Answer: An exothermic reaction is a chemical reaction in which less energy is needed to break bonds in the reactants than is released when new bonds form in the products. During an exothermic reaction, energy is constantly given off, often in the form of heat.
Explanation: An exothermic reaction is a chemical reaction in which less energy is needed to break bonds in the reactants than is released when new bonds form in the products. During an exothermic reaction, energy is constantly given off, often in the form of heat.
Hope this helps^^
A beaker contains 0.42 L of water. The beaker's volume is ___ milliliters.
Answer:
ans is 420ml
Explanation:
0.42L×1000ml
420ml
A ball is thrown upward from a cliff. The ball rises to its maximum height and then falls into the valley below. Suppose the ball is thrown upward at 30m/s and lands 9s after it is thrown. What is the height of the cliff?
Answer:
The height of the cliff is approximately 127.31 meters
Explanation:
The given parameters are;
The upward speed of the ball = 30 m/s
The time after the ball is thrown before it lands = 9 s
We have;
The time to maximum height;
v = u - g·t
Where;
v = The velocity at maximum height = 0 m/s
u = Initial velocity = 30 m/s
g = The acceleration due to gravity = 9.81 m/s²
∴ 0 = 30 - 9.81 × t
t = 30/9.81 = 3.06 s
The maximum height can be obtained from;
v² = u² - 2·g·s
v = 0 m/s
u² = 2·g·s
30² = 2 × 9.81 × s
s = 30²/(2×9.81) = 45.87 m
The time from maximum height to landing = 9 - 3.06 = 5.942 s
The height to landing
s = u·t + 1/2·g·t².
Here, u = 0 m/s
s = 0×5.942 + 1/2×9.81×5.942² = 173.1766 m
s = 173.1766 m.
The height of the cliff = 173.1766 m. - 45.87 m. ≈ 127.31 m.
A hill that has a 31.7% grade is one that rises 31.7 m vertically for every 100.0 m of distance in the horizontal direction. At what angle is such a hill inclined above the horizontal
The grade is also the tangent of the angle above horizontal.
The angle whose tangent is 0.317 is called the "arctangent" of 0.317
It's 17.6 degrees.
2. What is the kinetic energy of a 25 kg object traveling at 15 m/s?
Answer:
The kinetic energy is
= 1250 j
Explanation:
The kinetic energy is
KE = 1/2mv²
The mass is m = 25kg
The velocity is v = 10ms^1
So, KE = 12.25.10² = 1250 j
Claire lost weight thanks to the support and encouragement of her friends. They helped her stick to a healthy diet and pushed her to engage in physical exercise every day. Identify the FaceTime that helped her lose weight
Answer:
hello the options to your question is missing below are the options
culture
heredity
physical environment
social environment
answer : social environment
Explanation:
Claire ability to lose weight due to the encouragement and support of her friends shows that she was ability to achieve her goal due to her social circle ( friends ). therefore the face time that helped her lose weight is her social environment and not culture nor any other option as mentioned above.
social environments help/play a vital role in individual's life a lot as long as every human being is a social being
NEED SOME HELP!!
How are electromagnetic spectrum or waves different from other waves?
Answer:
Electromagnetic spectrum is the arrangement of all kinds of radiation according to their frequency and wavelength. They don't require a material medium for their propagation.They are transverse waves that travel in a direction perpendicular to the direction of vibration.
Whenever you push an object across a frictional surface, it starts out taking a lot of force to push to get the object moving. However, once the object starts moving, it is much easier to keep it moving. What does this tell you about one of the main differences between static and kinetic friction?
A) Static friction only depends on the surface material, while kinetic friction only depends on the motion
B) Kinetic and Static friction are the exact same thing
C) Static friction and kinetic friction are combined in one at all times, but static friction is just not seen during the motion
D) Static Friction is much stronger than kinetic friction, so it takes more force to get an object moving than it does to keep it moving
Answer:
The correct answer is D. Static friction is much stronger than kinetic friction, so it takes more force to get an object moving than it does to keep it moving.
Explanation:
We can eliminate choice A if we know that both static friction and kinetic friction depend on what are called the coefficients of static friction and kinetic friction, respectively. These coefficients are a reflection of the nature of the surface. In other words, both static friction and kinetic friction depend on the surface material (choice A is incorrect).
Choice B is incorrect because static friction applies to still (static) object whereas kinetic friction applies to moving objects (that have kinetic energy).
Choice C is also incorrect.
Choice D is correct as described in the given information. It takes much more force to start an object from rest than to keep it moving. Think about things in your everyday life - it takes a push to get a toy car moving along the ground, but you do not need to consistently push the car with the same force to keep it moving. This reflects that static friction is much stronger than kinetic friction, which is also described by the relationship between their coefficients (the coefficient of static friction is generally greater than that of kinetic friction).
Hope this helps!
A body is thrown vertically upward with velocity 20m/s .How long time it remains in air? (g=10m/s2)
Answer:
[tex]\boxed{\sf Time \ being \ in \ which \ body \ remains \ in \ air = 4 \ s}[/tex]
Given:
Velocity (u) = 20 m/s
Acceleration due to gravity (g) = 10 [tex]\sf m/s^2[/tex]
To Find:
Time (t) being in which body remains in air.
Explanation:
Formula:
[tex]\boxed{\bold{\sf t=\frac{2u}{g}}}[/tex]
Substituting values of u & g in the equation:
[tex]\sf \implies t = \frac{2 \times 20}{10}[/tex]
[tex]\sf \implies t =\frac{40}{10}[/tex]
[tex]\sf \implies t =\frac{4 \times \cancel{10}}{ \cancel{10}}[/tex]
[tex]\sf \implies t = 4 \ s[/tex]
[tex]\therefore[/tex]
Time (t) being in which body remains in air = 4 seconds
The Big Bang is considered a scientific theory. Why is this true?
A It explains natural phenomena and is based on scientific evidence.
B The scientist Edwin Hubble thought of it.
C It explain the origins of the universe.
D It cannot be disproven.
Answer:
Explanation:In the natural sciences we make observations and construct models.
If those models are consistent with our observations then we can make predictions from those models and test them against more observations.
If some observations contradict our models, then we can tell that our models are wrong or in need of modification.
For example, Newton's laws of physics provide pretty good models sufficient in accuracy to allow us to calculate how to land a man on the moon. Are they therefore true? Not exactly. Newton's laws fail to work well at velocities approaching the speed of light. So we can tell that they need some adjustment.
Einstein's special and general theory of relativity provide more accurate models. So are they true? They predict all sorts of strange behaviour which we have actually observed. They seem to provide useful models, but they do not explain everything. For example, the extreme conditions in a black hole or those we think existed at the start of the universe provide some challenges to General Relativity.
From a practical perspective it is useful to operate within theoretical frameworks that we treat as facts. We need to make assumptions in order to reach substantial conclusions. So we often act as if something like Big Bang theory is a fact, but we cannot know it to be so.
Essentially in any natural science we cannot prove anything to be true. We can demonstrate that theories are false. This is the honesty of science.
Consider an alternative theory: The universe and everything you "know" actually started
10
minutes ago.
You may protest that you remember what you did yesterday. In my theory I can explain that these are simply implanted memories, not real. What about radiometric dating? What about the Andromedra galaxy being
2.5
million light years away, so the light we see from it started travelling in our direction
2.5
million years ago? In my theory I can claim that these are all an elaborate implanted fiction.
There is no way to prove that this theory is true and probably no way to prove that it is false.
A rabbit hops through a vegetable garden. He first hops 2 m south, then 4 m west, then 3 m south, and finally 1 m east. What distance did the rabbit travel? What is his displacement?
Answer:
Distance = 10m
Imagine a triangle
Length = 4 - 1 = 3
Height = 2 + 2 =4
Hypothenuse = Displacement
Displacement = 5
Calculate the force needed to move a 2kg mass with an acceleration of 5ms-2
Answer:
[tex]\Huge \boxed{\mathrm{10 \ N}}[/tex]
Explanation:
[tex]\sf Force \ (N)=mass \ (kg) \cdot acceleration \ (ms^{-2})[/tex]
[tex]F=ma[/tex]
The mass is 2 kg.
The acceleration is 5 ms⁻².
[tex]F = 2 \cdot 5[/tex]
[tex]F=10[/tex]
The force is 10 N.
Convert 6.7 centimeters to meters
Answer:
0.067 meters
Explanation:
[tex]1 \: cm \: \: = 0.01 \:meters \\6.7 \:cm = x \:meters\\\\x = 0.067 \:meters[/tex]
An object's gravitational potential energy is directly related to its
I don't know
Mass
Speed
Velocity
Shape
Answer:
VELOCITY
Explanation:
Since the gravitational potential energy of an object is directly proportional to its VELOCTY above the zero position, a doubling of the velocity will result in a doubling of the gravitational potential energy.
When evaluating data, why is it better to make a graph instead of just looking at the raw data in the table?(8th grade Science since there is no regular science option i'm just gonna put physics)
Answer:All professors planned and thought about data before graph construction. When reflecting on their graphs, professors and graduate students focused on the ... feel more inclusive in the learning process and gain better science process skills, ... We organized data in a table instead of a paragraph with numbers
Explanation:
hope that helps
What problem do you think you can solve around your home using the engineering process?
Answer: Look for something that is not working as well as it should, or is inconvenient.
Explanation: Ask youself (or other s) how it could be improved. Imagine a way to make it better. Draw a design, or make a model or experiment to see if the change you propose will work. You could do research for examples of similar situations to see what others have tried.
You could invent an entirely new solution!
How much force does a soccer goalie
experience when stopping a ball with the
mass of 0.2 kg that accelerates at the rate
of 10 meters per second^2?
Answer:
2 N
Explanation:
From the question, it's given that
Mass m = 0.2 kg
Acceleration a = 10 m/s^2
The force a soccer goalie experience when stopping a ball will be equal to the force at which the ball is being kicked. This is
F = ma
Substitute all the parameters into the formula
F = 0.2 × 10
F = 2 Newton.
A 32-cm-tall, 6.0-cm-diameter cylindrical beaker is filled to its brim with water. Part A What is the downward force of the water on the bottom of the beaker
Answer:8.86 N
Explanation:
Volume of water in cylinder is V= ((3.14*0.06)/4)*0.32=0.0009047
Mass of water is = 0.0009047*998=0.903
Force applied by water is 0.903*9.83=8.86N
a car travels 480 km in 12 hr. what is its velocity
Answer:
Explanation:
velocity=s/t
given distance is 480 km we have to convert it into meter because the unit of distance is meter
1 km=1000 m
480 km=480000 m =4.8*10^5
1 hour= 3600 s
12 hour =43200 s
now velocity=s/t
v=4.8*10^5/43200
v=11.11 m/s
Answer:
The correct answer is 40
Explanation:
Divide 480 and 12 that = 40v
Hoped I helped
Is velocity more like distance or displacement? Why?
Answer:
Displacement
Explanation:
Velocity is more like displacement because
Both are vector quantities. Which means Magnitude+direction.Both have an arrow above their signs which indicates they are vectors.
Hope this helps ;) ❤❤❤
convert 12cm to picometers
Answer:
1.2e+11
Explanation:
120,000,000,000 picometers
Explanation:
A particle makes 240 revolution per minute on a circular radius of 2m find: (1) it's period (2) it's angular velocity (3) it's linear velocity (4) it's acceleration
Answer:
(1) The period 0.25 secs
(2) The angular velocity is 25.14 rad/s
(3) The linear velocity is 50.28 m/s
(4) The acceleration is [tex]1264 m/s^{2}[/tex]
Explanation:
(1) Period is defined as the time taken for one revolution
∴ [tex]Period = \frac{Time }{Number of revolutions }[/tex]
From the question, the particle makes 240 revolution per minute
That is, For 240 revolution, the time taken = 1 minute
Time = 1 minute = 60 secs
Number of revolutions = 240
∴ [tex]Period =\frac{60}{240} \\[/tex]
Period = 0.25 secs
The period 0.25 secs
(2) The angular velocity, ω is given by
ω [tex]= \frac{2\pi }{T} \\[/tex]
where [tex]T[/tex] is the period
∴ω = 2 ×[tex]\frac{22}{7}[/tex] / 0.25 (take [tex]\pi = \frac{22}{7}[/tex])
ω = 25.14 rad/s
The angular velocity is 25.14 rad/s
(3) The linear velocity, v is given by
v = ωr
Where v is the linear velocity
ω is the angular velocity
and r is the radius
From the question, r = 2m
From v = ωr
∴v = 25.14 × 2
v = 50.28 m/s
The linear velocity is 50.28 m/s
(4) The acceleration is given by
[tex]a =[/tex] ω × v = ω(ωr) =ω²r
∴ [tex]a = 25.14^{2}[/tex] × [tex]2[/tex]
[tex]a = 1264.04 m/s^{2} \\a = 1264 m/s^{2}[/tex]
The acceleration is [tex]1264 m/s^{2}[/tex]
An unknown substance has a mass of 670 kg and a volume of 782 m^3. Will it float in water? (Water has a density of 1,000 kg/m^3.)
Answer:
It will float
Explanation:
its density is lower than density of water
Its density is 670 / 782 = 0.856 kg/m³
A spy is running across the bridge of an aircraft carrier. The spy is moving with a velocity of - 4 m/s relative to the carrier. However, the aircraft carrier is moving with a velocity of 12 m/s. There is a person standing stationary on a beach watching the event. What will be the velocity of the spy according to the person on the beach? 8 m/s 6 m/s -4 m/s -7 m/s
Answer:
The correct option is A
Explanation:
From the question we are told that
The velocity of the spy relative to the carrier is [tex]v_s = -4 \ m/s[/tex]
The velocity of the aircraft carrier is [tex]v_a = 12 \ m/s[/tex]
Generally the velocity of the spy according to the person standing stationary on the beach is mathematically represented as
[tex]v = v_s + v_a[/tex]
[tex]v = -4 + 12[/tex]
[tex]v = 8 \ m/s[/tex]
An object wants to maintain its state of motion because it has mass. True or false
Answer:
True
Explanation:
When no net force is applied to a moving object, it still comes to rest because of its inertia.
It is a true statement that an object wants to maintain its state of motion because it has mass, as per the first law of the motion due to the effect of inertia an object tries to maintain its state of motion whether it would be a state of motion or the state of the rest.
What is Newton's first law?According to Newton's first law, until pushed to alter its condition by the intervention of an external force.
Every object will continue to be at rest or in uniform motion along a single direction.
It is true that an item wants to keep moving because it has mass. According to the first law of motion, this is because of the influence of inertia, which causes an entity to try to keep moving whether it is in movement or at standstill.
Learn more about Newton's first law from here,
brainly.com/question/1222214
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Which statement explains the flow of heat? Heat moves from one place to another like a radiating wave. Heat moves as packets of energy are transferred from one substance to another. Heat moves as molecules of one substance collide with molecules of another substance, transferring kinetic energy.
Answer:
C. Heat moves as molecules of one substance collide with molecules of another substance, transferring kinetic energy.
Explanation:
I tried it and got it right.
If there are 7 positive charges, then how many negative charges would be needed to reach a neutral charge?
calculate the amount of charge that would flow in 1 hour through the element of an electric iron draws a current of 0.4 amps
Answer:
The answer is
Q=It.
=60×0.4=24C
In 1935, a French destroyer, La Terrible, attained one of the fastest speeds for any standard warship. Suppose it took 3.0 min at a constant acceleration of 0.50 m/s2 for the ship to reach its top speed after starting from rest. Calculate the ship's final speed.
Answer:
Explanation:
From newton's equation of motion of uniform acceleration
v = u + at
where v is final velocity , u is initial velocity , a is acceleration and time is t .
putting the values
v = 0 + .5 x 3 x 60 ( time in second = 3 x 60 s )
= 90 m /s
So , final velocity is 90 m /s .
WHAT ARE 5 EXAMPLES of REAL science
Answer:
physics
kinematics
dynamics
fluid mechanisms
earth sciences
Talia is in a road trip with some friends. I. The frist 2 hours they travel 100 miles then they hit traffic and go only 30 miles in the next hour the last out of the round trip they drive 75 miles calculate the evergreen speed of the car
Correct question is;
Talia is on a road trip with some friends. in the first 2 hours, they travel 100 miles. then they hit traffic and go only 30 miles in the next hour. the last hour of their trip, they drive 75 miles. calculate the average speed of talia’s car during the trip. give your answer to the nearest whole number.
Answer:
Average speed ≈ 51 mi/hr
Explanation:
Total distance travelled by Talia = 100 + 30 + 75 = 205 miles
Total time taken by Talia = 2 + 1 + 1 = 4 hours.
Now, formula for average speed is;
Average speed = Total distance/total time
Thus;
Average speed of talia = 205/4
Average speed of talia ≈ 51 mi/hr