Answer:
860.6 years.
Explanation:
The parameters given are;
Initial detector activity = 370000 alpha decays per second
Final detector activity = 93000 alpha decays per second
Formula for time to change in activity is given by the following relation;
[tex]t_{93000} = \dfrac{-ln\dfrac{A}{A_0} }{\lambda} = \dfrac{-ln\dfrac{93000}{370000} }{5.08 \times 10^{-11}} = 2.72 \times 10^{10} \, seconds[/tex]
t₉₃₀₀₀ = 2.72 × 10¹⁰ seconds = 860.6 years.
A net force of 400 Newtons acts on a 50kg mass. What is its acceleration?
A 450 m/s/s
B 8 m/s/s
C20,000 m/s/s
D 350 m/s/s
E.125 m/s/s
Explanation:
Formula = F = ma
Where f is force m is mass and a is acceleration
400 = 50a
400/50 = a
8
Option B is the correct answer
Answer:
the answer is B
Explanation: because, force=mass x acceleration, which acceleration=force : mass.
So, acceleration= 400 : 50=8m/s/s :D
The Theory of General Relativity, proposed by Albert Einstein, has given scientists a way to
understand
_ as it relates to bodies in motion.
(1 point)
matter
entropy
gravity
energy
The electromagnetic waves with the most energy have the greatest
period
b) wavelength
c)
frequency
d) color
Frequency is the amount of times the particle moves back and forth per second, more or less. The more energy, the higher the frequency. At the same time, the more energy means you'll have a shorter wavelength (aka period). Color only applies to the visible spectrum.
Answer:
frequency
Explanation: The greater the number of waves appear the greater the energy. The smaller the number of waves appear the lower the energy.
Frequency is the number of times waves appear.
As an object falls to the ground, what happens to its energy? Ignore air resistance in this scenario.
A)energy is converted from gravitational potential energy to kinetic energy.
B)energy is converted from kinetic energy to
gravitational potential energy.
C)energy is in motion the whole time.
D)energy gets destroyed due to friction
Answer:
the answer is a
Explanation:
due to it being high and kenetic is in motion
When the object falls to the ground so the option A should be considered for energy.
Impact on energy:In the case when the object falls to the ground, so here the energy should be transformed from the gravitational potential energy to the kinetic energy as both are considered since the objects fallen into the ground.
Learn more about the energy here: https://brainly.com/question/19119593
What is the connection between the force it take to move an object of different masses?
Answer:
Gravity affects weight, it does not affect mass. MASSES ALWAYS REMAIN THE SAME. Newton's Second Law of Motion: Force = mass x acceleration The acceleration of an object is: a) directly proportional to the net force acting on the object
hope this helps u stay safe
Explanation:
PLEASE HELP !!
what is the mass of mr. thomson’s prius if his kinetic energy is 641300 J when he is driving at a velocity of 22 meters per second on the highway? please show work
Explanation:
It is given that
The kinetic energy of Mr. Thomson’s prius, K = 641300 J
He is moving with a velocity, v = 22 m/s
It is required to find the mass of Mr. Thomson’s prius.
Due to his motion, a kinetic energy will possess by him. The mathematical form of kinetic energy is given by :
[tex]K=\dfrac{1}{2}mv^2[/tex]
Solving for m
[tex]m=\dfrac{2K}{v^2}[/tex]
Plugging all the values, we get :
[tex]m=\dfrac{2K}{v^2}\\\\m=\dfrac{2\times 641300}{(22)^2}\\\\m=2650\ kg[/tex]
So, the mass of Mr. Thomson’s prius is 2650 kg.
A 1.200 kg car travels at 20 m/s. What is its momentum? P=mv
A)24000 kg m/s
B)14000 kg m/s
C)8000 kg m/s
D)1220 kg m/s
Answer:
A
Explanation:
Answer:
Answer A
Explanation:
P = mv
P = 1200 kg × 20 m/s
P = 2400 kg m/s
So the answer would be A
Which question could be answered using the scientific method?
Why does my dog like to sit on the sofa?
Would Mars be a fun place to live?
Are butterflies happy?
Do vitamins help people stay healthy?
Answer:The vitamins one.
Explanation:
Answer:
d. do vitamins help people stay healthy
Explanation:
flvs
A frictionless roller coaster (22kg) is at a height h traveling with a speed v0 = 10m / s. Assume that h = 20m. The speed of the car at point B is:
Answer:
3 g
Explanation:
what is the mass of mr. thomson’s prius if his kinetic energy is 641300 J when he is driving at a velocity of 22 meters per second on the highway? please show work
Answer:
Mass, m = 2650 kg
Explanation:
We have,
Kinetic energy of Mr. Thomson’s prius is 641300 J
He is moving with a velocity of 22 m/s
It is required to find the mass of Mr. Thomson’s prius.
Kinetic energy,
[tex]K=\dfrac{1}{2}mv^2[/tex]
Plugging all the values, we get :
[tex]m=\dfrac{2K}{v^2}\\\\m=\dfrac{2\times 641300}{(22)^2}\\\\m=2650\ kg[/tex]
So, the mass of Mr. Thomson’s prius is 2650 kg.
Besides air pollution, the student was concerns about water/ocean pollution. They heard many recent issues of too much plastic in the ocean and other pollutants in the water. The pie chart below provides data on the sources and amounts of different pollutants entering the oceans.
first picture
The student read a news article that discussed the increase in amount of pollutants entering oceans and washing up on shores. The article included this image.
second picture
pick the answer
The greatest reduction in pollutants entering the ocean could be achieved if it were possible to reduce farm runoff/transportation/air pollutants/sewage/litter/ orindustry waste.
Answer:
Sewage
Explanation:
It has the greatest percentage out of the pie chart.
Andrew Haber is an astronaut in space, far away from gravitational and frictional forces. He throws a tennis ball. The ball will:
A) come back to him
B) gradually come to rest
C) continue to move in a straight line with uniform velocity
D) come to rest abruptly
Answer:
the answer is C.
Explanation:
continue to move in a straight line with uniform velocity.
Andrew Haber is an astronaut in space, far away from gravitational and frictional forces. He throws a tennis ball. The ball will continue to move in a straight line with uniform velocity. The correct option is C.
What are gravitational and frictional forces?Gravity always pulls things down, whether it's a desk, a book, or a person. As a result, gravity pulls you down to the ground as you jump. But friction doesn't drag things down. But friction doesn't drag things down.
The direction of the push used to move the body is the opposite of the direction of friction. Because of the increased force of friction, sliding a body across a surface becomes more difficult when gravity is strong.
Therefore, the correct option is C) continue to move in a straight line with uniform velocity.
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GIVING BRAINIEST TO CORRECT ANSWER
If you sit close to a campfire, the fire warms you. Describe how thermal energy is transferred from the fire to you.
Answer:
Explanation:
When you sit by a campfire, most of the heat you are receiving from the fire does not come from hot air. ... This radiation carries energy which is converted to heat when it hits another object and is absorbed. In contrast, conduction involves the direct movement of heat through an object.
hi:) anyone able to explain why it’s easier to lift something on moon compared to earth? thanks:)
Because the moon has much less mass than the Earth has. This makes the gravitational forces between the moon and any object much less than the forces between the Earth and the same object, when the object is the same distance from the center of the moon or the Earth.
To talk about an actual number, we usually talk about being on the surface of the Earth or the moon:
A person or object on the surface of the moon weighs about 17% as much as he/it weighs on the surface of Earth. That's about one-sixth as much. So naturally, it's easier to lift something on the moon than it is to lift the same thing on Earth, because when it's on Earth, it's about six times as heavy.
Which of the following can cause the substance to change phase? Select all that apply
mchange in temperature
u change in mass
change of shape
I change in pressure
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ASK FOR HELP
Answer:
change in temperature
Explanation:
just like a rock, if it is put in different temperatures, the different substance you get.
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Both mechanical and electromagnetic waves
Answer:
transmit energy
Explanation:
hope this helps u stay safe
help me ASAP plzzzzzzzz!!!!!!
Answer:
A long handle
Explanation:
A spanner is basically a wrench, you would also want to use a long handled wrench in order to have more mechanical advantage and be able to apply more torque. This can be proven as well using a simple physics formula:
[tex]t = fd[/tex]
where the variables are:
t = torque
f = applied force
d = perpendicular distance from fulcrum to where the force is applied
It is clear that keeping the applied force constant, if you enlarge the perpendicular distance, d, you will be able to apply more torque and therefore have an easier time releasing this nut.
Farah is doing an experiment that involves calculating the speed of a longitudinal wave. What will most likely happen if she increases the temperature in the room?
The amplitude of the wave will increase.
The amplitude of the wave will decrease.
The speed of the wave will increase.
The speed of the wave will decrease.
Answer:
Explanation:
it will result in rise in frequency of the wave ...
so speed of the wave will increase...
If Farah increases the temperature in the room during the experiment, C. the speed of the wave will increase.
What is a longitudinal wave?A longitudinal wave is the opposite of a transverse wave and it can be defined as a type of wave that usually travel in the same direction of its oscillation.
Generally, there is a direct (linear) relationship between the speed of the wave and temperature.
This ultimately implies that, if Farah increases the temperature in the room during the experiment, the speed of the wave will increase due to an increase in its frequency.
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suppose that two point charges, each with a charge of +1.00 C, are separated by a distance of 1.0m, will the chargers attract or repel?
Answer:
They would repel because they are opposites
Explanation:
The two point charges will repel each other with a force of 9×10⁹N because they both have the same nature of the charge.
Electrostatic force:Given two point charges with a charge of +1.00 C. Separated by a distance of 1 m.
So, q₁ = q₂ = 1C and distance r = 1m
Since the charges are alike, that is both of them are positive charges, they will repel each other with an electrostatic force given by:
F = kq₁q₂/r²
where k is Coulomb's constant.
F = 9×10⁹×1²/1²
F = 9×10⁹N
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R1 -4.00
M
- V = 12.0 V
Т.
1. Using Ohm's Law, Calculate the current / flowing
through the circuit in Figure 1.
Show all work.
Answer: V = 12.0 V
Explanation:
The slope of a velocity versus time graph gives
Explanation:
Average of acceleration
pls help quickly average velocity = u+v/2 or displacement/ total time taken
Answer: Average velocity = u+v/2
Explanation: The definition of velocity is displacement over time taken. That is,
Velocity = displacement/ time taken
But we have initial velocity U and final velocity V. When we are talking about average, we are talking about the mean value of the given parameters.
Therefore, average velocity will be addition of initial velocity and final velocity divided by 2. That is,
Average velocity = (U + V)/2
An object has a forward force of 100N and a reverse force of 25N. What is the resultant force?
Given:
An object has a forward force = 100NAn object has a reverse force = 25NTo find out:
What is the resultant force?
Solution:
Resultant Force = Forward force + Reserve force
= 100 N + ( - 25 N )
= 75 N
Answer:
75 N
Explanation:
The resultant force can be found using the following formula:
F=forward force + reverse force.
The forward force is 100 N.
The reverse force is 25 N. Since it is a reverse force, it is actually equal to -25 N.
forward force=100 N
reverse force= -25 N
Substitute these values into the formula
F=100 N + -25 N
Add 100 and -25
F= 75 N
The resultant force is 75 Newtons.
ILL GIVE BRAINLIEST!! URGENT PLEASE HELP
Red light has the wavelength of 6.55 X 10 ^-7m. What is its frequency in hertz.
1. 4.58 hz
2. 4.58x10^14hz
3.21.8 hz
4. 2.18x^10-15 hz
Which of the following is the most effective relaxation technique?
A.
It varies from person to person.
B.
Deep breathing
C.
Eating right
D.
Exercising
Answer:
A
Explanation:
It varies from person to person.
Answer:
A.
It varies from person to person.
Explanation:
i just look the test
Does an apple, potato, and onion all taste the same if you eat them with your nose plugged?
A.) Yes
B.) No
Answer: A yes
Explanation:
Answer:
A) Yes
Explanation:
Majority of what we perceive as "taste" is actually due to our sense of smell.
If we remove the contribution of smell by plugging your nose, many people have reported that apples, potatoes and onions indeed do "taste" the same.
If you sit close to a campfire, the fire warms you. Describe how thermal energy is transferred from the fire to you.
Answer:
Explanation:
When you sit by a campfire, most of the heat you are receiving from the fire does not come from hot air. ... This radiation carries energy which is converted to heat when it hits another object and is absorbed. In contrast, conduction involves the direct movement of heat through an object.
Answer:
When you sit by a campfire, most of the heat you are receiving from the fire does not come from hot air. ... This radiation carries energy which is converted to heat when it hits another object and is absorbed. In contrast, conduction involves the direct movement of heat through an object.
Explanation:
hope this helps u stay safe
The wings of a honeybee move at a frequency of 220 Hz. What is the period for a complete wing-beat cycle?
Answer:
0.0045 s
Explanation:
Period = 1 / frequency
T = 1 / (220 Hz)
T = 0.0045 s
If 400j of work is done on an object in 8 seconds, how much power does the object experience?
50w
45W
60W
408
Answer:
50w
Explanation:
Power is equal to Energy divided by Time
∆E/t
Answer:
50 W
Explanation:
Power can be found using the following formula.
p=w/t
where w is work and t is time.
400 Joules of work is done on the object in 8 seconds. Therefore,
w= 400 J
t= 8 s
Substitute these values into the formula.
p=400 J/ 8 s
Divide 400 by 8
p=50 J/s
Add appropriate units. In this case, power uses Watts, or W. (1 Joule per second, or J/s is equal to 1 Watt, or W)
p= 50 W
The object experiences 50 Watts of power
Help||| When a stringed instrument is out of tune, the player with tighten or loosen the string. If the instrument is initially flat, should they tighten or loosen the string? In the context of this experiment, explain your reasoning.
Answer:
So if its regular, you would always tighten it. Here's the reasoning:
"When you lower the pitch by releasing tension, there might be slack in the gears in the tuning machines, which might make the string go below the intended pitch. By going further down and approaching the target note from below, there will be force applied to the gears and when you've reached the correct pitch the gears have less potential to move. So your teacher is correct."
Therefore the answer is TighteningAnswer: So if its regular, you would always tighten it. Here's the reasoning: "When you lower the pitch by releasing tension, there might be slack in the gears in the tuning machines, which might make the string go below the intended pitch.
Explanation:
"When you lower the pitch by releasing tension, there might be slack in the gears in the tuning machines, which might make the string go below the intended pitch. By going further down and approaching the target note from below, there will be force applied to the gears and when you've reached the correct pitch the gears have less potential to move. So your teacher is correct."