Download 1) A car starts to accelerate from rest with a=0

1) A car starts to accelerate from rest with a=0.5 m/s2. What is its velocity after
100m?
a) 2.5 m/s
b) 5.0 m/s
c) 10 m/s
d) 20 m/s
e) unknown, because the mass of the car is not given
2) A canon is shot under an angle of 30.00 with respect to the ground with an initial
velocity of 49.0 m/s. At what horizontal distance away from the cannon does the
cannon ball reach its highest point?
a) 50 m
b) 106 m
c) 212 m
d) 245 m
e) none of the above
3) A mass of 7.0 kg lying on a slope (370 with respect to the ground) is connected via
a string over a massless pulley to a second mass m2 (see drawing). Assuming that
the slope is frictionless, what is the mass of m2 if the system remains stationary
(i.e. the masses do not start to move when released)?
a) 0.0 kg
b) 2.0 kg
c) 4.2 kg
d) 5.6 kg
e) 11.6 kg
m2
4) Two vectors, one of length 4m and one of length 2m are added together but it is
unknown what the relative angle between the two vectors is. What are the
minimum and maximum magnitude of the resultant vector?
a) 2m and 4m
b) 2m and 6m
c) 0.5m and 8m
d) 3.5m and 4.5 m
e) 0m and 6m
5) A block is launched up an incline plane. After going up, it slides back down to its
starting position. The coefficient of kinetic friction between the block and the
plane is 0.3. The speed of the block when it reaches the starting position on the
trip down:
a) the same as the launching speed
b) is less than the launching speed
c) is more than the launching speed
d) cannot be compared to the launching speed with the information given
e) could be the same or more than the launching speed
6) Robert and Paul pull a crate of 50 kg as indicated in the figure. Robert pulls with a
force of 80N and Paul with a force of 60N. What is the magnitude of the
acceleration of the crate if the coefficient of kinetic friction is 0.10?
a) 1.0 m/s2
Paul 60N
b) 1.8 m/s2
c) 2.0 m/s2
top
d) 2.8 m/s2
view
e) the crate doesn't accelerate at all
Robert 80N
Extra question for latter part of the material.
1) The motion of a mass on a spring oscillating in the horizontal direction is given to
be:
X(t)=0.2cos(t/2)
The velocity and acceleration of the mass are then described by:
a. V(t)=0.2sin(t/2) and a(t)= -0.22cos(t/2)
b. V(t)=0.1sin(t/2) and a(t)= -0.052cos(t/2)
c. V(t)=0.1cos(t/2) and a(t)= 0.12sin(t/2)
d. V(t)=-0.1sin(t/2) and a(t)= 0
e. V(t)=0.05sin(t/2) and a(t)= -0.22cos(t/2)