Answer:
I think ur wrong to say force doesn't change an object velocity
Explanation:
Force affects how objects move. They change the direction of motion of an object that is already moving. Since force causes a change in the speed or direction of an object, we may say that force causes changes in an object velocity.
why does the fire snake weight less than it was when it was on fire
Answer:
When Zoe weighs the ingredients (sugar and baking soda), it weighs 25 grams in total. When she weighs the “snake” it weighs 23 grams. This is because some carbon dioxide gas produced during the chemical reaction escapes into the air.
25 POINTS!!!
Copy this concept map, and then use vocabulary terms from the previous page to complete the concept map.
VOCAB
Mechanical wave
Electromagnetic wave
Transverse wave
Longitudinal wave
Frequency
Amplitude
Refraction
Radio wave
Infrared wave
Ultraviolet wave
Transparent
Translucent
Opaque
Intensity
Compression
Rarefaction
Pitch
Decibel
Between ball B and ball C, ball ____ has LESS potential energy because ___
a: c;its mass is greater
b: b;its mass is smaller
c: c; its mass is smaller
d: b;its mass is greater
Answer: b
Explanation:
Ec= (1/2)m × v^2
By the formula, you can see that the bigger the mass, the bigger the Cinetic Energy.
b: b; its mass is smaller
Between ball B and ball C, ball B has LESS potential energy because its mass is smaller.
A potential energy, stored energy that depends upon the relative position of various parts of a system. A spring has more potential energy when it is compressed or stretched.
Potential energy is given by formula.
[tex]P.E= m*g*h[/tex]
Since, P.E is directly proportional to mass. Thus, the ball having smaller mass will have the less P.E.
Thus, option b is correct.
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Question 3 of 10
Which law is stated below?
The acceleration of an object is proportional to the force applied to it and
inversely proportional to its mass.
A. The law of inertia
B. Newton's first law
C. Newton's third law
D. Newton's second law
Answer:
D. Newton's second law
Explanation:
Newton's second law of motion states that force of an object is a product of its mass and its acceleration.
Mathematically, F= ma where m is mass and a is acceleration
So from the statement above : The acceleration of an object is proportional to the force applied to it and inversely proportional to its mass , it can be seen from the formula variation as;
F= ma -----making a the subject of the formula
a= F/ m
a= 1/m * F --------- a is inversely related to m as you can see from 1/m but directly related to F hence;
Increase in mass with the same force applied causes the body to accelerate slower where as when force increases, the body accelerates faster.
Which formula is used to calculate the mass of an object if the force and acceleration are known?
Answer:
m=F/a so the second one
force÷ by acceleration
help with this please
Answer:
c
Explanation:
because because because
Answer:
b i believe
Explanation:
Glider A of mass 0.355 kg moves along a frictionless air track with a velocity of 0.095 m/s. It collides with glider B of mass 0.710 kg moving in the same direction at a speed of 0.045 m/s. After the collision, glider A continues in the same direction with a velocity of 0.035 m/s. What is the velocity of glider B after the collision?
Answer:
vB' = 0.075[m/s]
Explanation:
We can solve this problem using the principle of linear momentum conservation, which tells us that momentum is preserved before and after the collision.
Now we have to come up with an equation that involves both bodies, before and after the collision. To the left of the equal sign are taken the bodies before the collision and to the right after the collision.
[tex](m_{A}*v_{A})+(m_{B}*v_{B})=(m_{A}*v_{A'})+(m_{B}*v_{B'})[/tex]
where:
mA = 0.355 [kg]
vA = 0.095 [m/s] before the collision
mB = 0.710 [kg]
vB = 0.045 [m/s] before the collision
vA' = 0.035 [m/s] after the collision
vB' [m/s] after the collison.
The signs in the equation remain positive since before and after the collision, both bodies continue to move in the same direction.
[tex](0.355*0.095)+(0.710*0.045)=(0.355*0.035)+(0.710*v_{B'})\\v_{B'}=0.075[m/s][/tex]
Which of the following statements best describes the relationship between the environment and the collective health of the world? A. The environment does not affect our health. B. When the environment is damaged, our health improves. C. What is good for the environment is good for our health. D. Our collective health is not related to the health of the environment. Please select the best answer from the choices provided. A B C D Mark this and return
Answer:
its C
Explanation:
The statement that describes the relationship between the environment and the collective health of the world is; "what is good for the environment is good for our health."
Humans must maintain a very good interaction with their environment because the interaction between man and his environment is very necessary for healthy living.
Man depends on water, air etc to sustain life. These are part of the natural environment, when these are polluted due to neglect of the environment, human health is adversely affected.
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is cereal a soup? explain why or why not
Answer:
no
Explanation:
because its cold
soup is hot
in physics, the use of force to move an object is called
Answer:
In physics, work means the use of force to move an object. ... Not all force that is used to move an object does work. For work to be done, the force must be applied in the same direction that the object moves
The use of force to move an object is called Work.
A force can change the motion of an object. A force causes an object with mass to change its velocity (acceleration).
[tex]\bold{Force = Mass\times acceleration}[/tex]
while work is the result of the action when a force causes an object to move in the direction of the force.
[tex]\bold{Work= Force\times Displacement}[/tex]
Therefore, the use of force to move an object is called Work.
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A sailboat sits tied up at the dock.
Which forces are acting on it?
(A)
applied force and tension force
(B)
electrical force and applied force
(C)
gravity and electrical force
(D)
tension force and gravity
Answer:B
Explanation:i think so im not suree
A sailboat that is tied up at the dock will experience tension force and gravity. Therefore, option (D) is correct.
What is the tension force?Tension can be described as a force acting along the flexible length of a medium such as a rope, string, or cable, or a force carried by a flexible medium.
Tension can be defined as an action-reaction pair acting at each end of the elements. For a rope, tension is present in every section of the rope or string in both directions, apart from their endpoints. Each endpoint of the rope will experience tension and force from the weight attached to it.
Tension can also be defined as a pulling force but the tension is not a pushing force. Ropes or strings are used to exert forces since they transfer a force over a specific distance.
Therefore, sailboats experience the tension force due to the rope with which it is tied at the dock and the force due to gravity.
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Why aren’t all the islands of Hawaii the same age?
Answer:
The age trend of the volcanoes is thought to be due to the way in which the islands are built on the moving sea floor of the North Pacific Ocean: the Pacific Ocean is mostly floored by a single tectonic plate (known as the "Pacific Plate") that is moving over the layer in the Earth known as the Asthenosphere
Explanation:
An object completes 10 cycles in 50s.
a. What is the period of its rotation?
b. What is the frequency of its rotation?
Answer:
.
Explanation:
Explanation:
Given parameters:
Number of cycles = 10cycles
Time taken = 50s
Unknown:
Period of its rotation = ?
Frequency of its rotation = ?
Solution:
The period of rotation is the time taken time taken for a body to complete a number of rotation;
Period = [tex]\frac{t}{n}[/tex]
t is the time
n is the number of cycles
Period = [tex]\frac{50}{10}[/tex] = 5s
The period is 5s
Now, frequency is the inverse of period;
F = [tex]\frac{1}{period}[/tex] = [tex]\frac{1}{5}[/tex] = 0.2Hz
30 Joules of energy enter a light bulb. 20 joules of energy are transformed into light; how much energy is dissipated as heat?
where should i graph the distance in a distance time graph
Answer:
Distance in Y axis and Time in axis
Answer:
the distance should be on the Y axis (vertical) and the time should be on the X axis (horizantial)
a camel can walk easily on sandy desert but a horse cannot, why?
plz anyone tell
Answer:
I believe the camels hooves or whatever are built diffrenet.
Explanation:
What type of interference is happening when light waves add together to
become brighter?
Which letter on the diagram shows this phenomenon?
Answer:
They become brighter in constructive interference because the wave paths donot cancel out, but just strengthen to give a brighter light.
No diagram
7. Two people are pushing a 40.0kg table across the floor. Person 1 pushes with a force of 490N
[W], and person 2 pushes with a force of 565N (N). If the coefficient of kinetic friction between
the table and the floor is 0.613, determine the acceleration of the table.(12.7m/s2 [49.1° Nofw])
Answer:
20.4 [tex]m/s^{2}[/tex]
Explanation:
To start doing this problem, first draw a free body diagram of the table. My teacher always tells us to do this, and I find that it is very helpful. I have attached a free body diagram to this answer- take a look at it.
First, let us see if Net force = MA. To do that, we need to determine whether the object is at equilibrium horizontally. For an object to be at equilibrium, it either needs to be moving at a constant velocity or not moving at all. Also, if an object is at equilibrium, there will not be any acceleration. But we know that there IS acceleration horizontally, so it cannot be in equilibrium. If it is not in equilibrium, we can use the formula ∑F= ma.
Let us determine the net force. Since the object is moving horizontally, we can ignore the weight and normal force, because they are vertical forces. The only horizontal forces we need to worry about are the applied force and force of friction.
Applied force = 1055 N (490 + 565)
Friction force= Unknown
To find the friction force, use the kinetic friction formula, Friction = μkN
μk is the coefficient, which the problem includes- it is 0.613.
N is the normal force, which we have to find.
*To find the normal force, we have to determine if the object is at equilibrium VERTICALLY. Since it has no acceleration vertically (it's not moving up/down), it is at equilibrium. Now, when an object is at equilibrium in one direction, it means that all the forces in that direction are equal. What are our vertical forces? Weight (mg) and Normal force (N). So it means that the Normal force is equal to the Weight.
Weight = mg = (40)(9.8) = 392 N
Normal force = 392 N
Now, plug it back into the formula (μkN): (0.613)(392) = 240.296 N
Friction = 240.296 N
Now that we know the friction, we can find the horizontal net force. Just subtract the friction force, 240.296 from the applied force, 1055 N
Horizontal Net Force: 814.704 N
Now that we know the net force, plug in the numbers for the formula
∑F= ma.
814.704 = (40.0)(a)
*Divide on both sides)
a = 20.3676 m/s^2
Round it to 3 significant figures, to get:
20.4 [tex]m/s^{2}[/tex]
A ‘thermal tap’ used in a certain apparatus consists of a silica rod which
fits tightly inside an aluminium tube whose internal diameter is 8mm at
0
0C. When the temperature is raised, the fit is no longer exact. Calculate
what change in temperature is necessary to produce a channel whose
cross-section is equal to that of a tube of 1mm internal diameter. (linear
expansivity of silica = 8X10-6
/K and linear expansivity of aluminium =
26X10-6
/K )
Correct question is;
A thermal tap used in a certain apparatus consists of a silica rod which fits tightly inside an aluminium tube whose internal diameter is 8mm at 0°C.When the temperature is raised ,the fits is no longer exact. Calculate what change in temperature is necessary to produce a channel whose cross-sectional is equal to that of the tube of 1mm. (linear expansivity of silica = 8 × 10^(-6) /K and linear expansivity of aluminium = 26 × 10^(-6) /K).
Answer:
ΔT = 268.67K
Explanation:
We are given;
d1 = 8mm
d2 = 1mm
At standard temperature and pressure conditions, the temperature is 273K.
Thus; Initial temperature; T1 = 273K,
Using the combined gas law, we have;
P1×V1/T1 = P2×V2/T2
The pressure is constant and so P1 = P2. They will cancel out in the combined gas law to give:
V1/T1 = V2/T2
Now, volume of the tube is given by the formula;V = Area × height = Ah
Thus;
V1 = (πd1²/4)h
V2 = (π(d2)²/4)h
Thus;
(πd1²/4)h/T1 = (π(d2)²/4)h/T2
π, h and 4 will cancel out to give;
d1²/T1 = (d2)²/T2
T2 = ((d2)² × T1)/d1²
T2 = (1² × T1)/8²
T2 = 273/64
T2 = 4.23K
Therefore, Change in temperature is; ΔT = T2 - T1
ΔT = 273 - 4.23
ΔT = 268.67K
Thus, the temperature decreased to 268.67K
You look at yourself in the mirror and notice many of your physical features: your hair color, eye color, your height, dimples, etc. How does DNA relate to the way you look the way you do?
well, you get some DNA from both of your parents, so when you hear the phrase, "You have your mother's eyes!" That means you have some of your mother's DNA that gave you her eye color. The DNA you get from your parents help determine how you look today
A sound wave traveling through dry air has a frequency of 16 Hz, a
wavelength of 22 m, and a speed of 350 m/s. When the sound wave passes
through a cloud of methane, its wavelength changes to 28 m, while its
frequency remains the same. What is its new speed? (The equation for the
speed of a wave is v= f x.)
A. 350 m/s
B. 9,800 m/s
C. 450 m/s
D. 13 m/s
Answer:
C. 450
it should be right
The new speed of sound wave is 450 m/s. Hence, option (C) is correct.
What is sound wave?A sound wave is the pattern of disruption brought on by the movement of energy moving through a medium as it propagates away from the source of the sound (such as air, water, or any other liquid or solid matter).
Pressure waves are produced when an object vibrates, such as a ringing phone, and these waves are known as sound waves.
Frequency of sound wave is = 16 Hz.
Wavelength of the sound wave is = 28 m.
Hence, new speed of sound wave is = 16 × 28 meter/second
= 448 meter/second
=450 meter/second. (approx.)
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12. What is the photoelectric effect, and what experimental evidence led scientists
to discover it? Does this support the wave or particle theory of light? Why?
Answer:
Photoelectric effect, phenomenon in which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation.
Explanation:
The effect is often defined as the ejection of electrons from a metal plate when light falls on it. In a broader definition, the radiant energy may be infrared, visible, or ultraviolet light, X-rays, or gamma rays; the material may be a solid, liquid, or gas; and the released particles may be ions (electrically charged atoms or molecules) as well as electrons. The phenomenon was fundamentally significant in the development of modern physics because of the puzzling questions it raised about the nature of light—particle versus wavelike behaviour—that were finally resolved by Albert Einstein in 1905. The effect remains important for research in areas from materials science to astrophysics, as well as forming the basis for a variety of useful devices.
The emission of electrons from the surface of a metal by the action of light is called photoelectric effect. This phenomenon indicates the behavior of light as particles called photons.
What is photoelectric effect ?The phenomenon of ejection of electrons from the surface of a metal when light of a suitable frequency falls on it is called photoelectric effect. Upon striking the surface of metals , light can set up an electric current which current which corresponds to the flow of electrons. This phenomenon is discovered by Einstein
For instance, visible light can cause ejection of electrons from the surface of metal like cesium which has low ionization enthalpy. This phenomenon is related to the observation that if light is considered as particles.
The particles of light is then called as photoelectrons or photons. Photoelectric effect find application in photoelectric cells used in colorimetry, spectrophotometers etc.
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5. Annie drags her little red wagon with a mass of 5.00 kg, up a hill that has an angle of
elevation of 30.09. She applies the force of 150 N parallel to the incline. Assume that
the wagon starts from rest at the bottom of the hill, and neglect friction (4 points)
a) What is the value of the acceleration of the wagon?
Answer: [tex]25.08\ m/s^2[/tex]
Explanation:
Given
mass of wagon m=5 kg
elevation
[tex]\theta =30.9^{\circ}\\F=150\ N[/tex]
Sin component of weight will oppose the applied force therefore we can write
[tex]F-W\sin \theta=ma\\where\\W=weight(mg)\\a=acceleration[/tex]
[tex]150-5\times 9.8\times \sin (30.09)^{\circ}=5\times a\\125.43=5a\\a=25.08\ m/s^2[/tex]
this is the last question
Answer:
It's C
Explanation:
Which circuit shows three resistors connected in series?
The circuit shows three resistors connected in series is the letter B because he elements are connected on the same wire and there is only one path for the electric current to flow.
What is the difference between series and parallel circuit?The main difference between series and parallel circuit is the way voltage and current are presented. The voltage will be the same at all points in the parallel circuit and the current will vary. In series circuit, it is the voltage that can be different, while the electric current is the same.
In a series electric circuit, the elements are connected on the same wire and there is only one path for the electric current to flow. For this reason, the electric current is the same in all elements of the circuit.
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Pls Solve this!!!Im giving 20 points and Brainliest to the one who answers first. HELP ME PLEASE!!!!!!!!
Answer:
i) 2Mg + O₂ + Δ Heat → 2MgO + Δ Energy
ii) The aqueous solution does not change in the color of the blue litmus paper and the blue litmus paper remains blue in color
The aqueous solution formed using the product (MgO) turns the red litmus paper blue
Explanation:
i) Magnesium easily burns in air or oxygen when heated to form a white powder of magnesium oxide. The burning (reaction) of magnesium in air is an exothermic reaction that involves the release of heat and light
The burning of magnesium wire is given by the following chemical reaction;
2Mg + O₂ + Δ Heat → 2MgO + Δ Energy
ii) When magnesium oxide is mixed with water if forms magnesium hydroxide Mg(OH)₂ as shown in the following chemical reaction;
MgO + H₂O → Mg(OH)₂
Magnesium hydroxide is basic and therefore it will turn red litmus paper blue and it does not change the color of the blue litmus paper.
After completing an experiment, all chemical wastes should be
Answer:
The correct answer is
C. disposed of according to your instructor’s directions
Explanation:
The question is not complete here is the complete one with options to choose from
After completing an experiment, all chemical wastes should be
A. taken home
B. dumped in the sink
C. disposed of according to your instructor’s directions
D. left at your lab station for the next class
Which vector below goes from (0,0) to (-2,4)?
A. c
B. a
C. b
D. d
Answer:
I believe it is A.c
Explanation:
hope its right
Answer:
the correct answer is A with a line on top
Explanation:
I just did the quiz
Increase or decrease? 35 points ??? Please help
Answer:
increase, GPE, KE, KE, KE, PE, PE, KE, KE,
Explanation:
The shortstop plays between first and second base.
true or false
SINGLE TO RIGHT OR CENTER FIELD-On a single to center or right field the first baseman will be the cutoff to home. The shortstop will cover second base.
