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50 Cards in this Set
- Front
- Back
Vectors and are shown in the figure. What is |-5.00A + 4.00B|? (Exam 1) |
31.8 |
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What is 34 + (3) × (1.2465) written with the correct number of significant figures? (Exam 1) |
38 |
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The figure represents the velocity of a particle as it travels along the x-axis. At what value (orvalues) of t is the instantaneous acceleration equal to zero? (Exam 1) |
t = 1.0 s |
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An object is moving with constant non-zero acceleration along the +x-axis. A graph of the velocity in the x direction as a function of time for this object is
(Exam 1) |
a straight line making an angle with the time axis.
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A speeding car is traveling at a constant 30.0 m/s when it passes a stationary police car. If the police car delays for 1.00 s before starting, what must be the magnitude of the constant acceleration of the police car to catch the speeding car after the police car travels a distance of 300 m?
(Exam 1) |
7.41 m/s^2
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A boy throws a rock with an initial velocity of 2.15 m/s at 30.0° above the horizontal. If air resistance is negligible, how long does it take for the rock to reach the maximum height of its trajectory, given that g=9.8m/s^2 ?
(Exam 1) |
0.110 s
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A ball is projected upward at time t = 0.0 s, from a point on a roof 90.0 m above the ground.The ball rises, then falls and strikes the ground. The initial velocity of the ball is 36.2 m/s if air resistance is negligible. Given that g=9.8m/s2, the time when the ball strikes the ground is closest to
(Exam 1) |
9.4 s
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The graph to the right shows the velocity(v) of an object as a function of time (t).Which of the graphs below best shows the net force versus time for this object?
(Exam 1) |
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For general projectile motion, when the projectile is at the highest point of its trajectory
(Exam 1) |
its velocity is perpendicular to the acceleration.
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You are standing in a moving bus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. The force acting on you that causes you to fall forward is
(Exam 1) |
No forces were acting on you to cause you to fall. |
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The motion diagram shows an object moving along a curved path at constant speed. At which of the points A, C, and E does the object have zero acceleration? (Exam 1) |
point C only |
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a series ofweights connected by very light cords aregiven an upward acceleration of 4.00 m/s2by a pull P, as shown in the figure. A, B, andC are the tensions in the connecting cords.Given that g=9.8m/s2, The pull P is closest to: (Exam 1) |
690 N. |
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a series ofweights connected by very light cords aregiven an upward acceleration of 4.00 m/s2by a pull P, as shown in the figure. A, B, andC are the tensions in the connecting cords.Given that g=9.8m/s2, The tension force on cord B is closest to: (Exam 1) |
483N. |
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A system comprising blocks, a light frictionless pulley, a frictionless incline, and connectingropes is shown in the figure. The 9.00-kg block accelerates downward when the system is released from rest. Given that g=9.80m/s2, the tension in the rope connecting the 4.00-kgblock and the 9.00-kg block is closest to (Exam 1) |
40.7 N. |
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Blocks A and C are connected by a string as shown. When released, block C accelerates downward.There is friction force between blocks A and B, but no friction force between block A and the table.What will be the direction of the friction force acting on block A fA and on block B fB ? (Exam 1) |
fA is towards the left and fB is towards the right. |
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A 4.00-kg block rests on a 30.0° incline as shown inthe figure. If the coefficient of static friction between the block and the incline is 0.700, what magnitude horizontal force F must act on the block to start it moving up the incline, given g= 9.80m/s2? (Exam 1) |
84.0 N |
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A traveler pulls on a suitcase strap at an angle of 36ºabove the horizontal. If 321 J of workare done by the strap while moving the suitcase a horizontal distance of 15 m, the tension inthe strap is closest to: (Exam 2) |
26 N |
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The work performed as a function of time for a process is given by W = at3, where a = 2.4 J/s3.What is the closest instantaneous power output at t = 2.4 s? (Exam 2) |
41 W |
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A particle is subject to a force Fx that varies with position as in the figure below. Find the workdone by the force on the particle as it moves from x = 0 to x = 15.0 m? (Exam 2) |
30.0 J |
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During a test experiment, the engineer finds an ideal very light spring has already beenstretched 1.4 m from its original length. He also finds that he needs to perform 100 J ofwork to further stretch this spring an additional 1.5 m. The value of the spring constant ofthis spring is closest to: (Exam 2) |
31 N/m |
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The following figure shows three situations in which identical blocks are originally at rest atthe bottom of frictionless ramps. They are then pulled up by an applied force F to the top ofthe ramps, all with the same height h. In all three situations, the magnitude of the force F isidentical. How should we rank the three situations according to the work done on the blockby the applied force F? (Greatest first) (Exam 2) |
(3) > (1) > (2) |
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The following figure shows three situations in which identical blocks are originally at rest atthe bottom of frictionless ramps. They are then pulled up by an applied force F to the top ofthe ramps, all with the same height h. In all three situations, the magnitude of the force F isidentical. how should we rank the situationsaccording to the work done by the gravitational force? (Greatest first) (Exam 2) |
(1) = (2) = (3) |
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The following figure shows three situations in which identical blocks are originally at rest atthe bottom of frictionless ramps. They are then pulled up by an applied force F to the top ofthe ramps, all with the same height h. In all three situations, the magnitude of the force F isidentical.how should we rank the situationsaccording to the instantaneous speed of the block when it reaches the top of the ramp?(Greatest first) (Exam 2) |
(3) > (1) > (2) |
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A block with mass of 2 kg initially rests on a rough horizontal table top. Then anotheridentical block is hung 1 m above the ground by an ideal string passing through an idealpulley to connect to the block on the table top. If the kinetic friction coefficient betweenthe block and the rough table top is 0.30, the speed of the hanging block just before hittingthe ground is closest to (g= 9.8m/s2): (Exam 2) |
2.6 m/s |
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A 0.75 kg block slides on a rough horizontal table top. Just before it hits a horizontal idealspring its speed is 3.5 m/s. It compresses the spring 5.7 cm before coming to rest. Thespring constant is 1200N/m. The energy transferred to heat due to friction in the course ofcompressing the spring is closest to: (Exam 2) |
2.6 J |
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The graph shows the potential energy U for a particle that moves along the x-axis. Theparticle is initially at x = a and moves in the positive x-direction. At which of the labeledx-coordinates is the particle slowing down? (Exam 2) |
at x = c |
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Two objects, one of mass m and the other of mass 2m, are dropped from the top of a building.When they hit the ground, (compare their kinetic energy and momentum) (Exam 2) |
the heavier one will have twice the kinetic energy and momentum of the lighter one. |
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Two identical balls are thrown directly upward, ball A at speed v and ball B at speed 2v,and they feel no air resistance. Which statement about these balls is correct? (Exam 2) |
Ball B will go four times as high as ball A because it had four times the initial kineticenergy. |
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A rifle of mass M is initially at rest but free to recoil. It fires a bullet of mass m and velocityv (relative to the ground). After firing, the velocity of the rifle (relative to the ground) is: (Exam 2) |
- mv/M |
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Two carts move freely along a frictionless horizontal track. A cart of mass 2m is movingwith speed 3v to the right towards a cart of mass 4m moving to the left at speed 2v. Ifthe carts stick together after impact, their final velocity is: (Exam 2) |
(1/3)v to the left |
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Two carts move freely along a frictionless horizontal track. A cart of mass 2m is moving withspeed v to the right toward a stationary cart of mass m. If the collision is elastic, after impactthe velocity for the cart of mass 2m is: (Exam 2) |
(1/3)v to the right |
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Particle 1 of mass m moves at a speed of 3v in the positive x-direction and particle 2 ofmass 2m moves at a speed of 2v in the negative y direction right before their collision.After the collision, particle 2 stops moving. What is the speed of particle 1 after thecollision? (Exam 2) |
5v |
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In the figure, four point masses are placed as shown. The x and y coordinates of thecenter of mass are closest to (Exam 2) |
(2.3 m, 2.8 m). |
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As shown in the figure, a block of mass M, at rest on a horizontal frictionless table, isattached to a rigid support by a spring of constant k. A bullet of mass m and velocity of vstrikes and is embedded in the block. How much will the spring be compressed when massM (with the bullet in it) first comes to a stop? (Exam 2) |
m v /sqrt( k(m+ M)) |
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A particle moves with constant speed around the circle shown below. When it is at pointA its coordinates are x = 0, y = 2 m and its velocity is(- 4 m/s) i . When it is at point B its velocity andacceleration are: |
- (4 m/s) j and (8 m/s2)i , respectively |
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Four identical solid balls, each with a mass of 1 kg, are connected with massless rods to form asquare with sides of length L = 50 cm. In case 1, the masses rotate about an axis that bisects twosides of the square. In case 2, the masses rotate about an axis that passes through the diagonal ofthe square, as shown in the figure. Compute the ratio of the moments of inertia, I1/I2, for the twocases. |
I1/I2 =1 |
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You want to double the radius of a rotating solid sphere (moment of inertia= 2 /5MR^2 )while keeping its kinetic energy constant. (The mass does not change.) To do this, thefinal angular velocity of the sphere must be? |
1/2 of its initial value. |
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a 4.50-kg wheel that is 34.5 cm in diameter rotates through an angle of13.8 rad as it slows down uniformly from 22.0 rad/s to 13.5 rad/s. What is the magnitude of the angular acceleration of the wheel? |
10.9 rad/s2 |
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a 4.50-kg wheel that is 34.5 cm in diameter rotates through an angle of13.8 rad as it slows down uniformly from 22.0 rad/s to 13.5 rad/s. What is the magnitude of the tangential acceleration of the wheel? |
1.88 m/s2 |
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A 95 N force exerted at the end of a .05 m long torque wrench gives rise to a torqueof 15 Nm. What is the closest angle (assumed to be less than 90°) between thewrench handle and the direction of the applied force? |
18° |
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A 2.00 kg thin hoop (moment of inertia I= MR2) with a 50.0 cm radius rolls down a 30-degree slope without slipping. If the hoop starts at rest at the top of the slope, what is itstranslational velocity after it rolls 10 m along the slope? (Given g=9.81 m/s2) |
7.00 m/s |
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While spinning down from 500.0 rpm to rest, a solid uniform flywheel (moment ofinertia= 1/2 MR^2 ) does 5.1 kJ of work. If the radius of the disk is 1.2 m, what is themass of the flywheel? |
5.2 kg |
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A wheel has a radius of 0.40 m and is mounted on frictionless bearings. A block issuspended from a rope that is wound on the wheel and attached to it (see figure). Thewheel is released from rest and the block descends 1.5 m in 2.00 s without any slippingof the rope. The tension in the rope during the descent of the block is 20 N. What is themoment of inertia of the wheel? |
4.3 kg · m2 |
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A metal bar is hanging from a hook inthe ceiling when it is suddenly struckby a ball that is moving horizontally(see right figure). The ball is coveredwith glue, so it sticks to the barafterwards. During this collision |
the angular momentum of the system (ball and bar) is conserved about the hookbecause neither the hook nor gravity exerts any torque on this system about the hook. |
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The planet Saturn has 100 times the mass of the earth and is 10 times more distant fromthe sun than the earth is. Compared to the earth’s acceleration as it orbits the sun, theacceleration of Saturn as it orbits the sun is: (Newton 2nd law F=ma) |
1/100 as great |
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Which of the following are in static equilibrium? |
none of the above |
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A 0.25 kg ideal harmonic oscillator with spring system has a total mechanical energyof 4.0 J. If the oscillation amplitude is 20.0 cm, what is the oscillation frequency? |
4.5 Hz |
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How long must a pendulum on the Moon be if it is to have a period of 2.00 seconds?(Acceleration of gravity on the moon is 1.62 m/s2.) |
16.4 cm |
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A 2.40 kg ball is attached to an unknown spring and allowed to osciallate. Thefollowing figure shows a graph of the ball’s position x as a function of time t. What isthe oscillations angular frequency and force constant of the spring? |
7.85 rad/s; 148 N/m |
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This is an x-t graph for an object in simple harmonic motion. At which of the followingtimes does the object have the most negative velocity vx and most positive accelerationax, respectively? |
t = T/4 and t= T/2 |
