Physics Exam 1
You would like to know whether silicon will float in mercury and you know that can determine this based on their densities. Unfortunately, you have the density of mercury in units of kilogram/meter^3 and the density of silicon in other units: 2.33 gram/centimeter^3. You decide to convert the density of silicon into units of kilogram/meter^3 to perform the comparison. By which combination of conversion factors will you multiply 2.33 gram/centimeter^3 to perform the unit conversion?
1 kilogram/10^3 gram X 1 centimeter/10^-2 meter X 1 centimeter/10^-2 meter X 1 centimeter/10^-2 meter
If a stone falls to the bottom of a mineshaft in 6 seconds, then the depth of the shaft is about
180 m
In an experiment you are performing, your lab partner has measured the distance a cart has traveled: 28.4 inches. You need the distance in units of centimeters and you know the unit equality 1 inch= 2.54 centimeter. By which conversion factor will you multiply 28.4 inch in order to perform the unit conversion?
2.54 centimeter/ 1 inch
In its first second of free fall, a dropped softball will fall a vertical distance of
5 m.
What relationship between distance traveled and time did Galileo discover for freely falling objects released from rest?
Galileo discovered that distance increased as the time squared.
What was the greatest discovery by Galileo during his inclined-plane experiments?
He discovered that a ball rolling down an incline and onto a horizontal surface would roll indefinitely.
Consider the video demonstration that you just watched. Which of the following changes would make it more likely for the ball to hit both the white can and the green can?
None of the above.
Psychological comfort is a benefit of having solid answers to religious questions. What benefit accompanies a position of not knowing the answers?
Not knowing answers opens the mind to a lifetime of exploring.
A car by itself is capable of a certain maximum acceleration. When it tows a twice-as-massive car, its maximum acceleration is
One half
Which of these is the most basic science?
Physics
Which is normally greater: static friction or sliding friction on the same object?
Static friction is normally greater than dynamic friction.
Why did Aristarchus choose the time of a half moon to make his measurements for calculating the Earth-Sun distance?
The Earth, Moon, and Sun formed a right triangle at that time.
The brakes of a speeding truck are slammed on and it skids to a stop. If the truck were heavily loaded so that it had twice the total mass, the skidding distance would be
The same
What is the net force on a crate sliding at an unchanging speed when pushed with a steady force of 75 N?
Zero
A student solving for the acceleration of an object has applied appropriate physics principles and obtained the expression a=a1 + F/m where a1=3.00 meter/second^2, F=12.0 kilogramX meter/second^2 and m= 7.00 kilogram. First, which of the following is the correct step for obtaining a common denominator for the two fraction in the expression in solving for a?
a= (m/m X a1/1) + (1/1 X F/m)
Imagine you derive the following expression by analyzing the physics of a particular system, a= g sin 0 - Ukg cos 0, where g= 9.80 meter/second^2. Simplify the expression for a by pulling out the common factor.
a= g(sin 0 - Uk cos 0)
Technology is a tool for
applying scientific discoveries.
The force that causes Earth to orbit the Sun is due to gravity, while the force needed to keep Earth moving as it circles the Sun is
no force at all.
Inertia is defined as a
property of matter
A ball rolling down an inclined plane each second picks up
the same amount of speed each second.
A scientific hypothesis deemed valid must have a test for proving it ___________
wrong.
