Answer:
heya answer option b
Explanation:
please mark me brainliest
why do we generally hear a thunder when there is a Bolt of lightning
Please answer me fast
Answer:
Explanation:
When a lightning bolt travels from the cloud to the ground it actually opens up a little hole in the air, called a channel. Once then light is gone the air collapses back in and creates a sound wave that we hear as thunder. The reason we see lightning before we hear thunder is because light travels faster than sound!
Answer:
light travels faster than sound
Explanation:
write examples of adaptation in mangrove .?
what are the adaptation of rainforest.?
Answer:
example of adaptation in mangrove
Mangroves are salt-tolerant trees, also called halophytes, and are adapted to life in harsh coastal conditions. They contain a complex salt filtration system and complex root system to cope with salt water immersion and wave action. They are adapted to the low oxygen conditions of waterlogged mud.
adaptation of rainforest
Many animals have adapted to the unique conditions of the tropical rainforests.
hope this can help you
PLEASE HELP!!!!!!!!!
How do greenhouse gases affect visible and infrared light?
A.
They reflect visible light but let infrared light pass through.
B.
They reflect both visible light and infrared light.
C.
They reflect infrared light but let visible light pass through.
D.
They let both infrared light and visible light pass through.
when a person jumps up he or she is able to come down because of what?
Answer:
due to gravity........hope its helpfulAnswer:
when a person jumps up he or she is able to come down because of the force of gravitation which pulls it back towards the Earth.
an Empty airplane has a mass of 30400 kg and a takeoff acceleration of 1.20 metre per second square what is the net force accelerating the plane
Answer:
Net force will be 36,480 N
Explanation:
As force equation is F=ma, here F =force in newton, m, mass in kg, a =acceleration in metre per second.
so F = 30400 kg * 1.20 metre per second
which will be F= 36480 Newtons
F=36480 N
When Emma pushes a bag with a force of 27 newtons, the coefficient of kinetic friction between the bag and the floor is 0.23. What is the normal force acting on the bag by the floor? A. 0.085 newtons B. 27 newtons C. 2.7 × 102 newtons D. 1.2 × 102 newtons
Answer:
D. 1.2 × 102 newtons
Explanation:
The computation of the normal force acting on the bag is shown below:
It could find out by applying the following formula
Normal force = Force ÷ coefficient of kinetic friction
where,
Force is 27 newtons
And, the coefficient of kinetic friction is 0.23
Now placing these values to the above formula
So, the normal force is
= 27 newtons ÷ 0.23
= 117.39 N
Therefore the correct option is D.
Guys I'm in kind of PICKLE!!!!!! I know people say it a lot but I will give Brainiest to the best explained answer. Determine the net force charge acting at q1 (+ 2.0 × 10-5C), caused by q2 (-4.0 × 10-5 C) and q3 (-4.0 × 10-5 Determine the net electric field acting at q1
Answer:
a) Fnet = 176.78N
b) Enet = 88.39 × 10⁵N/C
Explanation:
The average battery in a car supplies a current of 3.5 A from a
12.6 V battery to the engine. How much power is consumed by
the engine?
Answer:
44.1 W
Explanation:
Power = Voltage x current
(P = VI)
P = 12.6 x 3.5
P = 44.1 W
An ideal gas initially at 300 K undergoes an isobaric expansion at 2.50 kPa. If the volume increases from 1.00 m3 to 3.00 m3 and 12.5 kJ is transferred to the gas by heat, what are a. the change in its internal energy and b. its final temperature?
Answer:
a) [tex] \Delta U = 7.5 kJ [/tex]
b) [tex]T_{f} = 900 K [/tex]
Explanation:
a) To find the change in its internal energy (U) we need to use the following equation:
[tex] \Delta U = W + Q [/tex]
Where:
W: is the work done on the system
Q: is the energy transferred into the system by heat = 12.5 kJ
Since we have an isobaric expansion, the work is:
[tex] W = - P\Delta V = - P(V_{f} - V_{i}) [/tex]
Where:
[tex]V_{f}[/tex]: is the final volume = 3.00 m³
[tex]V_{i}[/tex]: is the initial volume = 1.00 m³
P: is the pressure = 2.50 kPa
[tex] W = -P(V_{f} - V_{i}) = -2.5 \cdot 10^{3} Pa(3.00 m^{3} - 1.00 m^{3}) = -5.00 \cdot 10^{3} J [/tex]
Now, we can find the change in its internal energy:
[tex] \Delta U = W + Q = -5.00 \cdot 10^{3} J + 12.5 \cdot 10^{3} J = 7.5 \cdot 10^{3} J [/tex]
b) The final temperature can be found as follows:
[tex] \frac{V_{i}}{V_{f}} = \frac{T_{i}}{T_{f}} [/tex]
[tex] T_{f} = \frac{T_{i}*V_{f}}{V_{i}} = \frac{300 K*3.00 m^{3}}{1.00 m^{3}} = 900 K [/tex]
Hence, the final temperature is 900 K.
I hope it helps you!
A block of mass 2 kg is placed on the floor. The coefficient of static friction is 0.4. A horizontal force of 2.5 N is applied on the block. Calculate the force of friction between the block and the floor.
Answer: 2.5N
Explanation:
Given the following :
Mass of block (m) = 2kg
Coefficient of static friction (μs) = 0.4
Horizontal force applied to the block = 2.5N
The frictional force (Ff) between the block and the floor is :
First calculate the maximum static frictional force:
Frictional force = Coefficient of static friction(μs) × normal reaction(R)
Normal reaction(R) = mass × acceleration due to gravity (10m/s^2)
R = 2 × 10 = 20
Fmax = μs × R
Fmax = 0.4 x 20 = 8N
Here, since the applied force (2.5N) is less than maximum frictional force(8N).
The force of friction between the block and the floor will be equal to the applied force of 2.5N due its ability to adjust itself in other to ensure equilibrium.
Where do comets come from in the Solar System? 2. Where are asteroids located within our Solar System? 3. How are meteors and meteorites different? 4. What are the different types of meteorites? 5. Define the terms comet, asteroid, and meteoroid.
Answer:
yes
Explanation:
Answer and Explanation: Comets are frozen extras from the development of the nearby planetary group made out of residue, rock and frosts. They range from a couple of miles to many miles wide, however as they circle nearer to the sun, they heat up and regurgitate gases and residue into a shining head that can be bigger than a planet. This material structures a tail that extends a huge number of miles.
A pendulum has a mass of 1.5 kg and starts at a height of 0.4 m if it is released from rest how fast is it going when it reaches the lowest point of its path?
Answer:
The speed of the pendulum when it reaches the lowest point of its path is 2.8 m/s
Explanation:
Given;
mass of pendulum, m = 1.5 kg
height of pendulum, h = 0.4 m
At the highest point, the velocity of the pendulum is zero and the kinetic energy is zero, so the total energy at that point is potential energy;
U = mgh
At the lowest point, the height of the pendulum is zero and the potential energy is zero, so the total energy at that point is kinetic energy;
KE = ¹/₂mv²
Apply the principle of conservation of mechanical energy
KE = U
¹/₂mv² = mgh
¹/₂v² = gh
v² = 2gh
v = √2gh
v = √(2 x 9.8 x 0.4)
v = 2.8 m/s
Therefore, the speed of the pendulum when it reaches the lowest path is 2.8 m/s
Which of the following statements are true (mark all that apply) primordial nucleosynthesis produced all of the elements heavier than helium chemical composition of our solar system matches the chemical composition of the Milky Way some of the stars in the Milky Way may be older than the Milky Way your body contains a lot of helium nearly all atoms of elements heavier then helium were produced through nuclear fusion in stellar interiors and through reactions that occur during explosions that massive stars undergo at the ends of their lives or during mergers of stellar remnants called neutron stars some of the oldest galaxies are about 13.2 billion years old nucleosynthesis is a process through which the atoms of various elements are produced you're mainly made of hydrogen
Answer:
The correct options are;
1) The chemical composition of our solar system matches the chemical composition of the Milky Way
2) Nearly all atoms of elements heavier than helium were produced through nuclear fusion in stellar interiors and through reactions that occur during explosions that massive stars undergo at the ends of their lives or during mergers of stellar remnants called neutron stars
3) Some of the oldest galaxies are about 13.2 billion years old
4) Nucleosynthesis is a process through which the atoms of various elements are produced
5) You re mainly made of hydrogen
Explanation:
1) There are dependencies between chemical composition of stars and planets and the same distribution of chemicals we have in our Solar system have been observed to be present in varying resemblance through out the Milky Way
2) The formation of heavier elements are believed to have been formed by astrophysical fusion processes
3) The oldest known object (and hence the galaxy where the star resides), is from a distant star known as GRB 090423 which is about 13 billion years old
4) New atomic nuclear are created by the process of protons and neutrons by the process of nucleosynthesis
5) 62%of the atoms in the body are hydrogen atoms.
What are some of the major differences between the ancient Olympics and modern-day Olympics? List and describe at least two differences.
Answer:
-Women are now allowed to participate in the Olympics unlike before when it was only men allowed.
-Modern Olympic Games include many more events. There are more than 20 different sports and almost 300 events in the modern games, while the first Olympics only had running.
-The Olympics are held every two years. While the ancient Olympics were originally held every four years.
-Athletes from countries around the world participate in the modern Olympics unlike in the ancient Olympics where only athletes from ancient Greece competed.
Explanation:
Edmentum Plato answer (i already reworded most of it so you don't have to) <33
.- Un cuerpo es lanzado con una velocidad de 20 m/s, formando un ángulo con la horizontal de 50o, determinar el tiempo de vuelo, el alcance máximo y la altura máxima
Answer:
- t = 3.12s
- x = 40.19m
- h_max = 11.97m
Explanation:
- In order to calculate the flight time of the body, you use the following formula:
[tex]t=\frac{2v_o sin\theta}{g}[/tex] (1)
vo: initial speed = 20m/s
g: gravitational acceleration = 9.8 m/s^2
θ: angle with the horizontal of the direction of the motion of the body = 50°
You replace the values of the parameters in the equation (1):
[tex]t=\frac{2(20m/s)sin50\°}{9.8m/s^2}=3.12s[/tex]
The flight time of the body is 3.12s
- The maximum range of the motion is given by:
[tex]x=v_xt=v_ocos\theta t\\\\x=(20m/s)(cos50\°)(3.12s)=40.19m[/tex]
where you have used the flight time.
The maximum horizontal distance traveled by the body us 40.19m
- The maximum height is:
[tex]h_{max}=\frac{v_o^2sin^2\theta}{2g}[/tex] (2)
you replace the values of the parameters:
[tex]h_{max}=\frac{(20m/s)^2sin^250\°}{2(9.8m/s^2)}=11.97m[/tex]
The maximum height is 11.97 m
1.A car starts from rest and acquires a velocity of 54 km/h in 2 minutes.Find(i) the acceleration and(ii) distance travelled by the car during this time.Assume,motion of the car is uniform.
Answer:
1.) 1620 km/h^2
2.) 2.7 km
Explanation:
1.) Given that the car start from rest. The initial velocity U will be equal to zero. That is,
U = 0.
Final velocity V = 54 km/h
Time t = 2 minute = 2/60 = 1/30 hour
Acceleration a will be change in velocity per time taken. That is,
a = ( V - U )/ t
Substitute V, U and t into the formula
a = 54 ÷ 1/30
a = 54 × 30 = 1620 km/h ^2
2.) Distance travelled S by the car during the time can be calculated by using the 2nd equation of motion.
S = Ut + 1/2at^2
Substitute all the parameters into the formula
S = 54 × 1/30 + 1/2 × 1620 × (1/30)^2
S = 54/30 + 810 × 1/900
S = 54/30 + 810/900
S = (1620+810)/900
S = 2430/900
S = 2.7 km.
Therefore, distance travelled by the car during this time is 2.7 km
During the warm-up and your scheduled physical activity, what was the weather like? Did the
temperature or conditions affect how much water you drank? How?
Answer: I did these exercises outdoors. The weather was hot and humid, so I drank about two cups of water during the workout. I also drank a cup of water about an hour before I started. Yes, the weather most definitely affected how much I drank.
Explanation: Edmentum
Determine the following quantities for the circuits shown below:
(a) the equivalent resistance
(b) the total current from the power supply
(c) the current through each resistor
(d) the voltage drop across each resistor and
(e) the power dissipated in each resistor.
WILL MARK AS BRAINLIEST!
Answer:
a) 588.235 ohm ( all the 3 resistors are in parallel )
b) 10 A
c) Current flowing -
in 20 ohm resistor = 6.25 A
in 100 ohm resistor = 1.25 A
in 50 ohm resistor = 2.5 A
d) Voltage drop across all the resistor = 125 V
(As all the resistors are in parallel all the resistors will have the same voltage drop )
e) Power dissipated -
in 20 ohm resistor = 781.25 W
in 100 ohm resistor = 156.25 W
in 50 ohm resistor = 312.5 W
(Power = Current × Potential Difference)
Find vertical and horizontal displacement. Please help. 10 points. Thank you.
Explanation:
horizontal velocity = 30 x Cos45 = 19.48m/s
to find horizontal displacement
horizontal displacement = horizontal velocity x timehorizontal displacement = 19.48 x 2 = 38.96mvertical velocity = 30 x Cos45 = 22.81m/s
vertical displacement = vertical velocity x time
vertical displacement = 22.81 x 2 = 45.62m
Answer:
Displacement after two seconds
= <Dx,Dy> = <42.426, 1.593> m to three decimal places
Explanation:
Given:
arrow shot at 30m/s and 45 degrees with horizontal.
Hit bull's eye after 2 seconds.
Find horizontal and vertical displacements.
Vx = 30cos(30) m/seconds constant velocity
therefore
Dx = Vx*t = 30cos(30) m/s * 2 s = 60 cos (45) = 42.426 m
Vy = 30 sin(45) m/s
Dy = Vy*t + a(t^2) /2
= 30*sin(45) -9.81(2^2)/2 (g is accelerating downwards, so negative)
= 1.593 m
The net displacement after 2 seconds is
D = <Dx,Dy> = <42.426, 1.593> m to three decimal places
On average, both arms and hands together account for 13% of a person's mass, while the head is 7.0% and the trunk and legs account for 80%. We can model a spinning skater with her arms outstretched as a vertical cylinder (head, trunk, and legs) with two solid uniform rods (arms and hands) extended horizontally. Suppose a 70.0 kg skater is 1.60 m tall, has arms that are each 66.0 cm long (including the hands), and a trunk that can be modeled as being 33.0 cm in diameter. If the skater is initially spinning at 68.0 rpm with her arms outstretched, what will her angular velocity 2 be (in rpm ) after she pulls in her arms and they are at her sides parallel to her trunk? Assume that friction between the skater and the ice is negligble.
Answer:
178.15524 rpm
Explanation:
The first thing we want to do is see what information we are given here. This first bit states that both arms and hands together account for 13% of a person's mass. Respectively the head accounts for 7 percent, and the trunk and legs account of 80% of the mass. We have three key points here so far. The mass of the skater is 70 kilograms, having a height of 1.60 meters, arms that are 66 cm, and a trunk diameter of 33 cm. And of course, the initial angular speed of the skater ( ω ) is 68 reps per minute -
{ Total mass of skater ( [tex]m[/tex] ) = 70 kg, }
{ Height of skater ( [tex]h[/tex] ) = 1.60 m, }
{ Diameter of trunk ( [tex]D[/tex] ) = 33 cm = 0.33 m, }
{ Length of arms ( [tex]l[/tex] ) = 66 cm = 0.66 m, }
{ Mass of Arms and hand ( [tex]m_1[/tex] ) = 13%( 70 ) = 9.1 kg, }
{ Mass of Head ( [tex]m_2[/tex] ) = 7%( 70 ) = 4.9 kg, }
{ Mass of Trunk and legs ( [tex]m_3[/tex] ) = 80%( 70 ) = 56, }
{ Initial Angular Speed of Skater ( ω ) = 68 rpm }
______
Take a look at the formula( s ) in the attachments. The first attachment represents the initial moment of inertia of the skater, and the second represents the final moment of inertia of the skater. In other words, when the person's arms are outstretched, and when the arms are parallel to the trunk. Let's calculate each -
Arms outstretched
[tex]I = ( ( 9. 1 )( 0.66 )^2 ) / 3 + ( ( 4.9 )( 0.33 )^2 ) / 10 + ( ( 56 )( 0.33 )^2 ) / 8,\\I = 2.136981\\[/tex]
Arms parallel to truck
[tex]I = ( ( 4.9 )( 0.33 )^2 ) / 10 + ( ( 56 )( 0.33 )^2 ) / 8,\\I = 0.815661[/tex]
______
The final angular velocity should be the division of the two multiplied by the number of rpm -
2.136981 / 0.815661( 68 rpm )...
( About ) 178.15524 rpm
Do double check my calculations!
Wings of a bird what kind of motion is it
Answer:
linear motion
Explanation:
the birds in the sky show oscillatory motion when they flap their wings
For the following question, two statements are given- one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (i), (ii), (iii) and (iv) as given below. i) Both A and R are true and R is correct explanation of the assertion. ii) Both A and R are true but R is not the correct explanation of the assertion. iii) A is true but R is false. iv)A is false but R is true. Assertion: Concave mirrors are used as reflectors in torches, vehicle head-lights and in search lights. Reason: When the object is placed beyond the centre of curvature of a concave mirror, the image formed is real and inverted.
please help
Answer:
assertion is true but the reason is not true
Explanation:
I will give Brainliest to whoever can answer!!!!
If the phase of the vibrating sources was changed so that they were vibrating completely out of phase, what effect would this have on the interference pattern?
Answer:
The nodes and anti nodes would reverse roles.
Explanation:
I believe it has to do with the path differences. If waves are in phase, then the path differences are such that the waves reach the screen with crests superimposing crests and troughs superimposing troughs. This happens when the periods of each wave are equal or the paths themselves differ by a whole number multiple of the wavelength (λ, 2λ, 3λ, ...).
Now make these waves out of phase. Then half of the waves will travel half a wavelength farther than the rest. So the path difference will be 0.5λ, 1.5λ, 2.5λ, ....
A train moves at a constant velocity of 50 km/hHow far will it move in 0.5 h?
A. 10 km
B. 45 km
C.25 km
D. 20 km
Answer:
C
Explanation:
[tex]\dfrac{50km}{h}\cdot 0.5h= \\\\\\50km\cdot 0.5=25km[/tex]
Therefore, the correct answer is choice C. Hope this helps!
The correct answer is C.
It is C because .5 h is equal to 30 minutes. So half of 50 km is 25 km(Divided by 2)
One of the key disadvantages of buying fitness equipment is __________. A. privacy B. flexibility C. maintenance D. choice Please select the best answer from the choices provided. A B C D
Answer:
C. maintenanceExplanation:
I personally believe one key disadvantages is the cost of maintaining the equipment unlike the gym where you have to subscribe for the month or the year and forget about anything, owning the gym equipment comes with the extra cost and responsibilities of maintenance to the owners.
Answer:
C
Explanation:
Edge 2020
What is the kinetic energy of a 620.0 kg roller coaster moving with a velocity of 9.00 m/s? Round to three significant figures.
For your question "What is the kinetic energy of a 620.0 kg roller coaster moving with a velocity of 9.00 m/s? Round to 3 significant figures. "
Out of the options, the answer would be 25100J
Best of luck!
The kinetic energy of the roller coaster with a mass of 620kg which is moving with a velocity of 9.00 m/s is 25,100 Joules.
What is Kinetic energy?Kinetic energy is the energy that an object has because of its motion. If we want to accelerate an object, then we must apply a force which results into change in velocity of that object. By applying a force it is required to do work. After work has been done on the object, energy has been transferred to the object, and the object will be moving with a new constant speed in a direction. It is a vector quantity as it has both the magnitude and direction. It can be calculated as:
KE = 1/2 × m × v²
where, KE = Kinetic energy,
m = mass of the object,
v = velocity of the object
KE = 1/2 × 620 × (9)²
KE = 310 × 81
KE = 25,110 Joules
Learn more about Kinetic energy here:
https://brainly.com/question/15764612
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difference between uniform velocity and variable velocity .
Answer:
If a body covers equal displacement in equal interval of time,however small may be the body is said to have uniform velocity. If a body covers in equal displacement in equal interval of time is called variable velocity.
Will give braibliest for the person who answered first correctly How long will it take for a 30W light bulb to transfer 1200J of energy -400 seconds -4 minutes -40 seconds -4 seconds
Answer:
40 secondsSolution,
[tex]p = \frac{w}{t} \\ or \: 30 = \frac{1200}{t} \\ or \: 30 \times t = 1200 \\ or \: t = \frac{1200}{30} \\ t = 40 \: seconds[/tex]
Hope this helps..
Good luck on your assignment.
Answer:
40 seconds
Explanation:
Time (measured in seconds) = Work Done (measured in Joules) / Power (measured in Watts)
Time (s) = 1200/30
Time (s) = 40
It will take 40 seconds for a 30W light bulb to transfer 1200J of energy.
write the chemical formulae for; nitrogen monoxide, hydrochloric acid, barium phosphate, ammonium hydroxide,nitric acid
Answer:
Nitrogen Monoxide = NOHydrochloric Acid = HCLBarium Phosphate = (Ba) 3{(Po)4}Ammonium Hydroxide = (NH) 4(OH) Nitric Acid = H(NO)3You discover a binary star system in which one member is a15 solar mass main-sequence star and the other star is a 10 solar mass giant star. How do we believe that a star system such as this might have come to exist?
Answer:
yes
Explanation: