Question 2 (2 points)
Practice tests are available online.
True
False
K12

Which statement describes an example of static electricity?
O A. When a light switch is flipped, electrons flow to a lightbulb.
O B. Positively and negatively charged particles are attracted to each
other.
O C. Wind turns a generator, causing electrons to flow into power lines.
O D. Electrons move from one end of a copper wire to another.

2. hlep ={

Which of these are examples of negative tropism? (Select all that apply.)

a plant’s stem growing upward out of the ground due to gravitropism

a plant’s leaves growing away from the sunlight due to phototropism

a plant’s roots growing toward a water source due to hydrotropism

a plant’s roots growing away from a water source due to hydrotropism

a plant’s leaves growing toward the direction of the sun due to phototropism

a plant’s roots growing down into the soil due to gravitropism

A car travels 200km. The trip takes 4 hours. The highest speed the car travels at is 100Km/h and lowest speed is 45km/h. Calculate the average speed of the trip?

Transfer of heat through conduction can occur in which of the following?
A. Solids

B. Liquids

C. Gases

D. All of the above

Plz Help me with this ?

Lab Report: Reaction Rates and Temperature

In this activity, you will complete a virtual experiment to determine how the temperature of water affects the time it takes for antacid tablets to dissolve.
Pre-lab Questions
1. How does an increase in concentration affect a chemical reaction?
2. When temperature increases, what happens to the molecules in a chemical reaction?
3. How do we measure the average kinetic motion of molecules in a solution?
Hypothesis Before you begin your lab, write a hypothesis that reflects how you think temperature of the water will affect the reaction rates. Record your hypothesis as an “if, then” statement.
Variables
This experiment tests how the temperature of water affects the time it takes for antacid tablets to dissolve.
1. What is the independent variable?
2. What is the dependent variable?
Materials
Note that you may choose to conduct this lab with the materials listed below (follow all lab safety procedures) or by watching the experiment video in the lesson.
• 4 antacid tablets
• 2 clear cups labeled Hot and Cold
• Water
• Timing device
Procedure
• Observe the experiment in the virtual lab window. (Or, if you choose to perform this experiment yourself, follow the same procedures shown in the video.)
• Record the time for each trial of the experiment.
Data
Data table: Record the length of time for each trial.
Trial
Time for tablet to dissolve in hot water
Time for tablet to dissolve in cold water
1


2




Graph
Create and include a graph to show the results from the trials. You may use the Create A Graph tool located in the course toolkit for help creating a graph.

Post-Lab Questions
1. Review your data. Did your experiment support your hypothesis? Support your answer with data from your experiment.
2. How did the temperature affect the time it took for the antacid tablet to dissolve?
3. What evidence indicates that a chemical reaction took place?
4. Predict what would happen if the same experiment was conducted with different amounts of water.

Two identical cars are parked in the sun on a warm day. One car is black and the other is white. Both cars are parked for three hours. Explain whether there is any temperature difference inside the black car and the white car after 3 hours.

If a liquid is heated and the temperature at which it boils is measured, the _____ property is being measured.

molecular

atomic

chemical

physical

Vector A→ has a magnitude of 8 units and makes an angle of 45° with the positive x-axis. Vector B→ also has a magnitude of 8 units and is directed along the negative x-axis. Using graphical methods, find (a) the vector sum A→ + B→ and (b) the vector difference A→ - B→

Electric field lines point from positive charges to negative charges. A. True B. False​

When methane is burned it interacts with oxygen to form carbon dioxide and water vapor. Which of the following is the word chemical equation for this reaction?

Group of answer choices

oxygen + carbon dioxide -> methane + water

methane + oxygen -> carbon dioxide + water.

methane + carbon dioxide -> water + oxygen.

dioxide + carbon -> methane oxygen + water.

Referring to the above diagram, how high will the ball rise on the right-hand incline?
0 cm
7 cm
15 cm
no way to tell

A wave on a string is observed to have a frequency of 3 Hertz. Its wavelength is 6 centimeters.

What is its wave speed?

Is this right?

Meryl is making a collage of pictures for her science class. On one-half of a piece of poster board, she is attaching pictures of the result of adding heat to materials. On the other side of the poster, she is attaching pictures of the result for removing heat from materials. Which of the following pictures should be placed on the side of heat being removed from the material?


a frozen popsicle

baked cupcakes

steam from a pot

melted candy bar

A meteor falls toward Earth's surface. Given that the acceleration due to
gravity is 9.8 m/s^2, what is the meteor's potential energy if it has a mass of 10
kg at an altitude of 400 m?
O A. 408 J
O B. 7,840,000 J
O C. 2J
O D. 39,200 J

Which effect is created when two sound waves that are close in pitch
interact?
O A. Echoes
O B. Loudness
C. Beats
O D. Intensity

Matthew and his dad are walking along the beach. Matthew runs toward the water and dips his hands in the cool ocean. Then, he walks back to his dad and grabs his hand. “Matthew, your hands are so cold now!” his dad exclaims. Where did conduction occur during this scenario?
A. between Matthew’s warmer body and his now cooler hand
B. between Matthew’s hand and his father’s hand
C. between Matthew’s warm hand and the cool water
D. between Matthew's father's hand and the cooler water

Which of these would have the highest temperature?

A. ice
B. water
C. water vapor

Match the numbers to the answer below

help me pls i need the answer

Write a report on waves. Some questions you might consider are: What makes a wave? Why are some waves small and some large? How are waves classified? Are there different kinds of waves? What happens when a wave meets the shore? Where in the world do you find the best waves for surfing?

Where does groundwater come from?

Stratus clouds, like the ones shown in the picture, look like large gray blankets hanging low across the sky. When these are present, it will usually ____ if it is warm, and ____ if it is cold.

1. rain, snow
2. snow, drizzle
3. drizzle, be windy
4. be windy, be sunny

1. In Physics, we distinguish between wave motion and particle motion Wave motion
refers to the movement of a wave-like pattern from one location on the medium to
another. When you view a water wave moving along the surface of water, you are
observing wave motion. There is a very obvious movement of a collection of crests and
troughs along the water surface. In the Simple Wave Simulator, there is a collection of
crests and troughs moving through a rope this is wave motion. But there are also three
points on the rope that are colored red. When you observe the motion of these points.
you are observing particle motion - the motion of particles of the rope. Describe the
motion of these particles.​

100 POINTS AND BRAINLIEST NO CAP IF YOU WRITE THIS CORRECTLY AND DECENTLY IF YOU HAVE A QUESTION PUT IT IN THE COMMENTS NOT AN ANSWER PLS
You have learned that power is the speed, or rate of doing work. In this report you will learn more about James Watt or horsepower.

Here is your goal for this assignment:

Complete an activity on power


Complete one of these activities:

1. Research the life of James Watt. Report in about fifty words some of the important events in Watt's life leading up to the watt being named in his honor.

2. Conduct a survey of equipment and cars to find out the amount of horsepower of each item you check. You may visit a car dealer, an appliance store, a heavy-equipment dealer. Make a list of the horsepower of at least ten items of equipment. Some suggestions include: comparing two or three different makes of cars or finding the horsepower of a lawn mower, boat, vacuum cleaner, or some heavy equipment for moving dirt. You may find that the power of a washing machine or vacuum cleaner is given in watts instead of horsepower. Make a chart to record your findings, including:

Type of Equipment Surveyed: (Indicate whether it is a car, shovel, vacuum cleaner, etc.)

Amount of Horsepower or Watts: (Record power in horsepower or in watts.)

I need help with question ii) Calculate the speed of these radio waves.
I don't know if I started it right.... I need help plss!!!

Someone places a spoon in hot water. The spoon remains in the water till the water becomes room temperature, what temperature is the spoon handle?

Describe 3 factors an engineer should take into consideration when choosing material for building the pipes in a pipeline

Gr. 8
Think it has something to do with Viscosity, Density, and Pressure but not sure what

Earth's atmosphere is composed of
A.
iron, oxygen, and silicon.
B.
nitrogen, oxygen, and trace amounts of other gases.
C.
water, liquid oxygen, and trace amounts of other liquids.
D.
carbon dioxide, ozone, and magnesium.

Here, if you help me ill give you 100 points and brainlyist. This is worth way less than 100 points, but im a awesome person :D

Earth rotates on its tilted axis _______________ an Earth day.
The moon rotates on its axis approximately once per _____________.
The moon orbits Earth approximately once a ____________________.
Earth-moon system orbits the sun once a _______________________.
Solar energy _____________ off the side of the moon that faces the sun and can travel to Earth.
Solar energy travels in a straight line from the sun and hits different parts of the curved Earth at different ___________ - more direct at the __________________ and less direct at the ________________.