PHYS 101 Final Exam
Ben leaves his home and walks to the bank, then back home in a total of 30 minutes. What is his displacement? Look at #90
0 blocks
Using a pedometer, you walk 3000 steps in 20 minutes, so your speed is 150 steps/min. Each of your steps is 0.7 m long. What is your speed? 1 hour is 3600 seconds, 1 minute is 60 seconds
105 meters per min
How much force is needed to accelerate a 5kg skateboard at 5m/s2 .
25 N
Calculate the total resistance of the circuit Look at #44
30 Ω
Which wave in the diagram has the greatest frequency? Look at #87
4
If a dog pulls a 15 kg bike with a force of 60N, how quickly did it accelerate?
4 m/s2
Calculate the total resistance of the circuit Look at #42
60 Ω
If your mass on Earth is 75 kg then your mass on the moon would be
75 kg
A truck and a trailer weigh 4000 kg EACH. In order to accelerate at 2 m/s2 , how much force would need to be produced?
8,000 Newtons
Which of the following answers is closest to the weight (on the Earth's surface) of a woman whose mass is 80kg? consider gravitational acceleration as ~ 10 m/s2
800 N
Consider the electric field lines shown in the diagram below. From the diagram, it is apparent that object A is ____ and object B is ____.
A = - and B = +
If a substance has a higher number of electrons than protons on its surface, what type of charge does it have?
A negative charge.
Speed is
A scalar quantity
Velocity is
A vector quantity
Electric currents are measured in...?
Amperes
What property of the wave is represented by the letter "B"?
Amplitude
An electron in a calcium atom gains enough energy to move from the first shell to the second shell. The calcium atom becomes
An atom in an excited state
In the classroom demonstration Samantha stands on a freely spinning lab stool that has no friction in its axle. When Samantha extends her arms,
Angular momentum is conserved, her moment of inertia increases and her angular speed decreases.
Which statement is a true statements
none of the above
The speed of light in glass is
smaller than the speed of light in water
What is the difference between distance and displacement?
Displacement is a vector and distance is a scalar
The velocity of a body is given by the slope of a graph plotting
Displacement versus time.
In people who are nearsighted the lens in their eye focuses the image in front of the retina. Do nearsighted people need glasses with converging lenses or diverging lenses?
Diverging
Which of the circuits shown will cause the light bulb to light up? Look at #48
E only
Magnetic fields are made by...?
Electric Currents
What kind of magnet can be turned on and off?
Electromagnet
The point where rays intersect when leaving the lens, if they were traveling parallel to the axis when they entered the lens, is called the
Focal point
If you want to increase the acceleration of a baseball when you throw it, what must you increase to make this happen?
Force
If the wavelength of an electromagnetic wave is about the atomic nuclei, what type of radiation is it?
Gamma ray
The north pole of Earth's magnet is in the:
Geographical North
The highest point on a wave is:
The crest
What are positrons? When an electron and a positron meet they annihilate to produce
antimatter of electron, gamma rays
Given this schematic diagram of a defective eyeball, Which of the lenses shown can correct this defect? Look at #62
c and d
Hermione wears glasses, her friend complained that her eyes look larger than they actually are. Those glasses are
for correcting farsightedness.
Superconducting materials only work correctly when they are really cold. What is the best temperature to install superconducting materials?
-269 degrees Celsius
A car is moving on a highway with a speed of 100 m/s. Two seconds later the car is moving at 10 m/s in the same direction. The car's acceleration is
-45 m/s2
Calculate the total resistance of the circuit Look at #43
120 Ω
A solid metal bar is at rest on a horizontal frictionless surface. It is free to rotate about a vertical axis at the left end. The figures show forces of different magnitudes that are exerted on the bar at different locations. In which case does the bar's angular speed about the axis increase at the fastest rate?
Answer is A, Higher the torque higher the speed.
Which of the following diagrams correctly shows the magnetic field produced by a current-carrying wire, current direction is from top to bottom? Look at #47
Answer is d. Use right hand rule.
Protons
Are positively charged particles
A ball is thrown straight up. It reaches its highest point and then falls back. Which of the following is the correct statement?
At the highest point in its motion, the ball's velocity is zero.
Magnetic poles that are unlike ________ and magnetic poles that are alike ___________.
Attract; repel
What is this symbol for? Look at #51
Battery
Why do objects experience centripetal acceleration?
Because they are constantly changing direction and the net change is directed inward
Objects mechanical equilibrium occurs when,
Both A and B have to be satisfied by the object
What factors might your doctor consider when deciding whether to use X-rays on you?
Both answers are correct.
Although the effects of X-ray radiation can be harmful, what else can they do?
Both are correct.
At which point is the electric field is zero look at final exam review #29
C
To save on electricity and eliminate heat in the kitchen, you would like to build a solar cooker. Which type of mirror would work best?
Concave
What type lens is used to correct nearsightedness?
Concave
What type lens is this? Look at #57
Convex
What type of lens is a Magnifying Glass?
Convex
When you look at the speedometer in a moving car, you can see the car's
Instantaneous speed.
What's the most vital function of Earth's magnetic field?
It deflects most of the solar wind
Which material stops X-rays dead in their tracks, preventing unnecessary exposure to radiation?
Lead
There are several modern uses of magnets. Magnets allow high speed trains to ______________________ above the track. They go faster because without touching the tracks there is no friction to slow them down
Levitate
Electrical energy is changed to ______________ in light bulbs.
Light Energy
Which of the following technique doesn't put anything into a patient's body....No X rays/Strong Magnetic Fields/Radio waves/Radio-tracers ?
MEG
Which scanner is best match with people suffer from claustrophobics
MRI
A compass behaves as it does because each needle acts as a(n) ___________.
Magnet
A _____ uses only one convex lenses to magnify an object and make a smaller object larger.
Magnifier
Insulator is?
Material that current cannot pass through easily
Earth's magnetic field is formed mostly by:
Molten iron in the earth center
When one bulb in a series circuit containing several light bulbs burn out:
None of the other bulbs will light up
Which correctly represents the orientation of the electric field, magnetic field, and direction of propagation for an EM wave?
None of these
When we turn the switch to the off position the circuit is __________.
Open
What types of imaging techniques do not expose people to X-ray radiation?
PET, MRI and MEG scanners
What types of charges attract?
Positive and Negative
According to Newton's second law of motion, acceleration is proportional to force. That means a smaller force
Produces a smaller acceleration
Which has a lower frequency than visible light?
Radio Waves
An image formed with a lens, that can't be projected onto a screen, is called a _____ image.
Real
Lenses_____ light rays to make an image.
Refract
A ball rolls in a straight line along the horizontal direction. Using motion diagram (multi-flash photographs) describe the velocity and acceleration of the ball for each of the following situations:
The ball moves to the right at a constant speed
A book is sitting on a desktop. Identify the 3rd law partner of the weight of the book.
The force of the book on the earth
The center of mass is:
The point at which you can balance with one finger
Why does each electron in an atom behave like a tiny magnet?
The spinning off an electron produces a magnetic field.
What gives X-rays their name?
They are called X -rays because they were unknown to scientists at the time.
What happens when an X-ray beam is turned off?
Turning an X-ray machine off leaves the area free of radiation
What does the following represent? ⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗ ⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗ ⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗
Uniform magnetic field directed into the screen away from you
What does the following represent? ⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙ ⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙ ⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙
Uniform magnetic field directed out of your screen at you
Which of the following statements about velocity and/or speed are TRUE?
Velocity is a vector quantity and speed is a scalar quantity
Which is the color from the visible spectrum produced by waves of the smallest wavelength?
Violet
The scientific method is
Ways scientists answer questions and solve problems
If an object scatters light in all wavelengths, what color does it appear to be?
White
Which statement is a true statement
X rays are made of the same "stuff" as visible light. They are both forms of "electromagnetic radiation".
An ice skater standing still on a frozen pond. What is the net force acting on the skater?
Zero
Two people pull on a rope in a tug-of-war. Each pull with 200 N of force. What is the net tension in the rope
Zero
What are the properties of visible light waves?
a, b and c
Advantages of basic X ray imaging
a, b and c but not d
Photons are
uncharged, particle-like bundles of energy