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Physics

memorize.aimemorize.ai (lvl 286)
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39 cards
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Section 1

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The planet Mars has mass 6.4x10^23 kg and radius 3.4x10^6 meters. The acceleration of an object in free-fall near the surface of Mars is most nearly...zero, 1.0m/s^2, 1.9m/s^2, 3.7m/s^2, 9.8m/s^2?

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6 years ago

Date created

Mar 1, 2020

Cards (39)

Section 1

(39 cards)

The planet Mars has mass 6.4x10^23 kg and radius 3.4x10^6 meters. The acceleration of an object in free-fall near the surface of Mars is most nearly...zero, 1.0m/s^2, 1.9m/s^2, 3.7m/s^2, 9.8m/s^2?

Front

3.7m/s^2

Back

A ball attached to a string is whirled around in a horizontal circle having a radius r. If the radius of the circle is changed to 4r and the same centripetal force is applied by the string, the new speed of the ball is which of the following?

Front

Twice the original speed

Back

A truck traveled 400 meters north in 80 seconds, and then it traveled 300 meters east in 70 seconds. The magnitude of the average velocity of the truck was most nearly 1.2m/s, 3.3m/s, 4.6m/s, 6.6m/s, 9.3m/s

Front

3.3m/s

Back

A weight lifter lifts a mass m at constant speed to a height h in time t. What is the average power output of the weight lifter? mg, mh, mgh, mght, or mgh/t?

Front

mgh/t

Back

Each of five satellites makes a circular orbit about an object that is much more massive than any of the satellites. The mass and orbital radius of each satellite are given below. Which has the greatest speed?

Front

The one with the smallest radius. Mass: m and Radius: 1/2r

Back

A ball falls straight down through the air under the influence of gravity. There is a retarding force F on the ball with magnitude given by F = bv, where v is the speed of the ball and b is a positive constant. The magnitude of the acceleration of the ball at any time is equal to which of the following? g - (bv/m), g + (bv/m)

Front

g - (bv/m)

Back

Two planets have the same size, but different masses, and no atmospheres. Which of the following would be the same for objects with equal mass on the surfaces of the two planets? I. The rate at which each would fall freely II. The amount of mass each would balance on an equal-arm balance III. The amount of momentum each would acquire when given a certain impulse

Front

II and III only

Back

A horizontal force F is used to pull a 5-kilogram block across a floor at a constant speed of 3 m/s. The frictional force between the block and the floor is 10 newtons. The work done by the force F in 1 minute is most nearly 0 J, 30 J, 600 J, 1,350 J, 1,800 J

Front

1,800 J

Back

In which of the following situations would an object be accelerated? I. It moves in a straight line at constant speed. II. It moves with uniform circular motion. III. It travels as a projectile in a gravitational field with negligible air resistance.

Front

II and III only

Back

A railroad flatcar of mass 2,000 kg rolls to the right at 10 m/s and collides with a flatcar of mass 3000 kg that is rolling to the left at 5 m/s. The flatcars couple together. Their speed after the collision is...1m/s, 2.5m/s, 5m/s, 7m/s, ot 7.5m/s?

Front

1m/s

Back

Which of the following quantities that is a scalar that is always positive or zero? power, work, kinetic energy, linear momentum, angular momentum

Front

kinetic energy

Back

When a person stands on a rotating merry-go-round, the frictional force exerted on the person by the merry-go-round is...?

Front

opposite in direction to the frictional force exerted on the merry-go-round by the person

Back

An automobile at constant speed down one hill and up another hill along the smoothly curved surface shown above. Which of the following diagrams best represents the directions of the velocity and the acceleration of the automobile at the instant that it is at the lowest position, as shown. 1) velocity rightward acceleration downward b) velocity rightward acceleration upward

Front

b)

Back

An object weighing 4 newtons swings on the end of a string as a simple pendulum. At the bottom of the swing, the tension in the string is 6 newtons. What is the magnitude of the centripetal acceleration of the object at the bottom of the swing? 0, 1/2g, g, 3/2g, 5/2g

Front

1/2g

Back

[ I ]-------------[ II ] Two pucks are attached by a stretched spring and are initially held at rest on a frictionless surface, as shown above. The pucks are then released simultaneously. If puck I has three times the mass of puck II, which of the following quantities is the same for both pucks as the spring pulls the two pucks toward each other? speed, velocity, acceleration, kinetic energy, magnitude of momentum

Front

magnitude of momentum (POP POP!)

Back

A 2-kilogram block rests at the edge of a platform that is 10 m above level ground. The block is launched horizontally from the edge of the platform with an initial speed of 3 m/s. Air resistance is negligible. The time it will take for the block to reach the ground is most nearly... 0.3s, 1.0s, 1.4s, 2.0s, 3.0s

Front

1.4s

Back

A car initially travels north and then turns to the left along a circular curve. This causes a package on the seat of the car to slide toward the right side of the car. Which of the following is true of the net force on the package while it is sliding?

Front

There is not enough force directed toward the center of the circle to keep the package from sliding.

Back

A block of mass m slides on a horizontal frictionless table with an initial speed v0. It then compresses a spring of force constant k and is brought to rest. How much is the spring compressed from its natural length?

Front

sqrt(m/k)*v0

Back

A push broom of mass m is pushed across a rough horizontal floor by a force of magnitude T directed at angle theta as shown above. The coefficient of friction between the broom and the floor is mu. The frictional force on the broom has magnitude mu(mg+Tsin(x)), mu(mg-T(sin(X)), mu(mg+Tcos(x)), mu(mg-T(cos(X)),

Front

mu(mg+Tsin(x))

Back

A body moving in the positive x direction passes the origin at time t = 0. Between t = 0 and t = 1 second, the body has a constant speed of 24 m/s. At t = 1 second, the body is given a constant acceleration of 6 m/s squared in the negative x direction. The position x of the body at t = 11 seconds is +99m, +36m, -36m, -75m, -99m

Front

-36m

Back

An ideal spring obeys Hook's law, F = -kx. A mass os 0.50kg kilogram hung vertically from this spring stretches the spring 0.075 meter. The value or the force constant for the spring is most nearly...0.66N/m, 6.6N/m, or 66N/m?

Front

66N/m

Back

If spacecraft X has twice the mass of Spacecraft Y, then true statements about X and Y include which of the following? I. On earth, X experiences twice the gravitational force that Y experiences II. On the moon, X has twice the weight of Y. III. When both are in the same circular orbit, X has twice the centripetal acceleration of Y.

Front

I and II only

Back

If the mass of a simple pendulum is double but its length remains constant, its period is multiplied by a factor of...1/2, 1/sqrt(1/2), 1, sqrt(2), or 2?

Front

1

Back

Two bodies of masses 5 and 7 kilograms are initially at rest on a horizontally frictionless surface. A light spring is compressed between the bodies, which are held together by a thin thread. After the spring is released by burning through the thread, the 5-kilogram body has a speed of 1/5 meter per second. The speed of the 7-kilogram body is 1/12 m/s, 1/7 m/s, 1/5 m/s, 7/25 m/s

Front

1/7m/s

Back

The speed of the ball at point II is most nearly 3.0m/s, 4.5m/s, 9.8m/s, 14m/s, 20m/s

Front

4.5m/s

Back

A racing car is moving around the circular track of radius 300 meters. At the instant when the car's velocity is directed east, its acceleration is directed due south and has a magnitude of 3 meters per second squared. When viewed from above, the car is moving... clockwise at 30 m/s, clockwise at 10m/s, counterclockwise at 30m/s, counterclockwise at 10 m/s

Front

clockwise at 30 m/s

Back

Which of the following is true when an object of mass m moving on a horizontal frictionless surface hits and sticks to an object of mass M > m, which is initially at rest on the surface?

Front

The speed of the objects that are stuck together will be less than the initial speed of the less-massive object.

Back

A person weighing 800 newtons on Earth travels to another planet with twice the mass and twice the radius of Earth. The person's weight on this other planet is most nearly 400 N, 800/sqrt(2)N, 800 N, 800*sqrt(2)N, 1600 N

Front

400 N

Back

The length of a simple pendulum with a period on Earth of one second is most nearly 0.12 m, 0.25 m, 0.50 m, 1.0 m, 10.0m

Front

0.25 m

Back

Image: a sine graph where the y-axis is Displacement and the x-axis is Time An object is attached to a spring and oscillates with amplitude A and period T as represented on the graph above. The nature of the velocity v and acceleration a of the object at time T/4 is best represented by which of the following? a) v > 0, a > 0 b) v > 0, a < 0 c) v > 0, a = 0 d) v = 0, a < 0

Front

d) v = 0, a < 0

Back

Which of the following is true for a system consisting of a mass oscillating on the end of an ideal spring?

Front

The maximum kinetic energy and maximum potential energy are equal, but occur at different times.

Back

When a mass is attached to a spring, the period of oscillation is approximately 2.0 seconds. When the mass attached to the spring is doubled, the period of oscillation is most nearly...0.5s, 1.0s, 1.4s, 2.0s, 2.8s?

Front

2.8

Back

O o The two spheres pictured above have equal densities and are subject only to their mutual gravitational attraction. Which of the following quantities must have the same magnitude for both spheres? Acceleration, velocity, kinetic energy, displacement from the center of mass, gravitational force

Front

gravitational force

Back

A person pushes a box across a horizontal surface at a constant speed of 0.5m/s. The box has a mass of 40 kilograms and the coefficient of sliding friction is 0.25. The power supplied to the box by the person is....? 0.2 W, 5 W, 50 W, 100 W, 200 W

Front

50 W

Back

An object is released from rest on a planet that has no atmosphere. The object falls freely for 3.0 meters in the first second. What is the magnitude of the acceleration due to gravity on the planet? 1.5m/s^2, 3.0m/s^2, 6.0m/s^2, 10.0m/s^2, 12.0m/s^2

Front

6.0m/s^2

Back

Two objects having the same mass travel toward each other on a flat surface, each with a speed of 10 m/s relative to surface. The objects collide head-on and are reported to rebound after the collision, each with a speed of 20 m/s relative to the surface. Which of the following assessments of this report is most accurate?

Front

If potential energy was released to the objects during the collision, the report could be true.

Back

____________________ / \ P * < the sun Q \ ____________________/ An asteroid moves in an elliptic orbit with the Sun at one focus as shown above. Which of the following quantities increases as the asteroid moves from point P in its orbit to point Q?

Front

Potential energy

Back

A diver initially moving horizontally with speed v dives off the edge of a vertical cliff and lands in the water a distance d from the base of the cliff. How far from the base of the cliff would the diver have landed if the diver initially had been moving horizontally with a speed 2v? sqrt(2d), 2d

Front

2d

Back

A satellite of mass M moves in a circular orbit of radius R at constant speed v. Which of the following must be true? I. The net force on the satellite is equal to (mv^2)/R and is directed toward the center of the orbit. II. The net work done on the satellite by the gravity in one revolution is zero. III. the angular momentum of the satellite is a constant

Front

i, ii, and iii!! all of it!!! ALL OF IT!!!!!!!!!!!!111oneone!!!

Back