Unformatted text preview: PHYS 111
Midterm 1 Review A car starts at x=0 m and has the following velocity vs.
time graph. Draw the corresponding position vs. time
and acceleration vs. time graphs.
vx t A platform has a radius of 5 m and has
an angular displacement as a function
of time given by:
θ(t) = 5t − 8t
2 (a) Is the platform turning clockwise or
counterclockwise at t=0 s?
(b) How long does it take for the platform to
complete one revolution counterclockwise from
t=0?
(c) What is the total magnitude of acceleration for an
object on the edge of the platform at t=5 s? A plane has an airspeed (i.e., speed with respect to
the air) of vp = 100 m/s and is ﬂying at an angle of 30°
north of east. The wind is blowing at a velocity
w = (20ˆ − 30ˆ) m/s.
v
i
j We have deﬁned the +x axis as pointing east. If the
plane ﬂies over a navigation beacon at t=0 s, how far
is it from the beacon after 20 minutes? In what
direction? h = 10 m d = 15 m d = 15 m You are trying to throw a javelin over a house to impale
a zombie on the other side. If the house is 10 m tall at
the peak and you are 15 m from the peak, will your
throw clear the house? You throw a javelin with a speed
of v=20 m/s and the zombie is 15 m from the peak of
the house. A car is held up on an inclined, icy
(frictionless) ramp by a cable. The
ramp is inclined with respect to the
ground at an angle of 30.°. The car
has a mass of 1500 kg.
θ What is the tension in the cable? An elevator travels up 200 m. Safety regulations require
a maximum magnitude for its acceleration of 1 m/s2 and
a maximum velocity of 4.0 m/s. It starts and stops the
trip at rest.
How long does it take to make the trip up the full
200m? ...
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This note was uploaded on 01/24/2012 for the course PHYS 100 100 taught by Professor Eric during the Spring '11 term at UBC.
 Spring '11
 ERIC

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