This exam consists of 25 questions; true-false questions are worth 2
points each, three-choice multiple choice questions are worth 3 points
each, five-choice multiple choice questions are worth 6 points each.
The maximum possible score is 111. When the exam was given, the minimum
"A" score was 99; the minimum "B" was 85; the minimum "C" was 72;
the minimum "D" was 55. The mean was 96.4; the median was 98. Click
here to see the formula sheet that came
with the exam.
A block of mass 6.0 kg resting on a horizontal frictionless surface
is attached to a spring with force constant k=210 N/m. A force of
F is applied to the block in the x-direction, thereby compressing
the spring from its equilibrium length by (see picture) by 0.1m.
What is the magnitude of force F?
(a) 8 N
(b) 10 N
(c) 17 N
(d) 13 N
(e) 21 N
(a) 3.3 sec
(b) 2.3 sec
(c) 1.1 sec
(d) 1.4 sec
(e) 9.3 sec
(a) It would be twice as large.
(b) It would be four times as large.
(c) It would not change.
(a) It will be larger.
(b) It will be smaller.
(c) It will not change.
An Archer pulls the bowstring back a distance of 0.2 m before
releasing the arrow. Consider that the bow and string act like a spring
with a spring constant of 230 N/m. The arrow has a mass of 0.03 kg.
What is the magnitude of the spring potential energy of the drawn
(a) 2.3 J
(b) 4.6 J
(c) 9.2 J
(d) 3.4 J
(e) 8.2 J
(a) 8.5 m/s
(b) 10.2 m/s
(c) 17.5 m/s
(d) 13.3 m/s
(e) 19.4 m/s
(a) L2 / L1 = sqrt(2)
(b) L2 / L1 = 2
(c) L2 / L1 = 4
(a) It rise.
(b) It stays the same.
(c) It falls.
(a) FB, LEAD = FB, IRON
(b) FB, LEAD > FB, IRON
(c) FB, LEAD < FB, IRON
A block of mass 10 kg and volume 1.25 x 10-3 m3
is suspended from a string and immersed in water (density = 1000
kg/m3) as shown in the figure.
How large is the buoyant force on the block?
(a) 4.07 N
(b) 9.26 N
(c) 12.3 N
(d) 47.8 N
(e) 98.1 N
(b) 98 + FB
(c) 98 - FB
The small piston of a hydraulic lift has a cross sectional area of 3
cm2 and the large piston has an area of 200 cm2.
What force F must be applied to the small piston to lift a load of
15,000 N on the large piston, assuming both pistons are at the same
height, as shown in the drawing?
(a) 150 N
(b) 225 N
(c) 550 N
(d) 1050 N
(e) 2.25 × 108 N
Water (density = 1000 kg/m3) squirts from a syringe at a
speed of 30 m/s. The diameter of the opening is 1 x 10-4 m.
What is the mass of the water that flows through the hole in one
(a) 2.4 × 10-4 kg
(b) 5.1 × 10-4 kg
(c) 7.2 × 10-4 kg
(d) 8.5 × 10-4 kg
(e) 10.2 × 10-4 kg
(a) 4.5 × 105 N/m2
(b) 5.3 × 105 N/m2
(c) 7.2 × 105 N/m2
(d) 8.4 × 105 N/m2
(e) 9.7 × 105 N/m2
A barometer is filled with an unknown liquid as shown in the drawing
below. The open bottom end of the barometer is exposed to air at
atmospheric pressure Pa=1.01 x 105
N/m2, and the pressure in the top closed end is 0. The liquid
in the closed end rises to a height h0=1.5 m above the open
end. What is the density of the liquid?
(a) 2510 kg/m3
(b) 3250 kg/m3
(c) 6870 kg/m3
(d) 7630 kg/m3
(e) 9340 kg/m3
(a) h1 = h0
(b) h1 = h0 / 2
(c) h1 = h0 / 4
(a) The ball wonít fit through the hole any more.
(b) The ball will fit more easily through the hole.
(c) Same as at room temperature.
Two metal rods, one made from aluminum and the other from steel, have
the same initial length (Lo = 5 m) at room temperature
(To = 20°C). At what temperature T1
would the aluminum rod be 2 mm longer than the steel rod (assuming that
both rods are at the same temperature).
(a) T1 = -22°C
(b) T1 = 0°C
(c) T1 = 4°C
(d) T1 = 56°C
(e) T1 = 88°C
(a) greater than 2 mm.
(b) less than 2 mm.
(c) equal to 2 mm.
(a) The bucket with the aluminum block.
(b) The bucket with the steel block.
(c) Both buckets of water will be at the same temperature.
A 50 g ice cube having an initial temperature of 0°C is put
into an insulated cup containing a mass M of water that has an initial
temperature of 20°C. After a long time, all the ice is
melted and the remaining water is at 0°C. What was the mass
M of the water that was initially in the cup? (Assume no heat can flow
in or out of the cup)
(a) M = 50 g
(b) M = 115 g
(c) M = 135 g
(d) M = 180 g
(e) M = 200 g
(a) A mixture of water and ice at a temperature of 0°C.
(b) Water at a temperature of 0°C.
(c) Ice at a temperature of 0°C.
(a) V0 = V4
(b) V0 > V4
(c) V0 < V4