PHYS 108 Final
A grasshopper wiggles his/her legs with a frequency of 3.0 Hz. For the grasshopper creating water waves in Question 1, what is the wave speed in m/s if the waves have a wavelength of 2.0 cm (0.02 m)?
0.06
A grasshopper wiggles his/her legs with a frequency of 3.0 Hz. What is the period of the waves that are created on the surface of the water? Report your numerical value in seconds
0.33
What is the index of refraction of a material in which the speed of light is measured to be 232,000,000 m/s? (The speed of light in vacuum is 300,000,000 m/s)
1.29
A sound wave with a frequency of 260 Hz moves with a velocity of 343 m/s through air. What is the distance from one condensation region (area of maximum pressure) to the next?
1.32
What is the acceleration of a car that moves from a speed 5.0 m/s to a speed of 15 m/s during a time interval of 6.0 s? (Calculate your answer in units of m/s^2, but only submit the number, without units, in the space below)
1.67
A ball is thrown upward with an initial velocity of 15 m/s. Determine the maximum height (in meters) of the ball (from the release point) using energy conservation.
11
If you subtract 3.2 from 14.773, what is your answer (with correct significant figures)?
11.6
A sled and rider are at the top of a hill that is 8 m high. If there is no friction between the sled and the ground, determine the speed of the sled and rider at the bottom of the hill.
12.5
A man pushes a lawnmower with a horizontal force of 100 N. If he pushes for a distance of 12 m and expended 75 W of power, how much time is spent in pushing the mower? Calculate your time in units of seconds, then enter just the numerical value in the blank
16
If you multiplied 9874 by 36, how many significant figures would be in your answer?
2
A cube is measured to have sides of 3.60 cm and a total mass of 147 grams. What is the density of the sample in g/cm3?
3.15
A force of 2.1 N is acting on a 7.0 g rifle bullet. What is the bullet's acceleration (in m/s2)?
300
A light ray strikes a plane mirror with an angle of incidence of 35 degrees. What is the angle of reflection, in degrees, of the light ray as it leaves the mirrored surface?
35
An object is measured to have a net charge of 7.25x10^-17 C. How many excess electrons does this represent?
453.125
If 5000 J of work is used to raise a 102 kg crate to a shelf in a warehouse, how high was the crate raised? (express your answer in units of meters)
5
Convert 300 degrees Celsius to Fahrenheit.
572
A constant net force of 1500 N gives a rocket an acceleration of 2.5 m/s2. What is the mass of the rocket in kg?
600
A 65 kg student runs up a 5.0 m stairway in a time of 3.92 s. How many watts of power did she exert?
819.1
What are the major divisions of physical science (5)?
Astronomy, Geology, Physics, Chemistry, and Meterology
The law that predicts the behavior of electrostatic forces acting through space is
Coulomb's Law
According to Newton's second law of motion, when an object is acted upon by an unbalanced force, what can be said about the acceleration?
It is inversely proportional to the object's mass
To be operational, a complete electric circuit must contain a source of energy (like a battery), a device that does work (like a light bulb) and
a condutor from the source...
Acceleration occurs when an object undergoes... (4 points)
a speed increase a speed decrease a change in the direction of travel both a change in the direction of travel and a change in the speed (increase or decrease)
What is a possible state of an object in the absence of a net force (3 points)?
at rest zero acceleration constant speed
Aluminum has a specific heat capacity more than twice that of copper. Place equal masses of aluminum and copper wire in a flame and the one to undergo the fastest increase in temperature will be
copper
The unit of electric charge is the
coulomb
A material that has electrons that are free to move throughout the material is a(n)
electrical conductor
A clerk can lift containers a vertical distance of 1 m or can roll them up a 2 m long ramp to the same elevation. With the ramp, the applied force required is about
half as much
Compared to a giant iceberg, a hot cup of coffee has
higher temperature but less thermal energy
Select the four metric prefixes that are most commonly used
milli-, kilo-, centi-, and mega-
If you multiply volts by amps, the answer will have units of
power
A parallel circuit has
seperate
A ball rolling across the floor slows to a stop because
there is a nonzero net force acting on it
According to Ohm's Law, what must be greater to maintain the same current in a conductor with if the resistance increases
voltage
