Two hockey pucks, of unequal mass and connected by a spring of negligible mass, rest on a horizontal frictionless surface. The spring is released, and the pucks move apart. The center of mass of the two pucks does one of the following. Does it: w) move in a circle x) move in the direction of the greater mass y) remain stationary z) move in the direction of the smaller mass

1 Answer

Answer :

ANSWER: Y -- REMAIN STATIONARY

Related questions

Description : A firecracker is placed in the middle of a cluster of stationary billiard balls. The firecracker-billiard ball system sits on a frictionless surface. As the firecracker explodes, the balls scatter. What is the momentum ... to the combined speed of the balls y) equal to the mass of the balls z) zero

Last Answer : ANSWER: Z -- ZERO

Description : A spring with a force constant of 20 newtons per meter is known to obey Hooke's Law. The spring is attached to a mass of 5 kilograms and placed on a horizontal, frictionless surface. The ... and released. What is the kinetic energy of the mass as it passes through its equilibrium position? 

Last Answer : ANSWER: 90 JOULES

Description : A 10 kilogram mass rests on a horizontal frictionless surface. A horizontal force of 5 Newtons is applied to the mass. After the force has been applied for 1 second, the velocity of the mass is: w) 0 meters per second x) 0.5 meters per second y) 5 meters per second z) 50 meters per second

Last Answer : ANSWER: X -- 0.5 METERS PER SECOND

Description : An 8 kilogram mass resting on a frictionless horizontal surface is attached to a spring with a force constant of 50 Newtons per meter. If the velocity of the mass through the equilibrium position is 5 meters per second, what is the mass's maximum displacement from equilibrium?

Last Answer : ANSWER: 2 METERS

Description : You are sitting in a frictionless barber chair. The barber decides to have some fun with you, so he spins the chair. As you spin, you find that you can slow down by extending your ... increased your angular momentum y) increased your moment of inertia z) changed the direction of the momentum vector

Last Answer : ANSWER: Y --INCREASED YOUR MOMENT OF INERTIA

Description : Two point masses, M1 and M2, are 14 centimeters apart. M1 has a mass of 2 grams. M2 has a mass of 5 grams. Locate the center-of-mass of this system. w) 4 cm from M1 x) 4 cm from M2 y) 5 cm from M2 z) 7 cm from M1

Last Answer : ANSWER: X -- 4 CM FROM M2

Description : Ten coulombs of charge are placed on a solid copper sphere. Once the charge has come to rest, the ELECTRIC POTENTIAL inside the sphere is found to be: w) zero x) uniform inside the sphere and ... the sphere y) smaller than the electric potential outside the sphere z) varying as one over r squared

Last Answer : ANSWER: X -- UNIFORM INSIDE THE SPHERE AND EQUAL TO THE ELECTRIC POTENTIAL ON THE SURFACE OF THE SPHERE 

Description : Five coulombs of charge are placed on a thin-walled conducting shell. Once the charge has come to rest, the electric potential inside the hollow conducting shell is found to be: w) zero x) uniform ... sphere y) smaller than the electric potential outside the sphere z) varying as one over r squared.

Last Answer : ANSWER: X -- UNIFORM INSIDE THE SPHERE AND EQUAL TO THE ELECTRIC OTENT

Description : Which of the following statements dealing with simple harmonic motion of a mass-spring system is TRUE? w) The acceleration is largest when the oscillating mass is instantaneously at rest. x) The ... of the motion. z) The acceleration is larger when the oscillating mass has its greatest velocity.

Last Answer : ANSWER: W -- THE ACCELERATION IS LARGEST WHEN THE OSCILLATING MASS IS INSTANTANEOUSLY AT REST 

Description : A satellite is observed to move in a circle about the earth at a constant speed. This means that the force acting upon it is: w) zero x) parallel to the direction of the satellite ... velocity y) perpendicular to the direction of the satellite's instantaneous velocity z) none of the above

Last Answer : ANSWER: Y -- PERPENDICULAR TO THE INSTANTANEOUS DIRECTION OF THE SATTELITE’S VELOCITY

Description : Consider a car driving around a circular bend in the road. Which of the following CANNOT be constant? w) velocity of car x) speed of car y) nonrelativistic mass of car z) angular momentum of the car about the center of the circle  

Last Answer : ANSWER: W -- VELOCITY OF CAR

Description : A zinc plate is attached to the knob of a negatively charged electroscope. What will happen to the leaves of the electroscope when ultraviolet light is shown on the zinc plate. Will the leaves: w) collapse at once x) gradually come together y) gradually spread further apart z) remain unaffected

Last Answer : ANSWER: X -- GRADUALLY COME TOGETHER

Description : For a point charge to feel a net force in a homogeneous magnetic field, which one of the following statements is true? The charge must: w) move parallel to the magnetic lines of flux x) have a component of its motion perpendicular to the lines of flux y) be stationary z) be a positive charge

Last Answer : ANSWER: X -- HAVE A COMPONENT OF ITS MOTION PERPENDICULAR TO THE LINES OF FLUX 

Description : A box is initially at rest on a horizontal, frictionless table. If a force of 10 Newtons acts on the box for 3 seconds, what is the momentum of the box at the end of the 3 second interval?

Last Answer : ANSWER: 30 NEWTON-SECONDS or 30 KILOGRAM-METER PER SECOND

Description : Has a NHL hockey game ever run out of pucks?

Last Answer : Same question for baseball – do they ever run out of baseballs during a game? Quick No.

Description : Ten coulombs of positive charge are placed on an irregularly-shaped, solid piece of copper. Once the charge has stopped moving, the electric field inside the copper is: w) zero x) changes as one ... squared y) becomes smaller as you approach the center z) becomes larger as you approach the center

Last Answer : ANSWER: W -- ZERO

Description : Which of the following will increase the ANGULAR MOMENTUM of a person spinning on a rotatable frictionless bar chair? w) moving the arms closer to the body x) moving the arms farther from the body y) ... from the body and the other arm closer to the body with spastic repetition z) none of these

Last Answer : ANSWER: Z -- NONE OF THESE

Description : A ball is thrown horizontally from the top of a cliff. Assuming no air resistance, the acceleration of the ball while it is in flight is: w) in the vertical direction only x) in the horizontal direction only y) in the vertical and horizontal directions z) zero.

Last Answer : ANSWER: W -- IN THE VERTICAL DIRECTION ONLY

Description : An ELECTRON moving horizontally along the +x axis enters a region of space with a horizontal uniform magnetic field pointing in the +y direction. The electron will be deflected: w) -y direction x) +y direction y) -z direction z) +z direction

Last Answer : ANSWER: Y -- -Z DIRECTION

Description : Two waves of equal wavelength will interfere destructively most effectively under one of the following conditions. Will the interference be most effective when the waves are: w) in phase and have equal ... of phase and have equal amplitudes z) 180 degress out of phase and have unequal amplitudes

Last Answer : ANSWER: Y -- 180 DEGREES OUT OF PHASE AND HAVE EQUAL AMPLITUDES  

Description : In an elastic collision, the RELATIVE velocities of separation of the two bodies after impact compared with the relative velocity of approach before impact is: w) always greater x) always smaller y) always the same z) first greater, then smaller

Last Answer : ANSWER: Y -- ALWAYS THE SAME

Description : The minimum number of forces with unequal magnitudes whose vector sum can equal zero is: w) 1 x) 2 y) 3 z) 4

Last Answer : ANSWER: Y -- 3

Description : An object is located 1 meter in front of a converging lens having a focal length of 20 centimeters. At what distance behind the lens (whose thickness is negligible) will the image be formed? w) 18 centimeters x) 20 centimeters y) 22 centimeters z) 25 centimeters

Last Answer : ANSWER: Z -- 25 CENTIMETERS

Description : To a person standing on shore, an object dropped from the mast of a passing sailboat will trace what path, assuming negligible air resistance. Is it: w) vertical straight line x) slanted straight line y) parabola z) hyperbola

Last Answer : ANSWER: Y -- PARABOLA

Description : In an elastic collision between disks A and B of equal mass but unequal radii, A moves along the x-axis and B is stationary before impact. Which of th

Last Answer : In an elastic collision between disks A and B of equal mass but unequal radii, A moves along the x- ... @) and 60^(@)` with the x-axis respectively

Description : If the distance between the centers of mass of two bodies is doubled, the gravitational force between the bodies will become what portion of the original force: w) double x) one half y) remain the same z) one quarter

Last Answer : ANSWER: Z -- ONE QUARTER

Description : A capacitor and a coil are connected in series. The capacitor is charged and allowed to discharge through the coil. The current that will then flow through the capacitor-coil combination will do ... but diminish steadily to zero z) oscillate at high frequency at first but then at slower frequency  

Last Answer : ANSWER: Y -- OSCILLATE BUT DIMINISH STEADILY TO ZERO

Description : A car is moving along a straight horizontal road at a speed of 20 meters per second. The brakes are applied and a constant force of 5000 Newtons decelerates the car to a stop in 10 seconds. The mass of the car is: w) 1250 kilograms x) 2500 kilograms y) 5000 kilograms z) 10,000 kilograms

Last Answer : ANSWER: X -- 2500 KILOGRAMS

Description : The rest mass of an electron is closest to: w) 10-15 kilograms x) 10-17 kilograms y) 10-30 kilograms z) 10-50 kilograms

Last Answer : ANSWER: Y -- 10-30 KILOGRAMS (accept 9.11 x 10-31kg) 

Description : After a projectile is fired horizontally near the earth's surface, the horizontal component of its velocity, neglecting any air resistance: w) increases steadily x) decreases steadily y) first decreases, then increases z) remains constant

Last Answer : ANSWER: Z -- REMAINS CONSTANT 

Description : An object dropped from rest near the Earth's surface will fall how far in the first second: w) 4.9 meters x) 9.8 meters y) 16.0 meters z) 32 meters

Last Answer : ANSWER: W -- 4.9 METERS

Description : Two bodies of equal mass are moving in circular paths at equal speed. The first body moves in a circle whose radius is twice as great as that of the second. The ratio of the centripetal or radial acceleration of the first body to that of the second is: w) 1 to 4 x) 1 to 3 y) 1 to 2 z) 1 to 1

Last Answer : ANSWER: Y -- 1 TO 2

Description : When a 2 kilogram mass is suspended from a spring, the spring stretches 4 cm. The force constant of the spring is approximately:+ w) .5 newtons per meter x) 5 newtons per meter y) 50 newtons per meter z) 500 newtons per meter

Last Answer : ANSWER: Z -- 500 NEWTONS PER METER

Description : A spring with a force constant of 100 Newtons per meter is loaded with a mass of 1.0 kilogram. The period of vibration of this system is: w) .03 seconds x) .06 seconds y) .31 seconds z) .63 seconds

Last Answer : ANSWER: Z -- .63 SECONDS 

Description : As a 10 kilogram mass on the end of a spring passes through its equilibrium position, the kinetic energy of the mass is 20 joules. The speed of the mass is: w) 2.0 meters per second x) 4.0 meters per second y) 5.0 meters per second z) 6.3 meters per second

Last Answer : ANSWER: W -- 2.0 METERS PER SECOND

Description : What law describes the force between two stationary electrically charged objects? w) Ampere's law x) Coulomb's law y) Kirchoff's Rules (pron: kir-koff rules) z) Ohm's law

Last Answer : ANSWER: X -- COULOMB'S LAW

Description : Magnetic fields are produced by: w) resistance x) an electric potential difference y) electric current z) stationary charge

Last Answer : ANSWER: Y -- CURRENT 

Description : In the Compton effect, a photon of wavelength l (read: lambdw) collides with a stationary electron. The wavelength of the emitted photon is: w) longer than l x) shorter than l y) the same as l z) no photon is emitted

Last Answer : ANSWER: W -- LONGER THAN l

Description : The spoon dropped by an astronaut in a satellite will – (1) Fall to the floor (2) Remain stationary (3) Continue to follow the motion of the satellite (4) Move tangentially away

Last Answer : (3) Continue to follow the motion of the satellite Explanation: An orbiting satellite is a projectile in the sense that the only force acting upon an orbiting satellite is the force of gravity. A ... (such as a satellite) would continue in motion with the same speed and in the same direction.

Description : The spoon dropped by an astronaut in a satellite will (1) fall to the floor (2) remain stationary (3) continue to follow the motion of the satellite (4) move tangentially away

Last Answer :  continue to follow the motion of the satellite

Description : Standing waves are formed when two sets of waves of equal amplitude and frequency w) are in phase x) are in opposite phase y) move through each other in opposite directions z) are reflected from the same surface

Last Answer : ANSWER: Y -- MOVE THROUGH EACH OTHER IN OPPOSITE DIRECTIONS 

Description : Of the following choices, approximately how many times greater is the mass of a proton than the mass of an electron? w) 200 x) 2000 y) 20,000 z) 200,000 

Last Answer : ANSWER: X -- 2000

Description : A bond in which there is an unequal attraction for the shared electrons and a resultant unbalanced distribution of charge is which one of the following types of bonds? w) ionic x) pure covalent y) nonpolar covalent z) polar covalent 

Last Answer : ANSWER: Z -- POLAR COVALENT 

Description : Compared to Chlorine, Bromine has: w) smaller atomic size x) higher density y) lower boiling point z) greater number of outer electrons

Last Answer : ANSWER: X -- HIGHER DENSITY

Description : Two stones of unequal masses are thrown vertically up with the same velocity. Which of the following will happen? (1) The heavier mass will reach greater height (2) The lighter mass will reach greater height (3) Both will reach the same height (4) Any of them may reach greater height

Last Answer : (3) Both will reach the same height Explanation: Galileo's experiment showed that if two bodies of unequal masses are dropped from the same height, the time required by them to reach the ground are equal ... reach the ground is equal to unity. This means that both of them will reach the same height.

Description : Two stones of unequal masses are thrown vertically up with the same velocity. Which of the following will happen? (1) The heavier mass will reach greater height (2) The lighter mass will reach greater height (3) Both will reach the same height (4) Any of them may reach greater height

Last Answer : Both will reach the same height

Description : Two coal trains, one southbound, the other westbound, reach an over and under crossing at the same instant and each proceed at 40 kilometers per hour on their respective courses. Approximately how far apart are the lead cars two hours later, to the nearest kilometer? w) 80 x) 113 y) 136 z) 160

Last Answer : ANSWER: X -- 113 

Description : Two negative point charges are 2 meters apart and repel each other with a force of 2 newtons. When the distance between the charges is doubled, the force between them is w) one fourth as great x) one half as great y) twice as great z) four times as great

Last Answer : ANSWER: W -- ONE FOURTH AS GREAT

Description : Under which of the following conditions does the behavior of a real gas resemble that of an ideal gas? Is it: w) under all conditions of temperature and pressure x) only at very high pressure ... when the gas is near condensation z) only at low densities when the molecules are relatively far apart  

Last Answer : ANSWER: Z -- ONLY AT LOW DENSITIES WHEN THE MOLECULES ARE RELATIVELY FAR APART