PHYSICS HIGH SCHOOL

HELP NEEDED! Determine the mechanical energy of this object: a 1-kg ball rolls on the ground at 2 m/s. A. The ball is on the ground, so the mechanical energy is zero.
B. 2 J
C. 1 J
D. 4 J

Answers

Answer 1
Answer: The mechanical energy of an object is the sum of its potential and kinetic energy.

Because the ball is on the ground, its potential energy is 0.
Its kinetic energy is given by:

K.E = 1/2 mv²
K.E = 1/2 x 1 x 2²
K.E = 2 J

Mechanical energy = 2 + 0
Mechanical energy = 2 J

The answer is B.
Answer 2
Answer: I think it's 2 J. Hope I helped :)

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1. When a motor is turned on, electrical energy is transformed to mechanical energy plus heat energy.True or False

2. The outward evidence for this transformation can be seen only in the mechanical motion of the motor.
True or False

3. What is true of the efficiency of this motor?
a. it is more than 100% efficient
b. it is 100% efficient
c. it is less than 100% efficient
d. none of the above

Answers

1.) The statement is true!... heat energy is also generated due to the presence of resistance in motor. Heat generated is given by, H=i²Rt( i = current, R is the resistance of the conductor and t is time). 2.) This statement is false because transformation takes place in electrical motor too due to presence of resistance. 3.) c.  it is less than 100% efficient. 

Answer:

1. True

2. False

3. c. it is less than 100% efficient

500.0 g of acetone is heated from –100.0 °C to 60 °C. How much heat (in kJ to two decimal places) is required for this process

Answers

Answer: The amount of heat required for this process is 172.5 kJ.

How do the dark lines of an atom''s absorption spectrum relate to the bright lines of its emission spectrum?a. The bright lines are at the same energies as the dark lines.
b. The dark lines are at higher energies than the bright lines.
c. The bright lines are at higher energies than the dark lines.
d. You cannot relate the two types of spectra.

Answers


Wouldn't it be neat if an electron falling closer to the nucleus ... emitting a
photon ... actually gave out more energy than it needed to climb to its original
energy level by absorbing a photon !   If there were some miraculous substance
that could do that, we'd have it made.

All we'd need is a pile of it in our basement, with a bright light bulb over the pile,
connected to a tiny hand-crank generator.

Whenever we wanted some energy, like for cooking or heating the house, we'd
switch the light bulb on, point it towards the pile, and give the little generator a
little shove.  It wouldn't take much to git 'er going.

The atoms in the pile would absorb some photons, raising their electrons to higher
energy levels.  Then the electrons would fall back down to lower energy levels,
releasing more energy than they needed to climb up.  We could take that energy,
use some of it to keep the light bulb shining on the pile, and use the extra to heat
the house or run the dishwasher.

The energy an electron absorbs when it climbs to a higher energy level (forming
the atom's absorption spectrum) is precisely identical to the energy it emits when
it falls back to its original level (creating the atom's emission spectrum).

Energy that wasn't either there in the atom to begin with or else pumped
into it from somewhere can't be created there.

You get what you pay for, or, as my grandfather used to say, "For nothing
you get nothing."

Final answer:

The dark absorption lines of an atom's spectrum correspond to the same energies as the bright emission lines. They both reflect energy changes in electron states.

Explanation:

The dark lines of an atom's absorption spectrum are at the same energies as the bright lines of its emission spectrum, therefore the correct answer is a. The bright lines are at the same energies as the dark lines. Absorption spectra are produced when electrons absorb energy and move to a higher energy level, while emission spectra are observed when electrons lose energy and return to a lower energy level.

The dark lines (absorption) and bright lines (emission) coincide because the energy required to move an electron from a lower to higher energy level matches the energy released when an electron drops from a higher to lower state.

Learn more about Absorption and Emission Spectra here:

brainly.com/question/33879980

#SPJ12

When heating water, during what temperature range will the temperature cease to change for some time?A. 98°C–102°C
B. 32°C–43°C
C. 54°C–62°C
D. 84°C–88°C

Answers

When heating the water , the temperature will cease to change for some time at the point where it almost reach the boiling point (that will differ according to the elevation of your place) , which usually in the range of : A. 98 C - 102 C

When heating water, the temperature will cease during 98°C-102°C to change for some time

What does the slope of the line on this velocity versus time graph represent? A.
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B.
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D.
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Answers

What do you mean when you say "this" graph ?  I don't see any graph.

First of all, I'm sure you don't have a "velocity versus time" graph.
You may have a "speed versus time" graph, that doesn't show any
information about the direction of the motion.

As you look at your graph ... a feat that's impossible for me ... 

-- If the line is horizontal, then speed is not changing.  If the direction
of motion is also not changing, then there is zero acceleration.  Sadly,
the graph most likely doesn't carry any information about the direction. 
It's possible that the speed is constant but the direction is changing.
Then acceleration isn't zero, but you can't tell that from the graph.

-- If the line is proceeding upward from left to right, whether it's straight
or curving, then there is positive acceleration.

-- If the line is proceeding downward from left to right, whether it's straight
or curving, then there is negative acceleration, or what some people might
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A car drives for 3 hours at 40 mph, and then drives 300 miles at 60 mph. what is the car's average speed, in mph?

Answers

Answer:

52.5 mph

Explanation:

part 1,

speed=40mph

distance= 40×3=120 miles

time= 3 hours

part 2

speed= 60mph

distance= 300 miles

time= 300÷60= 5hours

Average speed= (300+120)÷(5+3) = 52.5mph
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