Answer:
0.75 grams
Explanation:
Today we have 6 grams
In 30 years, 3 grams remain
In 60 years 1.5 grams remain
in 90 years 0.75 grams remain
mathematically It would look like this
m = 6(0.5⁽ⁿ/³⁰⁾) where n is number of years
An advertisement shows a 1239 kg car slowly pulling at constant speed a large passenger airplane to demonstrate the power of
its newly designed 85.7 hp (horsepower) engine. During the pull, the car passes two landmarks spaced 26.0 m apart in 14.3 s.
The passenger plane being towed is a Boeing 707 with a total weight of 62.5 tons.
Calculate the force that opposes the motion. Assume that the efficiency of the car is such that 15.4% of the engine power is
available to propel the car forward.
How much work is performed by the car on the airplane during this time? How much work is performed by the airplane on the car during this time?
Answer:
Power = Work / Time
available power = .154 * 85.7 = 13.2 hp
1 hp = 746 watts (joule/sec)
13.2 hp = 13.2 * 746 = 9850 J/sec
Work = P * t = 9850 J/sec * 14.3 s = 141,000 joules
This is the work performed on the airplane and the car
Work = F * s (force * distance)
F = 141000 J / 26 m = 5420 Newtons opposes the motion
help please! ill mark brainliest!
What happens to a moving object if NO unbalanced force acts upon it?
It eventually slows down and comes to a stop.
It speeds up in the direction of motion.
It will eventually change direction.
It continues to move at the same speed.
Answer:Newton's first law of motion indicates that an objects motion or lack of motion will stay the same unless acted upon by an unbalanced force.
Explanation:
When the sun heats up the suface of the water, the water
Answer:
In the water cycle, evaporation occurs when sunlight warms the surface of the water. The heat from the sun makes the water molecules move faster and faster, until they move so fast they escape as a gas. Once evaporated, a molecule of water vapor spends about ten days in the air.
Explanation:
please can anybody tell me what is this lab equipment
Answer:
hii there
its a test tube holder
Explanation:
hope it helps
How does the appearance of spiral galaxies vary? *Select the two correct answers.*
A. They vary in how tightly their arms are wound.
B. They vary in the brightness of stars located on their arms.
C. Some are more elongated in shape than others.
D. Some have a band of stars and materials through their middle, but others do not
Answer:
A. And D.
A. They vary in how tightly their arms are wound.
D. Some have a band of stars and materials through their middle, but others do not.
The appearance of spiral galaxies vary in the following ways:
A. They vary in how tightly their arms are wound.
D. Some have a band of stars and materials through their middle, but others do not
Spiral galaxies are the galaxies where the gas clouds and the stars are concentrated in spiral arms.
Examples of spiral galaxies include Milky way, Sunflower Galaxy, Andromeda Galaxy, etc.
It should be noted that spiral galaxies vary in how tightly their arms are wound while some have a band of stars and materials through their middle, but others do not.
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If your hammer develops a loose head, you can tighten it by banging
it on the ground. A little physics secret though - it's better to bang
the hammer head up rather than head down. Explain, using inertia.
weight from the hammer head makes the inertia better making it better with the head up it. the body has less weight the inertia force isn't as good. (or something like that.)
A motor with an operating resistance of 30.0 ohms is connected to a voltage source 4.0 amps of current flow in the circuit. What is the voltage of the source
Answer:
120 V.
Explanation:
voltage V=IxR
= 4x30
= 120 V.
Evaluate tan(24°).
ОА. 1.36
В. 0.45
Ос. 0.41
OD. 0.91
Answer:
B. 0.45
Explanation:
You just need to plug this into a calculator.
During which section was the person moving at the highest speed? What was their speed? Defend your answer.
Where's the person that the question is talking about?
Answer:
d was
Explanation:
A car drives around a racetrack for 30 seconds. What do you need to know to
calculate the instantaneous speed of the car at a given point?
A. The total displacement of the car
B. The time needed to drive 1 lap
C. The slope of the car's position-time graph
D. The average speed of the car
Answer: the slope of the cars position-time graph
Explanation:
Just took the test
During hypnosis, people:
A. can accurately recall memories of early childhood and infancy.
B. lose all awareness of their surroundings.
C. temporarily suspend their sense of initiative.
D. are in a deep trance, which is similar to stage 3 NREM sleep.
During hypnosis, people temporarily suspend their sense of initiative. Hence, option (C) is correct.
What is hypnosis?
According to one definition, hypnosis is "a waking state of awareness, (or consciousness), in which a person's attention is diverted from his or her immediate surroundings and is consumed by interior experiences such as feelings, cognition, and images." In order to induce hypnosis, the subject must concentrate and become sufficiently absorbed in their imagination. A hypnotic world is created by the physician and patient through the use of suggestions and their acceptance.
Our everyday 'trance' states include things like becoming lost in a good book, driving down a familiar route without being aware of it, being in prayer or meditation, or engaging in a mindless or creative task. Our conscious awareness of our surrounds and an inner awareness exist on a continuum, thus even though one's emphasis is mostly internal in these states, one does not necessarily lose all awareness of the outside world.
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Three boxes are stacked on top of a cart. As the cart is moving, it comes to an abrupt stop. The boxes fall forward off of the cart. Explain why the boxes fell forward.
plz help i will sure appreciate it
A box slides down a frictionless incline, gaining speed. The work done by the normal force n is _______.
a.) positive
b.) negative
c.) zero
d.) undefined
Answer:
0
Explanation:
The normal force will be perpendicular to the motion. A zero-work situation is one where "a force everywhere perpendicular to the motion does no work" so according to this principle, no work is done.
The work done by the normal force n when the box slides down a frictionless incline and gaining speed is zero.
What is normal force?The force of contact is called the normal force. When the two surfaces are in contact with each other, then the normal force acts.
This force is applied by the solid bodies on each other in order to prevent the passing through each other.
A box slides down a frictionless incline, gaining speed. For this box, the value of work done by normal force has to be found out. Let's analyze the given condition.
The body is gaining the speed, which means there is a change in kinetic energy.The change in kinetic energy is equal to the work done.The friction force is the product of coefficient of the friction and normal force.The friction force for the given case is zero. Thus, the normal force must be equal to the zero.Thus, the work done by the normal force n when the box slides down a frictionless incline and gaining speed is zero.
Learn more about the normal force here;
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1)How fast is a ball moving when falling from rest and hits the ground 1.70
seconds later?
The final velocity of the ball is16.66 m/s.
Given the following data:
Initial velocity, U = 0 m/s (since the ball is falling from rest). Time, t = 1.70 seconds.We know that acceleration due to gravity (a) for a ball in free fall is equal to 9.8 meter per seconds square.
To find how fast (velocity) the ball is moving, we would use the first equation of motion:
Mathematically, the first equation of motion is calculated by using the formula;
[tex]V = U + at[/tex]
Where:
V is the final velocity. U is the initial velocity.a is the acceleration. t is the time measured in seconds.Substituting the given parameters into the formula, we have;
[tex]V = 0 + 9.8(1.7)[/tex]
[tex]V = 9.8[/tex] × [tex]1.70[/tex]
Final velocity, V = 16.66 m/s.
Therefore, the final velocity of the ball is16.66 m/s.
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2
8
1 point
What is the name of the element with 2 energy levels and 6 valence electrons?
Sulfur
Oxygen
Barium
Chromium
G
9
1 point
Answer:
oxygen is the right answer.
A car stops from a speed of 15 m/s in 3 s. How far did it go while stopping?
Answer:
5m/s
Explanation:
15m/s ÷ 3s = 5m/s
A machine has an efficiency of 15% . If the energy inputs is 300 joules, how much useful energy is generated
Answer:
you made with your performance, and then consider whether you would do anything differently if yo
Explanation:
The useful energy generated by the machine having an efficiency of 15% and an energy input of 300 J is 45 J
From the question given above, the following data were obtained:Efficiency = 15% = 0.15
Work input = 300 J
Work output =?The useful energy generated (i.e work output) by the machine can be obtained as follow:
[tex]Efficiency = \frac{workout}{workin} * 100\\\\0.15 = \frac{Workout}{300}[/tex]
Cross multiply
Work output = 0.15 × 300
Work output = 45 JTherefore, the useful energy generated by the machine is 45 J
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Tarea del 21 de octubre 2021 del 5 de primaria
Answer:xss
zzz
Explanation:
zzz
4. In which of the following circuits will the bulb glow?
a) switch ON, a connecting wire broken
b) switch OFF
c) switch ON, no broken wire
d) switch ON, one of the wires replaced by a
rubber band
Answer:
I believe is C.
Explanation:
its quite obvious:)
What are some of the strategies that you currently use to make consumer buying decisions
Answer: hope you find the explanation useful!
Explanation:
Consumer behavior considers numerous reasons why individual, situational, mental, and social individuals look for items, purchase, use, and afterward discard them.
Evaluative criteria are positive qualities that are imperative to you, for example, the cost of the knapsack, the size, the number of compartments, and shading. A portion of these attributes are valued highly as compared to others. For instance, the size of the rucksack and the cost may be more imperative to you than the shading except if, state, the shading is hot pink, and you despise pink.
The function of which system is to release energy from food for cells to use and to take oxygen into the blood and to remove carbon dioxide?
Digestive
Circulatory
Respiratory
Excretory
Kelvin is a unit of temperature, whereas ampere is a unit of current.
True or False
Answer:
Kelvin is a unit of temperature, whereas ampere is a unit of current.
True or False
Explanation:
true
Energy can be transformed from one form to another. The diagram shows one such process.
Which energy transformation is represented in the diagram?
nuclear to thermal and radiant
nuclear to electrical and chemical
chemical to nuclear and radiant
chemical to electrical and nuclear
Answer:
b
Explanation:
Answer
nuclear to electrical and chemical
Explanation:
Energy can be transformed from one form to another. The diagram shows one such process.
Which energy transformation is represented in the diagram?
nuclear to thermal and radiant
nuclear to electrical and chemical
chemical to nuclear and radiant
chemical to electrical and nuclear and it is ovisly b
When developing an experimental design, which action could a scientist take to improve the quality of the result?
Answer: You can Identify any biases about the answer to the scientific question.
Explanation:
What happens when acetate rubs with wool
When a Cellulose Acetate rod is rubbed with a woolen duster, friction occurs, rubbing loosely held electrons from the rod onto the duster. So, this time, the rod loses electrons. Since the Acetate rod now has fewer electrons than protons it has become positively charged. Hope this helps!
Answer:
The charge becomes positive.
Explanation:
When rubbed with cellulose acetate the charge of the fur/wool will become negative.
If you can do something fast and with strength, you have balance.
A.
True
B.
False
Answer:
false
Explanation:
5. Sarah is standing 32.0 m away from Jason. If Sarah throws a snowball at a 45 degree
angle for maximum distance, what velocity must the snowball have to hit Jason directly.
(Assume Jason and Sarah are about the same height so that if she throws the snowball
from head level, it will hit Jason in the head.)
Answer:
Explanation:
If air resistance is ignored and assume UP and Toward Jason are the positive directions.
horizontal analysis
d = (vx₀)t
t = d/vx₀
horizontal analysis
0 = vy₀t + ½gt²
0 = vy₀(d/vx₀)+ ½g(d/vx₀)²
as vy₀ = v₀sin45 and vx₀ = v₀cos45 and are equal.
0 = d + ½g(d²/v₀²cos²45)
-d = ½g(d²/v₀²cos²45)
-dv₀² = ½g(d²/cos²45)
v₀² = -½g(d/cos²45)
v₀² = -½(-9.81(32.0/cos²45)
v₀² = 313.92
v₀ = 17.717787...
v₀ = 17.7 m/s
A physics teacher walks 4 meters East, 2 meters South, 4 meters West, and finally 2 meters North. What is the distance and displacement of this teacher?
A hunter is practicing hitting a target that is down range. If the arrow leaves the bow at a
velocity of 26 m/s at an angle of 40 degrees above the horizontal,
a. Calculate how much time it takes for the arrow to return to the bow level.
b. Find out how far down range the arrow goes.
c. What is the maximum altitude the arrow reaches?
Answer:
What kind of bow Is he using