Sonny took 16 seconds to finish a 100-m race. What was
Sonny's average speed in the race

Answers

Answer 1
Answer:

Speed = Distance/Time

=> Speed = 100m/16s

=> Speed = 6.25m/s

=> Speed = 6.25 ms^-1


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What is the power of 10 when 0.000028 is written in scientific notation

Answers

For this case, the first thing we must do is define the scientific notation.

We have then:

Scientific notation is a way of writing numbers too big or small in a conventional way.

A number written in scientific notation has the following form:

Where,

m: it is called matinsa

e: it is the order of magnitude

Therefore, for the given number we have that the scientific notation is:

Answer:

the power of 10 when 0.000028 is written in scientific notation is:

-5

2.8x10 to the power of -5

Which phrase describes an atom?a positively charged electron cloud surrounding a positively charged nucleus
a positively charged electron cloud surrounding a negatively charged nucleus
a negatively charged electron cloud surrounding a positively charged nucleus
a negatively charged electron cloud surrounding a negatively charged nucleus

Answers

a negatively charged electron cloud surrounding a positively charged nucleus, the third one is the right answer.

Nucleus consists of e
lectrically neutral neutrons and positively charged protons, so it is positively charged. Electrons, on the other hand are negatively charged. Electromagnetic force bounds atoms to the nucleus.

Final answer:

An atom is described as a negatively charged electron cloud surrounding a positively charged nucleus.

Explanation:

An atom is the basic unit of matter, consisting of a nucleus at its center, composed of protons and neutrons, and electrons orbiting the nucleus. It is the fundamental building block of elements, and the arrangement of electrons determines an atom's chemical properties.

An atom is described as a negatively charged electron cloud surrounding a positively charged nucleus. The nucleus of an atom contains positively charged protons and electrically neutral neutrons, while the negatively charged electrons exist in the electron cloud surrounding the nucleus. This model of the atom is known as the Bohr model, which accurately represents the distribution of electrons in an atom.

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Which of the following is an example of measurement bias?a. a scale that reads zero when nothing is on it
b. a stopwatch that stops immediately when the stop button is clicked
c. a balance that always reads .01 g
d. measuring your height in your bare feet

Answers

A scale that reads zero when nothing is on it meansthat the scale reads that there is nothing on it. Statement a is not biased. A stopwatchthat stops immediately when the stop button is clicked means that there is nodelayed reaction of the stopwatch. It corresponds exactly as it is pressed. Statementb is not biased. A balance that always reads 0.01g means that the balance isnot set to zero or it is damaged. If no matter how heavy ythe object is, thebalance reads 0.01g, the measurement is not accurate anymore. Statement c isbiased.

Greyhounds can accelerate at 7 m/s2 at the start of a race. How much force does it take a 35 kg dog to produce this acceleration

Answers


Force = (mass) x (acceleration)              Newton's second law of motion.

Force = (35 kg) x (7 m/s²)  =  245 newtons

                                    (about  55 pounds)

Collect information about working of Geyser and prepare a report

Answers

A geyser is actually a devise that coverts electrical energy into heat energy for heating up water. The heating element that is inside the geyser actually gets heated up and then in turn it heats the water in contact with it within the geyser. There is also a thermostat device within the geyser that cuts off the heating when the water temperature reaches the desired level. This helps in stopping of electrical energy loss. One inlet brings in cold water while another outlet gets rid of the hot water. When the temperature of the water falls below the desired level the heating is again started by the thermostat.



Based on relative bond strengths, classify these reactions as endothermic (energy absorbed) or exothermic (energy released)endothermic
B2+C2-->2BC
A+BC-->AB+C

exothermic
AB+C-->AC+B
A2+C2-->2AC
A2+B2-->2AB

Answers

Exothermic reaction is a chemical reaction that releases energy. This reaction releases heat energy or light .In an endotermic reaction energy is used.Enthaply is the heat energy change , delta H.If the sum of the enthalpies of the reactans is greater than the products the reaction is exothermic. If the products side has a larger enthaply than the process is endothermic. So, if delta H is negative then the process is exothermic. If delta H is positive, than the process is endothermic.Exothermic are: A+BC -> AB+CA2+B2 -> 2ABEndothermic are:AB+C -> AC+BA2 + C2 -> 2ACB2+C2 -> 2BC

Final answer:

Classifying reactions as endothermic or exothermic depends on the comparison of energy required to break bonds in the reactants and energy released when new bonds are formed in products. Bond formation generally releases energy and is exothermic, while bond breaking absorbs energy and is endothermic. Therefore, reactions which make more or stronger bonds (AB+C-->AC+B, A2+C2-->2AC, A2+B2-->2AB) are likely exothermic, whilst those breaking more or stronger bonds (B2+C2-->2BC, A+BC-->AB+C) are likely endothermic.

Explanation:

Chemical reactions can be classified as endothermic if energy (usually in the form of heat) is absorbed from the surroundings, or exothermic if energy is released into the surroundings. The key here lies in understanding the concept of bond energy. Essentially, if more energy is required to break the bonds in the reactants than is released when new bonds are formed in the products, the reaction is endothermic. Conversely, a reaction is exothermic if less energy is required to break the bonds in the reactants than is released when new bonds are formed in the products.

Without exact bond energies, we can only hypothesize about the reactions. However, the general rule is that bond formation is exothermic while bond breaking is endothermic. Therefore, any reaction that results in the formation of more or stronger bonds than it breaks would likely be an exothermic reaction (AB+C-->AC+B, A2+C2-->2AC, A2+B2-->2AB). On the other hand, a reaction that requires breaking more or stronger bonds than it forms (B2+C2-->2BC, A+BC-->AB+C) would likely be endothermic.

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