The age of the rock is 9 * 10^9 years and there is no rock that can be as old as this age on earth.
What is radioactive decay?The term radioactive decay has to do with the process by which a radioactive nuclide disintegrates so as to obtain the daughter nucleus. The radioactive decay may occur by alpha or by beta radiation.
In this case, we are told that only 25% of the original uranium 238 isotope of half life 4.5 * 10^9 years still remains.
Using the formula;
0.693/[tex]t_{\frac{1}{2}[/tex] = 2.303/t log (No/N)
[tex]t_{\frac{1}{2}[/tex] = half life of the isotope
N= amount of isotope at time t
No = amount of isotope initially present
Then;
0.693/4.5 * 10^9 = 2.303/t log(No/0.25No)
1.54 * 10^-10 = 1.39/t
t = 1.39/1.54 * 10^-10
t = 9 * 10^9 years
There is no rock that is this much old since the average age of the earth is 4.5 billion years.
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what is the main consequence of forming jovian planets starting with extra mass from hydrogen compounds?
The main consequence of forming jovian planets starting with extra mass from hydrogen compounds is that the jovian planets was cold enough for hydrogen compounds to condense into ices. This cause them to grow to large size.
Jovian planets formed in the outer solar system, farther from the sun where ices and rocks were plentiful. The cores accreted rapidly into large clumps of ice and rocks. Jovian planets was cold enough for hydrogen compounds to condense into. Eventually, they become so large, they captured a large amount of hydrogen and other gases from the surrounding nebula with their enormous gravity. The atmosphere of the Jovian planets in our solar system are made mostly of hydrogen and helium compounds and containing hydrogen are--water, ammonia, and methane.
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Convert newton into dyne.
newton is the S.I. unit of force.
dyne is the C.G.S. system of force.
[tex]{ \blue{ \tt{newton = kg {m}^{ - 2}}}}[/tex]
[tex]{ \blue{ \tt{dyne = gcm {s}^{ - 1}}}} [/tex]
[tex]{ \red{ \sf{ \frac{newton}{dyne}}}} = { \green{ \sf{ \frac{10 { \cancel g^{2}} \times 10 { \cancel{cm^{3}}} }{ \cancel{gcm}}}}}[/tex]
[tex]{ \red{ \sf{ \frac{newton}{dyne} }}}= { \boxed{ \purple{ \sf{{10}^{5} \: dyne}}}}[/tex]
Answer:
Explanation:
1 Newton = 100,000 dynes
F = m·a
[ F ] = 1 N = 1 kg · 1 m/s² = 1000 g · 100 cm/c² = 1000·100 g·cm / s²
= 100,000 g·cm / c² = 100,000 dines
A 1500 kg car is traveling down the highway. If the force of air friction on the car is 250
N, with what force must the engine push forward on the car to keep it accelerating at 3
m/s²?
a. 4250 N
b. 4750 N
c. 14,450 N
d. 14,950 N
Answer:
b. 4750 N
Explanation:
F = ma
F = (1500)(3)
F = 4500 N
Force Total = Fa - Ff
4500 = Fa - 250
Fa = 4750 N
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Since the boat is moving in a direction with 5 meters per second without any added force of rowing, it means it is in motion at the same rate of 5 meters. This means the motion is the equivalent to the speed in which it events. Even Newton first law stated ''every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.''
SO: based on the choices the answer is D or The boats motion stays the same!
Answer: D or The boats motion stays the same!
Answer:
It stays the same. D.
Explanation:
If no forces are acting on the boat other than the current the boat's motion should stay the same. Hope you are satisfied with this answer please give me a good rating.
Aspirin therapy has been used after ________ or recurrent _________ to reduce the risk of recurrence. Aspirin is contraindicated for anyone with ______________ ___________.
Answer: Aspirin is recommended as initial treatment to prevent recurrent ischemic stroke. Clopidogrel is recommended as an alternative monotherapy and in patients allergic to aspirin. The combination of clopidogrel and aspirin is not recommended for long-term use (more than two to three years) because of increased bleeding risk. Aspirin has been shown to lower the risk of heart attack and stroke in patients who have cardiovascular disease.
Explanation:
nshbwlhcj.s,ncdj dhd
Answer: yes
Explanation:
Calculate how much gravitational potential energy is lost by an aircraft of mass 80,000 kg if it descends from an altitude of 10,000 m to an altitude of 1000 m. What happens to this energy if the pilot keeps the aircraft's speed constant?
The loss in the gravitataional potential energy is obtained as 7.056 * 10^9 J and this energy is converted to the kinetic energy of the moving aircraft.
What is the change in the gravitational potential energy?The term gravitational potential energy has to do with the energy that is possessed by a body by virtue of its position. Thus it has to do with the height of the object. The greater the height, the more the gravitational potential energy.
Now;
E = mgh
m = mass of the object
g = acceleration due to gravity
h = height of the object
Thus;
The loss in the gravitational potential energy is obtained from;
80,000 * 9.8 (10,000 - 1000)
= 7.056 * 10^9 J
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Identify what is happening at each location of the water cycle. location 3
The water cycle moves from one pond to another i.e. from the river to the ocean, or from the ocean to the atmosphere.
How does location affect the water cycle?The water cycle is the path that all water accompanies as it moves around Earth in other states. The warm dry air at this distance then increases evaporation, which leaves the land beneath even drier. There are three basic locations of water storage that occur in the erratic water cycle. Water is stored in the atmosphere; water is deposited on the surface of the earth, and water is stored in the ground. There is no start or end to the water cycle, but for classification purposes, we will start at the sun.
So we can conclude that the water cycle relates to water being exchanged through Earth's land, ocean, and atmosphere.
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Listed following is a set of statements describing individual stars or characteristics of stars. Match these to the appropriate object category.
a. Red Giant or Supergiant Starts.
b. Main-sequence stars
c. White dwarfs
1. Very cool but very luminous
2. Found in the uppper right of the H-R diagram
3. The majority of stars in our galaxy
4. The Sun, for example
5. A very hot and very luminous star
6. not much larger in radius than Earth
7. Very hot but very dim
The appropriate object category are:
Red giant or super giant → very cool but very luminous→ found in the upper right of the H-R diagram, then
Main sequence stars →The majority of stars in our galaxy→ Sun →for example a very hot and very luminous star, then
White dwarfs → very hot but very d→ not much larger in radius than earth.
Giant:
When stars run out of their fuel that is hydrogen for the nuclear fusion reactions then they would convert into the Giant stars. main sequence stars.
Main Sequence:
Stars are called main sequence stars when their core temperature reaches up to 10 million kelvin and their start the nuclear fusion reactions of hydrogen into helium in the core of the star.
White dwarfs:
When the stars run out of their fuel then they actually shed the outer layer planetary nebula, the remaining core part that remain behind is called as white dwarf.
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What energy is always conserved
Answer:
Renewable Energy took a test on this not to long ago!
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A student has a power output of 250 Watts of poweHow much does the student weigh if she travels 15 meters in 30 seconds?
Answer:
Thank you for helping use
You plan to take a spaceship to the photon sphere
and hover above the black hole to observe the back
of your head. What sort of acceleration will you
experience as you hover at this point? (Answer
qualitatively, e.g., small, comparable to one g, several times g, much bigger than g, incredibly huge.)
The photon rapidly goes towards the 'singularity' at the center of the black hole, and acceleration will increase tremendously towards center of black hole.
The rate at which an item changes its velocity is known as acceleration, a vector variable. If an object's velocity is changing, it is accelerating. A moving object can occasionally alter its velocity by the same amount every second. a moving object that changes its speed by 10 m/s per second. Since the velocity is changing by a fixed amount every second, this is known as a constant acceleration. It is important to distinguish between an item with a constant acceleration and one with a constant velocity. Be not deceived! An object is accelerating if its velocity is changing, whether by a fixed amount or a variable quantity. Additionally, a moving item with a constant speed is not accelerating.
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If Pete (mass = 90.0 kg) weighs himself and finds that he weighs 150 Newtons, how far away from the center of the earth is he?
Based on the acceleration due to gravity of the object at that point, the distance from the center of the object is 1.54 * 10⁷ m
What is the distance from the center of the earth for the object?The distance from the center of the object is calculated using the formula below:
g' = g(r/h)²
where;
g' is the acceleration due to gravity at that point
g is the acceleration due to gravity from the surface of the earth = 9.81 m/s²
r is the radius of the earth = 6.37 * 10⁶ m
h = is the distance away from the center of the earth
The acceleration due to gravity at that point is found using the formula below
F = mg'
g' = F / m
where m is mass
F is force
g' = 150 / 90
g' = 1.67 m/s²
h = r / (√g'/g)
h = 6.37 * 10⁶ / (√1.67/9.81)
h = 1.54 * 10⁷ m
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A race car can be slowed with a constant acceleration of (-11 m/s²). If the car initial velocity 22 m/s, how many meters will it travel before it stops ?
The distance travelled by the race car that is slowed down with a constant acceleration of - 11 m / s² before it comes to a stop is 22 m
a = ( v - u ) / t
a = Acceleration
v = Final velocity
u = Initial velocity
t = Time
a = - 11 m / s²
v = 0
u = 22 m / s
t = ( v - u ) / a
t = ( 0 - 22 ) / - 11
t = 2 s
s = ut + 1 / 2 at²
s = ( 22 * 2 ) + ( 0.5 * - 11 * 2 * 2 )
s = 44 - 22
s = 22 m
Therefore, the car will travel 22 m before it stops
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Which of the following statements about energy is true?
I. Kinetic energy cannot be transformed into another type of energy.
II. Kinetic energy can be transformed into potential energy.
III. Potential energy can be transformed into kinetic energy.
IV. Potential energy cannot be transformed into another type of energy.
the RIGHT answer is II and III only - kinetic energy can be transformed into potential, potential energy can be transformed into kinetic energy
The statement that is true about energy is as follows;
Kinetic energy can be transformed into potential energy (option II)Potential energy can be transformed into kinetic energy (option III)What is kinetic energy?Kinetic energy is the energy possessed by an object because of its motion, equal (nonrelativistically) to one half the mass of the body times the square of its speed.
Potential energy is the energy possessed by an object because of its position (in a gravitational or electric field), or its condition (as a stretched or compressed spring, as a chemical reactant, or by having rest mass).
The law of conservation of energy is a principle stating that energy may not be created or destroyed but instead can be transformed from one form to another.
This suggests that kinetic energy as a type of energy can be changed into the resting form called potential energy and vice versa.
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How would you describe the mass and size the players need to have to play the game?
Answer:
mass and size are the main important to any playing person for more the two extremely don't Matcha the person doesn't play any exercise
A force of 10.0N acts between two unequal charges when they are separated by 0.30m. what will be the force between the charges when the distance between them is increased by 0.15m
Answer:
4.44 N
Explanation:
10 = G m1 m2 / r^2 G m1 and m2 are constant so:
10 = k /r^2
10 = k / (.30^2 )
.9 = k now increase to .45
F = .9 / (.45^2) = 4.44 N
This question is typical on some driver’s license exams: A car moving at 40 km/h skids 14 m with locked brakes. How far will the car skid with locked brakes at 100 km/h? Assume that energy loss is due only to sliding friction
Answer:
the answer is 0
Explanation:
Question 5
Use the following prompt for this question:
A car has a constant velocity of +12 m/s.
Question: Which statement correctly describes the forces acting on the
O the forces are balanced
O the forces are unbalanced
there are no forces acting on the car
There is no acceleration that is imparted to the car, then the forces are balanced.
What are the forces that act on the car?We know that unbalanced force is that which cause a body to move or to cause a body to stop moving at a constant rate. If that is so, then a body that acted upon by a system of balanced forces would remain at rest or would continue in a state of uniform motion.
Given the fact that we have been told that this car is moving at a constant speed of about +12 m/s, it is now plain that what acts on the car must be forces that are balanced since the car is not accelerating.
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25pts
When Joel is riding his bicycle, he and the bicycle have a combined mass of 91.4 kg. The coefficient of kinetic friction between the bicycle's tires and the road is 0.61. If the bicycle was to skid to a stop, what would the force of friction be while the bicycle was sliding?
Ff=897 N
Ff=443 N
Ff=546 N
Ff=55.8 N
The Force of friction on the bicycle of mass 91.4 kg, while moving is 546 N.
What is force?Force is the product of mass and acceleration.
To calculate the force of friction while the bicycle moves, we use the formula below.
Formula:
F = mgμ..................... Equation 1Where:
F = Force of frictionm = Massg = Acceleration due to gravityμ = Cofficient of kinetic frictionFrom the question,
Given:
m = 91.4 kgg = 9.8 m/s²μ = 0.61Substitute these values into equation 1
F = 91.4×9.8×09.61F = 546.39F ≈ 546 NHence, the force of friction on the bicycle is 546 N.
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"The first event in Weightlifting competition is called the Snatch. [...] This lift is done with tremendous power and speed, the bar being lifted from the floor to arms length overhead in one motion, a motion which generally takes less than a second. Amazingly, the heaviest male weightlifters in the world are able to snatch more than 210 kg! (source)
An athlete is lifting 130 kg to a height of 2.45 meters in 0.5 seconds. How much power does he expend?
The power expended by the athlete is determined as 6,242.6 J/s.
What is average power?
The average power of an object can be defined as the proportion of overall work or activity performed by the body to the total time spent by the body.
The unit of average power is watt or joules per second.
Average power is calculated by dividing total energy spent by the total time taken.
Mathematically, the formula for average power is written as;
P = Energy / time
The work done by the athlete or the gravitational potential energy of the weight lifted by the athlete to the given height is calculated as follow;
Energy = P.E = mgh
where;
m is the mass lighth is the vertical heightg is acceleration due to gravityEnergy = 130 x 9.8 x 2.45
Energy = 3121.3 J
Power = 3121.3 J / 0.5 s
Power = 6,242.6 J/s
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write about a time when you felt warm but someone else felt cold
Answer: when i took the blanket from my sibling at night
Explanation:
1900 J of heat is added to 90 g of water at an initial temperature of 18°C. What is the temperature of the water?
1900 J of heat or thermal energy is added to 90 g of water at an initial temperature of 18°C than temperature of the water 21402 K.
What is thermal energy?The energy present in a system that determines its temperature is referred to as thermal energy. Thermal energy flows as heat. Thermodynamics is a whole field of physics that studies how heat is transmitted across various systems and how work is performed in the process.
Given in the question 1900 J of heat is added to 90 g of water at an initial temperature of 18°C.
heat = mass*specific heat*change in temperature
1900 = .09 Kg*1*ΔT
ΔT = 21111
final temperature = 21111 + 291 K
final temperature = 21402 K
1900 J of heat or thermal energy is added to 90 g of water at an initial temperature of 18°C than temperature of the water 21402 K.
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A wheel rotates without friction about a stationary horizontal axis at the center of the wheel. A constant tangential force equal to 73.0 N is applied to the rim of the wheel. The wheel has radius 0.110 m. Starting from rest, the wheel has an angular speed of 14.9 rev/s after 3.41 s. What is the moment of inertia of the wheel?
Answer:
Approximately [tex]0.293\; {\rm kg \cdot m^{2}}[/tex].
Explanation:
Since the wheel started from rest, initial angular velocity will be [tex]\omega_{0} = 0\; {\rm rad \cdot s^{-1}}[/tex]. It is given that the angular velocity [tex]\omega_{1}[/tex] is [tex]14.9\; {\rm rev \cdot s^{-1}}[/tex] after [tex]t = 3.41\; {\rm s}[/tex]. Apply unit conversion and ensure that all angular velocity are measured in radians-per-second:
[tex]\begin{aligned} \omega_{1} &= 14.9\; {\rm rev \cdot s^{-1}} \times \frac{2\, \pi \; {\rm rad}}{1\; {\rm rev}} \\ &\approx 93.620\; {\rm rad \cdot s^{-1}}\end{aligned}[/tex].
Change in angular velocity:
[tex]\begin{aligned} \Delta \omega = \omega_{1} - \omega_{0} \approx 93.620\; {\rm rad \cdot s^{-1}}\end{aligned}[/tex].
Since the tangential force is constant and there is no friction on the wheel, the angular acceleration [tex]\alpha[/tex] of this wheel will be constant. Since the change in velocity [tex]\Delta \omega \approx 93.620\; {\rm rad \cdot s^{-1}}[/tex] was achieved within [tex]t = 3.41\; {\rm s}[/tex], the average angular acceleration will be:
[tex]\begin{aligned} \alpha &= \frac{\Delta \omega}{t} \\ &\approx \frac{93.620\; {\rm rad \cdot s^{-1}}}{3.41\; {\rm s}} \\ &\approx 27.45\; {\rm rad \cdot s^{-2}}\end{aligned}[/tex].
At a distance of [tex]r = 0.110\; {\rm m}[/tex] from the axis of rotation, the tangential force [tex]F = 73.0\; {\rm N}[/tex] will exert on the wheel a torque [tex]\tau[/tex] of magnitude:
[tex]\begin{aligned} \tau &= F\, r \\ &= (73.0\; {\rm N})\, (0.110\; {\rm m}) \\ &\approx 8.030\; {\rm N \cdot m}\end{aligned}[/tex].
Let [tex]I[/tex] denote the moment of inertia of this wheel. The equation [tex]\alpha = (\tau / I)[/tex] relates angular acceleration [tex]\alpha[/tex] to moment of inertia [tex]I\![/tex] and net torque [tex]\tau[/tex]. Rearrange this equation to find the moment of inertia:
[tex]\begin{aligned}I &= \frac{\tau}{\alpha} \\ &\approx \frac{8.030\; {\rm N\cdot m}}{27.45\; {\rm rad \cdot s^{-2}}} \\ &\approx 0.293\; {\rm N \cdot m \cdot s^{2}} \\ &= 0.293 \; {\rm kg \cdot m^{2}}\end{aligned}[/tex].
Note that the unit "radians" is typically ignored. Additionally, [tex]1\; {\rm N} = 1\; {\rm kg \cdot m \cdot s^{-2}}[/tex].
Hence, the moment of inertia of this wheel is approximately [tex]0.293\; {\rm kg \cdot m^{2}}[/tex].
Convert 13.50 g/cm3 to SI unit
13.50 g/cm³ value when converted into SI unit is 13500 kg/m³.
SI stands for system international that is standardized to be used for research , various purposes.
1 gram /cm³=1000 kg/m³
so therefore 13.50g/cm³= 13.50 x 10³kg/m³
The reason behind using kg as SI unit of mass is because its defined by taking fixed numerical value of plank's constant.
SI unit of length is metre as it's defined by taking fixed numerical value of speed of light in vacuum. so unit of volume is m³.
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Which of the following is NOT a way that machines provide a mechanical advantage? a. change direction c. change power b. change distance d. change force Please select the best answer from the choices provided A B C D
The following which is not a way that machines provide a mechanical advantage is that it changes power and is denoted as option C.
What is Mechanical advantage?This is referred to the measure of how much a force is increased by using a tool or machine and is calculated by finding the ratio of the output force to input force.
Changing the power is not a way in which machines provide a mechanical advantage as a result of the parameter not directly involved in how it functions which is therefore the reason why it was chosen as the correct choice.
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Which statement is NOT true?
O Acceleration is always a positive number.
O Acceleration has the SI units of m/s².
O The slope on a speed-time graph is the object's acceleration.
O
To calculate the acceleration of an object, the change in velocity is divided by the length of the time interval over which
the change occurs.
Statement 1 is not correct.
The rate at which velocity changes over time, both in terms of speed and direction, is defined as acceleration. A point or object traveling in a straight path is accelerated if it accelerates or decelerates. Even if the speed is constant, the motion of a circle is accelerated because the direction is constantly changing.
Given that
Acceleration is always a positive number.
Acceleration has SI units of m/s².
The slope on a speed-time graph is the object's acceleration.
To calculate the acceleration of an object, the change in velocity is divided by the length of the time interval over which the change occurs.
When a body accelerates, it is positive; when it slows, it is negative. Positive acceleration is directed along the velocity axis. Negative acceleration, on the other hand, is oriented in the opposite direction as the velocity.
The SI unit of acceleration is m/s2. Because acceleration is defined as velocity in meters per second divided by time in seconds, the SI units for acceleration are m/s2, meters per second squared, or meters per second per second, which essentially means how many meters per second the velocity changes every second.
The acceleration of an item is represented by the slope of a speed-time graph. The slope of a speed-time graph displays the rate of change of the body's speed and is known as acceleration.
To compute an object's acceleration, divide the change in velocity by the length of the time interval over which the change occurs. When you accelerate quickly, you apply a lot of force on an object. Depending on the speed and direction, acceleration can be either positive or negative.
A = velocity change/time
A = (vf- v1)/time
Therefore statement 1 is not correct
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Earth rotate once every 24 hours. In a reference frame fixed to Earth, how far does
a point on the equator move in 1 hour? RE = 6.34×106 m
In a reference frame fixed to Earth, a point on the equator moves zero distance in 1 hour.
What is the frame of reference?A frame of reference in physics is made up of an abstract coordinate system and the collection of physical reference points that fix the coordinate system specifically and regulate measurements inside it.
When we take a reference frame fixed to Earth, the displacement due to earth's rotation can not be measured. So, any point on earth remains in rest through out the day with respect to the reference frame fixed to Earth. Hence, a point on the equator moves no distance in 1 hour in a reference frame fixed to Earth.
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Feeling Generous
Question
What is x?
x+7=99
Answer: 92
Explanation:
equation : x+7=99
here, we need to get x alone so we subtract 7 from both sides
x +7-7 = 99 -7 on the left side of the equation the 7s cancel out
x=92
What is the general result of the proton-proton chain?
The genral result of the proton-proton chain is the formation of Helium Nucleus i.e., 4 hydrogen combined to form one helium nucleus.
Proton-proton chains are also called p-p chains, proton-proton cycles, or proton-proton reactions.
Roton-Proton Chain.
⁴H ---> He + energy + other
In the proton-proton chain, four hydrogen nuclei (protons) combine to form a helium nucleus. This results in a loss of the original mass. But some energy escapes in the form of neutrinos. First, two hydrogen nuclei (¹H) combine to release a positive electron (e+, positron) and a neutrino (ν) to form a hydrogen 2 nucleus (²H, deuterium).
¹H + ¹H --> ²H + e + ν
The hydrogen 2 nucleus quickly captures another proton to form a helium 3 (³He) nucleus while emitting a gamma (γ) ray.
²H + ¹H --> ³He + γ
From this point, the reaction chain can follow one of several paths, but always leads to a helium-4 nucleus emitting a total of two protons.
³He + He --> ⁴He + ¹H + ¹H
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