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Descriptive Physics Conceptual Questions
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1.
1 point
A circle of radius r = 3 m is chalked onto pavement. A box sits on the edge of the circle. If you push the box with force F all the way around the circle, how much work do you do?
Wp = 2piFr
Wp ~ 6Fr
Wp = 4Fp
both a and b
2.
1 point
An object is charged. Which of the following are possible amounts of charge on the object?
1.602e-19 C
1.602e-22 C
0.801e-18 C
16 uC
a, c and d
3.
1 point
Three pithballs are suspended from thin threads. Various objects are then rubbed against other objects and each of the pithballs is charged by touching them with one of these objects. It is found that pithballs 1 and 2 attract each other and that pithballs 2 and 3 repel each other. From this we can conclude that
1 and 3 carry charges of equal sign.
one of the objects carries no charge.
1 and 3 carry charges of opposite sign.
all three carry the charges of the same sign.
4.
1 point
Given a solid sphere, a solid cylinder and a hoop of identical masses, which would have a greater resistance to being rotated?
all the same
sphere
cylinder
hoop
5.
1 point
Suppose rain falls vertically into an open cart rolling along a straight horizontal track with negligible friction. As a result of the accumulating water, the speed of the cart
increases
not enough information
decreases
does not change
6.
1 point
Two uniformly charged spheres are firmly fastened to and electrically insulated from frictionless pucks on an air table. The charge on sphere 2 is three times the charge on sphere 1. Which force diagram correctly shows the magnitude and direction of the electrostatic forces:
O--> O----->
O -->
<--O O-->
<--O O----->
7.
1 point
A car is going 10 mph. The driver hits the brakes, after which the car travels 3 more feet before stopping. Later, the same car is going 20 mph (on the same surface). The driver hits the brakes. How far does the car go after the brakes are applied?
12 ft
9 ft
6 ft
3 ft
15 ft
8.
1 point
You drop a stone down a deep well. If it has travelled 5 m after the first second, how far has it travelled after 2 s?
20 m
10 m
15 m
5 m
9.
1 point
A stone is thrown straight upward. At the top of its path its velocity is momentarily 0 m/s. What is its acceleration at this point?
Greater than 9.8 m/s^2
9.8 m/s^2
Greater than 0 m/s^2 but less than 9.8 m/s^2
0 m/s^2
10.
1 point
The key principle of the Bosun's chair is that the passenger
will be weightless in free fall.
is part of a system where the total energy is conserved.
has two upward forces acting on her and only one downward force.
stays in motion if already in motion; otherwise she stays at rest.
11.
1 point
Here is a vector called Q. By dropping a line straight down from the vector's tip, we obtain a right triangle. Using trigonometry, Qx and Qy are:
Qcos and Qsin
Qcosθ and Qsinθ
Qtanθ and Qsinθ
Qcosθ and Qtanθ
12.
1 point
A constant force is exerted for a short time interval on a cart that is initially at rest on an air track. This force gives the cart a certain final speed. The same force is exerted for the same length of time on another cart, also initially at rest, that has twice the mass of the first one. The final speed of the heavier cart is
four times that of the lighter cart.
the same as that of the lighter cart.
double that of the lighter cart.
½ that of the lighter cart.
13.
1 point
A key equation of kinematic theory is x(t)=Xo+Vot+½ at^2 In order to check that this equation does indeed accurately predict how an object moves in space and time, what are the two most important properties of the object that you would have to measure?
x(t)-Xo and t
v(t) and t
x(t) and θ
x(t)-Xo and v(t)
14.
1 point
Suppose you drop a 1 kg block of lead that is ice cold (T ~ 0 degC) into a beaker congaing 1 kg of water that is very hot (T ~ 100 degC). What will the equilibrium temperature be? About
97 degC
3 degC
50 degC
75 degC
15.
1 point
A constant force is exerted on a cart that is initially at rest on an air track. Friction between the cart and the track is negligible. The force acts for a short time interval and gives the cart a certain final speed. To reach the same final speed with a force that is only half as big, the force must be exerted on the cart for a time interval
½ as long as the stronger force.
2 times as long as the stronger force.
4 times as long as the stronger force.
equal to the stronger force.
16.
1 point
Speakers A and B play the same C note (262 Hz). The speaker at point B is turned off and then turned back on but at minimum volume.
As the volume of speaker B is increased, the listener at point D hears
a decrease in volume, then an increase in volume.
an increase in volume then a decrease in volume.
a steady decrease in volume.
a steady increase in volume.
17.
1 point
A ladybug sits at the outer edge of a merry-go-round, that is turning and slowing down. At the instant shown in the figure, the tangential component of the ladybug’s (Cartesian) acceleration is
-x
+z
-z
+x
-y
+y
18.
1 point
Suppose you lift a 10 kg box off of the floor to a height of 1 m and then carry it across a horizontal floor a distance of 10 m. While transporting the box (the 10 m), how much work does your lifting force do?
98 N
98 J
9.8 J
980 J
0 J
19.
1 point
The rain has stopped. A drain is opened in the bottom of the rolling car allowing the accumulated water to run out. The speed of the car will:
increase
not enough information
decrease
not change
20.
1 point
Three observers, A, B, and C are listening to a moving source of sound. The diagram below shows the location of the wavecrests of the moving source with respect to the three observers. Which of the following is true?
The frequency of the sound is highest at B.
The frequency of the sound is highest at C.
The frequency of the sound is highest at A.
The wavefronts move faster at A than at B and C.
The wavefronts move faster at C than at A and B.
21.
1 point
In pushing the same box diametrically across the circle and back, you would do work 4Fr. In comparing this result to that for part a, you should conclude that
F is conservative
W is path independent
F is non-conservative
W is path dependent
b and c
c and d
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