1. The primary of a step-up transformer connected to a 120 V source has 200 turns. If the output is 480
V, how many turns does the secondary have?
480/120=x/200x= 800turns
2. The primary of a step-down transformer connected to a 240 V source has 1000 tur
Question 1 (1 point)
If an object falls with constant acceleration, the velocity of the object must
Question 1 options:
continually change by varying amounts, depending on its speed.
be constant also.
continually decrease.
continually change by the same a
1. An automobile traveling at 25 km/hour has kinetic energy equal to 1 x 10 4J.
a. What is the mass of the car?
Speed = 25 km/hr = 6.94 m/s
Kinetic Energy = 0.5mv2
1 x 104 = 0.5m6.942
m = 415.25 kg
b. If the velocity of the car is increased to 45 km/hour,
Question 1 (1 point)
When the distance between two stars decreases by half, the force between them
Question 1 options:
stays the same.
decreases by one-half.
increases to four times as much.
increases to twice as much.
decreases by one-quarter.
Save
Quest
In this exercise, you will measure the diameters and circumferences of several circles to see what kind of
proportion is observed. To do this you will need six glasses, cups, or other circular containers of different
sizes.
For part 3 you will need to hig
Question 1 (1 point)
To change 50 g of boiling water to steam requires
Question 1 options:
50 calories.
more calories than is required to bring 50 g of ice at absolute zero to the boiling point.
500 calories
540 calories.
none of the above
Save
Question 2
Question 1 (1 point)
When a bimetallic bar composed of copper and iron strips is heated, the bar bends toward
the iron strip because
Question 1 options:
iron gets hotter before copper.
iron expands more than copper.
copper gets hotter before iron.
copper
Laboratory-Exercise 2
1.
Convert 500 km to inches.
a. 500km X cfw_3280.84 X cfw_12 inches = 19,685,040 inches
2.
Convert 1 day to hours, then to minutes, then to seconds.
a. 1 day = 24 hours
b. 24 hours = 1,440 minutes (24 * 60)
c. 24 hours = 86,400 secon
All matter can exist in three phases: solid, liquid, or vapor. Read the material in the material in the
section Heat and Phase Transition and then answer the following:
1. How many calories of heat are required to change 1 gram of ice at 0C to liquid wate
1. In a simple circuit a 6-volt dry cell pushes charge through a single lamp which has a resistance of
3 . According to Ohms law the current through the circuit is _2_ Amps.
2. If a second identical lamp is connected in series, the 6-volt battery must pus
Question 1 (1 point)
The power expended for a barbell raised 2.0 m in 2 s is
4 W.
8 W.
1 W.
not enough information
Question 2 (1 point)
A 4-kg ball has a momentum of 12 kgm/s. What is the ball's speed?
48 m/s
12 m/s
4 m/s
3 m/s
none of the above
Question
Know that luminous objects can be seen from the light that they emit and nonluminous
objects can be seen from the light that they reflect.
Know that when light encounters matter, the light may be reflected, absorbed or transmitted.
Know that when a ray
Quiz #3 cfw_ Review
1. Be able to solve simple problems involving free-falling bodies in a
gravitational field.
2. Be able to list the four types of Fundamental Forces in the Universe:
Gravity, The Electromagnetic Force, The Strong Nuclear Force, The Weak
Quiz #2 Review
Be able to perform unit conversions (base and derived).
Be able to rearrange a formula to solve for the indicated variable.
Be able to convert decimal numbers to scientific notation and vice versa.
Be able to define scalar and vector qu
1. Be able to describe what an element is and provide at least three examples. A pure substance that
cannot be decomposed into similar substances by chemical or physical means. Hydrogen-H,
Aluminum-Al, Helium-He
2. Be able to describe what a compound is a
Physical Science 1010 Sec. A02/A41 (Fall 2015)
Exam #2 Review
Know the items from Quiz #4 Review.
Know the items from Quiz #5 Review.
Know the charge associated with each subatomic particle.
Know how charges interact with one another (like repels like
1. Define: Accuracy-Measurement that is measured true to its value.
Precision-Degree to which a series of measurements or calculations are to one another.
2. Basic steps for scientific method: 1) What will happen 2) Form a Hypothesis Develop
experiment to