Any projectile always has a constant horizontal acceleration of _______.A. 9.81 m.s^2
B. 0 m/s^2
C. -9.81 m/s^2
D. It is not constant.
Answers
Answer: B.
Explanation:
When we talk about projectile motion, we have to deal with parabolic motion, which has two components: vertical and horizontal.
In the case of Earth, the acceleration is due gravity, which is constant and directed downwards (vertically) and have a value of .
Now, in the case of the horizontal component, the acceleration will always be zero.
This is because we are dealing with parabolic movement, the x-component of the velocity remains the same (hence, there is no acceleration), while the y-component always change because it is affected by the acceleration due gravity that acts verticaly.
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Two physics students, Ben and Bonnie, are in the weightlifting room. Bonnie lifts the 50 kg barbell over her head (approximately .60 m) 10 times in one minute; Ben lifts the 50 kg barbell the same distance over his head 10 times in 10 seconds. Which student does the most work? Which student delivers the most power? Explain your answers.
walking converts what type of energy into mechanical energy? A) chemical B) electromagnetic C)nuclear D)thermal
If you push down on a table with a force of 5 newtons, what is the normal force pushing back on you?
A wrench reduces the force needed to tighten a bolt. For this statement to be true, the wrench _____.
Answers
Answer:Central nervous system
Explanation:
viscous, flammable, hard, malleable
2. At room temp., a substance with a melting point of 40% C is a?
solid, liquid, gas, mixture
3. what action involves a chemical change?
making ice cubes,adding sugar to tea, cutting wrapping paper, baking a cake
4.a substance that has a little tendency to change into other substance is said to have low?
reactivity, viscosity, density, conductivity
5. formation of a precipitate is usually evidence of?
the separation of a mixture, a chemical change, formation of a mixture, physical change
Answers
2. We sould consider that room temperature is usually from 18°C (64°F) to 23°C (73°F) and since the melting point of the substance is 40˚C the substance is liquid, because is melting point not an evaporation point it just melts from solid to liquid.
3. Well, in this one we have to consider that a chemical change it change the thing completely. So in this case is baking a cake because the products make the cake stop being them self and created something else.
4. It tends to have low reactivity. This is because viscosity means something like honey very sticky , density is how hard it is and lastly the conductivity I would believe is to pass electricity or current.
5. It is a physical change because the evaporated water transforms again into water and then fall as rain, snow or ice.
Hope it helped <3
Answers
the image on the retina is upside-down, and that worries you.
The answer is: It's all easily handled by that glob of gray stuff inside our head.
The brain takes the inverted image, and responds to it as if it were right-side-up.
That sounds complicated and difficult, because we have no idea how terrific
our brain really is. So let me tell you this story, and it'll blow your mind:
When psychologists realized that the brain was turning everything we see
right-side-up, they did an experiment. They had some special glasses made,
that would turn everything upside-down before it went into the eyes, so that
the image on the retina would be right-side-up, and the person would see
everything upside-down. Then they had some people try to go through their
normal activities with these glasses on. Want to know what happened ?
The test subjects were pretty awkward at first, tripping over things and
bumping into walls. But after a few days, their brain made the adjustment,
and they didn't notice anything strange any more. They could read books,
wash the dishes, play ball, and most of them were even able to ride bicycles
around their neighborhood in the normal way ! Then, when the experiment
was over, they took the glasses off, and they were awkward again for a few
days, and then their brains flipped everything over again and they got
re-adjusted to normal.
THAT's how clever our brain is !
Answers
By using the relation between period and frequency, we conclude that the period of the fork is0.0023 seconds.
What is the period of the vibrating fork?
We know that the relation between period and frequency is:
T = 1/f
where T is the period and f is the frequency.
In this case, we know that the frequency of the fork is 440 Hz, where:
1 Hz = 1/s
Then the period of the fork will be:
T = 1/(440 Hz) = (1/440) s = 0.0023 s
Meaning that each complete vibration of the fork takes 0.0023 seconds.
If you want to learn more about waves, you can read:
or, 440 = 1/t
thus, 440t = 1
thus, t = 1/440
thus, time period is 0.002273 seconds
waves in the ocean
waves in a wheat field
light
Answers
Which of the following does not represent a mechanical wave?
light
B. retrograde motion.
C. Kepler's first law of motion.
D. eccentricity.
Answers
♡♡Hope I helped!!! :)♡♡