Answer:
– 2.5 m/s²
Explanation:
We have,
• Initial velocity, u = 180 km/h = 50 m/s
• Final velocity, v = 0 m/s (it stops)
• Time taken, t = 20 seconds
We have to find acceleration, a.
[tex]\longrightarrow[/tex] a = (v ― u)/t
[tex]\longrightarrow[/tex] a = (0 – 50)/20 m/s²
[tex]\longrightarrow[/tex] a = –50/20 m/s²
[tex]\longrightarrow[/tex] a = – 5/2 m/s²
[tex]\longrightarrow[/tex] a = – 2.5 m/s² (Velocity is decreasing) [Answer]
Samir is watching waves hit a beach. He notices that as the waves get closer to the shore (where the water is shallow), they change direction. Which type of wave effect is he seeing?
Answer:
refraction
Explanation:
When a wave crosses a boundary between media at an angle other than normal to the boundary, it will be refracted by an amount depending on the relative speeds of the wave in the different media.
The change in direction that Samir observes is due to refraction of the wave as it slows down in shallower water.
Frosted glass is an example of which type of material?
it is an example of a translucent object
A 15-kg cart filled with apples is sitting at the top of a bill that is 21 m high. The apples in the
your cart have a mass of 33 kg. What is the potential energy of the cart and the apples? Round your answer to the nearest tenth
Hi there!
Recall the equation for gravitational potential energy:
[tex]U = mgh[/tex]
U = GPE (J)
m = mass (48 kg)
g = acceleration due to gravity (9.8 m/s²)
h = height (21 m)
Plug in the givens and solve.
[tex]U = (15 + 33)(9.8)(21) = \boxed{9878.4 J}[/tex]
A large bag of feathers and a steel block balance each other on some scales.
What does this show about the masses and the weights of the bag of leathers and the stoel
block?
Answer:
they have an equal amount of weight between the two objects the steel block and the bag of feathers
Since temperature increases when the average kinetic energy of particles increases, what is happening to the added energy when the temperature remains constant while a substance is melting or boiling?.
Latent heat is the heat required to change the phase. When the temperature remains constant during melting or boiling the added energy is employed in the phase change process.
What is average kinetic energy?The average kinetic energy (KE) is defined as the one-half of the mass of each gas molecule times multiplied by the square of RMS velocity.
[tex]KE = \frac{1}{2}m (V_{rms})^{2}[/tex]
where,
KE is the kinetic energy
m is the mass of each molecule
(V)rms is the RMS velocity
As we know since the temperature is increasing the average kinetic energy of the particle increases. So the added energy is utilized in the sensible heat due to which the temperature of the body increases resulting in the increase in average kinetic energy
But when the temperature remains constant during melting or boiling the added energy is converted into latent heat energy utilized to convert the phase of a substance.
To learn more about the average kinetic energy refer to the link ;
https://brainly.com/question/24134093
20 POINTS
What is an endothermic reaction?
Answer:
An endothermic reaction is a chemical reaction in which more energy is needed to break bonds in the reactants than is released when new bonds form in the products.
A constant input of energy, often in the form of heat, is needed to keep an endothermic reaction going.
Explanation:
A would be the answer
Answer:
A reaction that contributes energy to the surroundings
Explanation:
When energy is taken in from the Surroundings, the temperature of the surroundings decreases
Which is the Colour of cleanliness
* A 5 kg ball is dropped from a height of 20 m. How much kinetic energy will it have 10 m above the ground? a. 490 J b. 392 J C. 480 J d. 100 J
Answer:
A. 490
Explanation:
soln
mass = m = 5kg
Height = h = 10m
Acceleration due to gravity = g = 9.8ms²
K.E = 1/2 × mass × (velocity)²
Recall from equations of motion
v² = u² + 2gh
Therefore,
K.E = 1/2 × mass × ( u² + 2gh)
K.E = 1/2 × 5 × ( 0² + 2×10×9.8)
K.E = 1/2 × 5 × 196
K.E = 1/2 × 980
K.E = 490 Joules
what is international system of units?
There are some points on a standing wave that never move. What are these points called?.
Answer:
A common term is "nodes", also minimums.
A 50N crate is lifted 0.86m from the ground then is allowed to drop losing 15 J of energy. What is the new height of the crate?
We have that the new height of the crate is mathematically given as
Hn=0.56
New height of the crate
Question Parameters:
A 50N crate is lifted 0.86m from the ground
then is allowed to drop losing 15 J of energy.
Generally the equation for the Potential energy is mathematically given as
P.E=mgh
Where
m=50/9.8
Therefore
h=15/(50/9.8*9.8)
h=0.3m
New height
0.86-0.3
Hn=0.56
For more information on Measurement visit
https://brainly.com/question/17972372
Can light energy from the sun be used to directly fuel cellular work?.
Answer:
None of the light energy from the sun can be used directly to fuel cellular work. First it must be captured in the bonds of a molecule called adenosine triphosphate (ATP).
Explanation:
Activity of integration Most of the people in a certain village called Bileafe where much tobacco is grown bought vehicles after tobacco sales. However, no sooner than later many of the vehicles either broke down or they were parked at home since fuel became expensive to afford. As a student of chemistry, develop a message for the owners of the cars in this village explaining why the vehicles should be kept well even if they are spoilt, where they should be kept, and what kind of change they will undergo if not properly kept. You can use the resources to help you develop the message.
They will be instructed to park their cars in a cool dry environment in order to prevent rusting of the vehicle parts.
What is Rusting?This is defined as a chemical change in which Iron reacts with Oxygen to form a new substance called Iron oxide.
Iron oxide is usually brownish in color and further corrodes the metal parts. It is also referred to as a Chemical change in chemistry due to new substance being formed.
Read more about Rusting here https://brainly.com/question/153893
A 20 N force pulls to the right and friction pulls 5 N. If the mass is 5 kg, find the acceleration.
Answer
3ms^-2
_________
At which position would the electric force be greatest?
CI
The image shows the electric field lines around two
charged particles
O 1
02
1
2
O 3
O 4
3
*4
Helps pls
Explanation:
F = qE
where E is an electric field.
The denser lines of electric force are, the stronger electric field will be.
Since 4 is densest part, electric force on 4 is would be greatest.
The electric field would be stronger the denser the lines with electric force are. Since part 4 is the densest, its electric force would be greatest. Therefore, the correct option is option 4.
The force acting on the items is referred to as the electric force. When two electrons and two protons are put at equal distances, the electric force that separates them is equivalent to the electrostatic charge between the two.
The electric force primarily reliant on the quantity known as electric charge rather than the object's mass. Forces involving charges are the subject of electrostatics. Static refers to charges that aren't moving, or are moving very slowly. The electric field would be stronger the denser the lines with electric force are. Since part 4 is the densest, its electric force would be greatest.
Therefore, the correct option is option 4.
To know more about electric force, here:
https://brainly.com/question/30508497
#SPJ7
An answer will get you mark as brainliest! This question is in the attachments.
Answer: I am quite sure your answer here is D.
Explanation: It just seems like the only possible answer to me have a good day :D
why a bulb contains coiled wire?
Answer:
The filament is coiled to give it greater length. If the filament was just a piece of straight wire it would only give out a small amount of light. By curling the wire into a coil, a very long length of wire can be stored in a small space. When electricity flows through the coil it can give out much more light.
A 2035 kg Oldsmobile traveling east on Saginaw Street at 15.8 m/s is unable to stop on the ice covered intersection for a red light at Abbott Road. The car collides with a 4012 kg truck hauling animal feed north on Abbott at 10.5 m/s. The two vehicles remain locked together after the impact.
Required:
Calculate the velocity of the wreckage immediately after the impact.
The velocity of the wreckage immediately after the impact is mathematically given as
v=12.284m/s
The velocity of the wreckageQuestion Parameters:
A 2035 kg Oldsmobile traveling east on Saginaw Street at 15.8 m/s is unable to stop on the ice covered intersection for a red light at Abbott Road.
The car collides with a 4012 kg truck hauling animal feed north on Abbott at 10.5 m/s
Generally the equation for the speed after collision is mathematically given as
mu +MU = ( m + M) v
Therefore
v = ( 2035*15.8 + 4012*10.5 ) / ( 2035+ 4012)
v=12.284m/s
For more information on Speed
https://brainly.com/question/4931057
Light travels in waves. Which of the following statements about light waves is NOT true?
A. They travel i’m straight lines.
B. they can travel through any substance
C. They can come from natural or artificial sources.
D. They change direction when they are reflected or refracted
The direction of light wave changes when they are reflected or refracted. So, all the statements are true.
What is meant by light wave ?Light waves are defined as the electromagnetic waves made of smaller, energy carrying particles called photons.
Here,
Light is an electromagnetic radiation that can have the properties of both waves and particles.
Light waves can travel in straight lines in the transparent medium like air, glass, still water, etc.
Light waves can travel through any medium or substances.
Sources of light are of two types, natural source and artificial source.
Reflection and refraction are the two properties of light.
Reflection is the phenomenon exhibited by light through which a ray of light incident on a smooth, reflecting surface, gets bounced back. Thus, during reflection, the direction of the light ray changes.
Refraction is the phenomenon by which the the speed of the light decreases when light wave travels from a lighter medium to denser medium. The light wave will bend towards the normal line. Thus, during refraction, the direction of light wave changes.
Hence,
The direction of light wave changes when they are reflected or refracted. So, all the statements are true.
To learn more about light waves, click:
https://brainly.com/question/25588186
#SPJ2
To scientists, amount of work done depends on...
Select one:
a. force applied to an object and distance it moved.
b. speed of an object and distance it moved.
c. mass and acceleration of an object.
d. weight and velocity of object.
Answer:
Option A
Force applied to an object and distance it moved.
Explanation:
The size of the force applied and the distance something moves.
W = F • d
-TheUnknownScientist 72
SOME 1 HELP ME ASAP
Which 2 piece ls of data indicate that Jupiter resides in the outer region of the solar system?
1. It is primarily composed of hydrogen and helium.
2. It contains one natural satellite, The Moon.
3. It is hottest plant in the solar system.
4. It’s surface gases form into colorful bands.
5. It’s metal surface upon which one can stand.
Answer:
hydrogen and helium
Explanation:
From left to right, the outer planets are Jupiter, Saturn, Uranus, and Neptune. The gas giants are made up primarily of hydrogen and helium, the same elements that make up most of the Sun.
A string exerts a force of 20 N on a box at an angle of 38° from the horizontal. What is the horizontal component of the force on the box?
Answer:
15.8 N
Explanation:
The component in a given direction is the magnitude of the applied force, multiplied by the cosine of the angle between its application and the direction of interest.
The horizontal component is ...
(20 N)cos(38°) ≈ 15.8 N
A string exerts a force of 20 N on a box at an angle of 38° from the horizontal. What is the horizontal component of the force on the box?
answer;15.8 N
Which of the following statements about nutrition is true?
Complex carbs taste bland and digest slower than simple carbs.
Eating the right amount of dietary fiber promotes regular bowel movements and helps
prevent constipation.
You've got to eat enough protein so your body can grow, stay in shape, and repair itself.
all of these
Answer:
nobody knows
Explanation:
what is density
what is density
Answer:
The density of a substance is the relationship between the mass of the substance and how much space it takes up
Explanation:
thats it take my word hope thats what u meant
Density is a measure of mass per unit of volume. Density is a measure of mass per volume. The average density of an object equals its total mass divided by its total volume. An object made from a comparatively dense material (such as iron) will have less volume than an object of equal mass made from some less dense substance (such as water). Perhaps the highest density known is reached in neutron star matter. The singularity at the centre of a black hole, according to general relativity, does not have any volume, so its density is undefined.
which of these questions could best help you evaluate the advice from this website selling supplements?
A .does the author have a large following?
B. is the advice supported by empirical evidence?
C. is the advice easy to follow ?
D. how much do supplements cost?
The Answer to this question is Number B.
Answer :- B
During what phase of the moon is the moon up only during the night hours and all night long?.
Answer:
The Full Moon.
Explanation:
A full moon is made when the sun reflects off the moon's surface closest to us. this causes the moon to look bright at night, and dissapear during the morning.
in an atom is the number of protons greater, less than or equal to the number of electrons?
Answer:
The number of electrons and protons are always equal in a neutral atom. The total number of protons in the nucleus of an atom gives us the atomic number of that atom.
Explanation:
hope it will help you have a great day bye and Mark brainlist if the answer is correct
[tex]kai6417[/tex]
PLEASE HELP WILL MARK BRAINLIEST !! Which documentation is a car insurance company unlikely to ask for when a person is applying for coverage?
A. the type of car and when it was made
B. the number of accidents the driver had in the past
C. proof that the driver has life insurance
D. proof of how many miles the car has driven
Answer:
C, proof that the driver has life insurance.
Explanation:
PLEASE HELP
Approximate grams per spoonful:
g
You are observing a star about 95 trillion km (10 light-years) away. How old is the most recent information you can get about this star
The most recent information you can get about this star is near 10 years old.
What is a light-year?A light-year is a distance unit, that represents the distance that light can travel in one year.
Now, we know that nothing can move faster than the speed of light, and the only information that we can get about this star comes through light (electromagnetic waves). And these waves travel at the speed of light.
So these waves would need at least 10 years to travel from the start to the satellites that can detect them, this means that the most recent information that you can get about this star is actually 10 years old.
If you want to learn more about electromagnetic waves, you can read:
https://brainly.com/question/14015797