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Total questions: 11
Worksheet time: 1hrs 14mins
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If the velocity of the system increases to twice its original value while its mass remains constant, what happens to the momentum of the system?
decreases to 1/4
decreases to 1/2
increases 2x
increases 4x
A ten-wheeler truck of mass 4,500 kg traveling at 10m/s hits the back of a parked car. The car and its occupants have a total mass of 960 kg. What is the speed of the car and the truck immediately after impact assuming they are locked together? (3 significant values)
8.24 m/s
8.23 m/s
8.22 m/s
8.21 m/s
For a rigid body to be equilibrium, the net force acting on it must be
(a)
A wheel is rotating at an angular speed of 2.0 radians/s. How much torque is needed to accelerate it to 4.0 radians/s in 5 s if moment of inertia og 0.25 kg m/s^2?
0.01 n M
1.00 n M
0.10 n M
10 n M
Which of the following deals with hydrostatics?
Pressure
Bernoulli's equation
Archimedes' principle
Pascal's principle
Torcelli's Theorem
Suppose that a person has aneurysm with an enlarged portion of aorta with a cross-sectional area 50 percent higher than normal. What is the pressure difference between the normal and the enlarged aorta? Assuming the speed of blood is 40 cm/s and the person is lying down. (Hint: 4 significant figures; format: 00.00 Pa)
(a)
Water is flowing through a horizontal pipe of varying cross sections. In section 1, the diameter is 12.0 cm and the pressure is 8.00x10^4 Pa. In section 2, the pipe has a diameter of 6.0 cm and the pressure is 6.00x10^4 Pa. Find the speed of water through sections 1 and 2.
v1 = 1.60 m/s; v2 = 6.50 m/s
v1 = 1.62 m/s; v2 = 6.54 m/s
v1 = 1.64 m/s; v2 = 6.51 m/s
v1 = 1.63 m/s; v2 = 6.52 m/s
A square hole measuring 2.0 cm on each side was cut from a square sheet of brass, 6.0 cm on each side, at 25 degrees Celsius. Find the size of the hole as well as the area of the remaining brass sheet when the sheet is heated to 125 degrees Celsius. (Coefficient of Linear Expansion of Brass = 19 x 10 −6 °C−1 )
4.0 cm^2
3.9 cm^2
4.1 cm^2
3.8 cm^2
A rod that is 1.5 m long is made up of 0.75 m copper and 0.75 m aluminum of equal cross-sectional area and joined end to end. The rod is well insulated that there is no heat loss along the sides. The copper end is at 125 degrees Celsius while the aluminum end is at 25 degrees Celsius. Assuming a steady-state heat conduction, find the (a) amount of heat conducted per unit time and area of rod and (b) temperature T at the copper-aluminum interface. (Format: a = __ J/m^2 s; b = __ degrees Celsius) (Hint: a has 6 significant figures) (No commas)
(a)
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