Physics Rotational Mechanics Level: Misc Level
A uniform disk has a mass of 3.7 kg and a radius of 0. 38 m. The disk is mounted on frictionless bearings and is used as a turntable. The turntable is initially rotating at 20 rpm. A thin -walled hollow cylinder has the same mass and radius as the disk. It is released from rest, just above the turntable, and on the same vertical axis. The hollow cylinder slips on the turntable for 0.20 s until it acquires the same final angular velocity as the turntable. The final angular momentum of the system is closest to:
A) 1.34 kg. m2 /s B) 1.12 kg. m2/s C) 1.68 kg. m2/s D) 0.80 kg. m2 /sE) 0.56 kg. m2/s
Physics Rotational Mechanics Level: Misc Level
A light triangular plate O A B is in a horizontal plane. Three forces, F1=3 N F2 =4 N, and F3 =8 N, act on the plate, which is pivoted about a vertical axes through point O. In Figure 10. 1, the moment arm of F1 about the axis through point O is closest to :
A) 0.90 N.m B) 1.6 N.m C) 1.8 N.m D) 1.1 N.m E) 1.4 N.m
Physics Rotational Mechanics Level: Misc Level
A machinist turns the power on to grinding wheel, at rest, at time t =0 s. The wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 80 rad/s.The wheel is run at that angular velocity for 20 s and then power is shut off.The wheel decelerates uniformly at 1.3 rad/s2 until the wheel stops. In this situation, the angular acceleration of the wheel between t =0 s and t= 10 s is closest to :
A) 8.0 rad/s2 B) 14 rad/s2 C) 13 rad/s2 D) 9.6 rad/s2 E) 11 rad/s2
Physics Rotational Mechanics Level: Misc Level
At time t= 0 s, a wheel has an angular displacement of zero radians and an angular velocity of +31 rad/s. The wheel has a constant acceleration of -0.55 rad /s2. In this situation, the time t, at which the wheel comes to a mandatory halt, is closest to:
A) 56 s B) 37 s C) 65) s D) 47 s E) 28 s
Physics Force & Laws Of Motion Level: Misc Level
A 56 g steel ball is released from rest and falls vertically onto a steel plate. The ball strikes the plate and is in contact with it for 0.5 ms. The ball rebounds elastically, and returns to its original height. The time interval for a round trip is 8.00 s. In this situation, the average force exerted on the ball during contact with the plate is closest to:
A) 4390 N B) 10,260 N C) 5870 N D) 7300 N E) 6210 N
Physics Force & Laws Of Motion Level: Misc Level
A block of mass m =3.7 kg, moving on as frictionless surface with a speed v,=7.7 m/s,makes a perfectly elastic collision with a block of mass M at rest. After the collision, the 3.7 kg block recoils with a speed of v, =2.1 m/s In Figure 8.1, the mass M is closest to:
A) 17 kg B) 6.5 kg C) 3.7 kg D) 9.8 kg E) 4.7 kg
Physics Waves And Oscillations Level: Misc Level
the ship in figure travels along a straight line parellel to the shore and is a distance Y=630 m from the shore. The ships radio recieves simultanious signals of the same frequency from antennas at points A and B which are seperated by X= 890 m. the signals interfere constructively at point C, which is equidistant from A and B. The signal goes through the minimum at point D which is even with B. Determine the wavelength of the radio waves. (in m)
a.) 920.8 b.) 1077.4 c.) 1260.5 d.) 1474.8 e.) 1725.5 f.) 201.9 g.) 2362.1 h.) 2763.6
Physics Waves And Oscillations Level: Misc Level
the speed of sound in air is 346 m/s. If an audible sound has a frequency of 3000 Hz, what is its wavelength in meters?
a.) 1.57*10^-2 b.) 2.08*10^-2 c.) 2.77*10^-2 d.) 3.69*10^-2 e.) 4.90*10^-2 f.) 6.52d*10^-2 g.) 8.67*10^-2 h.) 1.15*10^-1
Physics Waves And Oscillations Level: Misc Level
a pendulum has a period on the earth of 1.04 s. What is its period on the surface of Pluto where g=0.78 m/s^2?
a.) 3.26 b.) 3.69 c.) 4.17 d.) 4.17 e.) 4.71 e.) 5.32 f.) 6.01 g.) 6.80 h.) 7.68
Physics Heat & Thermodynamics Level: Misc Level
a metal wire is the thermal contact with two heat reservoirs at both of its ends. Reservior 1 is at a temp of 694 k, and reservior 2 is at a temp of 263 k. what is the total change in entropy (in J/K) arising from the conduction of 1841 J of heat through the wire.
a.) 4.347 b.) 5.434 c.) 6.793 d.) 8.491 e.) 10.613 f.) 13.267 g.) 16.583 h.) 20.729
Physics Heat & Thermodynamics Level: Misc Level
a gas is compressed at a constant pressure of 0.831 atm from 10.01 L to 7.71 L. During the process, 440 J of energy leaves the gas by heat. What is the change in the internal energy of the gas /(in J)
a.) -134 b.) -151 c.) -171 d.) -193 e.) -218 f.) -246 g.) -278 h.) -315
Physics Heat & Thermodynamics Level: Misc Level
a sample of helium -4 behaves as an ideal gas as it is heated at constant pressure from 290 k to 400 k, If 29 J of work is done by the gas during this process, what is the mass of helium present?
a.) 2.29*10^-2 b.) 3.05*10^-2 c.) 4.06*10^-2 d.) 5.39*10^-2 e.) 7.17*10^-2 f.) 9.54*10^-2 g.) 1.27*10^-1 h.) 1.69*10^-1
Physics Work,Power & Energy Level: Misc Level
a massive piston traps a fixed amount of helium. after being brought to point (a) the system equillibrates at room temp. weight is then added to the piston adiabatically compressing the gas to half of it original volumn (b). the internal energy of the gas at (b) is ----- the internal energy of the gas at (a).
a.) greater than b.) equal to c.) less than
Physics Work,Power & Energy Level: Misc Level
A massive piston traps a fixed amount of helium gas. after being brought to point (a) the system equillibrates at room temp. Weight is then added to the piston adiabatically compressing the gas to half of it orginal volumn (b) . the entropy of the gas at (b) is ---the entropy of the gas at (a). (a) greater than b.) equal to c.) less than
Physics Gravitation Level: Misc Level
We call the acceleration due to gravity on the Earths surface" g" The planet Deneb prime has a mass 260 time that of the Earth and radius of 2 times that of the Earth. Compared to the Earth, what is the acceleration due to gravity on Deneb prime?Express your answer in g s. So if you compute a value for the gravitational acceleration on Deneb prime of, for example 3.2 g, you should simply enter "3.2".
a) 36.75
b) 48.87
c) 65.00
d) 86.45
e) 114.98
