ASSIGNMENT 4
1. Knight 4.005. [454988] Show Details
Figure Ex4.5 shows an acceleration-versus-force graph for three objects pulled
by rubber bands. The mass of object 2 is 0.4 kg. What are the masses of objects
1 and 3?
mass of object 1
kg
mass of object 3
kg
Figure Ex4.5
2. Knight 4.006. [370358] Show Details
Two rubber bands pulling on an object cause it to accelerate at 1.8 m/s2.
(a) What will be the object's acceleration if it is pulled by eight rubber bands?
m/s2
(b) What will be the acceleration of two of these objects glued together if they are
pulled by two rubber bands?
m/s2
3. Knight 4.009. [370357] Show Details
Figure Ex4.9 shows an object's acceleration-versus-force graph. What is the
object's mass, if each tick mark on the force axis represents 0.35 N and each on
the acceleration axis represents 1.0 m/s2?
kg
Figure Ex4.9
4. Knight 4.029. [454982] Show Details
A constant force is applied to an object, causing the object to accelerate at 7.6
m/s2. What would the acceleration be if each of the following things happened
(from the initial state)?
(a) the force is doubled
m/s2
(b) the object's mass is doubled
m/s2
(c) the force and the object's mass are both doubled
m/s2
(d) the force is doubled and the object's mass is halved
m/s2
5. Knight 4.028. [370355] Show Details
A constant force is applied to an object, causing the object to accelerate at 7
m/s2. What would the acceleration be if the following things were to happen, each
from this initial state?
(a) the force is divided by six
m/s2
(b) the object's mass is divided by six
m/s2
(c) the force and the object's mass are both divided by six
m/s2
(d) the force is divided by six and the object's mass is sextupled
m/s2
6. Rphys 2000.Jun.04. [359311] Show Details
A cart moving across a level surface accelerates uniformly at 1.0 meter per
second2 for 2.0 seconds. What additional information is required to determine the
distance traveled by the cart during this 2.0-second interval?
net force acting on the cart
coefficient of friction between the cart and the surface
mass of the cart
initial velocity of the cart
7. Rphys 2000.Jun.05. [359238] Show Details
In the diagram below, a force, F, is applied to the handle of a lawnmower inclined
at angle to the ground.
What does the magnitude of the horizontal component of force F depend on?
the magnitude of force F, only
neither the magnitude of force F nor the measure of angle
the measure of angle , only
both the magnitude of force F and the measure of angle
8. Rphys 2000.Jun.06. [359269] Show Details
Equilibrium exists in a system where three forces are acting concurrently on an
object. If the system includes a 5.0-newton force due north and a 2.0-newton
force due south, the third force must be what?
7.0 N north
3.0 N south
7.0 N south
3.0 N north
9. Rphys 2000.Jun.07. [359281] Show Details
A ball is thrown straight up with a speed of 12 meters per second near the
surface of Earth. What is the maximum height reached by the ball? [Neglect air
friction.]
15 m
1.2 m
0.37 m
7.3 m
10. Rphys 2000.Jun.10. [359217] Show Details
The vector below represents the resultant of two forces acting concurrently on an
object at point P.
Which pair of vectors best represents two concurrent forces that combine to
produce this resultant force vector?
1
2
3
4