Physics 111 Fall 98 Exam 1
October 2, 98 Version A
(version B = version A with scrambled questions.
1) 100 mm are equivalent to how many yards?
2) 6.0 kilometers squared are equivalent to how
many squared centimeters?
3) Determine the resultant vector C obtained by
adding together the two vectors A and B:
A = 1i + 4j + 7k B = -4i
+ 8j - 1k
4) A vector 10 units long makes an angle of 2600
with the +x axis of a Cartesian coordinate system. Find the x and
y components of the vector.
5) A man walks east 3 km and then he walks 4 km
at 600 north of east. The resultant displacement in km
from where he started is closest to:
6) A racing car traveling with constant acceleration
increases its speed from 10 m/s to 30 m/s over a distance of 80 m
How long does this take?
7) a car starts from rest and accelerates uniformly
from 0 to 80 km/hr in 5 sec. Find the average acceleration and the
distance moved during the 5 second period.
8) A 500 gm mass is whirled around at the end of
a rope so that it moves in a circle. The mass makes 24 RPM (revolutions
per minute) and the circle has diameter of 3 meters. Determine the
magnitude of the radial acceleration of the mass in m/s.
9) A ball is thrown vertically; upward from
a height of 5 feet above the ground d with an initial velocity of 20 ft/sec.
Find the velocity of the ball as it impacts the ground (note a positive
velocity is directed upward):
10) A car goes through an intersection at 40 mph.
A second car starts from rest at eh intersection (as the first car goes
through the intersection ) and accelerates at 10 ft/sec2.
How long does it take for the second car to overtake the first?
A ball is thrown from the origin at time
t = 0 with an initial velocity of v0 = 22i + 31 j (in SI units).
11) The magnitude of the initial velocity, in SI
units, is closest to:
12) The angle the initial velocity makes with the
x - axis, is closest to:
13) The value of y, when the time t = 2.5 seconds,
in SI units, is closest to:
14) The y component of the velocity of the ball,
when the time t = 5 seconds, in SI units, is closest to;
15) The average velocity of the ball in the x direction,
between the times 0 seconds and 2.5 seconds, in SI units, is closest to:
The following statement applies to problems 16 - 20
Particle A of mass 6-kg and particle B of mass 4-kg are
both in uniform circular motion with different radii and speeds.
Particle a moves with a speed of 12 m/s in a circle of 6 m radius.
The period for particle B (i.e., the time for one revolution) is 1.57 seconds,
and its centripetal acceleration is 64 m/s2.
16) The acceleration of particle A in m/s2
is closest to
17) The period for particle A in seconds is closest
to
18) The radius of the circle traveled by; B, in
SI units, is closest to
19) The speed of particle B in SI units is closest
to
20 The centripetal force acting on B in SI units
is closest to
