1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Fed [463]
2 years ago
5

A sprinter set a high school record in track and field, running 200.0 m in 21.7 s . What is the average speed of the sprinter in

kilometers per hour?
Chemistry
1 answer:
Yuliya22 [10]2 years ago
7 0

Given data:

Distance travelled (d)= 200.0 m

Time taken (t) = 21.7 s

To determine:

The average speed in km/hr

Calculation:

Convert distance from m to km

1000 m = 1 km

200.0 m = 1 km * 200.0 m/1000 m = 0.2 km

Convert time from sec to hours

3600 sec = 1 hour

21.7 sec = 1 hour * 21.7 sec/3600 sec = 6.027 *10^-3 hrs

Speed is defined as the amount of distance travelled per unit time

Speed = distance/time = 0.2 km/6.027*10^-3 hr

           = 33.18 km/hr (or 33.2 km/hr)

You might be interested in
Sasha placed a few objects one by one near a magnet. Only two of the objects Sasha placed moved toward the magnet. Which of the
kirza4 [7]

Answer:

.

Explanation:

5 0
3 years ago
Read 2 more answers
23. Using the periodic table, what is the oxidation number of:
Aloiza [94]

Answer:

a. +2

b. +3

c. -1

Explanation:

The typical oxidation states can be determined from the periodic table based on the number of valence electrons an atom has.

a. Calcium belongs to group 2A, meaning it has 2 valence electrons and, therefore, would have an oxidation state of +2 in compounds.

b. Aluminum is in group 3A, meaning it has 3 valence electrons and would have an oxidation state of +3 in compounds when the 3 electrons are lost.

c. Fluorine would become fluorine if it gained 1 additional electron to achieve an octet, so its oxidation state would be -1.

8 0
3 years ago
Who preformed the oil drop experiment
Ivan

Robert A. Millikan and Harvey Fletcher performed the oil drop experiment.

5 0
2 years ago
Read 2 more answers
19. Contrast mitochondria and chloroplasts. (4 points)
anyanavicka [17]

Answer:

mitochondria are present in the cells of all types of aerobic organisms like plants and animals, whereas Chloroplast is present in green plants and some algae, protists like Euglena. Mitochondria is the colourless, bean shape organelles. Chloroplasts are green colour and disc shape organelles.

Explanation:

3 0
3 years ago
Chemical analysis shows that citric acid contains 37.51% C, 4.20% H, and 58.29% O. What is the empirical formula for citric acid
Fiesta28 [93]

The empirical formula for the citric acid is C₆H₈O₇

<h3>Data obtained from the question </h3>
  • Carbon (C) = 37.51%
  • Hydrogen (H) = 4.20%
  • Oxygen (O) = 58.29%
  • Empirical formula =?

Divide by their molar mass

C = 37.51 / 12 = 3.126

H = 4.2 / 1 = 4.2

O = 58.29 / 16 = 3.643

Divide by the smallest

C = 3.126 / 3.126 = 1

H = 4.2 / 3.126 = 1.34

O = 3.643 / 3.126 = 1.17

Multiply through by 6 to express in whole number

C = 1 × 6 = 6

H = 1.34 × 6 = 8

O = 1.17 × 6 = 7

Thus, the empirical formula for the citric acid is C₆H₈O₇

Learn more about empirical formula:

brainly.com/question/24818135

7 0
2 years ago
Other questions:
  • Is a solution in which (OH) = 1.0 10-1M acidic, basic, or neutral?
    9·1 answer
  • The equation process of fermentation​
    11·2 answers
  • Cyclopropane and propylene isomers both have the formula c3h6. based on the molecular structures shown, which of these isomers w
    5·1 answer
  • Silver sulfadiazine burn-treating cream creates a barrier against bacterial invasion and releases antimicrobial agents directly
    9·1 answer
  • What does frequency describe? A.distance from crest to crest or from trough to trough on a wave B.Number of waves that pass a gi
    7·1 answer
  • Sort the phrases based on whether they describe or give an example of diffusion, facilitated diffusion, both, or neither. note:
    13·1 answer
  • For scientific notation, when i move the decimal to the left the the exponent get bigger or smaller?
    10·1 answer
  • 2HCl → H2 + Cl2<br> Is synthesis?
    7·1 answer
  • A Punnett square is used to _______.
    5·2 answers
  • A man of 450 N covers an area of 0.0015m2 while standing on his feet.calculate the pressure exerted by him on the ground.
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!