PHYSICS HIGH SCHOOL

Which of the following is an example of a decomposition reaction?a. photosynthesis
b. digestion
c. polymerization
d. exchange of ions between two compounds

Answers

Answer 1
Answer: The answer is (b) digestion.
A decomposition reaction is a process in which a single compound breaks into two or multiple elements or compounds. A best example is digestion where a large insoluble food molecules breakdowns into small water-soluble molecules so that they can be absorbed into the watery blood plasma.

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What temperature is required to transfer waste heat to the environment for a heat engine to be 100 percent efficient?
Aspace walking astronaut has become detached from her spaceship! She’s floating in space with her handy tool belt attached to her waist, thinking about how she might get back to the ship, which she can see 50m from her current location. How can she get back to the ship? Use the language from the laws of motion in your answer.What can she do with the tool belt? What will that action cause her body to do? Why? Which of Newton’s Laws applies to this situation? Write a paragraph which incorporates all of the above information.
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Which of the following represents units of geologic time in increasing order?A. Eon, era, period, epoch
B. Epoch, period, eon, era
C. Era, eon, period, epoch
D. Epoch, period, era, eon

Answers

Answer:

D. Epoch, period, era, eon

Explanation:

An eon refers to the largest division of time in Earth's history used on the geological time scale. The current eon is divided into three eras. the current era is divided into three periods and the current period is divided into two epochs, reaching the Holocene, which is the current geological epoch.

B. is the correct answer.

two pendulums of lengths 100cm and 110.25cm start oscillating in phase. after how many oscillations will they again be in same phase?

Answers

Angular frequency of pendulum is given by

\omega = \sqrt{(g)/(l)}

for both pendulum we have

\omega_1 = \sqrt{(9.81)/(1.00)}

\omega_1 = 3.13 rad/s

For other pendulum

\omega_2 = \sqrt{(9.81)/(1.1025)}

\omega_2 = 2.98 rad/s

now we have relate angular frequency given as

[tex\omega_1 - \omega_2 = 3.13 - 2.98 = 0.15 rad/s[/tex]

now time taken to become in phase again is given as

t = (2\pi)/(\omega_1 - \omega_2)

t = (2\pi)/(0.15) = 41.88 s

now number of oscillations complete in above time

N = (t)/((2\pi)/(\omega_1))

N = (41.88)/((2\pi)/(3.13))

N = 21 oscillation

A focal arrangement that has a thin lens that the light passes through before traveling down the tube to the objective mirror is a _______________.a. Cassegrain focus
b. Newtonian focus
c. Schmidt-Cassegrain focus
d. Schmidt focus

Answers

The correct answer for the question that is being presented above is this one: "Schmidt-Cassegrain focus." A focal arrangement that has a thin lens that the light passes through before traveling down the tube to the objective mirror is a Schmidt-Cassegrain focus.
Here are the following choices: 
a. Cassegrain focus
b. Newtonian focus
c. Schmidt-Cassegrain focus
d. Schmidt focus

Middle c has a speed of 1500 m/s in water and 340 m/s in air. does it have a longer or shorter wavelength in water than in air and why?

Answers

yes, it has a longer wavelength in water than in air.

Which would be an example of biopsychology?                                                                 A.A psychiatrist prescribes medication for depression.                                                      B.A psychiatrist asks the patient how he deals with conflict.                                             C.A psychiatrist has the patient do a journal about his experiences.                                   D.A psychiatrist has the patient tell him about his childhood.

Answers

Answer:

Psychiatrist prescribes medication for depression.

Explanation:

took the question

Answer:

A psychiatrist prescribes medication for depression.

What is the difference between the fields surrounding a stationary charge and those that surround a moving charge? A moving charge has only an electric field and a stationary charge has only a magnetic field. A moving charge has both an electric and magnetic field and a stationary charge has only an electric field. A moving charge has only a magnetic field and a stationary charge has both an electric and a magnetic field. There is no difference between the fields surrounding a stationary charge and those that surround a moving charge—both have an electric and a magnetic field.

Answers

The best statement would be the second option where a moving charge has both an electric and magnetic field and a stationary charge has only an electric field. A charged particle that is stationary produces a magnetic field but does not produce electric field. A periodically moving charge, on the other hand produces an electro-magnetic field.

The correct answer to the question is : B) A moving charge has both an electric and magnetic field, and a stationary charge has only an electric field.

EXPLANATION :

Before answering this question, first we have to understand the nature of field created by charge particles.

If the charge particle is at rest i.e stationary, then the field created by the charge particle is electric in nature. Hence, a stationary charge particle produces electric field only.

If a charge particle moves with uniform velocity, then the field will be only magnetic .Hence, a non accelerating charge particle will produce magnetic field.

If a charge particle accelerates, then the field created by the charge particle is electromagnetic in nature.

Hence, the correct answer of this question is the second statement.
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