grrr i don't have much time, help please T^T
will give brainlist and points! I'LL OWE YOU FOREVER
Answers
Answer:
2. ( b ) zero
3. ( c ) 10 s
4. Uniform then decreasing
Explanation:
2.
Since the motion is uniform, initial and final velocity will be 0, hence acceleration will be zero.
3.
Initial velocity ( u ) = 5 m/s
Final velocity ( v ) = 35 m/s
Acceleration ( a ) 3 m/s^2
To find : Time ( t )
Formula : -
t = v - u / a
= 35 - 5 / 3
= 30 / 3
t = 10 s
Answer:
See below ~
Explanation:
Q2
The uniform circular motion in the movement of object in a circular path with fixed and perpendicular on the direction of the motion acceleration.
dQ3
Substitute the values in : v = u + at35 = 5 + 3t3t = 30t = 10s (c)Q4
The vertical component for a projectile by acute angle on the horizontal axis changes from decreasing then increasing velocity.
dRelated Questions
A set of water waves travels at 10.0 m/s , and 5.0 waves pass you in 4.0 s. What is the wavelength of the waves?
Answers
Answer:
8 meters
Explanation:
Frequency of waves = 5 waves / 4 s = 1.25 Hz
speed = frequency * wavelength
speed/ frequency = wavelength
10 / 1.25 = 8 m
A tuning fork consists of two metal prongs that vibrate at a single fre- quency when struck lightly. What will happen if a vibrating tuning fork is placed near another tuning fork of the same frequency
Answers
Resonance would occur when a vibrating tuning fork is placed near another tuning fork of the same frequency.
What is resonance?Resonance can be defined as a phenomenon in which a physical object is forced to vibrate due to the vibration of a second object at the same natural frequency of the first object.
This ultimately implies that, resonance is an increase in the amplitude of oscillation that only occurs when the frequency of a periodically applied force is equal to the natural frequency of a physical object such as a tuning fork, on which it's acting.
In conclusion, we can infer and logically deduce that resonance would occur when a vibrating tuning fork is placed near another tuning fork of the same frequency.
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Whats the difference between a lunar and solar eclipse?.
Answers
Answer: there is no shadow on the Moon with the solar eclipse.
Explanation: When the Moon passes between the Earth and the Sun, it casts a moving shadow on the Earth's surface, known as a solar eclipse. When the Earth passes between the Sun and the Moon, a lunar eclipse occurs, creating a shadow on the Moon.
When an ice pack is applied to an injury, thermal energy from the injured area transfers to the ice, causing the blood
vessels within the area to constrict, which reduces the swelling.
How is thermal energy transferred in this scenario?
a conduction
b convection
c radiation
Answers
Thermal energy from the injured area transfers to the ice and the thermal energy transferred in this scenario is conduction.
What is Heat transfer by conduction?
Conduction heat transfer is the transfer of heat through matter such as solids, liquids, or gases without bulk motion of the matter.
The ice pack absorbs the heat energy without the actual movement of the molecules of the ice pack.
Thus, thermal energy from the injured area transfers to the ice and the thermal energy transferred in this scenario is conduction.
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Answer:
1. What is the best description of thermal energy?
B) Thermal energy is the energy in matter due to the movement of its atoms and/or molecules.
2. An athlete hurts their wrist. They put an ice directly on the wrist. In which direction is the thermal energy moving?
B) The thermal energy is moving from the wrist to the ice pack.
3. What happens when two substances with different temperatures come into contact?
B) Thermal energy is transferred from the warmer substance to the cooler substance.
4. Which is the best description of what happens when thermal energy is removed from a substance?
B) Its particles lose kinetic energy and move more slowly.
5. Which of the following is typically part of the knowledge base of research and development scientists working on heating devices?
A) substances and their properties
Explanation:
i just finished the quick check
A glass prism can be used to show the dispersion of white light to form a spectrum.
a.Draw a diagram to show how a ray of white light is dispersed as it passes through a prism.
b.Which colour of light is most strongly dispersed (deflected) as it passes through the prism?
c.Explain why some colours of light are more strongly dispersed than others.
For each of the following statements, decide whether it is true or false.
Answers
a) For Diagram refer to the attachment.
b) The colour that dispersed most is violet.
c) Every colour has its own wavelengths/ frequency. Different colours move with same speed in air / vaccum. But their speeds in refracting media like glass are different. Therefore, refractive index of the medium for different colours is different. Some gets strongly dispersed due to shorter wavelengths.
Explanation :
Dispersion of Light : The splitting up of a white light into different colours is called Dispersion of light. The light is made up of different colours. Each colour travels at its own speed inside a prism. Due to this different colours of light bend through different angles with respect to the incident ray , as they pass through a prism. The eed light bends the least while the violet the most. Thus, the rays of each colour emerge along different paths and thus becomes distinct.Two charged plates separated by 15 cm create a uniform electric field of 360 n/c. what is the potential difference between the plates?
Answers
When two charged plates are separated by a distance, the potential difference between the plates is 54 Volts.
What is uniform electric field?The electric field intensity which does not increase or decrease with time or remain constant is called the uniform electric field.
Given is the plates separated by distance d = 15 cm =0.15 m, electric field E= 360 N/C.
The relation between the electric field and voltage is
E=V/d
Substitute the values into the expression to get the potential difference V,
V = 360 x 0.15
V = 54 Volts
Thus, the potential difference between the plates is 54 Volts.
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Two coherent sources of light are three
wavelengths out of phase. does light from these
sources experience constructive interference,
destructive interference, or no interference at all?
explain how you know.
Answers
Answer:
The difference phase = 3 λ
In terms of wavelength the difference of phase is zero so the sources would experience "constructive" interphase at that point.
If the light from the sources differed by 1/2, 3/2, 5/2 wavelengths etc, then the sources would be out of phase at that point.
Question 8
If a cheetah can run at a speed of 100 km/h for the initial 500 m of its chase, h
much time would it take to catch its prey that is at a distance of 100 m?
O 1.5 s
O 2.3s
O 3.6s
O 4.8s
Answers
Answer:
3.6 s
Explanation:
100 km/hr =27.77 m/s
100/27.77=3.6 sec
a truck is moving towards east with the velocity of 20 metre per second and another is moving toward the west with the velocity of 15 metre per second calculate the relative velocity If those trucks move at the same time from the same place calculate the distance between them after 2 minutes
Answers
(a) The relative velocity If those trucks move at the same time from the same place is 35 m/s.
(b) The distance between them after 2 minutes is 4,200 m.
Relative velocity of the two trucksThe relative velocity of the two truck is calculated as follows;
Vr = 20 m/s - (-15 m/s)
Vr = 20 m/s + 15 m/s
Vr = 35 m/s
Distance between the object after 2 minsd = Vr(t)
d = 35(2 x 60 s)
d = 4,200 m
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A dolphin leaps out of the water
at 6.25 m/s at a 45.0° angle.
How far away does it land?
(Unit = m)
Answers
x max = (vi² sin 2α) / g
x max = (6.25² sin 90)/10
x max = 39.0625/10 = 3.91 m
In a building, air moves due to currents caused by temperature differences. Which
A. statement best describes these currents?
B. They transfer thermal energy due to radiation.
C. They transfer electrical energy due to convection.
D. They transfer thermal energy due to convection.
Answers
Answer:
D. they transfer thermal energy due to convection
In a building, air moves due to currents caused by temperature differences. They transfer thermal energy due to convection. this statement best describes these currents. Hence option D is correct.
What is Temperature ?Temperature is a physical quantity which measures hotness and coldness of a body. Temperature measures the degree of vibration of molecule in a body. Temperature is measured in centigrade (°C), Fahrenheit (°F) and Kelvin (K) in which Kelvin (K) is a SI unit of temperature. Absolute scale of temperature means Kelvin scale of temperature. relation between Kelvin(K) and centigrade (°C), °C= K - 273.15 from equation, 273.15 K means 0 °C, which is freezing point of water (ice). when we give temperature to the body, its molecule or atom absorbs thermal energy and vibrate about their mean position. Amplitude of vibration get increases as we go on increasing temperature and for higher temperature force of attraction between molecules gets weaker. Hence for higher temperature, due to weaken the force of attraction between molecule, solid goes into liquid state. and further increase in temperature liquid goes into gaseous state.
Hence option D is correct.
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Work is done when:______.a. you apply a force to an object and the object moves in any direction. b. you apply a force to an object and it moves in the same direction.c. you apply a force to an object and it moves in the opposite direction. d. You apply a force to an object and it doesn't move.
Answers
Answer:
b
Explanation:
The formula for work done (W) is:
W = Force x Distance moved in the direction of force
This means that the object needs to move in the direction of the force, otherwise no work is done in that direction.
Hope this helps!
What is the magnitude of the force needed to keep a 60. -newton rubber block moving across level, dry asphalt in a straight line at a constant speed of 2. 0 meters per second?.
Answers
Answer:
A force of μk⋅60N is needed to keep a 60-newton rubber block moving across level, dry asphalt in a straight line at a constant speed.
Explanation:
which of these galaxies would you most likely find at the center of a large cluster of galaxies?
Answers
Answer:
a large elliptical galaxy
Explanation:
How do astronauts counteract the effects of microgravity on their bones while they are in space?.
Answers
Answer:
they use a spaceship plus oxygen space has a gravitational force
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What is Wave Optics?
Thanks (:
Answers
the branch of optics that studies interference, diffraction, polarization, and other phenomena for which the ray approximation of geometric optics is not valid.
What happens when a sound wave passes by the particles of a medium?
Answers
Answer:
Propagation of Sound Waves:
Sound waves move (propagate) through a medium by means of particle-to-particle interaction. The source disturbs the immediately surrounding particles, causing them to vibrate about their fixed position at the same frequency as the source.
Question 21 of 25
If an electromagnetic wave has a frequency of 8 x 1014 Hz, what is its
wavelength? Use a = . The speed of light is 3 x 108 m/s.
?
3 x .
V
f
O A. 2.7 x 10-6 m
O B. 3.8 x 1021 m
O C. 3.8 x 10-7m
O D. 2.7 x 106 m
SUBMIT
Answers
v=c
3x10^8/8x10^14
3.8X10^-7
C
Why do we feel the force of gravity from the Earth but we don’t feel the force of gravity from the moon?
Answers
Answer:
The gravitational force on the moon is less than on Earth because the strength of gravity is determined by an object's mass. The bigger the object, the bigger the gravitational force. Gravity is pretty much everywhere. We just feel it in different ways depending on our state of motion.
Explanation:
Hope this helped!!
:)
If a 40.1 g piece of iron at 652 °C is dropped into a sample of 328 g of water at 32.4 °C, what will the final temperature be after thermal equilibrium is established? Assume that no heat is lost during the process. specific heat capacity of iron is 0.45 J/g C and water is 4.184 J/g C. SHOW YOUR WORK.
Answers
The final temperature of the mixture after thermal equilibrium is reached given the data is 40.4 °C
Data obtained from the questionMass of iron (M) = 40.1 gTemperature of iron (T) = 652 °C Specific heat capacity of iron (C) = 0.45 J/gºCMass of water (Mᵥᵥ) = 328 gTemperature warm water (Tᵥᵥ) = 32.4 °CSpecific heat capacity of the water (Cᵥᵥ) = 4.184 J/gºC Equilibrium temperature (Tₑ) =? How to determine the equilibrium temperatureHeat loss = Heat gain
MC(T – Tₑ) = MᵥᵥCᵥᵥ(Tₑ – Tᵥᵥ)
40.1 × 0.45(652 – Tₑ) = 328 × 4.184(Tₑ – 32.4)
18.045(652 – Tₑ) = 1372.352(Tₑ – 32.5)
Clear bracket
11765.34 – 18.045Tₑ = 1372.352Tₑ – 44464.2048
Collect like terms
11765.34 + 44464.2048 = 1372.352Tₑ + 18.045Tₑ
56229.5448 = 1390.397Tₑ
Divide both side by 1390.397
Tₑ = 56229.5448 / 1390.397
Tₑ = 40.4 °C
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PLEASE HELP
Which of the following is a characteristic property of the alkaline earth
metals?
A. They are harder than alkali metals.
B. They are more reactive than alkali metals.
C. They all have 3 valence electrons.
D. They are all radioactive.
Answers
Answer:
It's D, they're all radioactive. This is due to the molecules that it is made up of
Answer:
the answer is A
Explanation:
I hope it helps you
Which of the following is velocity?
-35.2 m/s
125 m/s East
All of these are examples of velocity.
+95 m
Answers
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
Velocity is defined as total displacement occurrence by the given time interval, and since it's a Vector quantity it has direction as well.
So, the correct choice will be ~ B. 125 m/ East
Because it has unit of Velocity ( that is - m/s ) and it shows direction of displacement ( that is - East )
Warm air is _____ dense than cold air, and warm air holds _____ moisture than cold air.
Answers
Answer:
Warm air is less dense than cold air, and warm air holds more moisture than cold air.
Explanation:
HOPE THIS HELPS AND HAVE A NICE DAY <3
Spaceship I, which contains students taking a physics exam, approaches Earth with a speed of 0.60c, while spaceship II, which contains instructors proctoring the exam, moves at 0.28c (relative to Earth) directly toward the students. If the instructors in spaceship II stop the exam after 50 min have passed on their clock, how long does the exam last as measured by (a) the students (b) An observer on the Earth?
Answers
Answer:
Let β = v / c
proper time Δt' is measured in a frame at the same place in a given frame - the proper time is measured in spaceship II moving at .28 c
a) spaceship I is moving at (.6 - .28) c = .32 c relative to proper time
Δt = Δt' / (1 - β^2)^1/2 as measured by students in ship I
Δt = 50 / (1 - .32^2)^1/2 = 52.8 m measured by students
b) Δt = 50 / (1 - .28^2)^1/2 = 52.1 min time elapsed for observer on earth
What is the world’s biggest source of electricity production?.
Answers
Coal, followed by gas is the largest source of electricity
Coal is the world’s biggest source of electricity production.
The world's biggest source of electricity production is Coal. Coal is a fossil fuel that is mined from the ground and is the largest source of energy for the generation of electricity worldwide. Coal is burned to produce heat, which is then used to boil water and produce steam. The steam drives turbines that generate electricity.
There are other sources of electricity as well, such as natural gas, nuclear energy, hydroelectric power, and renewable energy sources like wind and solar power.
However, coal is the largest source of electricity production in the world.
A cross-country runner runs 4 km in 15 minutes. What can you calculate using this information?
Answers
One can calculate speed from the given data. The speed is 4.44m/s.
What is speed?The speed is the ratio of distance and the time taken to cover that distance.
Given is the distance d =4km =4000m and the time taken t 15 min =15 x60 =900 s
Then the speed will be
s = d/t
s = 4000/900
s= 4.44 m/s
Thus, the speed is calculated as 4.44m/s.
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1 astronomical unit (A) is
Answers
149,597,871 kilometres
hope it helps...!!!
What is the de Broglie wavelength of a 2.89 x 10-28 kg particle moving
at 3.00 x 108 m/s? (h = 6.626 x 10-34 J-s)
Answers
Explanation:
formula is given by
h/mv
where h is 6.626 × 10 ^-34
and c = 3 × 10^8
m = mass
by plugging in the values in the formula, the de Brogile wavelength is equal to 7.6424 × 10^(-15)
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5.
A girl uses a 3.0 m long ramp to push her 110 kg motorbike up to a trailer, the floor of which is 1.2 m above the ground.
How much work is done on the motorbike?
Answers
we can use 3 formula for inclined plane
W=-ΔPE
W=ΔKE
W=mg sinθ. d
let's use the third formula
sinθ = 1.2 : 3
sinθ = = 0.4
W = m.g. sinθ. d
W = 110 x 10 x 0.4 x 3
W = 1320 J
15 PNTS
Select the correct answer. Which of the following is not produced in fission reactions?
A. greenhouse gases
B. heat
C. isotopes
D. neutrons
Answers
Answer:
A. Greenhouse gases
Explanation:
Because nuclear fission involves the modification of atoms.
Answer:
Greenhouse gases, because in nuclear fission, we are talking about modifying strictly atoms to get a reaction, therefore it would not make sense for greenhouse gases to be a reaction.
