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
(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.
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
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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