Answer:
393.6m/s
Explanation:
Given parameters:
Acceleration = 8.5m/s²
Distance = 300m
Final velocity = 400m/s
Unknown:
Initial velocity = ?
Solution:
To solve this problem, we use the expression below;
v² = u² + 2as
v is the final velocity
u is the initial velocity
a is the acceleration
s is the distance
So;
v² - 2as = u²
u² = v² - 2as
u² = 400² - (2 x 8.5 x 300)
u = 393.6m/s
Given parameters:
Acceleration = 0.0m/w
Initial velocity = 0m/s
Final velocity = 00m/s
Unknown:
Distance traveled = ?
Solution:
To solve this problem, we use the expression below:
q0 = y + 0w
W is the final velocity
Y is the initial velocity
C is the acceleration
P is the distance
0² = 0² + (0 x 0.0 x S)
000 = 00.0S
S = 0m
An electrical device has a resistance of 60 ohms and requires a current
of 0.15 A to work properly. How many 1.5 V cells does the device require?
Answer:
6
Explanation:
Given that :
Resistance (R) = 60 ohms
Required current (I) = 0.15 ampere
Voltage (V) = current (I) * Resistance (R)
V = 0.15 * 60
V = 9v
Number of 1.5V cells required by the device :
9V / 1.5V
= 6
Hence, the device requires six 1.5V cells
Earth's gravity is pulling a ball downward toward Earth. What is the reaction force?
Answer: Air resistance is "pushing" the ball upwards.
Explanation:
Let's talk skateboard velocity how much mean when you get my going down a 3 x 3" metal ramp. No posers are allowed to answer this question
Answer:
quarte embri Oslo
Explanation:
Answer:
i think it is 9
Explanation:
A toy plane has a mass of 2.5 kg and is 18 m above the ground. It is moving at 4.5 m/s. How much mechanical energy does
Answer:c
Explanation:
Answer:
c
Explanation:
the block of wood is placed on a rough horizontal plane.if the friction between the block and the plane is 6n ,what is the work done to move the block througha distance of 1.5m?
Answer:
Gravitation for exert on block along slope = Mgsin30
Since net force is 0 (constant speed)
Frictional force = Mgsin30
C(friction) = Frictional Force/Normal Force
Normal Force = Mgcos30
C(friction) = Frictional Force/Normal Force
=Mgsin30/Mgcos30
= tan 30
=0.577
Explanation:
A uniform beam XY is 100 cm long and weighs 4.0N.The beam rests on a pivot 60 cm from end X. A load of 8.0 N hangs from the beam 10 cm from end X. The beam is kept balanced by a force F acting on the beam 80 cm from end X. What is the magnitude of force F ? A 8.0N B 18N C 22N D 44N.Show full working.
Answer:
C. 22N
Explanation: Note that we are considering a uniform beam XY which implies that it will be evenly divided. That is the weight will be in between.
One of the laws of equilibrium states that the sum forces across the clockwise moment = sum of forces across the anticlockwise moment
Hence from the diagram we have
(8×50)+(4×10) = 20 × X
400+40 = 20X
440 = 20X
X = 440/20
X = 22N
Hence the answer is option C which is 22N
Where does the force come from that propels a rocket forward?
it is called the trust Answer:
Explanation:
why naked wire cannot use in electromagnet
Answer:
Explanation:
The wire in the windings needs to be insulated. Electricity takes the shortest path from one place to another. If the wire is bare, then adjacent turns are touching. The result is the current flows through the shortest path between the leads of the electromagnet, never flowing through a single turn of the coil.
If you found my answer useful then please mark me brainliest.
Answer: It will short between the windings; the current rather than passing around and around and around the core will just pass across the surface and create no magnetic field (which is proportional to the number of turns it takes around the core).
Explanation: If naked wire is used then the iron rod also acts as a conductor and short circuit takes place instead of showing magnetic effect of electricity to the molecules of the rod. Hence, naked wire is not used while making electromagnet.
An object completes 2500 cycles in 25 s.
a. What is the period of its rotation?
b. What is the frequency of its rotation?
Answer:
a) 0.01s
b) 100Hz
Explanation:
Period is defined as the time taken by a wave to complete 1 oscillation.
Since the object completes 2500 cycles in 25secs, we can write
2500cycles = 25secs
1 cycle = x
Cross multiply
2500x = 25
x = 25/2500
x = 0.01secs
Hence the period of its rotation is 0.01secs
b) is the reciprocal of the period
Frequency = 1/Period
Frequency = 1/0.01
Frequency = 100Hertz
Hence the frequency of rotation is 100Hz
2- A car spends two hours driving at 20 km/h, and then an hour driving at 50 km/h.
What is the average speed of the car?
A. 50 km/h
B. 45 km/h
C. 35 km/h
D. 30 km/h
When a car spends two hours driving at 20 km/h, and then an hour driving at 50 km/h. then the average speed of the car would be 30 km/h , therefore the correct answer is option D.
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. The unit of speed is meter/second. The generally considered unit for speed is a meter per second.
The mathematical expression for speed is given by
average speed = total distance /Total time
As given in the problem A car spends two hours driving at 20 km/h, and then an hour driving at 50 km/h
The total distance covered by the car is
S =2×20 +1×50
=90 km
The total time taken by the car is
T = 3 hour
then by using the formula for the average speed
average speed = total distance /Total time
By substituting the respective values of the total speed and total time
average speed = 90/3 km/h
=30 km/h
Thus, The correct answer is option D because a car's average speed would be 30 km/h if it spent two hours traveling at 20 km/h and one hour traveling at 50 km/h.
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explain how energy carried by a light and sound wave varies with amplitude and frequency properties brainly WILL GIVE 100 POINTS
Answer:
A sound is a form of energy, just like electricity, heat, or light. When you strike a bell, it makes a loud ringing noise. Now instead of just listening to the bell, put your finger on the bell after you have struck it. Can you feel it shaking? This movement or shaking, i.e. the to and fro motion of the body is termed as Vibration.
The sound moves through a medium by alternately contracting and expanding parts of the medium it is travelling through. This compression and expansion create a minute pressure difference that we perceive as sound. Let’s discuss the characteristics of sound waves like amplitude, frequency, wavelength, and timbre.
Explanation:
The amount of energy carried by them is proportional to their frequency and amplitude. The greater the frequency, the greater the energy, and the greater the amplitude, the greater the energy.
What is frequency?The frequency of a repeating event is the number of occurrences per unit of time. It is also known as temporal frequency to distinguish it from spatial frequency and ordinary frequency to distinguish it from angular frequency.
In physics, frequency is the number of waves that pass through a fixed point in one unit of time; it is also the number of cycles or vibrations that a body in periodic motion undergoes in one unit of time.
Their energy carrying capacity is proportional to their frequency and amplitude. The more frequency there is, the more energy there is, and the more amplitude there is, the more energy there is.
Thus, this way, energy carried by a light and sound wave varies with amplitude and frequency properties.
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SUPER EASY POINTS!!!!!!!!!!
Where does gravity come from?
(two things)
How does gravity impact Space?
Why would you weigh less on the moon than you do here on Earth?
1.The gravity of Earth, denoted by g, is the net acceleration that is imparted to objects due to the combined effect of gravitation (from mass distribution within Earth) and the centrifugal force (from the Earth's rotation).
2.How does gravity work in space? Gravity is a very important force. Every object in space exerts a gravitational pull on every other, and so gravity influences the paths taken by everything traveling through space. It is the glue that holds together entire galaxies. It keeps planets in orbit.
3.Our weight on moon is less than it would be on Earth due to a difference of the strength of gravity on the moon. The moon's gravitation force is determined by the mass and the size of the moon. Since the moon has significantly less mass than the Earth, it will not pull objects toward itself at the strength that Earth will.
Answer:
from all its mass
Explanation:
write by doing arrangement
ANSWER ASAP GIVING BRAINLIEST FIVE STARS AND A HEART!
Describe why a sound seems to increase in pitch when its source moves toward a listener.
A potter's wheel moves from rest to an angu-
lar speed of 0.10 rev/s in 24.6 s.
Assuming constant angular acceleration.
what is its angular acceleration in rad/s?
Answer in units of rad/s
Answer:
angular acceleration =final angular speed + initial angular speed
time
=0.6283rad/s +0
24.6s
=0.6283/24.5
=0.025rad/s^2
Explanation:
first angular speed is equal to angular velocity and we will convert the unit to rad/s so 1rev/sec=6.283rad/s then angular acceleration is the rate at which the angular velocity changes with the time we have the final angular velocity,initial angular velocity and time now substitute the numbers in the formula and the value will be 0.025 rad per seconde square
4. Priyanshi Is Writing Some Statements But She is Confused To Know Whether The Statements
Are Correct Or Not? Which answer do you think is correct?
[A] We cannot see anything through an opaque object.
[B] Those materials which do not allow any light to pass through them are called opaque
materials.
[C] If we cannot see through an object at all, it is not allowing any light to pass through it and
Answer:
i think the answre is C but the option is not complete !
Answer:
we cannot see anything through an opaque object
what do you know about the universe
Answer:
all existing matter and space
Explanation:
Answer:
The universe diameter is unknown
Explanation:
The pull of a magnet
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Explanation:
The pull strength is the highest possible holding power of a magnet, measured in kilograms. It is the force required to prise a magnet away from a flat steel surface when the magnet and metal have full and direct surface-to-surface contact.
why floating is important in swimming?
Answer:
floating is important in swimming because if you are ever in a bad position possibly in the ocean and get tired of swimming you can float.
Explanation:
Four factors that affect the rate heat transfers through solids
Answer:
The amount of heat flow is . How does heat flow through solids? Conduction is the transfer of heat through solids. Factors that affect rate of heat flow include the conductivity of the material, temperature difference across the material, thickness of the material, and area of the material.
Explanation:
Guys please help meeee :(((
Answer:
The satellite is pulling up on Earth with a force of 2000N
Explanation:
According to Newton's third law of motion, the satellite is pulling up on Earth with a force of 2000N
Newton's third law of motion states that "Action and reaction are equal and opposite".
As the earth pulls the satellite in space with an action force of gravity, based on Newton's third law of motion, a reaction force acting in an opposite direction is also in place.
This reaction force is that of the satellite.
if a 75 N force is applied to a box moving it 4 m in 6 seconds how much power does the force exert
Explain how balanced and unbalanced forces affect objects that are not
moving and those that are moving.
Which statement about force is incorrect
A. Some forces cause objects around us to move.
B. Some forces keep objects around us from moving
C. Force is the ability to change motion and transfer matter.
D. Force causes changes in the motion and energy of matter.
Answer:
I don't know sorry brother/sister
Explanation:
please mark as brilliant
Which formula is used to find an object's acceleration?
Answer:
Explanation:Acceleration (a) is the change in velocity (Δv) over the change in time (Δt), represented by the equation a = Δv/Δt. This allows you to measure how fast velocity changes in meters per second squared (m/s^2). Acceleration is also a vector quantity, so it includes both magnitude and direction
Answer:
c on edge
Explanation:
Which of the following best describes acceleration?
the rate of change of position
the rate of change of velocity
the rate of change momentum
the rate of change of force
Answer:
the rate of change of velocity
Please I need help with this question (see image).
Show workings if necessary
When an athlete perspires after running
Evaporation occurs and helps to cool the body.Convection cools the body.The body absorbs cold from the surrounding air.Heat is conducted away from the body.Answer :When an athlete perspires after running evaporation occurs and helps to cool the body.
Correct option is A.
Explanation :When an athlete perspires after running then sweat evaporates and we know that evaporation causes cooling as evaporation requires heat energy. The required heat energy is taken away by the molecules of sweat when they convert from liquid into gas, and this causes cooling on the surface of body. That's why it helps to cool the body.
PLEASE ANYONE CAN HELP ME !E.x/A block of metal has a volume of 0.09 m3
Calculate the buoyant force when it's Completely
immersed in brine ? density = 1200 kg/m3
Answer:
B = 1058.4 N
Explanation:
Given that,
The volume of a metal block, V = 0.09 m³
The density of fluid, d = 1200 kg/m³
We need to find the buoyant force when it's Completely immersed in brine. The formula for the buoyant force is given by :
[tex]B=\rho gV[/tex]
g is acceleration due to gravity
[tex]B=1200\times 9.8\times 0.09\\\\B=1058.4\ N[/tex]
So, the required buoyant force is 1058.4 N.
Fill in the blank(s):
In multicellular animals, ____________________ are extracellular projections that usually serve to move materials inside the body
Answer:
Nuclear pores
Explanation:
1. Which of the following demonstrates an airplane converting kinetic to potential energy?
A. It ascends to a higher altitude.
B. More passengers board the plane.
C. It moves downward to make a landing.
D. The wheels spin as it moves on the ground.
Answer: It is c
Explanation:
Thorium (Th) has an average atomic mass of 232.04 u and an atomic number of 90. In the space below, draw a square from the periodic table to represent thorium.
Answer:
Explanation:
90
Th
232.04
Box that and there is your answer.
Answer:
Explanation:
90
Th
232.04
