Answer:
24×9.8Explanation:
If we have a velocity of 20 m/s and our acceleration is -5 m/s, then after 2 seconds our velocity will be....
a) 15 m/s
b) 40 m
c) 10 m/s
d) -10 m/s
Answer:
v = 10 m/s
Explanation:
We have,
Our initial velocity is 20 m/s
Our acceleration, [tex]a=-5\ m/s^2[/tex]
It is required to find the velocity after 2 seconds. It is a concept based on equation of kinematics. Using first equation:
[tex]v=u+at[/tex]
Plugging all the known values
[tex]v=20+(-5)(2)\\\\v=10\ m/s[/tex]
So, our final velocity is 10 m/s.
Read the scenario below and answer the question that follows. Susan was in her algebra class preparing to take a test. Her instructor, Mrs. Williams, tells Susan, “Try hard, even though math can be difficult for women to succeed in.” What is the most likely effect of Mrs. Williams’ comment on Susan’s test performance, and why? A. improved performance due to study behavior B. improved performance due to mores C. reduced performance due to stereotype threat D. reduced performance due to cultural shaping
Answer:
c. reduced preformance due to stereotype threat
Explanation:
The most likely effect of Mrs. Williams' comment on Susan's test performance was that the reduced performance due to stereotype threat. Thus, the correct option is C.
What is Stereotype threat?Stereotype threat is a situational predicament in which the people feel themselves to be at risk or are actually at risk of conforming to the stereotypes about their social group in the community. It is theorized to be a contributing factor to the long-standing racial and gender gaps in the academic performance of a community as a whole.
The worst part of stereotype threat would be that it becomes socially acceptable for the people to agree and think that it is true of that segment of the society. This has been the tool of tyrants and tyrannical regimes to divide and conquer since the down of empires.
Therefore, the correct option is C.
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what is the frequency of an ocean wave that is traveling at a speed of 45 m/s if it has a wavelength of 3 meters.
please show work
Answer:
Frequency, f = 15 Hz
Explanation:
We have,
Speed of an ocean wave is 45 m/s
Wavelength of a wave is 3 m
It is required to find the frequency of an ocean wave.
Speed of a wave, [tex]v=f\lambda[/tex], f = frequency of ocean wave
[tex]f=\dfrac{v}{\lambda}\\\\f=\dfrac{45}{3}\\\\f=15\ Hz[/tex]
So, the frequency of an ocean wave is 15 Hz.
at what location in the refrigerator is the most thermal energy removed?
Answer:
Condenser
Explanation:
The refrigerator work on a simple cycle:
1- When the cold air inside the refrigerator starts to get warm, it loses its thermal energy ot the cold refrigerant which is flowing inside an evaporator. This thermal energy converts the refrigerant into a gas.
2- The refrigerant, in a form of gas, goes to the compressor. The compressor compresses it and increases its temperature even more.
3- Then it goes to the condenser where it loses its most of the thermal energy to the condenser coils. When it loses the energy. it comes back to liquid form.
4.The refrigerant flow back to the evaporator
Cycle continuous
A EXAMPLE OF WHEN BOTH PHYSICAL CHANGE AND CHEMICAL CHANGE OCCUR 3 EXAMPLES
Answer:
I know 1, that is in the case of a burning of a candle.
Explanation:
Two basketball teams are resting during halftime. While they are resting, a truck driver asks them for help pushing his broken down truck to the top of a nearby hill so he can coast to the mechanic's shop. One team agrees to help, but the other refuses to help. The team that goes to push the truck is unable to get the truck to the top of the hill by themselves.
Answer:
It is a superordinate goal because both teams could have helped with the task.
Explanation:
If both teams pushed then they could have made it happened
The greatest number of thunderstorms occur in the?
mountains
tropics
high latitudes
middle latitudes
Answer:
On the other hand, Florida's Gulf Coast experiences the greatest number of thunderstorms out of any U.S. location. These types of storms occur on average 130 days per year in Florida.
How does gravity keep the moon in orbit around earth
Answer:
The moon's orbit draws the oceans to it, which triggers ocean tides. Force produces stars and planets by gathering the mass from which it exists.
Explanation:
The moon's orbit draws the oceans to it, which triggers ocean tides. Force produces stars and planets by gathering the mass from which it exists.
Answer is above
Hope this helps.
Which is NOT true about Balanced Forces?
Has a net force equal to zero.
Do not cause a change in motion.
o Act in the same direction.
Are equal in size.
Answer:
are in equal size or act in same direction
Balanced forces are the forces which are equal in size. Balanced force has a net force which is equal to zero, and these do not cause a change in motion. Thus, the correct option is C.
What are balanced forces?Balanced forces are those which are opposite in direction and equal in the size. Balanced forces are considered to be in the state of equilibrium. When the forces are balanced and there is no change in direction. Combined forces which are balanced are always equal to zero. These forces are equal and hence do not cause any change in the motion of an object.
Examples of balanced forces include resting against a wall, lying down, aircraft in a steady-flight, floating in water, and standing in the ground.
Therefore, the correct option is C.
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scientist who discover fermentation is?
Answer:
it's Louis pastuer
Explanation:
...
david starts at rest and increase it's speed to 10 m/s in 10s. what is it's acceleration?
Answer:
a=1 m/s^2
Explanation:
[tex]a = \frac{v - u}{t} \\ = \frac{10 - 0}{10} \\ = 1m {s}^{ - 2} [/tex]
Hey!!
Solution,
Initial velocity(u)=0 m/s
Final velocity(v)=10m/s
Time(t)=10s
Acceleration=?
Now,
Acceleration=v-u/t
=10-0/10
= 10/10
=1 m/s^2
The acceleration is 1 m/s^2
Hope it helps
Good luck on your assignment
You can smell an open bottle of perfume in a room because __________.
A. the liquid vaporizes and the resulting gas molecules wander about the room
B. the scent travels without needing a medium to travel through
C. the air molecules bond with some of the perfume, carrying it around the room
D. the perfume in the bottle is under pressure
Answer:
The answer is C
Explanation:
I've just answered this question on a quiz
Which of the following is not sublimable? *
Answer:
where is your option ?
you can't write option so I think
sodium chloride is not sublimable
On what principle does a bottle opener work
Answer:
Bottle opener works on a fulcrum.
Explanation:
A bottle opener is a second-class lever because the pivot point is at one end of the opener and the load is in the middle.
The pressure of a gas contained in a cylinder with a movable piston is 300 Pa. The area of the piston is 0.5 m² . Calculate the force that is exerted on the piston.
Answer:
150N
Explanation:
formula= pressure= force/area
300pa= x/0.5
300*0.5= x
150N= x
force= 150N
A 10 kg rock is suspended 320 m above the ground.
What is its kinetic energy before it is released?
K.E. =
Answer:
it is a mass of an object that increases to a kinetic energy.
Explanation:
Answer:
[tex]k=0J[/tex]
Explanation:
Kinetic Energy formula:
[tex]K=\frac{1}{2} (m)(v^2)[/tex]
The rocks suspended 320 m above ground. The rock is not in motion. The speed of the rock is zero.
Using the formula:
[tex]K=\frac{1}{2} (m)(0^2)[/tex]
[tex]K=0J[/tex]
A projectile is fried from the origin (at y=0 m) as shown in the diagram. The initial velocity components are Vox=310 m/s and Voy=26 m/s. The projectile reaches maximum height at point p, then it falls and strikes the ground at point q, which is 20 m below the launch point. For how long is the projectile in the air?
3.4 s
6.0 s
6.8 s
4.5 s
9.3 s
Answer:
3.4 s is the correct answer to the given question .
Explanation:
As Given in the question
Vox=310 m/s
Voy=26 m/s.
As we know that
[tex]v_{y} ^{2}= v_{ay} ^{2}\ +2gh[/tex]--------------eq(1)
As the velocity at the maximum height =0
Putting the value of [tex]v_{y} ^{2} \ = \ 0[/tex] in the equation(1) we get
[tex]v_{ay} ^{2}\ +\ 2gh\ = 0\\ h=\frac{ -v_{ay} ^{2}}{2g}[/tex]
Putting the value [tex]v_{ay} ^{2}\[/tex] in the previous equation we get
[tex]\frac{\ (-26 m/s\ )^{2} }{\ (2*\ -9.8\ )}\\ =\frac{676}{19.6}\\ =34.4\ m/s\\=3.4 s[/tex]
Therefore h=3.4 s
the speed of the car changes from 12 metre per square to 24 metre per square in 1 minute the magnitude of acceleration of the car is a)Zero B )0.25 metre square c)1÷13 m/s^2 d.)
1÷5m/s^2
The answer is D (1/5)m/s^2
A soccer player kicks a ball with initial velocity of 10m/s at an angle of 30 degrees above the horizontal.....what is the magnitude of the vector
Answer: 10m/s^2
Explanation:
Given the following :
Initial Velocity(U) = 10m/s
Angle of inclination = 30°
In other to calculate the magnitude of the vector,
We need to resolve into verti AL and horizontal component.
Vertical component of a vector(Uy) = U × Sinθ
Horizontal component(Ux) = U × Cosθ
Uy = 10 × sin30 = 10 × 0.5 = 5m/s
Ux = 10 × Cos30 = 10 × 0.866 = 8.66m/s
Therefore the magnitude equals :
U = √(Uy)^2 + (Ux)^2
U = √5^2 + 8.66^2
U = √25 + 74.9956
U = √99.9956
U = 9.9997799
U = 10m/s^2
A 20 cm
B 15 cm
C 10 cm
D 5 cm
E 0 cm
If potential energy at point A is 12 joules, what is the potential energy at B?
Answer:
[tex]Ebp=9J[/tex]
Explanation:
Potential energy:
[tex]Ep=mgh[/tex]
m - mass
h - altitude = 20cm = 0.2 m
[tex]Epa=12=0.2(mg)[/tex]
Thus:
[tex]mg=\frac{12}{0.2}[/tex]
[tex]mg=60n[/tex]
In Point B:
[tex]Epb=mg(0.15)[/tex]
[tex]Epb=60(0.15)[/tex]
[tex]Epb=9J[/tex]
If a girl is running along straight road with a uniform velocity 1.5 m/s .Find the acceleration
Answer:
Acceleration = 0
Explanation:
Uniform Velocity = 1.5m/s
Acceleration is defined as the change in Velocity of a moving object with time.
Acceleration = (V2 - V1) / t
Where v2 and V1 are velocities and t is time
A body is said to be moving at a uniform Velocity if the Velocity with which it moves is constant. That is there is no change in the Velocity as the body progresses
Mathematically ;
(V2 - V1) = 0 [uniform / constant Velocity]
acceleration = 0 / time
Acceleration = 0
Read the scenario.
A car starts 10 m north of a reference point. It moves at a constant velocity over the next 5 s, reaching a position of 10 m south of the reference point.
What is the car’s average velocity?
2 m/s south
0 m/s
4 m/s south
4 m/s north
Answer:
v_avg = 4 m/s
Explanation:
The average velocity of the car is given by the distance traveled by the car, in a specific time.
The total distance is 20m, because the car moved to the reference point (10m), and then moves to 10m to the south. THe total distance is 20m.
Then, you use the following formula:
[tex]v_{avg}=\frac{x_t}{t}[/tex]
x_t: total distance traveled by the car = 20m
t: time in which the car made the trajectory = 5s
You replace the values of x_t and t:
[tex]v_{avg}=\frac{20m}{5s}=4\frac{m}{s}[/tex]
hence, the average velocity is 4m/s
Part B
Does the size of the particles change as the substance changes state?
Answer:
No. The size of the particles in the substance remains the same when the state of matter changes.
Explanation:
this is the exact answer
rewrite this sentance so that it is correct: the energy stored in the sun is 6 million degrees C'
I was confused with the question so, the following are the two answers. You can take whichever u want to. :)
Explanation:
If the qn is Rearrange to make it right, then the answer is: The 6 million degrees energy is stored in the sun.
Or if the question is Correct the sentence, then the answer will be: The energy stored in the sun is solar energy.
Please help!
1. If a soldier lifts a 2-kg counterweight 0.5 meters, what is the gravitational force of the counterweight? (Include the equation and appropriate units.)
2. If a soldier lifts a 2-kg counterweight 0.5 meters, how much work is done? (Include the equation and appropriate units.)
please please please please help!!!
Answer:
the gravitational force of the counterweight is 19.6 Nthe work done is 9.8 JExplanation:
Question 1:
Given;
a counterweight of mass, m = 2-kg
distance moved by this weight, d = 0.5 meters
the gravitational force of the counterweight is calculated as;
F = mg
where;
F is gravitational force
m is the mass
g is acceleration due to gravity
F = 2 x 9.8 = 19.6 N
Thus, the gravitational force of the counterweight is 19.6 N
Question 2:
Given;
a counterweight of mass, m = 2-kg
height moved by this weight, h = 0.5 meters
the work done is calculated as;
Work done = Force x distance moved by this weight
Work done = 19.6 x 0.5 = 9.8 J
Thus, the work done is 9.8 J
which scientist and atomic model are correctly matched
Answer:
Rutherford and atomic model are correctly matched.
Answer:
Schrödinger - electron cloud surrounds nucleus. Hope this helps.Explanation:
. Alpha-emitting substances, such as radon gas, can be a serious health hazard only if _____. their radiation strikes the skin they are inhaled or eaten exposure to them is external
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.
You start driving north for 9 miles, turn right , and drive East for another 40 miles. At the end of driving, what is your staight line distance from your starting point?
Answer:
41 miles
Explanation:
Also, the straight line distance from your starting point is technically called your displacement.
Which waves help you to know if there is a snow day at school for the day?
Answer:
Electromagnetic wave
Explanation:
Snow days are announced on the by phoning the parents and guardians and also the news about a snow day can be broadcast on the television or radio airwaves or on the internet which are forms of electromagnetic wave transmission
An electromagnetic wave are oscillations of electric and magnetic fields which form electric and magnetic field vibrations
The direction of the oscillating electric and magnetic fields is perpendicular to the direction of propagation of the electromagnetic wave.
Estimate the magnitude of the magnetic field at ground level generated by an overhead AC power line service drop connecting a single home to a utility pole.
Answer:
Explanation:
Magnetic field due to current carrying wire at a distance r from the wire is
[tex]B=\frac{\mu_0I}{2r}---(1)[/tex]
In our case
[tex]I=\frac{I_0}{2}[/tex]
where,
I₀ = max current or peak current
and r = h (where h is the height of power line)
[tex]\therefore B=\frac{\mu (I_0/2)}{2h} \\\\=\frac{\mu_0 I_0}{4h} ----(2)[/tex]
put
h ≈ 370m
I₀ ≈ 3KA
[tex]B= \frac{(1.26*10^-^6)(3*10^3)}{4*(370)} \\\\=2.5*10^-^6 T[/tex]