F = mv²/r = m.a
a = v²/r
a = 25²/(2.75 x 10³)
a = 0.227 m/s²
Which statements describe vectors?
Answer:
Vectors have a size and direction. Each of the existing vector quantity has a magnitude and a direction. Having direction along with the magnitude is the difference of a vector quantity from a scalar quantity. Vectors are indicates with arrows.
Vectors are quantities which have both magnitude and direction.
What are vectors?Vectors are quantities which have both magnitude and direction.
Vectors are different from scalars which have only magnitude but no direction.
Vectors are represented by arrow written above them.
The sum of vectors are not obtained by ordinary algebraic additions, but by vector additions.
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my Exams are coming.so, please tell me some ways to score good marks?
Instead of asking this question go and study
Topics:
1. Explain the causes of ocean currents around the world.
Refer to at least 2 types of heat transfers.
Refer also to the specific heat capacity of the substances involved.
2. Explain features of a thermal food container that can help to keep food
warm.
Refer to at least 2 types of heat transfers.
Refer also to the specific heat capacity of the materials used.
I need you to make me an invented poem written please not in image
what is the velocity of a plane that traveld 3000 miles from new york to california in 5.0 hours
3 How could you test whether a plastic rod that has been given an electric charge would attract or repel a magnet? Describe your method and include a diagram. What result would you expect to observe?
The charged plastic rod has affinity for insulting items. So, things like saw dust, paper pieces get attracted to it. On the other hand, magnet has affinity for magnetic material like iron. So, it will attract iron pieces.
Consider the electric field lines shown in the diagram below. From the diagram, it is apparent that object A is ____ and object B is ____.
which chemical equation is balanced?
Answer:
C no.Explanation:
Mark me me brainliest plz i really need it （⌒▽⌒）help please only answer if you really know i need this ill give 50 points ;( thx
92.BIO In an emergency situation,
a person with a broken forearm
ties a strap from his hand to clip
on his shoulder as in Figure P8.92.
His 1.60-kg forearm remains in a
horizontal position and the strap
makes an angle of 0 = 50.0° with
the horizontal. Assume the fore-
arm is uniform, has a length of
l = 0.320 m, assume the biceps
muscle is relaxed, and ignore the
mass and length of the hand. Find
(a) the tension in the strap and
(b) the components of the reac-
tion force exerted by the humerus
on the forearm.
Based on the principle of equilibrium of forces:
the tension T, in the strap is 10.2 Nthehorizontal component of the reaction, Rx is 6.56 Nthevertical component of the reactionary force, Ry is 7.84 NWhat is tension?Tension is a type of force that is transmitted through a flexible medium such as a cable, wire or string pulled tight by forces acting from opposite ends.
The tension in the strap is calculated as follows:
Taking sum of moments from the right end as equal to zero:
mg × l/2 = Tsinθ × l
T = mg/2sinθ
T = 1.60 × 9.8 / 2 sin 50°
T = 10.2 N
Calculating the components of the reac-
reac-tionary force:
Horizontal component is RxVertical component is RyFrom Newton's third law:
Rx = Tcosθ
Rx = 10.2 × cos 50°
Rx = 6.56 N
Ry - Tsinθ = 0
Ry = Tsinθ
where;
T = mg/2sinθ
Ry = mgsinθ/2sinθ
Ry = mg/2
Ry = 7.84 N
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When someone hits a wooden board, what is the action force? What is the reaction force?
Answer:
The board did exert an equal and opposite force, but your mass is considerably greater than the mass of the board so all the friction between you and the ground keeps you from accelerating.
If you punched the board while standing on perfectly slippery ice, or in a vacuum, you would accelerate also, but at a much smaller rate than the board due to the mass difference.
If you could ignore all losses (friction, the board breaking, etc.) then all Newton's 3rd Law really is saying is that the center of mass of the system doesn't change when you punch the board. So the board accelerates in the direction of your punch and you move away from it at rates that keep the system center of mass constant.
Explanation:
Among the substances given below which cannot be electrified by friction
amber, plastic, hacksaw blade
Answer:
Hacksaw blade because it is metal.
state the Newton's law Newton's second law of motion
Answer:
It states that the time rate of change of the momentum of a body is equal in both magnitude and direction to the force imposed on it.
Answer:
Newtons Second law of motion states that"The rate of change of momentum is directly proportional to the force applied"
Which of the following would most likely cause a decrease in the quality supplied
AWhich of the following would most likely cause a decrease in the quantity supplied? A decrease in price.
Does anyone know the answer to that
According to the diagram, which choice has the shortest wavelength?
A) infrared
B) red visible light
C) blue visible light
D) yellow visible light
Answer:
Blue visible light
Explanation:
the distance between the crests of the waves is the shortest
A rollercoaster is designed as shown below. If the roller coaster starts at the top of the
first hill from rest, describe what will happen to the rollercoaster. How could you fix this
problem?
Imagine you are mpho:how can you help your friend (phenyo) not to be influenced by media? you really feel she needs some help because she is neglecting her school work write 2 paragraphs
One of the ways to help someone not to be influenced by media is:
Encourage independent thinking.Let her know that she should make sure the information she is consuming is free from bias and is factual.What is Media Influence?This refers to the effects and reactions which the mass media has on the people who listen to them by shaping their views and by controlling the narrative.
With this in mind, we can note that if a person is overtly influenced by the media, then such a person lacks independent thinking and becomes emotional by what he watches on the television or reads from an online source.
This can be changed through the encouragement of independent thinking, and the need to check for factual information from the media news and also to focus more on studies.
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How much work is needed to move horizontally a body 20m by a force of 30N the angle between the body and the horizontal surface is 60 degree?
Work done in moving the body horizontally is 300 J.
What is meant by work done by an object ?Work done by an object is defined as the dot product of the force and displacement of the object.
Here,
Displacement of the body, s = 20 m
Force applied on the body, F = 30 N
Angle made with the horizontal, θ = 60°
Work done in moving the body,
W = Fs cosθ
W = 30 x 20 x cos60
W = 600/2
W = 300 J
Hence,
Work done in moving the body horizontally is 300 J.
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How could you increase the kinetic Energy of an object without changing
its mass or gravity? *
Answer: Height
Explanation:
You could raise it further off the ground.
Straight line AB connects two point sources that are 5.00 m apart, emit 300 Hz sound waves of the same amplitude, and emit exactly out of phase.
(a) What is the shortest distance between the midpoint of AB and a point on AB where the interfering waves cause maximum oscillation of the air molecules?
(b) What are the (b) second and (c) third shortest distances?
What does Schrödinger's cat explain in quantum mechanics?.
Answer:
Schrodinger's cat explains that the state of an object is not known until
an observer observes the state - therefor if the cat is in an enclosed box and the probability of some toxic substance escaping is 1/2, the cat is 1/2 dead and 1/2 alive until its actual state is observed by an external observer. An old saying "is the moon really there if no one is looking at it"
To view an enlarged upright image of an object through a simple magnifier, where must the object be located?.
Answer:within the focal length of the lens, provided the focal length is shorter than the near point distance.
Explanation:Hope it helps
What is the formula for the initial temperature
Q = mc(T - t0) it is the formula for the initial temperature
79.8329 + 3.179 + 6.5263
And round
Answer:
90.0
Explanation:
Because 78.8329 + 3.179=83.0119
83.0119 + 6.5263=89.5382 rounded up is 90.0000
Hope this helps have a awsome afternoon:)
A student is performing an experiment comparing sound and light waves. The student gathers the following data. A 3 column table with 3 rows labeled Speed of Sound. The first column is labeled medium with entries ice, water, steam. The second column is labeled temperature in degrees Celcius with entries 0, 25, 100. The last column is labeled speed of sound in meters per second with entries 3200, 1500, 346. A second 3 column table with 3 rows labeled speed of light. The first column is labeled medium with entries air, water, glass. The second column is labeled index of refraction with entries 1. 00, 1. 33, 1. 57. The last column is labeled speed of light in meters per second with entries 2. 99 times 10 Superscript 8 Baseline, 2. 26 times 10 Superscript 8 Baseline, 1. 91 times 10 Superscript 8 Baseline. What conclusion does the student most likely make based on this data? Light waves always travel the same speed; however, the speed of sound is determined by the medium that it travels through. All sound waves always have the same energy, so the temperature of the medium does not affect wave speed. Light needs to vibrate particles, so it travels fastest in tightly packed solids, while sound does not need a medium, so it travels fastest in a gas. Tightly packed particles in solids slow down the light waves; however, sound waves make particles bounce into each other, so they travel faster in solids.
Answer:
Tightly packed particles in solids slow down the light waves; however, sound waves make particles bounce into each other, so they travel faster in solids. (D).....
Tightly packed particles in solids slow down the light waves; however, sound waves make particles bounce into each other, so they travel faster in solids.
What is sound wave?Sound wave is a mechanical wave because it requires material medium for its propagation.
In solid, the particles or atoms are closely packed together, which usually slow down light waves causing a greater speed when they bounce on each other.
Thus, we can conclude the following based on the data;
Tightly packed particles in solids slow down the light waves; however, sound waves make particles bounce into each other, so they travel faster in solids.
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A 200-kg boulder is 1000-m above the ground.
a) What is its potential energy when it is 1000-m above the ground?
Answer: 1,960,000 J
Explanation:
Does the velocity of the center of mass change in a collision.
Answer:
The velocity of the system's center of mass does not change, as long as the system is closed. The system moves as if all the mass is concentrated at a single point.
Which best describes the current atomic theory? (1 point) a Since it is only a theory it should not be used in practice. b It has not been tested enough to be useful for developing technology. c It is the most powerful explanation scientists have to offer at this time. d There is very little chance it will be changed in the future.
Answer:scientist try to fix it
Explanation:
An object that allows light to pass through is said to...
Select one:
a. absorb light.
b. transmit light.
c. reflect light.
d. refract light.
A
Explanation:
.
it's let's the light to pass
An object like glass that allows light to pass through is said to refract light.
PROPERTIES OF WAVESFour general properties of waves are;
RefractionReflectionInterferenceDiffractionAn object that allows light to pass through is said to refract light because of the followings
If it absorbs, it will not transmit the light.If it reflect, some portion of the light will not be transmitted.Light refract when moving from one medium to another.Therefore, An object like glass that allows light to pass through is said to refract light.
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1. A scientist wants to raise the temperature of a
100 gram sample of glass from -45°C to 15°C. How
much heat energy is required to cause this change?
Specific heat of glass 0.800J/gºC.
Here Given,
Mass = 100 gram
Change in temperature = -45°C - 15°C => -55°C
Specific heat of glass (c) = 0.800J/g°C
★Heat Energy (Q) = mc∆t
➙ 100g × (-55)°C × 800/1000 J/g°C
➙ 10 × (-55) × 8
➙ -4400 J
★ Hence, Heat Energy is required to cause this change -4400 J = 4400J
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