A 2-kg rock is thrown vertically upward at a speed of 3.2 m/s from the surface of the moon. If it returns to its starting point in 4 seconds, what is the acceleration due to gravity on the moon?
Answers
Answer:
1.6 m/s2
Explanation:
Let be the gravitational acceleration of the moon. We know that due to the law of energy conservation, kinetic energy (and speed) of the rock when being thrown upwards from the surface and when it returns to the surface is the same. Given that
stays constant, we can conclude that the time it takes to reach its highest point, aka 0 velocity, is the same as the time it takes to fall down from that point to the surface, which is half of the total time, or 4 / 2 = 2 seconds.
So essentially it takes 2s to decelerate from 3.2 m/s to 0. We can use this information to calculate
So the gravitational acceleration on the Moon is 1.6 m/s2
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A man is standing on a weighing machine on a ship which is bobbing up and down with simple harmonic motion of period T=15.0s.Assuming the motion is vertical calculate the amplitude of the ship's motion, if the scale reading of the machine varies between limits of 55.0kg and 65.0kg.
How do summer conditions affect weathering
Projectile A is launched horizontally at a speed of 20. Meters per second from the top of a cliff and strikes a level surface below, 3.0 seconds later. Projectile B is launched horizontally from the same location at a speed of 30. Meters per second. Approximately how high is the cliff?
You can find electric power lines under the ground by looking for magnetic fields at ground level. This is best explained by which of these statements?A) All wires have magnetic materials in them. B) An electric current in a wire produces a magnetic field. C) The power company puts magnets to help find the power lines. D) The iron in the ground is disturbed by the power lines creating magnetic fields
AContrast
BFaces
CColors
Improving the contrast of an image (making the dark regions darker and the light regions lighter) helps us to identify:
AThe edges of objects
BThe center of objects
CThe color of an object
What assumption does our visual system make in order to see curved surfaces (domes, holes)?
ALight comes from above
BCurved surfaces are always evenly lit
CCurved surfaces are always easy to see, no assumptions are made
Which part of the face does our brain pay the most attention to?
AEyes and mouth
BEyes and ears
CEyes and chin
If all these assumptions sometimes lead to mistakes, for example in these optical illusions, why do we make them?
AIt helps us see things faster
BIt helps us see things correctly
CIt helps us pay attention to what's important
DAll of the above
Answers
The connections between neurons in the retina, specifically the connections referred to as “lateral inhibition,” help us see which of the following better?
A) Contrast
B) Faces
C) Colors
2)
Improving the contrast of an image (making the dark regions darker and the light regions lighter) helps us to identify:
A) The edges of objects
B) The center of objects
C) The color of an object
3)
What assumption does our visual system make in order to see curved surfaces (domes, holes)?
A) Light comes from above
B) Curved surfaces are always evenly lit
C) Curved surfaces are always easy to see, no assumptions are made
4)
Which part of the face does our brain pay the most attention to?
A) Eyes and mouth
B) Eyes and ears
C) Eyes and chin
5)
If all these assumptions sometimes lead to mistakes, for example in these optical illusions, why do we make them?
A) It helps us see things faster
B) It helps us see things correctly
C) It helps us pay attention to what's important
D) All of the above
Hope that helps :)
*the correct answers are bolded, italicized, and underlined.*
Answers
Answer:
[OH⁻] = 1 × 10⁻¹¹ mol/dm³
Explanation:
Since the hydronium ion concentration of the gastric fluid is [H₃O]⁺ = 1.0 × 10⁻².
The pH at this point is pH = -log₁₀[H₃O]⁺ = -log₁₀[1.0 × 10⁻²] = 2
When milk of magnesia is added, the pH increases by one unit, so the new pH is 1 + 2 = 3
Since pH + pOH = 14, then pOH = 14 - pH = 14 - 3 = 11
The hydroxide ion concentration of the fluid is gotten from
pOH = -log₁₀[OH⁻]
11 = -log₁₀[OH⁻]
-11 = log₁₀[OH⁻]
taking antilog
[OH⁻] = 1 × 10⁻¹¹ mol/dm³
Answer:
1 × 10^-11 units.
Explanation:
Given:
[H+] = 1 × 10^-2
pH = - log [H+]
= -log [1 × 10^-2]
= 2
The question further said, "which raises the ph of the fluid by one unit"
pH(new) = 2 + 1
= 3
pH + pOH = 14
pOH = 14 - 3
= 11
pOH = - log [OH-]
[OH-] = 10^-11
= 1 × 10^-11 units
Answers
S =4000/500
=Answer
Answers
Answer:
4 m/s
Step-by-Step Explanation:
E = mgh and h = E/mg
So if you put your numbers in the formula : h = 4000J/500 * 10
you will get h = 4/5 meters
use this , If the elevator moves from top to the ground in a constasnt acceleration you will have all energy (4000 J) transformed into acceleration to speed up its motion.
(All potential energy will be turned into movement energy). As explained in this formula;
mgh = mv²/2 , solve out (v) from the equation
v = √2gh = √2·10·4/5 (digits are together- not related to the problem, just for clarification) = 4 m/s
Answer the velocity of the elevator is
4 m/s
Answers
Class one is when the fulcrum is the main acting force to help carry this weight.
Class two is when the person needs to put more effort to carry a weight.
Class three is when load itself helps carry a weight.
It all depends where the load, effort, and fulcrum are located. If the fulcrum is in the middle, it would be the most supportive force. If the fulcrum was at an edge, the effort or load would be the main forces of carrying, depending on their location. Location is important.
They all work synergistically to carry different things. They all help carry, but the different classes seperate them by fulcrum, effort, and load. Also note that the fulcrum is a very important part of a lever, without it, carrying a big box would be very heavy in the absence of a handler.
FULCRUM is the most important part! Remember that!
2. Wheelbarrow . Fulcrum is the wheel. Input = handles Output = objects inside wheelbarrow
3. Baseball bat . Fulcrum is the hands. Input = Bottom section of the bat. Output = top section of the bat with more force.
1.5 amps
7.5 amps
3.3 amps
The purpose of a fuse or circuit breaker is _____.
to speed up the current
to slow down the current
to stop current that is flowing too fast
to stop current that is flowing too slow
Answers
(1) The value of the current depends upon how they are connected.
When placed in series:
The resistance would be: 3+2=5ohms.
Ohm's law is given as:
⇒
When placed in parallel:
The resistance would be:
Now, the current would be:
(2) The purpose of a fuse or circuit breaker is to stop current that is flowing too fast.
A fuse is wire that have low melting point when placed in a circuit. When current is moving too fast i.e. in case of over current, the heat produced melts this wire which further breaks the circuit. Similarly a circuit breaker is a switch which opens up in case of over flow of current.
Thus, a circuit breaker is then used to to stop current that is flowing too fast.
No that other answer is not right they messed up and the right answer would be 0.3 I hope that this helps