What is BEST to say about a runner who is running at a constant velocity? A. Their acceleration is positive. B. Their acceleration is negative. C. Their acceleration is zero. D. Their acceleration cannot be determined.

Answers

Answer 1

Answer: The question is asking us what is BEST to say about a runner who is running at a constant velocity? A constant velocity (=speed) means that they are not getting faster or slower - they are running exactly as fast all the time. This meanst that their speed does not change, so their change of speed is equal to 0. A change of speed is called acceleration so their C. Their acceleration is zero. - C is the correct answer.

Answer 2

Answer:

the correct answer is C.

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a train is moving at 4.0 km/h. It accelerates at 60 km/h/s for 0.75 h. What is its speed by the of the 0.75 h

Answers

Answer:

49 km/h

Explanation:

60 km/h acceleration for 0.75 hours.

60 × 3/4 = 45 km/h

Take the acceleration and add it to the speed the train was already moving at:

45 + 4 = 49km/h

Why do we insulate houses?A. To prevent heat transfer from inside to
the outside
B. To allow energy to flow from inside to
the outside
C. To keep them cool in the winter and
warm in the summer

Answers

B to allow energy to flow from inside to the outside

Which of the following is not a natural source of light?a. The sun
b. Fluorescence
c. Phosphorescence
d. Oil lamps

Answers

So we want to know which is not natural source of light. Sun is the natural source of light. Flourescence, oil lamps and phosporescence are all mechanisms of creating light that are artificial and made by people. So the correct answer is b. c. and d.

Penn Foster STudents: Oil Lamps

Assuming that all carts are moving, compare and contrast the differences in the motion of the 3 carts.

Answers

To compare and contrast the differences in the motion of three carts, it's essential to consider various aspects of their motion, including speed, direction, and acceleration. Without specific details about the motion of each cart, I can provide a general framework:

Comparison:
1. Speed: You can compare the speeds of the carts to determine which one is moving the fastest and which one is the slowest.
2. Direction: Compare the directions in which the carts are moving. Are they all moving in the same direction, or are some moving in opposite directions?
3. Acceleration: Consider if any of the carts are accelerating (changing their speed) and in which direction.

Contrast:
1. Speed: Highlight the differences in speed between the carts. For example, Cart A may be moving slowly, while Cart B is moving quickly.
2. Direction: Discuss any differences in direction. Are some carts moving forward while others are moving backward or in different angles?
3. Acceleration: Note if any of the carts are accelerating differently. For instance, Cart C might be accelerating rapidly while Cart A maintains a constant speed.

To provide a more detailed comparison and contrast, it would be helpful to have specific information about the motion of each cart, such as their speeds, directions, and accelerations.

C12H22O11 + 11H2SO4 12C + 11H2SO4 + 11H2OHow do you know the concentrated sulfuric acid is a catalyst?

Answers

By looking at the equation
C12H22O11 + 11H2SO4 12C + 11H2SO4 + 11H2O
we can conclude that the concentrated sulfuric acid is a catalyst because
the sulfuric acid doesn't react with the reactant and it is not consumed.

Hope this helps! If you have any other questions or would like further explanation just let me know!! :)

Answer:no

Explanation:

A wave has a speed of 23 m/s and a frequency of 13 Hz. What is the wavelength?

Answers

Answer:

1.76923077 meters

Explanation:

wavelength is denoted by the letter lambda it is equal to the speed (v) of a wave in a medium (air , water, light) divided by frequency , equals wavelength . so wavelength = v/f or = 23m/s ÷13hz

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