnet = F - Wx - f
where
F = force exerted by the tow bar
Wx = component of skier's weight parallel to the incline = 53(9.8)(sin 20)
f = frictional force = 0.160(53)(9.8)(cos 20)
Substituting appropriate values,
F - 53(9.8)(sin 20) - 0.160(53)(9.8)(cos 20) = 0
and solving for F,
F = 99.55 N
Hope this helps and have a nice day!