A man carries a 12-kg chair up one flight of stairs to the second floor of his house. If the second floor is 3.3 m above the first floor, what is the change in the gravitational potential energy of the chair? a - 180 J b + 390 J c + 180 J d - 390 J e zero
Answers
Answer:
Change in gravitational potential energy of the chair is,
Explanation:
It is given that,
Mass of the chair, m = 12 kg
Distance of the second floor from the ground, h = 3.3 m
The position of ground at h = 0
Let is the change in gravitational potential energy of the chair. Initial potential f the chair is equal to 0.
or
So, the change in the gravitational potential energy of the chair is 390 joules.
Final answer:
The change in gravitational potential energy of the chair is +385 J.
Explanation:
The change in gravitational potential energy of the chair can be calculated using the formula ΔPE = mgh, where m is the mass of the chair, g is the acceleration due to gravity, and h is the change in height. In this case, the mass of the chair is 12 kg, the acceleration due to gravity is 9.8 m/s², and the change in height is 3.3 m. Plugging these values into the formula, we get ΔPE = (12 kg)(9.8 m/s²)(3.3 m) = 384.72 J. Therefore, the change in gravitational potential energy of the chair is approximately +385 J.
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B. Neither ultrasonic nor infrasonic vibrations can be heard by humans.
C. Infrasonic vibrations are used in sonar equipment as well as to detect flaws in steel castings.
D. Ultrasonic vibrations have a frequency lower than the range for normal hearing.
Answers
the answer is B, Good luck!
Answers
Answer:
Between 23,000 to 54,000 Hz
Final answer:
A dog whistle typically emits sound at frequencies above 20,000 Hz but below 60,000 Hz, which is a range humans cannot hear but dogs can.
Explanation:
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B. X-rays
C. Ultraviolet
D. Infrared
Answers
Answers
GPE = mgh
where:
m = mass of object
g = gravitational constant, 9.81 m/s^2
h = height
For a given gpe of 20 J, the height can be calculated as follows:
*Remember to be consistent with units. Since Joule is derived from SI units, make sure to use SI units for the other variables
GPE = 20 J = 1 (9.81) (h)
h = 2.04 meters
b. relativistic speeds.
c. both A and B
d. none of the above
Answers
(you are in motion relative to each other, and it doesn't matter
how fast), and you both have clocks, then ...
-- you will say that your clock and your heartbeat are running normally
but his his clock and heartbeat are running slow;
-- he will say that his clock and his heartbeat are running normally
but your clock and heartbeat are running slow.
You'll both be correct.
a technique in which something simultaneously represents itself and something else
a figure of speech that makes a comparison between two objects
words that trigger the imagination to remember by appealing to the five senses
Answers
Correct answer choice is :
D) Words that trigger the imagination to remember by appealing to the five senses
Explanation:
Imagery, in a literary text, is an author's use of clear and expressive voice to add intensity to their work. It advances to human senses to increase the reader's understanding of the work. Powerful forms of imagery involve all of the senses. Basically, there are five types of imagery, each corresponding to one of our senses, visual, auditory, kinesthetic olfactory, and gustatory. The key to good imagery is involving all five senses.
I hope this helps!