Title: OAIP
Course: Physics copy 1

Q: A 2 kg stone at the end of a string 1.0 m long is whirled in a vertical plane with an average speed of 4.0 m/s. The tension in the string when the stone is at the bottom of the circle is
- 0 N
- 12 N
- 20 N
- 32 N
- 52 N
A: 52 N

Q: A 500 kg minicar rounds a bend on an unbanked highway at a speed of 20 Is. The radius of curvature of the bend is 50 m. What is the magnitude of the force that must be exerted on the wheels by the road to keep the car travelling in this curved path without skidding?
- 0 N
- 0.20 kN
- 3.2 kN
- 4.0 kN
- 5.0 kN
A: 4.0 kN

Q: A ball falls from rest in oil.
[Image: graduated cylinder with a ball in it]
It experiences a retarding force which is directly proportional to its velocity. Which graph best represents the acceleration of the ball as a function of its time of fall from rest?
[Image: several graphs]
- A
- B
- C
- D
- E
A: A

Q: 17A ball falls from rest in oil.
[Image: graduated cylinder with ball in oil]
It experiences a retarding force which is directly proportional to its velocity.Which graph best represents the velocity of the ball as a function of its time of fall from rest?
[Image: proportionalities]
- A
- B
- C
- D
- E
A: C

Q: A boy and a girl are sitting in the cafeteria eating lunch. They move so that the distance between them is now one-quarter as great as it was before. The force of attraction between them (gravitational, that is) is now about
- one-sixteenth as great
- one-quarter as great
- four times as great
- eight times as great
- sixteen times as great
A: sixteen times as great

Q: A constant force is used to accelerate an object from rest along a smooth horizontal surface. Which single graph, or pair of graphs, shown below correctly describes the resulting motion of the object? ( d = distance, t = time, v = speed)
[Image: graphs]
- I only
- II only
- III only
- II and III only
- I and IV only
A: II and III only

Q: A force is applied, as shown, to a 20 kg object in contact with a frictionless wall.
[Image: thing on a wall]
The minimum force, F, in newtons, required to prevent the object from sliding down the wall is
- {10
- 20
- 100
- 200
- 400
A: 400

Q: A forward moving car is coasting to a stop on a straight, level road. The net external force on the car must be
- zero
- forward
- backward
- downward
- upward
A: backward

Q: A rubber ball moves at constant speed in a horizontal circular path. A centripetal force of 20 N causes the ball to move in a circle of 1 m radius at a frequency of 4 Hz. If the centripetal force were 20 N and the radius 0.25 m, the frequency of rotation would be
- 1 Hz
- 2 Hz
- 4 Hz
- 8 Hz
- 16 Hz
A: 8 Hz

Q: A rubber ball moves at constant speed in a horizontal circular path. A centripetal force of 20 N causes the ball to move in a circle of 1 m radius at a frequency of 4 Hz. If the centripetal force were 80 N and the radius 1 m, the frequency of rotation would be
- 1 Hz
- 2 Hz
- 4 Hz
- 8 Hz
- 16 Hz
A: 1 Hz

Q: 24. A satellite is placed in a circular orbit about the earth at a height of 100 km above the surface. If the earth's radius is 6400 km, the value of the gravitational field at the satellite is approximately
- (6400/6500)^2 x 10 m/s^2
- (65 00/6400)^ 2 x 10 m/s^2
- (6400/6500) x 10 m/s^2
- (6650/6400) x 10 m/s^2
- 10 m/s^2
A: (6400/6500)^2 x 10 m/s^2

Q: A satellite is in a circular orbit above the earth's atmosphere. In the absence of friction, which of the following statements is true?
- Its acceleration and velocity are in the same direction.
- There is no force acting on it.
- Its velocity is constant.
- It must fall back to earth when its fuel is exhausted.
- It is accelerating towards the earth.
A: It is accelerating towards the earth.

Q: A small projectile is launched horizontally in a vacuum and follows a path from X through Y as shown.
[Image: path of a projectile]
Choose the vector which best represents the net force acting on the particle at Y.
[Image: several vectors]
- A
- B
- C
- D
- E
A: B

Q: A student was working on a satellite problem and had simplified the solution as far as 57.3 N $$\cdot$$ s^2/m.

The student was solving for
- force
- mass
- acceleration
- period
- radius
A: mass

Q: submarine is travelling underwater at a constant velocity. Which diagram best represents the forces acting on the submarine?
[Image: submarine vectors]
- A
- B
- C
- D
- E
A: D

Q: An airplane moves in straight level flight at constant velocity. What is the net force acting on it if the mass of the plane is 1000 kg. and the frictional drag of the air is 1800 N?
- 11 800 N
- 10 000 N
- 1800 N
- 0
- insufficient information is given to determine the net force
A: 0

Q: An astronaut experiences a force of gravity of 1000 N on Venus. Uranus has 18 times the mass and 4 times the radius of Venus. The force of gravity, in newtons, that the astronaut would experience on Uranus is
- 1000
- 1000 x 18/4
- 1000 x 4/18
- 1000 x 18/16
- 1000 x 16/18
A: 1000 x 18/16

Q: An object is raised from the surface of the earth to a height of two earth radii. Which of the following is correct?
- The mass of the object decreases and the forceof gravity on the object remains constant.
- The mass of the object and the force of gravity on the object both remain constant.
- The mass of the object remains constant and the force of gravity on the object decreases.
- Both the mass and the force of gravity on the object decrease.
- The mass of the object remains constant and the force of gravity on the object increases.
A: The mass of the object remains constant and the force of gravity on the object decreases.

Q: An object is-made to move in a circular orbit by a centripetal force F. If the mass is tripled and the speed halved while the radius is kept constant, the force required is
- 3F/2
- 3F/4
- 9 F/4
- 6 F
- 12F
A: 3F/4

Q: An object moves in a circular path at constant speed. If the radius of the path is doubled but the speed remains the same, the centripetal force is
- twice as great
- half as great
- four times as great
- one fourth as great
- unchanged
A: half as great

Q: An object moving at a constant velocity must
- have a net force acting on it
- eventually stop due to the force of gravity
- not have any force of gravity acting on it
- have all forces that act on it balancing each other
- have no force of friction acting on it
A: have all forces that act on it balancing each other

Q: An object on the surface of the earth (at a distance R from the centre) experiences a gravitational force of 90 N. At a distance of 3R from the centre of the earth the same object will experience a force of
- 10 N
- 30 N
- 90 N
- 270 N
- 810 N
A: 10 N

Q: An object travelling in a straight line toward a point P is found to be 40 m, 32 m, 22 m and 10 m from point P at the ends of 4 successive seconds.

The net force exerted on the object is
- constant and acts in the direction of the motion
- increasing and acts in the direction of the motion
- constant and acts in the direction opposite to the motion
- increasing and acts in the direction opposite to the motion
- decreasing and acts in the direction opposite to the motion
A: constant and acts in the direction of the motion

Q: Assume that the earth suddenly shrank to one-half its original diameter, but that its mass remained unchanged. Under these circumstances, the force of gravity on a person standing on the earth's surface would be
- four times as great
- twice as great
- the same
- one-half as great
- one-fourth as great
A: four times as great

Q: If an object is moving in a straight line due west with its speed changing, the net force acting on the object
- must be zero
- must be west
- 4must be east
- must be east or west
- could be east, west or zero
A: must be east or west

Q: [Image: vectors on a graph]
If an object is subjected to the combination of forces shown in the above diagram, which one of the following forces also would have to be applied in order for the object to move with uniform velocity?
- 1 N west
- 1 N east
- 1.2 N in the direction MP
- 13.2 N in a direction toward point M
- No additional force is required to produce uniform velocity.
A: 1 N west

Q: If the separation between the centres of two masses is reduced to 1/3 of its former value, the gravitational force between them changes by a factor of
- 1/9
- 1/3
- 3
- 6
- 9
A: 9

Q: Several masses m are determined to be equal by comparing them on an equal-arm balance, and a large mass M is found just to balance two of the small ones on a similar balance. The mass M and one of the masses m are each forced to go around a curve of 1.0 m radius at a constant speed of 1.0 m/s. As they move around this curve the magnitudes of the forces acting on them are
- equal
- in the ratio of 4 to 1
- in the ratio of 2 to 1
- zero
- none of the above
A: in the ratio of 2 to 1

Q: The diagram shows a motor driving a pump by means of a belt. The pump pulley diameter is twice the motor pulley diameter.
[Image: pulleys]

There is a red spot (R) and a green spot (G) on the belt.Which one of the following equations correctly relates the magnitudes of the acceleration (as)of the green spot and the acceleration (a_R) of the red spot at the time shown?
- a _G
- 4a_R
- a_G
- 2a_R
- a_G
- a_R
- a_G
- a_R/2
- a_G
- a_R/4
A: 4a_R / a_G / 2a_R / a_R / a_R/2 / a_R/4

Q: The driver of a 1000 kg car tries to turn through a circle of radius 100 m on an unbanked curve at a speed of 10 m/s. The force of friction between the road and car wheels is 900 N. The car will
- slide into the inside of the curve
- make the turn and could go even faster
- make the turn, but at its maximum safe speed
- make the turn if it increases speed
- slide off to the outside of the curve
A: slide off to the outside of the curve

Q: The figure below represents a multiple-flash photograph taken by an experimenter while studying the motion of a steel ball projected into the air.
[Image: pathofaprojectile]
The ball was photographed through a narrow slit near the edge of a disc spinning at constant speed. The black streaks indicate the path of the ball during the intervals when the slit is in front of the open camera shutter. Sets of measurements which can be made on such a photo include:

- the length of each streak, such as KL
- the horizontal extent of each streak,such as KM
- the vertical extent of each streak,such as LM
- the horizontal distance between the centres of successive streaks,such as NQ the vertical distance between the centres of successive streaks, such as QP

If air resistance were eliminated, in which of the following sets would all the measurements be the same?
- Only the horizontal extent of each streak.
- Only the horizontal distance between the centres of successive streaks.
- Both the horizontal extent of each streak and the horizontal distance between the centres of successive streaks.
- Some other of the listed sets or combination of sets of measurements.
- None of the sets listed.
A: Both the horizontal extent of each streak and the horizontal distance between the centres of successive streaks.

Q: The force of gravity on a mass at two earth radii from the centre of the earth is 200 N. The force, in Newtons, on this mass at a distance of ten earth radii from the earth's centre would be
- 2
- 8
- 20
- 40
- 2000
A: 8

Q: The upward forces acting on an elevator total 5.0 kN. The only other force acting on the elevator is the downward force of gravity of 5.0 kN. The elevator could be moving
- upward with increasing speed
- upward with decreasing speed
- downward with increasing speed
- downward with decreasing speed
- upward with constant speed
A: upward with constant speed

Q: Two metal spheres, each of mass 5 kg, are fixed in position at points X and Y as shown in the diagram below. A third sphere of mass 0.01 kg is released from rest at point P and is affected only by the forces of gravitational attraction exerted on it by the masses at points X and Y. Point Z is located exactly midway between points X and Y. After the smaller mass is released from point P, the mass will
- move with constant speed
- move with constant velocity
- move with constant acceleration
- move with varying acceleration
- undergo a change in total energy
A: move with varying acceleration

Q: Two metal spheres, each of mass 5 kg, are fixed in position at points X and Y, as shown in the diagram below.
[Image: three spheres]
A third sphere of mass 1/100 kg is released from rest at point P and is affected only by the forces of gravitational attraction exerted on it by the masses at points X and Y. Point Z is located exactly midway between points X and Y. The gravitational constant is represented by the symbol "G". The gravitational force, in newtons, exerted by each one of the 5 kg masses on the smaller mass at the instant it is released from point P is
- 25G/2
- 25G/4
- 5G/2
- 2G/40
- G/40
A: G/40

Q: Two metal spheres, each of mass 5 kg, are fixed in position at points X and Y as shown in the diagram below.
[Image: two spheres]
A third sphere of mass 1/100 kg is released from rest at point Z and is affected only by the forces of gravitational attraction exerted on it by the masses at points X and Y. Point Z is located exactly midway between points X and Y. The gravitational constant is represented by the symbol "G". The net force, in newtons, acting on the smaller mass at the instant of release would be
- 25 x G
- 10 x G
- G/10
- G/20
- zero
A: zero

Q: Two sacks of marbles are hung one metre apart. Which of the following would approximately double the gravitational force that one sack of marbles exerts on the other sack?
- doubling the number of marbles in one sack only
- doubling the number of marbles in both sacks
- moving them closer, to one-half the separation
- moving them further apart, to twice the separation
- moving them further apart, to four times the separation
A: doubling the number of marbles in one sack only

Q: Vectors W, X, Y and Z represent forces of equal magnitude acting on a point P as shown.
[Image: vectors]

Which of the following vectors best represents the resultant (net) force acting on P?
[Image: vectors]
- A
- B
- C
- D
- E
A: A

Q: Which one of the following graphs best represents gravitational force F versus distance r for a rocket leaving the earth?
[Image: several graphs]
- A
- B
- C
- D
- E
A: E

Q: [Image: table]
With reference to the data above, the gravitational force between the two masses X and Y in System II in newtons must be
- F/4
- F/2
- F
- 2F
- 4 F
A: F/4