The plane's velocity with the tailwind is 260 m/s at 33°
`Equation for volume Correct Answers Volume = length x
width x height
a = Correct Answers = Δv / Δta
= (final velocity - initial velocity) / change in time
A 5.0 kg box accelerates down a 20° ramp with negligible
friction. What is the acceleration of the box? Correct Answers
W = mg = (5 kg)(9.8 N/kg) = 49 N
W┴ = (49 N)(cos 20) = 46 N
W// = (49 N)(sin 20) = 16.8 N
For this problem you only need to consider the forces parallel to
the ramp (the direction the box accelerates).
ΣF// = ma
W// = ma
(16.8 N) = (5.0 kg)(a)
, a = 3.36 m/s/s at -30° (along the surface of the ramp)
A box has a mass of 15 kg. What is the weight of the box?
Report the answer in both newtons and pounds. Correct
Answers W = mg
W = (15 kg)(9.8 N/kg)
W = 147 N
There are 4.4 N = 1lb
(147 N)(1 lb / 4.4 N) = 33.4 lb
A car moves forwards at a speed of 20 m/s for 5 seconds. What
is the distance the car has traveled? What is its displacement?
Correct Answers x = vt + xox - xo = (20 m/s)(5 s)Δx = 100 m
forwards
A car moving at a speed of 10 m/s slows to a stop over a
distance of 30 m. What was the acceleration of the car? Correct
Answers v2 = 2aΔx + vo2
0 = 2(a)(30 m) + (10 m/s)^2
a = -1.7 m/s2
A car moving at a speed of 20 m/s slows to a stop over 5
seconds. What is the acceleration of the car? Correct Answers
v = at + vo
0 = (a)(5 s) + (20 m/s)
a = -4 m/s/s
A car traveling at a speed of 20 m/s slows at a rate of 5 m/s/s for
2 seconds. How far did the car travel while stopping? Correct
Answers x = 1/2at2 + vot + xo
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