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PHY121
–
Midterm I
version
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1.
Which of the following is NOT a vector?
2.
I need to calculate the uncertainty Δ
D
in distance travelled using the equation
D=v
t
from the measured
uncertainties in
v
and
t
: Δ
v
and Δ
t
. Which formula should I use?
3.
Which of the following ideas is true about general projectile motion with no air drag?
4.
Two bullets are fired simultaneously in the horizontal direction and with the same height above a horizontal
plane. The bullets have different masses and different initial velocities. Which one will strike the plane first?
5.
A projectile is fired from the origin as shown in the figure. The initial
velocity components are
v
0
x
= 940 m/s and
v
0
y
= 96 m/s. The projectile
reaches maximum height at point P, then it descends and strikes the
ground. The
height
of point P is closest to:
6.
A child pulls on a wagon handle at an angle 37° above the horizontal with a force of 45 N. If the wagon
accelerates at 8.1 m/s
2
horizontally, the mass of the wagon is closest to (ignore frictional forces):
7.
The engine of a 1250 kg car exerts a backwards directed force of 3651 N on the road, which returns a
forwards directed reaction force on the car. If the car accelerates at 2.60 m/s
2
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This note was uploaded on 02/20/2012 for the course PHY 121 taught by Professor Stephens during the Spring '08 term at SUNY Stony Brook.
 Spring '08
 STEPHENS
 Physics

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