A 615 N student standing on a scale in an elevator notices that the scale reads 645 N. From this information, the student cannot tell that if the elevator is moving upward or downward. The correct answer is option C.
The reason for this is that the scale reading depends not only on the weight of the student but also on the acceleration of the elevator. If the elevator is accelerating upwards, the scale will read more than the actual weight of the student.
Similarly, if the elevator is accelerating downwards, the scale will read less than the actual weight of the student.
In this case, we know that the scale reads 645 N, which is 30 N more than the actual weight of the student (615 N).
However, we don't know whether the elevator is accelerating upwards or downwards. It could be accelerating upwards with an acceleration of 3 m/s^2 (in which case the apparent weight would be 645 N), or it could be accelerating downwards with an acceleration of 3 m/s^2 (in which case the apparent weight would be 585 N).
Therefore, based on the information given, we cannot determine whether the elevator is moving upwards or downwards. The correct option is c.
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if earth would stop receiving heat and light about 8 min what happen
If the Sun disappeared suddenly, we wouldn't know about it for about 8 minutes ... that's how long it takes for heat and light from the Sun to get here to Earth.
8 minutes after the Sun disappeared, the sky would turn totally black. All plants would immediately stop growing ... including all the plants that people or animals eat to live.
Then, after a few more minutes, we would start to notice that it was beginning to slowly get cooler, and that would continue until Earth was too cold for anything to live on it.
A rock is thrown vertically up and reaches a maximum height of 20m. What was its initial velocity?
Answer:
Solve it simply,
Vi = 20 m /sec
Vf = 0 ( at max. height)
g = - 9.8 m/ sq. sec. ( -ve sign shows that the motion of the body is in opposite direction to that of gravity)
Height it gains=h = ?
time taken by the body=t=?
Using 3rd equation of kinematics,
2gh=Vf ˄2 – Vi˄2
implies that
h = Vf ˄2 – Vi˄2 / 2a
h = 0˄2 - (20)˄2 / 2(-9.8) = - 400/ -19.6
h = 20.4 m
So the maximum height the body can gain is approximately equal to 20.4 m.
Now , using 1st equation of kinematics:
Vf = Vi + at implies that,
t = Vf - Vi/g = 0 - 20/ - 9.8 = 2.04 sec.
So, it will take 2.04 sec. to get the max. height.
Note: in simple approximation if we take g =- 10 m/ sq.sec then the max. height the body can attain will be 20 m and the time required for it, is 2 sec.
Why do fingerprints grow back in the same
pattern if they are destroyed?
Answer:You can scar your fingerprints with a cut, or temporarily lose them through abrasion, acid or certain skin conditions, but fingerprints lost in this way will grow back within a month. As you age, skin on your fingertips becomes less elastic and the ridges get thicker.
Explanation:
What is an isotope?
A) Atoms of the SAME element that have different numbers of NEUTRONS.
B) Atoms of DIFFERENT elements that have different numbers of NEUTRONS.
C) Atoms of the same elements that have DIFFERENT numbers of PROTONS.
D) Atoms of the DIFFERENT element that have DIFFERENT numbers of PROTONS.
Please help me!!
:)
10 Points!
Answer:
A
Explanation:
they are atoms of the same element that have the same number of protons but different number of neutrons.
what is the total time that the bullet is in contact with the board?
Answer:
an acceleration of the boy as it passes through the board and be the total time the boy is in contact with the board solution
Why is physics used to study the heat absorbed by the ocean?
A. The ocean is important.
B. Heat is a form of energy.
C. The Sun gives off heat.
D. Physicists mostly study the ocean.
Answer:
B
Explanation:
It absorbs gases, but also heat energy from the atmosphere, distributes them in its depths and thus slows down changes in the entire Earth system. The amount of energy absorbed by the ocean is therefore also an indication of the total heat absorbed by the planet.
Answer:B
Explanation:
Which of the following factors affect the motion of an object? (Select all that apply.)
the mass of the object
the friction involved
the gravity pulling on the object
the amount of force applied to the object
Answer:
The mass of the object.
The friction involved.
The amount of force applied to the object.
The gravity pulling on the object.
Explanation:
I think that all answers are correct with the right explanation.
the mass is what is pulled on by gravity to determine weight.
friction opposes motion.
gravity pulls everything to the earth's centre
force makes an object to either stop, change direction or increase the velocity of an object depending on the amount.
1. A projectile massing 2000 kg is launched at a 42 degree angle to the horizontal with initial velocity of 1000 m/s. Ignoring air resistance:
a. find the range
b. find the max height
c. find the time of flight
A 25 kg sled is pulled across a horizontal surface by a 200 N force at a constant velocity. What is the coefficient of friction between the sled and the surface?
Answer:
0.82
Explanation:
constant velocity.means acceleration a = 0, so net force = 0
F - μmg = ma = 0
so μ = F/(mg) = 200/(25*9.8) = 0.82
What patterns related to the Moon do we still have left on our DQB, that we haven’t yet explained?
Answer:
What patterns can we observe in the sky?
Stars create observable patterns in the form of “dots”, which can be created to make pictures. These are called constellations. The constellations can move in position or location across the sky, but each “piece” in the constellation does not move because stars do not move or change position in relation to other stars.
What are the 12 phases of the moon?
The moon phases in order are new moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, last quarter, waning crescent.
What pattern does the Moon travel around the Earth?
circular The moon orbits the earth in a nearly circular pattern every 27.3 days. The moon's orbit is tilted approximately 5 degrees off of the path of the plane of the ecliptic (or the path that the sun appears to trace across the sky), and orbits at a distance of almost 240,000 miles from the earth.
What patterns do you notice about the Moon and sun across the sky?
The sun follows the same pattern as the moon; it appears to rise in the east and set in the west. The Sun is Always Shining The sun is always shining, even at night when we cannot see it. The sun follows the same pattern as the moon; it appears to rise in the east and set in the west.
What causes the pattern of the Moon?
One important thing to notice is that exactly one half of the moon is always illuminated by the sun. ... So the basic explanation is that the lunar phases are created by changing angles (relative positions) of the earth, the moon and the sun, as the moon orbits the earth.
Explanation:
here are 8 standard phases of the moon, which is demonstrated in this particular diagram very clearly. There’s the new moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, third quarter, waning crescent, and then back around to the new moon.
The most obvious patterns of the moon are the phases of the moon, which move in a month-long cycle. Because the moon reflects its light from the sun, only the part of the moon that faces the sun is visible. As the moon revolves around the Earth, its shadow covers part of its surface.
The Moon. In the natal chart, the position of the Moon by sign shows how we emote and respond to our environment, as well as our instinctual habits, especially in our homes and in private. By house, the Moon’s position shows which areas of life we feel the most “at home” or comfortable.
Patterns in the natural and human designed world can be observed, used to describe phenomena, and used as evidence. In the previous lesson, we determined two patterns for the moon: 1) The moon changes shapes. 2) The moon appears to rise, move across the sky, and set. In today's lesson, we focus in on the first pattern-- the moon's phases.
An object of mass m is oscillating back and forth in simple harmonic motion. The maximum origin, x = 0, and moving in the x direction. Find the following in terms of m, T, and A:(a)The equation of motion of the object, (b)The maximum speed of the object (c)The maximum distance from equilibrium is A, and the period of oscillation is T. At t = 0 the object is at the acceleration of the object.(d)The total energy of the object.
Answer:
x = A sin ω t equation of motion
max speed = A ω
max distance (max value of x) = A
max KE = 1/2 m V^2 = 1/2 m A^2 ω^2
f (frequency) = ω / 2 π = 1 / T or T = 2 π / ω
ω = 2 π / T substitute for ω to put in terms of T
4. Find the period of a pendulum that is 1.2 m long.
Answer:
2.20 s
Explanation:
[tex]T=2\pi\sqrt\frac{L}{g}=2\pi\sqrt\frac{1.2}{9.8}}[/tex]
T = 2.20 s
A 3.8 car is traveling at 19 m/s . What is it's momentum?
The Momentum Calculator uses the formula p=mv, or momentum (p) is equal to mass (m) times velocity (v).
10. In the 16 Personalities Test, what traits are ranked as the primary function according to type dynamics? O A. Judging and prospecting B. Thinking and feeling C. Sociability and shyness O D. Introversion and extroversion
Of the four types of personalities, the traits that are ranked as the primary function according to type dynamics is Judging and prospecting.
What are personality?Personalities refers to the traits characters and attributes possessed inherently by individuals.
The four groups of personalities using the 16 Personalities Tests are;
Judging and prospectingThinking and feelingSociability and shynessIntroversion and extroversionOf the four, the traits that are ranked as the primary function according to type dynamics is Judging and prospecting.
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can someone solve this ?
Explanation:
calculate the applied force in N.
What happens when you increase the amplitude of a sound? (this is science)
( 25 POINTS )There is a light pole on one bank of a small pond. You are standing up while fishing on the other bank. After reflection from the surface of the water, part of the light from the bulb at the top of the pole reaches your eyes. Use a ray diagram to help find a point on the surface of the water from where the reflected ray reaches your eyes.
Determine an expression for the distance from this point on the water to the bottom of the light pole if the height of the pole is H , your height is h , and the distance between you and the light pole is L .
You must answer in terms of these varibles.
Following the Law of reflection we can assume that the expression for the distance from the point of reflection on the water to the bottom of the light pole is d = (H (L-d)) / h.
What does the Law of Reflection state?
The Law states that the reflection angle -θ₂- of an incident ray on a reflecting surface will be equal to the incidence angle -θ₁- of that ray.
Both angles, the reflection and the incidence one, are measured conserning the normal to the surface.
The law of reflection derives from Fermat's principle and states that the triangle formed between the incident ray and the surface, and the triangle produced by the reflected light and the surface are the same.
In the exposed example, if
H is the height of the pole,h is the height of the person,L the distance from the person to the pole,d is the distance from the pole to the point of reflection,L - d is the distance from the person to the point of reflection.If,
θ₁ = θ₂
h/L-d = H/d
Then, the distance from the point of reflection on the water to the bottom of the light pole, d is
d = (H (L-d)) / h
In the atached files you will find the diagram.
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Which statement best describes how the phase of the Moon changes from a nev, moon to a
а
full moon?
The phase of the Moon changes from new Moon to a full Moon when the Moon moves around the earth until it is between the Sun and the Earth.
What is the Moon?The moon is a large massive body which is found in orbits around the earth.
The moon is said to be the satellite of the earth and orbits the earth in the form of a moon cycle or phases.
The moon cycle occurs when the move moves around the earth from the full moon to a new moon.
Therefore, the phase of the Moon changes from new Moon to a full Moon when the Moon moves around the earth until it is between the Sun and the Earth.
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The main focus of the nervous system is to:
Answer:
The main focus of the nervous system is to have nerve fibers pass information throughout the body. The nervous system is crucial for keeping our bodies functioning. It is divided into two main parts, the peripheral nervous system, which are the nerves running throughout the body, and the central nervous system, which is the brain and spinal cord. The nervous system communicates signals between body parts and the brain. The nervous system keeps all body parts functioning through these signals.
Explanation:
I hope this helps!
prove that :
Gas enhaled by us is oxygen ..
Answer:
=> During the respiration process, the total composition of the air that we breathe in also depends on our surrounding environment.
Let say, the underwater divers inhale air containing more oxygen or helium.
Explanation:
=> The air we breathe: three vital respiratory gases and the red blood cell: oxygen, nitric oxide, and carbon dioxide
=> We breathe in oxygen and some of this carbon dioxide.
A solenoid has 450 loops, each of radius 0.0254 m. The field increases from 0T to 3.00 T in 1.55 s. What is the EMF generated in the coil?
Answer:
-1.76
Explanation:
emf=-1.76V
Jhen swam 3 complete laps in a 70 meter pool. (1 lap is one length of the pool)
The total distance covered by Jhen is 210 m and the total displacement is zero (0).
Distance covered by JhenThe total distance covered by Jhen is calculated as follows;
D = 70 m x 3 (since 1 lap is equal to one length of the pool = 70 m)
D = 210 m
Displacement of JhenThe displacement of Jhen is the change in the final position and the initial position of Jhen.
After 3 laps, the final position = the initial position
Displacement = 0
Thus, the total distance covered by Jhen is 210 m and the total displacement is zero (0).
The complete question is below:
Find the total distance and displacement of Jhen.
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The 3 important steps to a perfect forehand in tennis are : perfect swing, type of racket, and correct finish
Question 1 options:
True
False
Answer:
False
Explanation:
The 3 important steps to a perfect forehand in tennis are Preparation,Backswing and Swing and contact.
A Bugatti Veyron went from 0 to 60 mph in 2.5 seconds. What is
the mass of the vehicle if the force used to move the car was
10,000 N?
find the image of (4 "-1)" obtained by translating 4 units up followed by a reflection over the y-axis
Answer:(-4,3)
Explanation: They didn’t show the whole graph so it looks confusing but it’s not.
A horizontal uniform bar of mass 2.5 kg and length 3.0 m is hung horizontally on two vertical strings. String 1 is attached to the end of the bar, and string 2 is attached a distance 0.6 m from the other end. A monkey of mass 1.25 kg walks from one end of the bar to the other.
Required:
Find the tension T1 in string 1 at the moment that the monkey is halfway between the ends of the bar.
Answer: I am not sure if you wanted me to answer this or not.
Explanation:
Estimate the average Cp value, in kJ/kg.K of a gas if 522 kJ of heat are necessary to raise the temperature from 300 K to 800 K holding the pressure constant.
This question involves the concepts of the specific heat, mass, and, temperature.
The average Cp value is "".
SPECIFIC HEAT VALUEThe specific heat of a gas at constant pressure is given by the following formula:
[tex]C_p = \frac{\Delta Q}{m\Delta T}[/tex]
where,
Cp = specific heat = ?ΔQ = heat required = 522 KJΔT = change in temperature = 800 K - 300 K = 500 Km = mass of gas = 1 kg (taking unit mass)Therefore,
[tex]C_p=\frac{522\ KJ}{(1\ kg)(500\ K)}\\\\C_p=1.044\ KJ/Kg.K[/tex]
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WHAT MUST BE APPLIED FOR AN OBJECT TO CHANGE ITS MOTION?
Answer:
Force
Explanation:
An applied force affects the motion of an object. An applied force can be a push, pull, or dragging on an object.
- profparis
Evaluate the powers of 3 to find each value. What is the value of 3-2 What is the value of 30 What is the value 31 What is the value of 33
Answer:
3^-2 is 1/9
3^0 is 1
3^1 is 3
3^3 is 27
Answer:
1/9
1
3
27
Explanation:
In rock climbing, various rope and pulley systems have been devised to help haul up heavy loads, including injured climbers. A rescuer is hauling up an injured climber who weighs 930 N using the rope and pulley system shown in (Figure 1). (The ropes in this figure are drawn at various angles for clarity, but you can assume they're all vertical.) What is the tension in rope 1, the rope that the rescuer pulls on? What is the tension in rope 2?
The tension in ropes 1 and 2 is mathematically given as
a)T1=310N
b)T2=610N
What is the tension in ropes 1 and 2?Question Parameters:
A rescuer is hauling up an injured climber who weighs 930 N
Generally, from the diagram, we see that the respective Tensions is mathematically given as
T2=2T1
Where
T1+T2=930
3T1=930
T1=310N
In conclusion, the tension in rope 2
T2=2T1
T2=2*310
T2=610N
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