Answer: The mass of 0.5 mole of element ab is 81.67 g.
Explanation:
According to the mole concept, 1 mole of a substance contains [tex]6.022 \times 10^{22}[/tex]. As, the mass of [tex]2 \times 10^{21}[/tex] atoms is 0.49 g.
So, [tex]\frac{2 \times 10^{21}}{6.022 \times 10^{23}} mol = 0.49 g[/tex]
[tex]0.003 mol = 0.49 g[/tex]
Therefore, mass of 1 mole = [tex]\frac{0.49}{0.003}[/tex]
= 163.33 g/mol
Hence, mass of 0.5 mole of ab element is calculated as follows.
[tex]0.5 mol \times 163.33 g/mol[/tex]
= 81.67 g
Therefore, the mass of 0.5 mole of element ab is 81.67 g.
Density of water 1000kgper m^3 What will be the volume of 3500
kg water
Answer:
The volume of water is 3.5 cubic meter
Explanation:
Density
The density of a substance or material is the mass per unit volume. The density varies with temperature and pressure.
The formula to calculate the density of a substance of mass (m) and volume (V) is:
[tex]\displaystyle \rho=\frac{m}{V}[/tex]
We are given the density of water as [tex]\rho=1,000\ kg/m^3[/tex].It's required to find the volume of m=3,500 kg of water. Solving for V:
[tex]\displaystyle V=\frac{m}{\rho}[/tex]
[tex]\displaystyle V=\frac{3,500}{1,000}[/tex]
[tex]V=3.5\ m^3[/tex]
The volume of water is 3.5 cubic meter
Name the two poles of a magnet
What is meant by magnetism?
The _____ deflects these winds to the right in the northern hemisphere and to the Southern Hemisphere
Answer:
Coriolis Effect
Explanation:
The Coriolis effect is responsible for the deflection of winds to the right in the Northern hemisphere and to the right in the Southern hemisphere. It is an effect that occurs because of the rotation of the earth around its axis.
The implication of this is that in areas of low pressure in the Northern hemisphere, winds tend to blow in anticlockwise direction, and in areas of high pressure, it blows in a clockwise direction. The opposite of this happens in the Southern hemisphere.
What is its rotational inertia about the meter stick in the
previous question if it is swung in a circle about one of its
ends?
STICK ABOUT
END
I= '3 mL?
Answer:
Honestly I cant understand that so please explain it someone
Explanation:
Help me with this homework
Answer:
4. The reading decreases because part of your weight is applied to the table and the table exerts a matching force on you that acts in the direction opposite to your weight.
Explanation:
When you push on anything, Newtons Third Law comes into effect: "when two objects interact, they apply forces to each other of equal magnitude and opposite direction." So pretty much, the table you are putting some of your weight on is taking some of the downward force and in return the scale isn't going to push up with as much force.
I'm not the best at explaining, but im in physics right now and thats somewhat how my teacher explained it.
Which action is not an example of work?
picking up a box off the floor
pushing a box across the floor
holding a tray in the cafeteria line
raising a barbell over your head
Answer:
option 3
Explanation:
work is said to be the ability to move an object from it initial position. therefore, holding a tray is not a work
Answer:
C
Explanation:
What is the difference in
momentum between an 87.2 kg
football player running 2.87 m/s and
a 0.0520 kg bullet moving 789 m/s?
209.236 kg · m/s
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightPhysics
Momentum
Momentum Formula: P = mv
P is momentum (in kg · m/s)m is mass (in kg)v is velocity (in m/s)Explanation:Step 1: Define
m₁ = 87.2 kg
v₁ = 2.87 m/s
m₂ = 0.0520 kg
v₂ = 789 m/s
Step 2: Find Momentums
Football Player
Substitute [MF]: P = (87.2 kg)(2.87 m/s)Multiply: P = 250.264 kg · m/sBullet
Substitute [MF]: P = (0.0520 kg)(789 m/s)Multiply: P = 41.028 kg · m/sStep 3: Find difference
Define equation: P₁ - P₂Substitute: 250.264 kg · m/s - 41.028 kg · m/sSubtract: 209.236 kg · m/sAnswer:
209.236
Explanation:
Order of Operations: PEMDAS
"Please excuse my dear Aunt Sally"
Parentheses, exponents, multiplication, division, addition and subtraction
First use p=mv
Player:(plug in the data)
= 87.2*2.87
= 250.264
Bullet : (do the same)
Then subtract Bullet-Player =209.236
What is the difference between liquid water and water vapor?
A.) They have different arrangements of atoms in their molecules.
B.) They differ in their number and types of atoms.
C.) They are different states of the same pure substance.
D.) They are different types of chemical compounds.
Answer:
C
Explanation: Water vapor can turn into liquid water when it cools and Liquid water turns into vapor when it heats
Lauren is comparing rocks from two different locations. She has the following
information about the rocks:
Rock A formed from small pieces of rock.
Rock B formed from liquid rock in a different place.
Rocks A and B formed at about the same time.
Are Rocks A and B the same or different types of rock?
.
The rocks are
Answer:
the same type because they both formed from rock material.
Explanation:
The rocks which are formed from small pieces of rocks are called sedimentary rocks whereas, the rocks formed from the liquid rocks or molten fluid rock, they are called igneous rocks. Hence, A rock A and B are of different types.
What is sedimentary rocks?There are broadly three types of rocks namely sedimentary rocks , igneous rocks and metamorphic rocks. These rocks can be interchanged to another forms through the process called rock cycle.
Sedimentary rocks are formed near the earth surface and which are deep within the earth. Sedimentary rocks are composed many small pieces of rocks. Thus the rock A is sedimentary rock.
Igneous rocks are formed by the crystallization of molten magma after cooling. These magma are developed underground in the upper mantle. Magma becomes hot by the convection current and it flow making the nearby plates to move. When it cools, it solidifies to form igneous rocks. Thus, rock B is igneous type.
To find more on igneous rocks, refer here:
https://brainly.com/question/23555197
#SPJ5
Which of the following describes a displacement vs. time graph that looks like this?
A)Increasing Velocity
B)Constant Velocity
C)Constant Non-Zero Acceleration
D)Decreasing Acceleration
constant non zero acceleration
A car with a mass of 833 kg rounds an unbanked curve in the road at a speed of 28.0 m/s. If the
radius of the curve is 105 m, what is the centripetal force exerted on the car?
A Go Kart (m = 35 kg) has a top speed of 12 m/s . A student traveling at top speed locks the brake to avoid hitting a bus after school, skidding 7.2 meters before stopping. How much force did the Go Kart have when the student locked the brake?
Answer:
350 N
Explanation:
From the question given above, the following data were obtained:
Mass (m) of Go Kart = 35 kg
Initial velocity (u) = 12 m/s
Distance (s) = 7.2 m
Force (F) =?
Next, we shall determine the acceleration of the Go Kart. This can be obtained as follow:
Initial velocity (u) = 12 m/s
Distance (s) = 7.2 m
Final velocity (v) = 0 m/s
Acceleration (a) =.?
v² = u² + 2as
0² = 12² + (2 × a × 7.2)
0 = 144 + 14.4a
Collect like terms
0 – 144 = 14.4a
– 144 = 14.4a
Divide both side by 14.4
a = – 144 / 14.4
a = – 10 m/s²
The negative sign indicate that the Go Kart is decelerating when the brake was applied.
Finally, we shall determine the force the Go Kart have when the student locked the brake. This can be obtained as follow:
Mass (m) of Go Kart = 35 kg
Acceleration (a) = 10 m/s
Force (F) =?
F = ma
F = 35 × 10
F = 350 N
Thus, the Go Kart has a force of 350 N when the student locked the brake.
Why should a person warm up before physical activity?
Answer:
don't wanna pull anything
Explanation:
A good warm-up before a workout dilates your blood vessels, ensuring that your muscles are well supplied with oxygen. It also raises your muscles' temperature for optimal flexibility and efficiency. By slowly raising your heart rate, the warm-up also helps minimize stress on your heart.
Answer:
Here you go!
Explanation:
A good warm-up before a workout dilates your blood vessels, ensuring that your muscles are well supplied with oxygen. It also raises your muscles' temperature for optimal flexibility and efficiency. By slowly raising your heart rate, the warm-up also helps minimize stress on your heart. “Stretching allows for greater range of motion and eases the stress on the joints and tendons, which could potentially prevent injury. Warming up, such as low-heart rate cardio, prepares the circulatory and respiratory system for the upcoming ‘age- and type-appropriate target heart rate’ exercising, whether it’s endurance or sprint type of activities.” The cool-down is just as critical. It keeps the blood flowing throughout the body. Stopping suddenly can cause light-headedness because your heart rate and blood pressure drop rapidly. Before you exercise, think about warming up your muscles like you would warm up your car. It increases the temperature and flexibility of your muscles, and helps you be more efficient and safer during your workout. A warm-up before moderate- or vigorous-intensity aerobic activity allows a gradual increase in heart rate and breathing at the start of the activity.
Tips:
*Warm up for 5 to 10 minutes. The more intense the activity, the longer the warm-up.
*Do whatever activity you plan on doing (running, walking, cycling, etc.) at a slower pace (jog, walk slowly).
*Use your entire body. For many people, walking on a treadmill and doing some modified bent-knee push-ups will suffice.
In incline plane makes an angle of 40° with the horizontal a body weighing 4000 N initial at rest moves down the slope calculate the distance travelled by the body in 5 seconds if the force of friction is 1500N
Answer:
45.375m
Explanation:
To get the distance travelled by the body we will use the equation of motion
S = ut + 1/2at²
u is the initial speed = 0m/s
a is the acceleration
t is the time = 5 seconds
We need to get the acceleration first:
According to Newton's second law,
[tex]\sum F_x = ma\\F_m - F_f = ma\\[/tex]
Fm is the moving force = Wsin theta
Ff is the frictional force = 1500N
m is the mass = W/g
m = 4000/9.8
m = 408.16kg
Substitute the given values in the formula and get the acceleration:
[tex]Wsin \theta - F_f = ma\\4000sin40^0 - 1500 = 408.16a\\2,980.45 - 1500 = 408.16a\\1,480.45 = 408.16a\\a = \frac{1,480.45}{408.16} \\a = 3.63m/s^2[/tex]
Get the required distance:
Recall that S = ut+1/2at²
S = 0(5) + 1/2*3.63*5²
S = 0+0.5*3.63*25
S = 45.375m
Hence the distance travelled by the body in 5 seconds if the force of friction is 1500N is 45.375m
An airplane is traveling from North Africa to England. Which arrow correctly shows the direction gravity pulls the plane?
(A) 1
(B) 2
(C) 3
(D) 4
Given that,
The attached figure shows an airplane is traveling from North Africa to England.
To find,
The arrow that shows the direction gravity pulls the plane.
Solution,
The force of gravity always acts in the downward direction, The weight of an object is given by :
W = mg
Arrow 2 shows the direction of gravitational pull.
Answer:
2 or B
Explanation:
True or false?
There is no
difference
between speed
and velocity
Answer:
False
Explanation:
Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object's movement.
If a crane lifts a load of 75N to a height of 20m in 100s, what is the power of the crane?
Answer:
P = 15 [W]
Explanation:
Power is defined as the relationship between work over a certain time.
In this way we must calculate the work which is defined as the product of force by distance.
[tex]W=F*d\\W=75*20\\W=1500[J][/tex]
And the power.
[tex]P=W/t\\P=1500/100\\P=15[W][/tex]
Power given in units of watts.
What is the resultant force acting on an object with an eastward force of
15 N and a northward force of 30 N?
Explanation:
15N in the north direction
4. Lead has a density of 11.5g/cm3. A rectangular block of lead measures 7cm ×5cm×2cm.
a) Find the volume of the block of lead.
b) Find the mass of the block of lead
Answer:
a.) volume = 70cm^3
b.) mass = 805 grams
Explanation:
see the explanation in attachment.
A car travels at a constant speed of 40 miles per hour down the street for around 0.25 hours. What is its acceleration?
Answer:
55
Explanation:
was moving at 25 miles per hour
Is this statement true or false?
There are SEVEN days between a NEW MOON and a FIRST QUARTER MOON.
If its false than how many days are between a new moon and a first quarter moon?
Answer:True
Explanation:there are approximately 29.531 on the new moon and and 7.31 I think for the first quarter then it’s 7 days between them if u calculate their sped that light travels and that number it might be the same but the statement is true not false
Answer:
The full cycle of moon phases averages 29.531 days. A quarter of that is 7.38 days. So "7 days" is a pretty good approximation for casual conversation. It's true.
Explanation:
uh i think that was my explanation soooooo like yall have a good day and if you are working at 1am just know it is not gonna be so hard one day it is gonna get better hehe
Which of these metals are magnetic?
Copper is not magnetic
Steel is magnetic
Nickel is magnetic
Tin is magnetic
Aluminum is not magnetic
A 30 kg dog runs at a speed of 15 m/s. What is the dog's kinetic energy (in jewels)? Round the answer to two significant digits.
Answer:
K.E = 3400 Joules.
Explanation:
Given the following data;
Mass = 30kg
Velocity = 15m/s
To find the kinetic energy;
Kinetic energy can be defined as an energy possessed by an object or body due to its motion.
Mathematically, kinetic energy is given by the formula;
[tex] K.E = \frac{1}{2}MV^{2}[/tex]
Where, K.E represents kinetic energy measured in Joules.
M represents mass measured in kilograms.
V represents velocity measured in metres per seconds square.
Substituting into the equation, we have;
[tex] K.E = \frac{1}{2}*30*15^{2}[/tex]
[tex] K.E = 15*225 [/tex]
K.E = 3375 Joules.
To two (2) significant digits, the kinetic energy of the dog is 3400 Joules.
what is wave interactions?
Answer:
Waves interact with matter in several ways. The interactions occur when waves pass from one medium to another. The types of interactions are reflection, refraction, and diffraction. Each type of interaction is described in detail below.
Hydrometer is a devise used to measure the volume of a liquid. *
True
False
Answer:
false
Explanation:
HELP!!
8. The speed that the car is going at an instant of time is called the (5 points)
average speed
final speed
initial speed
instantaneous speed
Answer:
the speed that the car is going at an instant of time is called the instantaneous speed.
the weight of a piece of stone when fully immersed in water is 18N and it displaces 4N of water. what is the weight of the stone in air?
Answer:
4N
Explanation:
Given parameters:
Weight of stone when immersed in water = 18N
Weight of water displaced = 4N
Unknown:
Weight of the stone in air = ?
Solution:
To solve this problem, we employ the Archimedes' principles.
It states that the upward buoyant force on a body is equal to the weight of the fluid displaced.
The weight of the water displaced is equal to the weight of the body.
So, the weight of the stone in air = 4N
Hardness, texture, color, and freezing point are all examples of what type of properties of matter?
A.) chemical
B.) positive
C.) physical
D.) negative
Answer:
physical
Explanation:
a meteroid is in a circular orbit 600 km above the surface of a distant planet. the planet has the same mass as Earth but has a radius that is 90% of Earths (where Earths radius is approximately 6370 km).
The acceleration of the meteroid due to the gravitational force exerted by the planet is most nearly
A) 9 m/s^2 toward the center of the planet
B) 9 m/s^2 in the direction of the meteoroids motion
C) 10 m/s^2 toward the center of the planet
D) 10 m/s^2 in the direction of the meteoroids motion
Answer:
C) 10 m/s^2 toward the center of the planet
Explanation:
g = GM/r^2
The masses of earth and this planet are the same and the radius is only diffferent by 10% so as gravitational force acceleration is 9.8m/s^2 on earth, it can be estimated to be around 10m/s^2.
Using the third law, we know acceleration is toward the larger mass from attraction, thus having it point toward the center of the planet.
If the distance between two objects is increased by a factor of 3 (tripled), how will this affect Fg?
1. F g increases by 9 times
2. F g decreases to 1/9
3. F g increases by 3 times
4. F g decreases to 1/3
Answer:
2. F g decreases to 1/9
Explanation:
The formula for calculating the Force of gravity between two masses separated by a distance is expressed as;
F = GMm/d² ... 1
If the distance is tripled, the new force will be;
F1 = GMm/(3d)²
F1 = GMm/9d² ... 2
Divide equation 1 by 2
F/F1 = GMm/d²÷GMm/9d²
F/F1 = GMm/d²×9d²/GMm
F/F1 = 1 * 9
F = 9F1
F1 = 1/9 F
This means that the new force decreases to 1/9