Answer:
lead with Z = 82 is transformed into Bismuth with Z = 73
The Po with Z = 84 becomes Pb with Z = 82
Explanation:
Beta decay occurs when a neutron emits an electron and an anti neutrino from the atomic nucleus, therefore the atomic number of the material increases by one unit.
Pb + e + ν → Bi
lead with Z = 82 is transformed into Bismuth with Z = 73
In alpha decay, a helium nucleus is emitted from the nucleus of the atom, therefore the atomic number decreases by two units.
Po +α → Pb
The Po with Z = 84 becomes Pb with Z = 82
How long does it take for an 8 kg pumpkin to hit the ground if dropped from a height of 55 m.
Answer:
t = 3.35 s
Explanation:
It is given that,
Mass of a pumpkin, m = 8 kg
It is dropped from a height of 55 m
We need to find the time taken by it to hit the ground.
Initial velocity of the pumpkin, u = 0
Using second equation of motion to find it as follows :
[tex]h=ut+\dfrac{1}{2}at^2\\\\t=\sqrt{\dfrac{2h}{g}} \\\\t=\sqrt{\dfrac{2(55)}{9.8}} \\\\t=3.35\ s[/tex]
So, it will take 3.35 seconds to hit the ground.
3. Light travels from the Sun to Earth in 8.3 min. Given that the speed of light is 3.00108 m/s, what is the distance in meters between the Sun and Earth?
Answer:
13
Explanation:
13.0120481928 it is the distance
A 25 N force is used to push a box across a floor against a frictional force of 14 N. The box accelerates from rest to a speed of 4 m/s in 16 s. What is the mass of the box?
todjghozjfh-xjdfg .FExplanation:dthgzdfhsfhfh
dhfhdfhdfhhdffhd
If a body is sliding on a inclined plane of angle 30° angle of friction is
Answer: don´t know
Explanation:
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The atomic mass of an element is of that element
Answer:
The atomic mass of an element is the average mass of the atoms of an element, according to google. Sum of protons and neutrons in nucleus is the mass number and multiply by 1 amu gives you the mass of the atom
What has occurred when a solid forms out of the mixing of two liquids in a chemical reaction?
O melting
O gas formation
O combustion
O precipitate formation
Answer:
D is the correct answer
Explanation:
solid is a new substance, and it's called a precipitate.
The precipitate formation is occurred when a solid forms out of mixing two liquids. Hence, precipitate formation is the correct option.
The given problem is based on the chemical reactions and substances formed due to the chemical reactions. The given question says that some solid substance forms out of mixing two liquid substances in a chemical reaction. Now, let us analyze the options:
Melting is the process of conversion of solid substance into liquid substance upon the absorption of heat. Since some solid substance as per the given problem. So clearly melting is not correct option.The gas formation clearly highlights that some gaseous substance is forming. So despite of formation of solid substance in the problem, the gas formation is not the correct option. Combustion involves the production of heat and light, which are not under the category of solid substance. Hence, combustion is not the correct option.Precipitates are the solid substances that are formed in a chemical reaction between the reactants (liquids). Hence, this justifies the given problem and precipitate formation is a correct option.Thus, we can conclude that precipitate formation is occurred when a solid forms out of mixing two liquids.
Learn more about the precipitate formation here:
https://brainly.com/question/19487269
What is the mass of a truck that has a momentum of 10,000 kg*m/s and a velocity of 4m/s North?
Answer:
2500 kg
Explanation:
m=p/v
?=10000kgm/s/4m/s
?=2500 kg
please help!!!!!!!!!!
Answer:
D
Explanation:
I might be wrong but if I was you i would go with D
A car’s velocity changes from 35 m/s to stopped in 13 seconds. Calculate
acceleration.
Answer:
Acceleration = 3m/s^2
Vf= 0 Vi =35m/s t= 13s
Explanation:
[tex]Acceleration = \frac{Change in velocity}{Change in time}\\ = \frac{35m/s}{13s}\\ a = 2.69m/s^2\\ a = 2.7m/s^2\\ a = 3m/s^2[/tex]
Answer the following
Answer: There is nothing here
Explanation: Could you please add a picture or something
Which is a characteristic of a physical change? (1 point)
a
The chemical bonds in the substance are unchanged.
b
The change cannot be seen.
c
The molecules all move at the same speed.
d
The substance has reacted with another substance.
A hot-air balloon is ascending at a rate of 7.5m/s when a passenger drops a camera. If the camera is 27m above the ground when its dropped, how much time does it take for the camera to reach the ground? What is its velocity just before it lands?
Answer:
v_{f}=21.75[m/s] (velocity just before it lands)
t = 2.98 [s]
Explanation:
The key to solving this problem is the initial velocity since when the camera falls it is moving up, we will take this velocity as negative and the acceleration gravitation down as positive.
We will use the following equation of kinematics to solve this problem.
[tex]V_{f}^{2} =V_{o}^{2}+2*g*y[/tex]
where:
Vf = final velocity [m/s²]
Vo = initial velocity = 7.5 [m/s]
g = gravity acceleration = 9.81 [m/s²]
y = elevation = 27 [m]
[tex]v_{f}^{2} = - (7.5)^{2} +(2*9.81*27)\\ v_{f}^{2} = 473.5\\v_{f}=\sqrt{473.5}\\v_{f}=21.75[m/s][/tex]
Now using the following equation of kinematics, we can calculate the time that the fall lasts.
[tex]v_{f}=v_{o}+g*t[/tex]
[tex]21.75 = -7.5 +9.81*t\\9.81*t = 29.25\\t = 2.98[s][/tex]
A body fell freely for 6s.From what height did it start to fall and what was it's speed at the end of the fall?
Answer:
Free fall / falling speed equations1. The force of gravity, g = 9.8 m/s2 Gravity accelerates you at 9.8 meters per second per second. ...
2. Time to splat: sqrt ( 2 * height / 9.8 ) ...
3. Velocity at splat time: sqrt( 2 * g * height ) ...
4. Energy at splat time: 1/2 * mass * velocity2 = mass * g * height.
Explanation:
What effect do you think thermal energy and the transfer of heat in Earth’s interior have on the surface of the planet?
Answer:
I love your pfp also! Put the image i put in full screen and theres your answer
A 20-kg dog on ice skates is accelerating at 2 m/s2. What is the net
force on the dog?
Answer:
22
Explanation:
HELPP ITS DUE IN 5 MINUTES FREE BODY DIAGRAMS
Answer:
I think it's part c . but sorry if its wrong
If a book has a mass of 3 kg, what is the book's weight in N?
Answer:
29.4 N
Explanation:
F = ma
F = (3 kg) (9.8 m/s²)
F = 29.4 N
If a car has a constant acceleration of 4 m/s², starting from rest, how far has it traveled after 5 seconds?
Answer:
100 meters
Explanation:
d=at^2 correct? So you plug in acceleration and time. d=(4)(5)^2 which when using pemdas turns out to 100 meters.
I WILL GIVE BRIANLEST I NEED HELPPP HELPP PLEASE
Answer:
solar system is the first blank
Answer:
atmosphere; solar system; rotations; energy; features; surface; solid; measurements
Explanation:
To be honest there really isn't an explanation. Hope this helps!
What is the power of a crane that does 5.60 kJ of work in 2.80 s?
Answer:
2000 WExplanation:
The power of the crane can be found by using the formula
[tex] p = \frac{ \orange{w}}{ \orange{t}} \\ [/tex]
w is the workdone
t is the time taken
From the question we have
[tex]p = \frac{5600}{2.8} \\ [/tex]
We have the final answer as
2000 WHope this helps you
1 kg ball and a 9 kg ball have the same Ex. Compare
their speeds.
Answer:
The speed of 1 kg ball is 3 times of the speed of 9 kg ball.
Explanation:
It is given that, 1 kg ball and 9 kg ball have the same kinetic energy.
We need to compare their speeds.
The kinetic energy of an object is given by :
[tex]K=\dfrac{1}{2}mv^2[/tex]
Where
m is mass and v is speed
As kinetic energy is same. So,
[tex]m_1v_1^2=m_2v_2^2\\\\\dfrac{v_1^2}{v_2^2}=\dfrac{m_2}{m_1}\\\\\dfrac{v_1^2}{v_2^2}=\dfrac{9}{1}\\\\\dfrac{v_1}{v_2}=\dfrac{3}{1}\\\\v_1=3v_2[/tex]
So, the speed of 1 kg ball is 3 times of the speed of 9kg ball.
The process repeats, producing a
within the gas.
Please help asap
Answer:
Energy materials are traditionally made with a linear approach—materials are taken, products are made, and when they expire or break, they are disposed of. The process repeats.
Explanation:
This may help I don't know
Water is boiled. The resulting steam is blown again huge turbine blades. The turbine blades spin in a magnetic field, producing electricity. The electricity is used to light a lamp. Describe the energy conversions involved.
Answer:
Explanation:
A turbine is a mechanical device that can be used for the conversion of one form of energy into another.
The boiled water generates thermal energy which is blown against a huge turbine blades. The thermal energy is converted to mechanical energy (which drives the blades of the turbine), and sound energy in the turbine. The spinning blades thereby cut the magnetic field as they rotates inducing electric current (Fleming's left hand rule), thus electrical energy is produced.
The electrical energy is now converted to light energy and heat energy by the lamp.
7
The diagram shows a wooden beam PQ, of negligible weight, which is attached to a wall by a
hinge at P and kept in a horizontal position by a vertical rope attached at Q.
The beam is 3.0m in length.
A man of weight 800 N walks along the beam from P to Q.
wall
man
-rope
beam
Р
Q
hinge
1200
What is the distance of the man from P when the tension in the rope at Q becomes equal to
500N?
Gadifada
Answer:
Explanation:
Taking moment of forces about the hinge ,
moment of weight of man = 800 x p where p is his distance of man from hinge , in clockwise direction .
moment of tension force in rope in anticlockwise direction
= 500 x 3
For rotational balancing
800 x p = 500 x 3
p = 1.875 m .
From the principle of moment, the distance of the man from P is 1.9 m
From the question, below are the given parameters;
The Length of the beam = 3mThe weight of the man = 800 NThe tension in the string = 500 NAs the man walks toward the string, the tension on it will act downward, while the normal reaction on the man will act upward.
From the principle of moment,
Clockwise moment = anticlockwise moment
Let us take our moment from point P. That is,
500 x 3 = 800 x d
Make d the subject of formula
d = 1500 / 800
d = 1.875 m
Therefore, the distance of the man from P when the tension in the rope at Q becomes equal to 500N is 1.9 meters approximately.
Learn more about moment here: https://brainly.com/question/6278006
Is it true or false that A proton traveling to the right moves in between the two large plates. A vertical electric field, pointing downwards with magnitude 3.0 N/C, is produced by the plates, the field points is in the same direction on the proton as the force felt by a positive test charge
Answer:
False
Explanation:
In the question it is given that a proton travels in the right moves in between the two plates. An electric field that is pointing in the vertically upward direction has magnitude of 3 N/C. The electric field is produced by the plates.
Now from here we can conclude that the direction of the force acting on the proton when the proton is in between the plates acts in the downward direction. While the electric field lines points in the upward direction. Thus the electric point will not be in the direction of the force that acts on the proton.
Where do we get the matter for us to grow?
Answer:
We get mater to grow by eating food, drinking water and breathing in oxygen
Explanation:
Growing shows an increase in size or mater of a living organism over time, such that the present state of a living organism has an increased amount of matter or inertia than its previous status.
However, by the law of conservation of mater, the amount of mater in a closed system is constant, therefore, we have that for us to grow, new mater must be ingested, which comes from what we take into our bodies
Therefore, we get mater to grow by eating food, drinking water and breathing in oxygen
what change should a rahul make
Answer:
Whats a rahul?
Explanation:
I'll edit this once I know :)
Answer: its B
Explanation: just took the quiz
Which of the following is a derived physical quantity?
A. Time
B. Mass
C. Length
D. Volume
please help!!!!!!!!!!
Answer:
the line b aka the option d
Explanation:
the object is in _________ when the vector sum of the force is acting on the object is equal to zero
Answer:
Equilibrium
Explanation:
An object is in equilibrium when the vector sum of the force acting on the object is equal to zero.
A body in equilibrium is at state of rest of rest or in motion with no external force acting on it.
The resultant of all forces acting on the body is zero. In this case there is no net force and the body will be at rest.