Answer:
It is a weighted average of the masses of an element’s isotopes.
Explanation:
The best definition of the atom mass of an element is that it is a weighted average of the masses of an element's isotopes.
Isotopes of an element have the same electronic configuration but differ in only their masses. The atomic mass of an element can be derived from the geonormal abundances of this isotopes. It is the average of all the isotopes of an element.Atomic mass = ∑m[tex]_{i}[/tex] a[tex]_{i}[/tex]
where m[tex]_{i}[/tex] is the mass of the isotope i
a[tex]_{i}[/tex] is the abundance of the isotope i
A movie director creates a scene in which people on Spaceship #1 can see approach of Spaceship #2 and hear its engines. The director
hires a scientist to review the scene.
What should the scientist tell the director?
A .The scene needs no changes because light and sound waves can both travel through space.
B. The scene needs changes because neither light waves nor sound waves can travel through space.
C. The scene needs changes because sound waves can travel through space, but light waves cannot.
D. The scene needs changes because light waves can travel through space, but sound waves cannot.
A,B,C or D plz answer !
Answer:
It is D.
Explanation:
Sound travels by the movement of particles bumping against each other and if there is no particles in a vacuum(space) then there is no sound. Light can travel through space because it doesn't need to travel by/through particles.
Power is measured in which unit?
joules
O watts
O meters per second
O newtons per meter
Answer:
Power is measured in Watts
How far does light travel in 13 s?
Answer:
2,421,666 miles
Explanation:
light travels 186,282 miles per second in a vaccum.
So 186,282 × 13 = 2,421,666
Somebody plz answer these easy questions correct thx!!!
(WILL MARK BRAINLIEST)
:D
Answer:
6. Dolphins have two nasal passages
7. In a whale flipper there are:
Limbs: Cetacean flippers have the same bones as the forelimbs of other mammals. The humerus, radius, ulna, carpals, metacarpals and phalanges are all present. However, in cetaceans the radius and ulna (forearm) and humerus (upper arm) are fused.
Hope this helps! :D
Answer:
they have 2 nasal passages
Where does the energy in the explosion of a firecracker come from?
Answer:
The firecracker has chemical potential energy that is released when it is ignited.
Explanation:
What is the average speed of the boat between 4 and 6 minutes?
Answer:
[tex] the \: average \: speed \: of \: the \: boat \: between \: 4 \: and \: 6 \: \\ minutes \: = \frac{1000 - 500}{6 - 4} = \frac{500}{2} = 250[/tex]
note: cant really see the measuring units for clear unit for the value, however the average speed is 250 meter/mins, from observation.
what is the difference between a parallel connection and series connection
Answer:
here lol
Explanation:
Answer:
when the connection of the batteries is parallel negative to negative n positive to positive is called parallel connection
Explanation:
The minimum resultant of two forces of 20N and 5N is:
a) 10N
b) 5N
c) 20N
d) 25N
Answer:
if it's combined forces then it would be 25N if it was an unbalanced force then it would be 15N
How are gravity and air resistance alike? How are they different?
Answer:
kid
Explanation:
Erica tells Michael she is 160 centimeters tall, while Michael says he is 70 inches tall. If there are 2.54 centimeters in an inch, whos taller?
Answer:
Michael
Explanation:
160cm = 62.9921 inches
70in > 63in
A mortar shell is accidentally shot straight up with an initial speed of 147 m/s. How long does it take for the shell to reach its maximum height? How high does the shell rise? If the shell falls straight down after is stops, what is its velocity when it hits the ground? What is the total time the shell is in the air?
Answer:
1) t ≈ 14.985 seconds
2) The maximum height reached ≈ 1101.4 meters
3) The velocity with which it hits the ground = 147 m/s
4) The total time in the air ≈ 29.969 seconds
Explanation:
1) The given information are;
The initial velocity of the mortar shell = 147 m/s
The direction of the mortar shell = Vertically upwards
Therefore, we have, from the equation of motion
v = u - g·t
Where;
v = The final velocity = 0 at maximum height
u = The initial velocity = 147 m/s
g = The acceleration due to gravity = 9.81 m/s²
Therefore, we have;
0 = 147 - 9.81 × t
9.81 × t = 147
t = 147/9.81 ≈ 14.985 seconds
t ≈ 14.985 seconds
2) From the equation of motion, v² = u² - 2×g×s
Where;
s = The maximum height reached
We have;
0² = 147² - 2×9.81×s
2×9.81×s = 147²
s = 147²/(2×9.81) ≈ 1101.4 meters
The maximum height reached ≈ 1101.4 meters
3) The velocity with which it hits the ground is equal to the initial velocity = 147 m/s
4) The total time in the air = 2 × The time it takes to reach maximum height
The total time in the air = 2 × 14.985 ≈ 29.969 seconds
The total time in the air ≈ 29.969 seconds
An object with a mass of 2000 g accelerates 8.3 m/s2 when an unknown force is applied to it. What is the amount of the force?
Answer:
16.6 kg.m/sec^2
Explanation:
force law is mass times acceleration
HELP ASAP am being timed will brain crown mark!
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Two descriptions about physical quantities are given below:
Quantity A: It remains constant.
Quantity B: It depends on gravitational pull.
What quantities are these most likely describing?
Both Quantity A and Quantity B are mass.
Both Quantity A and Quantity B are weight.
Quantity A is weight and Quantity B is mass.
Quantity A is mass and Quantity B is weight.
Answer:
The answer is D.
Explanation:
This is because mass always remains constant and weight is dependent on a gravitational pull.
1. Explain a stretching routine for your work environment. As you consider your routine, keep in mind the specific individuals within your work environment who will be using this plan. How will you account for differences in sizes, ages, and cultures?
Answer:
Explanation:
A stretching routine should target most of the main muscles in the body and at least one stretching exercise per section of the body. Also in a work environment since individual's sizes, ages, and cultures vary you should design a routine that is for beginners and very easy and effective. Regardless, each individual should be able to move at their own pace and push as far as they are physically able. One such routine would be the one in the attached picture below which targets all major areas, is easy and effective. It starts at the neck muscles and works its way down the arms, back, and legs.
Calculate the work done by the cyclist when his power output is 200 W for 1800 seconds.
Answer:
3.6 × 10^5 J
Explanation:
Work Done = Energy
Energy = Power × time
Energy = 200 × 1800
= 360000 J
W =
[tex]3.6 \times 10 {}^{5} j[/tex]
What is the process called when heat is added to a liquid? What does the liquid become?
Answer:
evaporation
Explanation:
when the liquid is heated it evaporates until it becomes air
Light travels slower in oil than in air. If a light wave moves through the oil at a speed of 2 x 108 m/s and the wavelength of this light wave is 2 x 10-3 m, what is the frequency of this wave?
1 x 105 Hz
4 x 10-24 Hz
4 x 105 Hz
1 x 1011 Hz
The frequency of this wave will be 1 × 10¹¹ Hz. Option d is correct. Frequency is the inverse of the time period.
What is the frequency?Frequency is defined as the number of repetitions of a wave occurring waves in 1 second.
The given data in the problem is;
v is the speed of light = 2 x 10⁸ m/s
[tex]\lambda[/tex] is the wavelength = 2 x 10⁻³ m,
f is the frequency of the wave is to be found;
Frequency is given by the formula as,
[tex]\rm v = \lambda \times f \\\\\ \rm f = \frac{v}{\lambda} \\\\ \rm f = \frac{2 \times 10^8}{2 \times 10^-3} \\\\ \rm f = 1 \times 10^{11} \ Hz[/tex]
Hence the frequency of this wave will be 1 × 10¹¹ Hz. Option d is correct.
To learn more about the frequency reference the link;
https://brainly.com/question/14926605
least massive metalloid of period 4
Answer:
It is Germanium(Ge)
Explanation:
Which factor affects the speed of a wave?
A. medium the wave travels through
B. reflection of the wave
C. transmission of the wave
D. amplitude of the wave
A heavy log will float on water
because:
A. It is less dense than water
B. It weighs less than water
C. It is more dense than water
D. It weighs more than water
Answer:
A it is less dense than water
Explanation:
The density, of a substance is its mass per unit volume
PLZ HELP SOMEONE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! what is badminton drops??????????????????????????????????????
Answer:
A drop shot is the badminton shot that you perform when you are in the back of your court and you hit the birdie so it lands in the front part of your opponent's side
Explanation:
A sound wave ________ and ______ the air molecules around your ear.
Group of answer choices
moves and shakes
compresses, expands
vibrates and heats up
Answer:
compresses and expands
Answer:
compreses and expands
Explanation:
because it is
why do people have a virgna
Answer: For many things, like reproduction and releasing bad bacteria.
Explanation: We all have our parts, but what’s most important is our private parts. It helps us to use the restroom, and release the bad bacteria, without it, we’d die from holding it in! But also, it helps the world grow, because to reproduce we need those parts.
PLEASE HELP!!!! WILL MARK BRAINLEST!!
For a moving object, the force acting on the object varies directly with the object's acceleration. When a force of 25 N acts on a certain object, the acceleration of the object is 5 /ms2. If the force is changed to 40 N, what will be the acceleration of the object?
Answer:
3
Explanation:
the change in velocity is 15, and if I'm right which I may not be you divide your change in velocity by your speed being 5 and get 3. i googled the equation to find acceleration and found a = v/t. this could be absolutely wrong but I hope it helps
39.Explain the working mechanism of a mercury barometer.
A place with a tropical climate would most likely be located (1 point)
a. near the equator
b. at high altitudes
c. near the poles
d. in the middle of a continent
Answer:
near the equator
Explanation:
the equator is at the center of both hemispheres, and gets the most direct sunlight year round. Therefore, it would be the most tropical.
A hockey puck sliding on a frozen lake comes
to rest after traveling 176 m.
If its initial velocity is 2.3 m/s, what is its
acceleration
Given parameters:
Distance traveled = 176m
Initial velocity = 2.3m/s
Unknown:
Acceleration = ?
Solution:
Acceleration is the change in velocity with time. To solve this problem, we apply one of the motion equations;
V² = U² + 2as
where V is the final velocity
U is the initial velocity
a is the acceleration
s is the distance
final velocity is 0;
0² = 2.3² + 2 x a x 176
-5.29 = 352a
a = - [tex]\frac{5.29}{352}[/tex] = - 0.015m/s²
What is the speed of a snail moving at a rate of 3 inches per minute in [m/s]? Recall that 1 [m] = 39 [in]. Round to the nearest ten thousandth (4 places after the decimal).
Answer:
0.0013 m/s
Explanation:
Speed in inches per minute = 3 inches per minute
Speed in m/s =?
Next, we shall convert 3 inches per minute (3 in/min) to metre per minute.(m/min)
39 in/min = 1 m/min
Therefore,
3 in/min = 3 in/min × 1 m/min / 39 in/min
3 in/min = 1/13 m/min
Finally, we shall convert 1/13 m/min to m/s. This can be obtained as follow:
1 m/min = 1/60 m/s
Therefore,
1/13 m/min = 1/13 m/min × 1/60 m/s / 1 m/min
1/13 m/min = 1/780 m/s
1/13 m/min = 0.0013 m/s
Thus, 3 in/min is equivalent to 0.0013 m/s.
Therefore the speed of the snail in m/s is 0.0013 m/s
I need help lease. I will mark you brainliest
Answer: 43.5
and now I'm typing cause it said the answer had to be at least 20 characters
Find the magnitude and direction of the net gravitational force on mass A due to masses B and
C in the figure. Each mass is 2 kg.
a. 2.8x10^-8N, to the right
b. 2.54x10^-8N, to the right
c. 3.4x10^-8N, to the left
d. 3.4x10^-8N, to the right
Answer is A 2.8 x 10^-8 N, to the right
The net gravitational force on mass A due to masses B and C is required.
The correct option is a. [tex]2.8\times 10^{-8}\ \text{N}[/tex] to the right.
G = Gravitational constant = [tex]6.674\times 10^{-11}\ \text{Nm}^2/\text{kg}^2[/tex]
[tex]r_{AB}[/tex] = Distance between A and B = 0.4+0.1 = 0.5 m
[tex]r_{AC}[/tex] = Distance between A and C = 0.1 m
[tex]m_A=m_B=m_c[/tex] = Mass of each particle = 2 kg
The required force is
[tex]F_A=F_{AB}+F_{AC}\\ =\dfrac{Gm_Am_B}{r_{AB}^2}+\dfrac{Gm_Am_C}{r_{AC}^2}\\ =Gm^2\left(\dfrac{1}{r_{AB}^2}+\dfrac{1}{r_{AC}^2}\right)\\ =6.674\times 10^{-11}\times 2^2\left(\dfrac{1}{0.5^2}+\dfrac{1}{0.1^2}\right)\\ =2.8\times 10^{-8}\ \text{N}[/tex]
The magnitude of force will be [tex]2.8\times 10^{-8}\ \text{N}[/tex]
The direction will be towards the right since C is closer to A.
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