Answer:Answer:
They are inhaled or eaten
Explanation:
Radioactivity can be defined as the process in which an unstable atomic nucleus spontaneously emits ionizing radiation and charge particles. This eventually results in the formation of an energetically stable atomic nucleus.
Examples of radioactive elements are Uranium, Polonium, Thorium, Radon, etc. The radiation emitted during this process is classified as;
1. Alpha radiation (α).
2. Beta radiation (β).
3. Gamma radiation (G).
Alpha-emitting substances, such as radon gas, can be a serious health hazard only if they are inhaled or eaten. Alpha-emitting substances compared to other radiation has very short-range particle and as such cannot penetrate the human skin or body.
What is the frequency of a wave if 10 waves go past in 1 second ?
Answer:
f = 10 Hz
Explanation:
We need to find the frequency of a wave if 10 waves go past in 1 second. Total number of waves per unit time is called frequency. So,
[tex]f=\dfrac{10}{1}=10\ Hz[/tex]
So, the frequency of a wave is 10 Hz.
What is the SI unit used to measure force?
Newton
Meter
Pascal
Joule
Answer:
newton(N)
Explanation:
Gold has a density of 19300 kg/m³. Calculate the mass of 0.02 m³ of gold in kilograms.
Answer:
Mass = 386 kg
Explanation:
Density = Mass / Volume
Mass = Density × Volume
Where D = 19300 kg/m³ , V = 0.02 m³
Putting the given in the above formula
Mass = 19300 × 0.02
Mass = 386 kg
Answer:
386 kg
Explanation:
mass = density * volume
= 19300 * 0.02
= 386 kg
Hope this helps!
The sputnik one satellite orbiting earth mass equals 5.98×10 to the 24th power kilograms in a circle of radius 6.96×10 to the six power meters what was its orbital velocity
Answer:
7572 m/s
Explanation:
The force between two masses separated by a distance r is given as:
[tex]F=G\frac{m_1m_2}{r^2}[/tex]
Where F is the attractive force between 2 masses, m1 and m2, r is the distance between the centres of the masses and G is the universal gravitation constant, which is [tex]6.674*10^-11 Nm^2/kg^2[/tex]
The mass of the earth ([tex]m_1[/tex]) is far greater than the mass of the sputnik ([tex]m_2[/tex]). Therefore [tex]m_1m_2=m_1[/tex]. The mass of the sputnik is neglected, therefore:
[tex]F=G\frac{m_1}{r^2}=\frac{(6.674*10^{-11})(5.98*10^{24})}{(6.96*10^6)^2} = 8.2389N[/tex]
But F is actually centripetal acceleration, a = v²/r
[tex]8.2389 = v^2 / 6.96*10^6\\v=7572m/s[/tex]
An 82 kg jogger has 810 J of kinetic energy. What is the jogger’s velocity? 4.4 m/s 9.9 m/s 19 m/s
Answer:
4.4 m/s
Explanation:
KE = ½ mv²
810 J = ½ (82 kg) v²
v = 4.4 m/s
Answer:
4.4
Explanation:
got right on edg
Which object has more gravitational potential energy
Answer:
need more context
Explanation:
Answer:
EL QUE TENGA MÁS MASA Y MÁS ALTURA.
Explanation:
Which is a characteristic of all waves?
All waves carry energy.
All waves move through space.
All waves move through matter, from particle to particle.
All waves transfer energy parallel to the direction of wave mo
Answer:à
Explanation:waves carry energy in the direction in which they move
Characteristics of all waves:
All waves carry energy.
All waves move through space.
All waves move through matter, from particle to particle.
All waves transfer energy parallel to the direction of wave mo tion.
If the distance is halved and the charges of both particles are doubled, the force is ________ as great.
Answer:
The new force is 16 times of the initial force.
Explanation:
The electric force between charges is given by :
[tex]F=\dfrac{kq_1q_2}{r^2}[/tex]
If the distance is halved, d' =d/2 and charges are doubles, [tex]q_1'=2q_1\ \text{and}\ q_2'=2q_2[/tex]
New force becomes,
[tex]F'=\dfrac{kq_1'q_2'}{r'^2}\\\\F'=\dfrac{k(2q_1)(2q_2)}{(d/2)^2}\\\\F'=16\times \dfrac{kq_1q_2}{r^2}\\\\F'=16F[/tex]
So, the new force is 16 times of the initial force.
If the distance is halved and the charges of both particles are doubled, the force is 16 times as great.
Coulomb's LawAccording to Coulomb's law, the electrostatic force between two charges is given by;
[tex]F=k\frac{q_1 q_2}{r^2}[/tex]
Where 'k' is the Coulomb's constant.
If the charges of both particles are doubled and the distance is halved, the new force will be;
[tex]F\,'=k\frac{2q_1 \times 2q_2}{(r/2)^2}=k \frac{4\times 4\times q_1 q_2}{r^2} =16\,F[/tex]
So, the new force will be 16 times greater than the old force.
Learn more about Coulomb's law here:
https://brainly.com/question/14049417
Pleasssseeee helpppp i will mark brainlest
Answer:
the second and the third
Explanation:
the maximum daylight hours is the second, and the warmest temperatures for the northem hemisphere.
A 2.0 g ball with a +0.05 C charge is moved from the negative plate to the positive plate, and then is released. The potential difference between the plates is 12.0V. When the ball strikes the (–) plate its velocity is most nearly equal to
Answer:
24.5 m/s
Explanation:
Since the work done by the electric field on the charge equals the kinetic energy of the ball, then
qV = 1/2mv²
and v = √(2qV/m)
where q = charge = + 0.05 C, V = potential difference = 12.0 V, m = mass of ball = 2.0 g = 0.002 kg
Substituting the values into v, we have
v = √(2 × + 0.05 C × 12.0 V/0.002 kg)
= √(1.2 CV/.002 kg)
= √(600 CV/kg)
= 24.5 m/s
Compare and contrast speed, velocity, and acceleration. Why do their differences matter?
Answer:
Speed is a scalar quantity, that is, it is a number and indicates how fast (or slow) one travels at any given time.
Velocity is a vector quantity, this means that it has magnitude and direction, that is, how fast an object travels and its where its going (speed + the direction in which the object moves).
Acceleration is the ratio of the velocity change over the time interval in which this velocity change occurred. Acceleration as well as velocity is a vector quantity so it is made up of magnitude and direction.
The differences between these three quantities are important for the description of the movement. In the case of speed and velocity, its difference lies in the fact that velocity indicates the direction in which the movement is taking place (and speed is only a number), which in many physical phenomena the direction of movement is an important property. And the difference between acceleration and velocity is that acceleration instead of a velocity indicates a change in velocity (either in magnitude, direction or both), which tells us how fast a velocity will increase or decrease over time.
state newtons second law of motion from the equation f: ma
Newton's Second Law of Motion states "The rate of change of momentum of a body is directly proportional to the applied unbalanced force in the direction of force".
when a body of mass 0.25kg is acted upon by a force, the velocity changes from 5m/s to 7.5m/s. Calculate the work done by the force
Answer:
Work done by the force = 1/2m×(v2 - v1)²
m = mass
v2 = final velocity
v1 = initial velocity
= 1/2(0.25)(7.5-5)²
= 1/2(0.25)(2.5)²
= 1/2(0.25)(6.25)
= 0.78J
Hope this helps.
if a ray of light is incident on plane mirror at an angle of 300 its angle of reflection is.
Answer:
300°
Explanation:
both the angles of incidence and reflection are the same
The image shows a man on a cliff. What type of energy does he possess?
1 point
Answer:
potential energy
Explanation:
if it takes 20 n to move an object 20m how much work was done
Answer:
[tex]\boxed{Work \: done = 400 \: N-m}[/tex]
Explanation:
Force = 20 N
Displacement =20 m
Work Done = Force × Displacement
= 20 × 20
= 400 N-m
What change occurs to the gravitational force of attraction between two bodies when the
distance between them is made half (1/2) by keeping masses constant?
Answer:
when the radius is halved, F becomes 4 times
Explanation:
The formula is given by
[tex]F = \frac{Gm1m2}{r^2}[/tex]
When r is halved:
[tex]F = \frac{Gm1m2}{(1/2r)^2}[/tex]
=> [tex]F = \frac{Gm1m2}{1/4 r^2}[/tex]
=> [tex]F = 4(\frac{Gm1m2}{r^2} )[/tex]
This means when the radius is halved, F becomes 4 times
Answer!!!!!!!!!!!!!!!!!!!!
Acceleration =change in velocity÷Time taken
or, Acceleration =final velocity-Initial velocity÷Time taken
or, a=v-u÷t
or, at=v-u
or, v-u=at
therefore, v=u+at
Write a statement about your understanding of how momentum is conserved during a collision
Question 1: A man trailing a trolley bag and suddenly, the wheels of the trolley bag get locked. The man realises that he has to put extra effort to drag the bag. The man finds it difficult to drag the bag because
Answer: Because of the friction force acting directly on the bag.
Explanation:
The function of the wheels is diminish the effect of the friction force, when the friction pulls back, it makes the wheel rotate, and this force is not applied directly on the bag.
Now the wheels are not working, so now the friction is acting directly on the bag, this is why the mand finds more difficult to drag the bag.
A body of mass 1kg has a 25kgsmsqure moment of inertia about its center of mass. if it rotated about an axis which has a displacement (5,12)m, its moment of inertia about this axis becomes
Answer:
194 kg m²
Explanation:
Use parallel axis theorem:
I = I₀ + mr²
I = 25 kg m² + (1 kg) ((5 m)² + (12 m)²)
I = 25 kg m² + 169 kg m²
I = 194 kg m²
3.
A body starts moving from rest and attains the acceleration of 0.5 m/s2. Calculate the
velocity at the end of 3 minutes and also find the distance travelled by it during that
time.
Answer:
90 m/s
8100 m
Explanation:
Given:
v₀ = 0 m/s
a = 0.5 m/s²
t = 3 min = 180 s
Find: v and Δx
v = at + v₀
v = (0.5 m/s²) (180 s) + 0 m/s
v = 90 m/s
Δx = v₀ t + ½ at²
Δx = (0 m/s) (180 s) + ½ (0.5 m/s²) (180 s)²
Δx = 8100 m
An atom of xenon has a mass number of 127 amu. How many neutrons
does it contain? *
Answer:
73 neutrons.
Explanation:
Data obtained from the question:
Mass number of Xenon = 127.
Neutron number =...?
We can obtain the number of neutron present as follow:
Atomic number of Xenon = 54
Recall:
Atomic number = proton number = 54
Mass number = proton + neutron
127 = 54 + Neutron
Neutron = 127 – 54
Neutron = 73.
Therefore, 73 neutrons are present in the Xenon atom.
A car travels 20 miles in 1 hour 15 minutes. What is its average speed
If a car travels 20 miles in 1 hour and 15 minutes, then the average speed of the car would be 7.15 meters/second.
What is speed?The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object.
As given in the problem, if a car travels 20 miles in 1 hour and 15 minutes, then we have to find the average speed of the car,
1 mile = 1609 meters
20 miles = 20*1609 meters
= 32180 meters
1 hour = 3600 seconds
1 minutes = 60 seconds
15 minutes = 15*60
=900 seconds
1 hour and 15 minutes = 4500 seconds
The average speed of the car = The distance traveled by car/time
= 32180 meters / 4500 seconds
= 7.15 meters / seconds
Thus, the average speed of the car would be 7.15 meters/second.
To learn more about speed from here, refer to the link;
brainly.com/question/7359669
#SPJ2
which atomic particle has no charge?
A. Electron
B. Neutron
C. Nucleus
D. Proton
Answer:
B. Neutron has no charge
Answer:
B. Neutron
Explanation:
Firstly, the nucleus is what contains the protons and electrons, so it is not an atomic particle. The electron has a negative charge, and the proton has a positive charge (you can remember this by looking at its prefix 'pro'). This means the neutron has no charge (think of it as neutral).
Date
Page
710
Amachine raises a load of 750N
through a height
of 16m in 5 sec
calculate
a) work done by machine
b) Power of machine
Answer:
W=F×H,Power=W/Time
Explanation:
W=Force ×Height
750N×16 =12000
Power=Work/Time
12000/5=2400J
Please Hurry!! This is very simple!
What are your thoughts about the connection between exercise and memory? How often do you exercise? Do you exercise more or less now that you are no longer on campus? Is that a good or bad thing? Why?
Answer:
What are your thoughts about the connection between exercise and memory?
I think its important to memorize how much u work out and exersize. make sure u dont do it too much or u might pass out. keep track of ur health by memorizing what u ate and when u ate before doing a lot of movement. you might throw up. Exercising is obviously very important for your body.
How often do you exercise?
5 times a week. (5/7 days)
Do you exercise more or less now that you are no longer on campus? Is that a good or bad thing?
A little less. But i think its a good thing
Why?
I used to go to a gym near campus! But now some are a little farther but during this time of quarantine, i work out at home and do the basics like running and agility. I think its good because it teaches me the exercising i can do at home instead of getting memberships and using my money. now i can spend money wisely and still exersize.
Mark as brainliest!
hope this helps! :)
make any changes if ud like
Explanation:
Dynamo converts the
a》mechanical energy into electrical energy
b》chemical energy into electrical energy
c》heat energy into electrical energy
d》none of the above
Answer:
[tex] \gamma \: dynamo \: converts \: the \: mechanical \: energy \: into \: electrical \: energy \: .[/tex]
Explanation:
Hope it helps you :)))
Answer:
.
Explanation:
A 38.5 kg man is in an elevator
accelerating downward. A normal
force of 343 N pushes up on him.
What is his acceleration?
Answer:
F = m*(g - a) →
a = g - F/m = 0.891 m/s² downward
Explanation:
If elevator was stationary, the normal force of elevator floor on man* would be = mg
mg = (38.5)(9.81) ≈ 378 N.
If elevator is accelerating downward the floor is accelerating away from man and so the normal force will be less than man's weight by: 378 - 343 = 35 N.
Hope this helps.
Answer:
-0.891
Explanation:
negative because downward
Calculate the amount of energy transferred when a 40w light bulb is left on for 30 minutes.
Answer:
E=72000J or 72kj
Explanation:
The formula is E=pt you need to convert your t from minutes to seconds before proceeding