How to find acceleration?
Answer:
a=(v-u)/t is how you find acceleration.
Which three characteristics do mechanical waves and electrocmagnetic
waves share?
A. The waves begin with a disturbance.
O B. The waves transfer energy from its source.
C. The waves and their energy move outward from the source.
D. The waves and their energy can travel through empty space.
Answer:
It is A, B, and C
Explanation:
I just took the test!
The three characteristics mechanical waves and electromagnetic waves share are:
A. The waves begin with a disturbance.
B. The waves transfer energy from its source.
C. The waves and their energy move outward from the source.
What are mechanical waves and electromagnetic waves?Usually, waves transfer energy from one place to another. Mechanical waves transfers via matter where as electromagnetic waves transfers via light. Both mechanical waves and electromagnet (light) waves measured through amplitude, wavelength, frequency and both will get transmitted, refracted, reflected, absorbed, diffracted when they react with matter. Both the electromagnetic waves and mechanical waves are transverse in nature but the mechanical waves can also be in longitudinal.
So, many characteristics were similar for mechanical waves and electromagnetic waves.
Hence, Option A, B, C are the three characteristics.
Learn more about the waves,
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HELP ASAP TIMED TEST
A snowball is dropped from a height of H and reaches the ground with a speed of V. If you want to double the speed that the snowball has when it reaches the ground, at what height should you drop it from?
a
2H
b
4H
c
√2H
d
8H
e
16H
Answer:
Correct choice: b 4H
Explanation:
Conservation of the mechanical energy
The mechanical energy is the sum of the gravitational potential energy GPE (U) and the kinetic energy KE (K):
E = U + K
The GPE is calculated as:
U = mgh
And the kinetic energy is:
[tex]\displaystyle K=\frac{1}{2}mv^2[/tex]
Where:
m = mass of the object
g = gravitational acceleration
h = height of the object
v = speed at which the object moves
When the snowball is dropped from a height H, it has zero speed and therefore zero kinetic energy, thus the mechanical energy is:
[tex]U_1 = mgH[/tex]
When the snowball reaches the ground, the height is zero and the GPE is also zero, thus the mechanical energy is:
[tex]\displaystyle U_2=\frac{1}{2}mv^2[/tex]
Since the energy is conserved, U1=U2
[tex]\displaystyle mgH=\frac{1}{2}mv^2 \qquad\qquad [1][/tex]
For the speed to be double, we need to drop the snowball from a height H', and:
[tex]\displaystyle mgH'=\frac{1}{2}m(2v)^2[/tex]
Operating:
[tex]\displaystyle mgH'=4\frac{1}{2}m(v)^2 \qquad\qquad [2][/tex]
Dividing [2] by [1]
[tex]\displaystyle \frac{mgH'}{mgH}=\frac{4\frac{1}{2}m(v)^2}{\frac{1}{2}m(v)^2}[/tex]
Simplifying:
[tex]\displaystyle \frac{H'}{H}=4[/tex]
Thus:
H' = 4H
Correct choice: b 4H
A 5 kg ball is suspended on one cable. Calculate the tension in the cable
Answer:
49N
Explanation:
F=ma
We know the mass is 5kg, and since the ball is suspended on one cable, the acceleration is g, 9.8m/s^2
F=5kg*9.8m/s^2
= 49N
Hope this helps!
What happens to matter during chemical changes?
The surface of the Earth changes from processe such as erosion. Which of these changes to Earth's surface is an example of erosion? A. an active volcano starting to erupt B. a rock turning a red color from oxygen C. a waterfall breaking the rocks below it D. the wind picking up dust and carrying it
Answer:
D. the wind picking up dust and carrying it
Explanation:
Erosion is a process in which an agent transfer the top soil to another region, thereby exposing the lower soil. These agents have the ability to move the top layer of soil and deposit it at another place. The major agents in this case are; a running or flowing body of water and wind.
Therefore, the change to the Earth's surface that is an example of erosion is the wind picking up dust and carrying it. Thereby exposing the lower layers.
new stars form from ?
Help please!!!
if superman at 90kg jumps a 40m building in a single bound how much work does superman perform
Answer:
5 years worth of work (aka all of the homework i currently have)
If an object is moving at a constant velocity, it means that?
A child on the high dive has a mass of 40 kilograms. If the high dive is 10 meters in the air, what is the potential energy?
options-
1. 400 joules
2. 3920 joules
3. 4 joules
If the atomic weight- # of protons = # of neutrons, then how many neutrons does neon have?
Answer:
atomic weight 20.180
protons 10
neutrons 2,8
Explanation:
Light that enters your eye strikes cells in the back of your eye
true
False
Answer: True
Explanation: Light enters your eye through the lens which then hits the retina which is located in the back of your eye.
HELP ASAP TIMER
Your younger brother gets a new toy car as a present. He winds up the toy, puts it on the ground and watches it accelerate for 5 seconds. You can explain how to find the net force acting on the toy car for the 5 seconds while accelerating by the following:
a
Use a meterstick and stopwatch to measure the distance the car travels for the 5s.
b
Use a balance to determine the mass of the car. Use a motion sensor to measure the speed of the car at a time of 0s and at time of 5s .
c
Use a balance to determine the mass of the car. Use a meterstick to measure the distance the car travels for the 5s .
d
Use a motion sensor to measure the speed of the car at a time of 0s and a time of 5s . Use a meterstick to determine the distance the car travels for 5s .
Answer:
b Use a balance to determine the mass of the car. Use a motion sensor to measure the speed of the car at a time of 0s and at time of 5s .
Explanation:
The right way to measure the net force on the car is take the measurement of its mass then find the speed of the car within the time 0s to 5s.
This is because the net force acting on car is given as;
Force = mass x acceleration
By using the balance, the mass is determine
Acceleration is the rate of change of velocity with time.
Acceleration = [tex]\frac{v - u}{t}[/tex]
v is the final velocity
u is the initial velocity
t is the time taken
Now,
Force = mass x [tex]\frac{v - u}{t}[/tex]
how many pixels would image contain if it's Dimension are 400 x 200 pixels
Answer:
800 pixels
Explanation:
400*200=800
Your pulse is caused by pressure of the blood on the artery wall, and it corresponds to your heart beat.
A. true
B. false
weeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee true eeeeeeeeeeeeeeeeeeeee
Answer:
true
Explanation:
sorry if im wrong
What is the weight of the body under the influence of a force of 10N reaches a speed of 1.5 m / s in 3s?
Answer:
Explanation:
F=ma
F=10N
A=v-u upon t
=1.5-0 upon 3
=0.5m per second squared
Then do force divided by. Accelaration and multiply by gravity.
PLEASEEEEE HELLLLLPPPPPPP
Answer:
A or B(the answers)
Explanation:
they seem like the most right
Answer:
I'm pretty sure it's b
Explanation:
1.) Describe the shape, movement of particles, and the volume of a solid.
2.) Describe the shape. movement of particles, and the volume of a liquid.
30 points please help me ??? ASAP
Answer:
Solids have a definite shape and volume, its particles vibrate slowly.
Liquids have no definite shape, the particles move randomly around its container, and they have a fixed volume.
Thor deja caer su martillo de la torre Torre Stark que tiene 95 pisos, si al llegar el Mjolnir al piso han transcurrido 9.5 segundos. Determina: a) La velocidad con la que el Mjonir golpea el suelo
Answer:
La magnitud de la velocidad con la que Mjonir golpea el suelo es 93.2 m/s.
Explanation:
Podemos encontrar la velocidad con la que el martillo golpea el suelo usando la siguiente ecuación:
[tex] v_{f} = v_{0} - gt [/tex] (1)
En donde:
[tex] v_{f}[/tex]: es la velocidad final =?
[tex] v_{0}[/tex]: es la velocidad inicial = 0 (lo deja caer)
g: es la gravedad = 9.81 m/s²
t: es el tiempo = 9.5 s
Al reemplazar los valores anteriores en la ecuación (1), tenemos:
[tex] v_{f} = 0 - 9.81 m/s^{2}*9.5 s = -93.2 m/s [/tex]
El signo negativo se debe a que el vector velocidad está dirigido hacia abajo en el eje vertical (y).
Por lo tanto, la magnitud de la velocidad con la que Mjonir golpea el suelo es 93.2 m/s.
Espero que te sea de utilidad!
A pulse with a height of 20 cm and a length of 30 cm travels with a speed of 400 cm/s through a spring that has been stretched so it is 800 cm long. If we want to send another pulse through the spring that will have a different speed, which of the bolded words should we change? List all that will change the speed of the wave.
Answer:
To send a pulse of different speed, change the tension or stretch on the spring
Explanation:
A pulse is a single disturbance of a particle is a medium. The pulse has an amplitude or and a pulse length in the medium. The speed of the pulse is dependent on the amount of strain or tension ( stretch) applied to the medium. The speed also determines the length of the pulse but is unaffected by the or amplitude of the pulse.
Calculate the amount of work must a 60 kg runner do to
accelerate from rest to a velocity of 2 m/sec?
Answer:120j
Explanation:
The amount of work must a 60 kg runner do to accelerate from rest to a velocity of 2 m/sec is 120 joules.
To find the work done, the given values are,
Mass = 60 kg
Velocity = 2 m/sec.
What is Kinetic energy?The amount of work can be expressed by the Kinetic energy of the runner. Energy can be defined as the capacity of an object or physical body to perform work. Thus, energy is typically measured in Joules (J).
Kinetic energy can be regarded as form of energy posses by an object when it's in motion.
Total energy = kinetic energy + potential energy
Thus, Kinetic Energy, KE = (1/2) (m) (v²)
KE =1/2 (60 kg) (2² m²/s²)
KE = 120 Joules.
That's the amount of energy that has to come from somewhere, in order to boost him to that speed.
The amount of work must a 60 kg runner do to accelerate from rest to a velocity of 2 m/sec is 120 joules.
Learn more about Kinetic Energy,
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Which label on the wheelbarrow shows the pivot?
A food packet is dropped from a helicopter during a flood-relief operation from a height of 750 meters. Assuming no drag (air friction), what will the velocity of the packet be when it reaches the ground?
Answer: 121.2 m/s
Explanation:
Here we will use the conservation of energy.
We can write the total energy of an object as:
E = K + U
For this particular case we have:
K = kinetic energy = (m/2)*v^2
U = potential energy = m*g*h
where:
m = mass of the object.
g = gravitational acceleration = 9.8m/s^2
h = height at which the object is dropped, in this case 750m
v = velocity of the object.
Right when the packet is dropped, it's velocity is equal to zero, this means that there is no kinetic energy and only potential energy, then we have:
Ei = Ui = m*9.8m/s^2*750m = m*(7350m^2/s^2)
And when the object is about to hit the ground, h will be almost equal to zero, this will mean that we will have only kinetic energy, and because of the conservation of energy, this final energy must be the same as the initial energy, then we will have
Ei = Ef
m*(7350m^2/s^2) = Ef = Kf
m*(7350m^2/s^2) = (m/2)*v^2
We can divide by m in both sides to get:
(7350m^2/s^2) = (1/2)*v^2
√( 2*(7350m^2/s^2)) = v = 121.2 m/s
Then the velocity of the packet when it reaches the ground is 121.2 m/s
To balance the forces on the box what direction must you push?
1- Right
2- Left
3- Down
4- Up
Which of the following situations has more kinetic energy than potential energy?
a rock at the edge of a cliff
an archer’s bow that is drawn back
a rolling bowling ball
a car waiting at a red light
Answer:
C. a rolling bowling ball
I just answered this question on my quiz.
What are all stars made of
help it's for my civics class
ANSWER: D. Rule of Law
is the answer
d. rule of law
rule of law .
How do ions help your brain?
Please help asdfghjkll
Answer:
B
Explanation:
in comparison, the sun is a soccer ball, and the earth is a head of a needle, and the moon is a speck of salt
A rat runs 2m right, turns around and runs 3m left. Then goes 2m right. What is its displacement?
A. 1m right
B. 1m left
C. 7m
D. 7m left
Answer:
Explanation:
I think this answer would be 1m to the left.