Physics 101 Final
what acceleration is produced by a force of 30N acting on a mass of 10Kg?
3 m/s^2
doubles
if the speed of a 25 Hz wave doubles, the wavelength
na
na
refraction and reflection by raindrops
rainbows are due to
in a cycling race, a rider covers the first 50 miles at a constant speed of 21 mph, and covers the second 50 miles at a constant speed of 19 mph. The average speed go the rider for the entire race is.
slightly less than 20 mph
longitudinal
sound waves are _______ waves
if the mass of an object in free fall is doubled, its acceleration
stays the same
because the forces demanded by Newton's third law of motion are equal in magnitude and opposite in direction, how can anything ever be accelerated?
the forces in question act on different bodies
what is the mass of a cart that has an acceleration of 4 m/s^2 when a net force of 2000 N is applied to it?
500 Kg, m = Fnet / acceleration
Al the astronaut has a weight of 800N when he is standing on the surface if Earth. What is the force of gravity acting on him when he in a space station orbiting Earth at a distance of three Earth radii above the surface?
50N
how many hours are required to make a 4400-km trip across the US if you average 80 km/h?
55 h
if a woman walks at a speed of 2 miles/hr for 3 hrs, she will have walked.
6 miles
what is the net force acting on an object which is under the influence of a 5N force acting north and a 5N force acting west?
7 N northwest
A car traveling westward at 20 m/s turns around and travels eastward at 15 m/s. if this takes place in 5s, what is the average acceleration of the car?
7 m/s^2 west
what acceleration is produced by a net force of 100N acting on a mass of 10 Kg if its velocity id 20 m/s and the frictional force is 30N?
7 m/s^2. a = N/Kg
Earths exerts a gravitational force of 7000N on one of the communications satellites. What force does the satellite exert on Earth?
7000 N
id you stand on a spring scale in you bathroom at home, it reads 600N, which means your mass is 60 Kg. if instead you stand on the scale while accelerating at 2 m/s^2 upward in an elevator, what would the scale read?
720 N. Fup = m(a + g)
Al the astronaut has a mass of 90 Kg and a weight of 900N when he is standing in Earth's surface. What is his mass when he is inn a space station orbiting Earth w a radius of three Earth radii?
90 Kg
the strength of gravity on the moon is only 1/6 that on Earth. if an astronaut has a mass of 90 Kg on earth, what would her mass be on the moon?
90 Kg. mass is independent of gravity
converging, 0.2 m
A +5 diopter lens is a ______ lens w a focal length of ______
1/4 Hz
A long pendulum having from the ceiling of the classroom has a period of 4s. What is the frequency of the pendulum?
travels in the direction opposite that of the incident ray.
A ray reflected from a retroreflector
increases
A two-slit interference pattern is produced in a ripple tank. As the two probes are brought closer together, the separation of the locations of maximum amplitude along the far edge of the tank
equal to 440 Hz
A waterproof buzzer has a membrane that vibrates at a constant frequency of 440 Hz. The buzzer is placed in a bucket of water. Knowing that the speed of sound is much greater in awe than in air, the frequency will be
longitudinal
A wave in which the individual particles of a medium vibrate back and forth parallel to the direction the wave travels is called a ________ wave.
stays the same
As the frequencies of two waves get closer together, the beat frequency
higher
Because of the refraction of light in the atmosphere, the apparent portion of a star is usually ____ its true position
2/3
The wavelength corresponding to the third harmonic of a guitar string is ____ times the length of the string.
smaller than
Two standing waves are created on a guitar string. One has a longer wavelength than the other. The frequency of the one w the longer wavelength will be _____ the frequency of the one w the shorter wavelength
Light comes from a real image, it only appears to come from a virtual one
What is the difference between a real image and a virtual image?
Energy
When a sound wave travels from one place to another, what is transported?
energy
When a sound wave travels from one place to another, what is transported?
a point source of light
Which of the following will cast a shadow that has an umbra but no penumbra?
node
Which of the following would you expect to find at the end of a guitar string
0.17 m/s, s = d/t
While standing on a dock, you observe water waves passing beneath you. If you observe 20 wave crests passing's directly below you in 2 minutes and judge the crests to be 1 m apart, what is the speed of the waves?
further from you
You are lying on the bottom of a swimming pool filled w water looking at a balloon suspended over the water. The balloon appears to be ______ it actually is.
100
You go out and spend a buck of money on a new stereo amplifier that advertises that it will be able to produce maximum volumes 20 dB great than your current system. How many more times powerful is this amplifier?
358 Hz
You have a tuning fork of unknown frequency. When you ring it alongside a tuning fork w a known frequency of 360 Hz, you hear beats at a frequency of 2 Hz. When you ring it alongside a tuning fork with a known frequency of 355 Hz, you hear beats at a frequency of 3 Hz. What is the unknown frequency?
5.6 s
a pendulum with a length of 2 m has a period of 2.8 s. What is the period of a pendulum with a length of 8 m?
A solid lead sphere of radius 10(66 ft across) has a mass of about 57 million Kg. if two of these spheres are floating in deep space with their centers 20 m apart, the gravitational attraction between the spheres is only 540N(120 lb). How large would this gravitational force be if the distance between the centers of the two spheres were tippled?
a. 60N
which of the following strobe diagrams does NOT correspond to a situation where the ball is accelerating?
a. equal distances so constant speed
a golfball is thrown vertically upward w a speed of 30 m/s. How long does it take to get to the top of its path?
c. 3s
an object is accelerating
when its speed or direction changes
polarization
which of the following effects occurs for transverse waves but not for longitudinal waves?
which statement best describes the emotion of the ball shown in the strobe diagram below?
c. accelerating. distance at end = 0
Earth is held in orbit by the gravitational force of the sun. Therefore, the force that the sun exerts on earth is ______ that Earth exerts on the sun.
c. the same as
average acceleration of an object is defined to be the
change in its velocity divided by the time it takes.
Two spacecrafts in outer space attract each other w a force of 20N. What would the attractive force be if they were one-half as far apart?
d. 80 N
5 * 10^14 Hz
If red light has a wavelength of 600 nm, its frequency is
are a result of the superposition of two traveling waves
Standing waves
interference
The colors seen in soap bubbles result from
light incident in water at 55 degrees
The critical angle for total internal reflectional at an air-water interference is approximately 48 degrees. In which of the following situations will total internal reflection occur?
different colors have different indices if refraction
The dispersion of light when it passes through a prism shows that
real and inverted
The focal length of a converging lens is 20 cm. The image of an object placed 60 cm from the center of this lens is
half
The focal length of a curved mirror is ______ the radius of the spherical surface.
The frequency of the turbulence due to the steady wind matched the resonant frequency of the bridge.
What caused the Tacoma Narrows Bridge collapse?
cyan
What color would you expect to see if you remove the red light from white light?
-
-
There are three forces acting on an object: 6 N to the left, 5 N to the right, and 3 N to the left. What is the net force acting on the object?
4 N left
if a car changes speed from 40 mph to 48 mph in 2 minutes, its average acceleration is
4 miles/hr/minute
a compressed air potato gun, belt as a project for a physics class, lunches a potato directly upward at a speed of 20 m/s. Neglecting air resistance, how long will the potato be in the air?
4 seconds
The gravitational force between two metal spheres in outer space is 1000N. How large would this force be if each of the two spheres had twice the mass?
4000 N
what is the magnitude of the net force acting on an object which is under the influence of a 3N force acting south and a 4N force acting east?
5 N
what is the acceleration due to Earth's gravity at a distance of 10 Earth radii from earth's center?
0.1 m/s^2
a rock is thrown vertically upward with a speed of 15 m/s. what are its speed and direction 2s later?
5 m/s downward
a ball w a weight of 20N is thrown vertically upward. what is the acceleration of the ball just as it reaches the top of its path?
10 m/s^2 downward
What net force is required to accelerate 20 Kg at 5 m/s^2
100 N, Fnet = ma
a Chevrolet Corvette can accelerate from 0 to 60 in 5.2 seconds. Whats the cars average acceleration?
11.5 mph/s
the gravitational force between two metal sphered in outer space is 2000N. How large would the force be if the two spheres were four times as far apart?
125N
a child traveling 5 m/s on a sled passes her younger brother. if her average acceleration on the sledding hill is 2 m/s^2, how fast is she traveling when she passes her older brother 4 s later?
13 m/s
the strength of gravity on Mars is only 40% of that on Earth. If a child has a mass of 40Kg on Earth, what would the child's weight be on Mars?
160N
a crate has a mass if 24 Kg. what applied force is required to produce an acceleration of 3 m/s^2 if the frictional force is known to be 90N?
162N. ma = F - 90N. solve
an astronaut weighs 900N when measured on the surface of earth. How large would the force of gravity on him be if he were in an earth satellite at an altitude equal to the earth's radius?
225N
if the force of friction on a child'd wagon is 25 N, how much force must be applied to maintain a constant, non zero velocity?
25 N
A car initially traveling westward at 20 m/s has a constant acceleration of 1 m/s^2 westward. How far does the car travel in the first 10 s?
250 m
intensities of the harmonics differ
Even though a guitar and banjo play the same note, they sound different because
7
How many images are formed by two mirrors at 45 degrees to each other?
40 dB
If ear protectors can reduce the sound intensity by a factor of 10,000, by how many decibels can the sound level be reduced?
1.5
If it takes light 5 ns to travel 1 m in an optical cable, what is the index of refraction of the cable?
green, magenta
If the atmosphere primarily scattered green light instead if blue light, the sky would appear ________ and the sun would appear _________
40 m/s
If the fundamental frequency for a 2-m-long rope fixed at both ends is 10 Hz, the speed of the wave is
200 m/s
If the speed of light in a vacuum is 300 million m/s and the index of refraction for light in a piece of glass is 1.5, the speed of light is ____ million m/s
2 miles
If you have to wait 10 seconds between the arrival of the flash and the thunder, you know that the lightning bolt occurred ______ away
iron
In which of the following is the speed of sound the fastest?
spring constant
Increasing which of the following decreases the period of a mass on a spring?
virtual and erect
The focal length of a diverging lens is 20 cm. The image of an object placed 40 cm from the center of this lens is
3
The frequency of the third harmonic on a rope fixed at both ends is _______ times that of the fundamental frequency.
the angle of reflection is equal to the angle of incidence
The law of reflection says that:
you leap from a bridge w a bungee cored tied around your ankles. as you approach the river below, the bungee cord begins to stretch and you begin to slow down. The force of the cord on your ankles to slow you is _____ the force of your ankles on the cord to stretch it.
b. equal to
which of the following strobe diagrams corresponds to the situation where a ball rolled from left to right and continually speeds up?
b. greater distances to smaller ones.
suppose that you look out a tenth-floor window and see a ball falling at 5 m/s. How fast will this ball be falling 2s later?
c. 25 m/s
you decide to launch a ball vertically so that a friend located 45 m above you can catch it. what is the minimum launch speed you can use?
c. 30 m/s
if we use plus and minus signs to indicate the direction of velocity and acceleration, in which of the following situations does the object speed up?
d. negative velocity and negative acceleration.
which of the following is not a vector quantity?
mass
real and inverted
the image formed on the retina of the eye is
Earth's atmosphere scatters more blue light than red
the sky appears blue because:
which of the following is the third law force that accompanies the force that an apple exerts on a tree? it is the force that
the tree exerts on the apple
if an object moves w a constant velocity, we can conclude that
there is no unbalanced(net) force acting on it
In a typical 24 hour day, there are
two high tides and two low tides
