Answer:
The answer is below
Explanation:
The maximum height (h) of a projectile with an initial velocity of u, acceleration due to gravity g and at an angle θ with the horizontal is given as:
[tex]h=\frac{u^2sin^2\theta}{2g}[/tex]
Given that the two projectile has the same height.
[tex]For\ the\ first\ projectile\ with\ an\ angle\ \60^0 \ with\ the\ horizontal\ and initial\ velocity\ u_1:\\\\h=\frac{u_1^2sin^260}{2g} =\frac{0.75u_1^2}{2g} \\\\For\ the\ second\ projectile\ with\ an\ angle\ \30 \ with\ the\ horizontal\ and initial\ velocity\ u_2:\\\\h=\frac{u_2^2sin^230}{2g} =\frac{0.25u_2^2}{2g}\\\\\frac{0.25u_2^2}{2g}=\frac{0.75u_1^2}{2g}\\\\0.25u_2^2=0.75u_1^2\\\\\frac{u_1^2}{u_2^2} =\frac{0.25}{0.75} \\\\\frac{u_1^2}{u_2^2}=\frac{1}{3} \\[/tex][tex]\\\frac{u_1}{u_2}=\sqrt\frac{1}{3}[/tex]
According to the law of conservation of energy, mechanical energy can be changed to heat energy.
Answer:
The answer to this question is given below in this explanation section.
Explanation:
" law of conservation of energy"
The law of conservation of energy states that energy can neither be created nor destroyed only converted from one form of energy into another.This mean that a system always has a same account of a energy,unless it is added from the outside.This is particularly confusing in the case of non conversation forces,where energy is converted from ,mechanical energy into thermal energy.but the overall energy does remain the same.The only way to use energy is to transform energy from one form to another.
The amount of energy in any system than it is determined by the following equation.
Ut=Ui +W+Q
Ut is the total internal energy of a system.Ui is the initial internal energy of a system.W is the work done by or on the system.Q is the heat added to or removed by the system.It is also possible to determined the change in internal energy of the system using the equation.
ΔU=W+Q
The mechanical energy of a system increases provided their is no loss of energy due to friction.The energy would transform to kinetic energy when the speed is increasing.Te mechanical energy of a system remain constant provided their is no loss of energy due to friction.
The law of conversation of energy which say that in a closed system total energy is conserved that is it constant.
KE1 + PE1=KE2+PE2
Which question characterizes relative motion problems that involve motor boats? a. If the width of the river is X meters wide, then how much time does it take the boat to travel shore to shore? c. Both a and b. b. What distance downstream does the boat reach the opposite shore? d. None of the above.
Answer:
that the correct one is C
Explanation:
In relative motion problems, in this case the boat and the river, with respect to the land and between them, the most common questions are:
* What is the time to cross the river
* How far down does the boat go
* What direction the boat must have to reach the opposite shore
examining the answers we see that the correct one is C
What is the acceleration due to gravity near the earth’s surface?
Its value is 9.8 m/s2 on Earth. That is to say, the acceleration of gravity on the surface of the earth at sea level is 9.8 m/s2
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What is transmitted by EM waves?
a. charges
b. energy
c. fields
d. matter
Answer:
What is transmitted by EM waves?
energy
What is the relationship between the frequency of light and refraction?
Answer:
The refractive index of a medium is dependent (to some extent) upon the frequency of light passing through, with the highest frequencies having the highest values of n. It also changes the wave speed, frequency, and wavelength.. Although the wave slows down, its frequency remains the same, due to the fact that its wavelength is shorter. When waves travel from one medium to another the frequency never changes. As waves travel into the denser medium, they slow down and wavelength decreases
Explanation:
Answer:the higher the frequency the greater the index of refraction
Explanation:The index of refraction of any material besides vacuum varies slightly with the frequency of light too soo basically the more or higher the frequency the greater the refraction (index of refraction)
For example
Say you have green or red light which they have lower frequency that blue or purple
So the index of refraction will be lower
How does the antireflective coating applied to the protective glass on a solar cell maximize the energy absorbed by the solar cell?
A. It helps the glass transmit the energy
B. It helps the glass reflect the energy that hits it
C. It stops the top semiconductor layer from absorbing too much energy
D. It stops the bottom semiconductor layer from absorbing too much energy
Answer:
A
Explanation:
The antireflective coating applied to the protective glass on a solar cell maximize the energy absorbed by the solar cell as it helps the glass transmit the energy. The correct option is A.
The antireflective coating added to the protective glass of a solar cell is intended to reduce light reflection from the glass's surface.
More light may flow through the glass and reach the solar cell underneath it by decreasing reflections. This permits the solar cell to absorb more energy from the sun, increasing its efficiency in converting light into electricity.
The antireflective coating guarantees that a larger proportion of incident light is passed through the glass by decreasing reflection, allowing the solar cell to gather and use more energy.
Thus, the correct option is A.
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What will most likely happen ifa light wave moves through a solid?
O It will increase in wavelength.
O It will decrease in speed.
O It will increase in speed.
O It will decrease in wavelength.
Sam scored 98, 25, 105, 62 and 65 runs in 5 matches. What was the average score per match?
Answer:
71
Explanation:
PLEASE HURRY What is "a section of a chromosome that typically contains the code for a particular protein, which determines a specific trait" called?
heterozygous
genetics
species
gene
Answer:
It is a gene!!
Explanation:
It is because RNA is referred to as a gene. Genes are contained in chromosones.
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
Select the correct answer.
What happens when a negatively charged object A is brought near a neutral object B?
OA. Object B gets a negative charge.
OB. Object B gets a positive charge.
OC. Object B stays neutral but becomes polarized.
OD. Object A gets a positive charge.
O E.Object A loses all its charge.
Answer:
Option C.
Polarization takes place!
Imagine that person B is more massive than person A in the picture above. 3 points
If they push off of each other with the same amount of force, who will
have the greater acceleration? What law are you applying? Explain how
that law is being applied."
Answer:bight
Explanation:
A beaver runs at a speed of 2.0\,\dfrac{\text m}{\text s}2.0 s m 2, point, 0, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction with 45\,\text J45J45, start text, J, end text of kinetic energy.
Answer:
22.5kg
Explanation:
Since we not told wat to find, we can as well find the mass of the beaver.
Kinetic energy formula is expressed as;
KE = 1/2mv²
m is the mass
v is the speed
Given
KE = 45Joules
v = 2.0m/s
Substitute into the formula and get the mass
45 = 1/2m(2)²
45 = 2m
m =45/2
m = 22.5kg
Hence the mass of the beaver is 22.5kg
Why is a protective apron or lab coat important to use when working with acids?
Acids conduct electricity and contact could cause a shock.
Acids react with lipids and can cause damage to skin tissue.
Acids break down fabrics and can cause burns if the acids are strong.
Acids have a slippery feel and could result in a fall.
Answer:
Acids break down fabrics and can cause burns if the acids are strong.
Explanation:
When working with acids, it is advisable for a scientist for wear a protective apron or lab coat because acids break down fabrics and can cause burns.
Acids are chemical substances that produces excess hydroxonium ions in solutions.
Due to their unique properties they are highly corrosive and are used to remove rusts from any surface. We they come in contact with the human body, they can cause severe burns especially if they are very strong acid. If an apron is worn, then the body will be shielded.Answer:
C. Acids break down fabrics and can cause burns if the acids are strong.
Explanation:
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what happens when two forces at same direction
Answer:
Explanation:
· If two forces are in the same direction, then one adds them to find the net force, which is the vector sum of these forces. However, when two forces act in opposite direction, one has to subtract the lesser force from the larger one to find the resulting force. The resultant is the direction of the larger of these two forces.
The image shows a type of fault.
What stress causes this type of fault to form?
A. Compression
B. Gravity
C. Tension
D. Shearing
Answer:
D. Shearing
Explanation:
D. Shearing
The Answer is: Shearing
I need the answer to this question what has the student plotted on the vertical axis?
Answer:
The correct option is D
Explanation:
In trying to achieve what the student wanted to see, which is to see the relationship between the weight the cord can hold and how long the cord will stretch. Since the origin of the graph is from zero, the value plotted on the vertical axis would be just the length caused by each weights. Thus, the original length would have to be subtracted from the measured length to determine the actual length caused by the weight added to the cord.
Which of the following electromagnetic waves has the shortest wavelength?
A. ultraviolet
B. light
С. microwave
D. X-ray
Answer: Not including gamma-rays, x-ray has the shortest wavelength,
How are mass and volume alike?
They always stay the same
They are both measured in grams
The cease to exist when placed in a liquid
Answer:
its b
Explanation:
b
What is meant by a 'closed system'?
Answer:
Image result for What is meant by a 'closed system'?
A closed system is a physical system that does not allow transfer of matter in or out of the system, though, in different contexts, such as physics, chemistry or engineering, the transfer of energy
Explanation:
Answer:
A closed system is a physical system that does not allow transfer of matter in or out of the system, though, in different contexts, such as physics, chemistry or engineering, the transfer of energy is or is not allowed
Explanation:
An electron emitted from a filament is travelling at 1.5 x 105 m/s when it enters an acceleration of an electron gun in a television tube. It is constantly accelerated while travelling 0.01 m, and leaves the gun at 5.4 x 106 m/s. What was the acceleration of the electron
Answer:
The acceleration of the electron is 1.457 x 10¹⁵ m/s².
Explanation:
Given;
initial velocity of the emitted electron, u = 1.5 x 10⁵ m/s
distance traveled by the electron, d = 0.01 m
final velocity of the electron, v = 5.4 x 10⁶ m/s
The acceleration of the electron is calculated as;
v² = u² + 2ad
(5.4 x 10⁶)² = (1.5 x 10⁵)² + (2 x 0.01)a
(2 x 0.01)a = (5.4 x 10⁶)² - (1.5 x 10⁵)²
(2 x 0.01)a = 2.91375 x 10¹³
[tex]a = \frac{2.91375 \ \times \ 10^{13}}{2 \ \times \ 0.01} \\\\a = 1.457 \ \times \ 10^{15} \ m/s^2[/tex]
Therefore, the acceleration of the electron is 1.457 x 10¹⁵ m/s².
A student lifts a basketball to a height of 6 feet and lets the ball drop to the ground. Which statement accurately compares the ball's energy at a height of 6 feet (at rest) and at a height of 2 feet (falling)?
A.
The ball's kinetic energy is the same at both heights, but its potential energy is different.
B.
The ball has less potential energy and more kinetic energy at 6 feet than at 2 feet.
C.
The ball's potential energy is the same at both heights, but its kinetic energy is different.
D.
The ball has more potential energy and less kinetic energy at 6 feet than at 2 feet.
Answer:C
Explanation:
If you are holding the ball that would be the ball would have potential energy since it it not moving. Once you drop the ball it will have kinetic energy since it’s moving. If you drop the ball from 6ft it will have more kinetic since it will have more time to accelerate. If you drop the ball from 2ft then it will have less kinetic energy since it is closer to the ground and won’t have beeping time to accelerate and get rid of the potential energy.
Answer:
c
Explanation:
What is the speed of light? What is the speed of sound?
Answer:
speed of light simulating traveling at the speed of light. Speed of light, speed at which light waves propagate through different materials. In particular, the value for the speed of light in a vacuum is now defined as exactly 299,792,458 metres per second
The speed of sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium
A distance of 0.002 m separates two objects of equal mass. If the gravitational force between them is
0.0104 N, find the mass of each object.
Answer: 24.97 kg
Explanation:
The gravitational force between two objects of masses M1, and M2 respectively, and separated by a distance R, is:
F = G*(M1*M2)/R^2
Where G is the gravitational constant:
G = 6.67*10^-11 m^3/(kg*s^2)
In this case, we know that
R = 0.002m
F = 0.0104 N
and that M1 = M2 = M
And we want to find the value of M, then we can replace those values in the equation to get
0.0104 N = (6.67*10^-11 m^3/(kg*s^2))*(M*M)/(0.002m)^2
(0.0104 N)*(0.002m)^2/(6.67*10^-11 m^3/(kg*s^2)) = M^2
623.69 kg^2 = M^2
√(623.69 kg^2) = M = 24.97 kg
This means that the mass of each object is 24.97 kg
We emphasize performance over participation well before kids' bodies, minds, and interests mature. And we tend to value the child who can help win games or whose families can afford the rising fees." Take some time to think through your answer.
Answer:
Yes.
Explanation:
Yes, we emphasize performance over participation of kids in a competition which causes negative effect on kid's personality. We also prefer those children whose families can afford the fees which is our big failure. We should emphasize participation over performance and prefer those child who has the ability to win the game instead of those who can afford the fees.
Which event in a solar cell uses the photoelectric effect?
A. Electromagnetic waves act according to the wave model of light,
not the particle model.
B. Electromagnetic waves remove electrons from the transparent
glass on the top of the cell.
C. Electromagnetic waves strike a semiconductor, removing some of
its electrons, which form a current.
D. Electrons flow from the negatively charged semiconductor to the
positively charged one.
Answer:C
Explanation: yea
Electromagnetic waves striking a semiconductor, removing some of its electrons, and forming a current is an event in a solar cell which uses
What are electromagnetic waves?
The electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.
The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.
In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.There are 7 types of electromagnetic waves in the electromagnetic spectrum.These have different wavelength, frequency and energy.
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Which of the following is a physical state of matter? *
A mass
B volume
C liquid
n which order did the events forming our solar system occur?
The solar nebula became hot and dense pulling in more gas.This flattened into a rotating disk. It spun faster and faster, forming the Sun.
Gas was pulled toward the center, forming the Sun. Gas flattened into a rotating disk and became hot and dense, forming a solar nebula that spun faster and faster.
Gas flattened into a rotating disk and became hot and dense, forming a solar nebula that spun faster and faster. Gas was pulled toward the center, forming the Sun.
The solar nebula spun faster and faster and flattened into a rotating disk. Most of the gas was pulled toward the center, where it became hot and dense, forming the Sun.
Answer:
The solar nebula became hot and dense because of that it pulling in more gas. This flattened into a rotating disk. It spun faster and faster, forming the Sun.
Explanation:
hope this helps
The solar nebula became hot and dense because of that it pulling in more gas. This flattened into a rotating disk. It spun faster and faster, forming the Sun. This order did the events forming our solar system occur.
What is Solar nebula ?In the so-called nebular hypothesis of the genesis of the solar system, the Sun and planets originated by condensation from a gaseous cloud. In 1734, Swedish philosopher Emanuel Swedenborg claimed that the planets arose from a nebular crust that enveloped the Sun before breaking apart. Immanuel Kant, a German philosopher, proposed in 1755 that the Sun and planets were created by a slow rotating nebula that was eventually pushed together by its own gravitational force and flattened into a spinning disc. In 1796, the French astronomer and mathematician Pierre-Simon Laplace presented a similar concept, but with the planets forming before the Sun. The Kant-Laplace theories were criticised by the British physicist James Clerk in the late nineteenth century.
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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]
how can you change the amplitude of a wave?
Answer:
"Changing the amplitude of a signal is straightforward: We just need to multiply each sample with some constant number. In the case of sine waves, if what we want is a wave with amplitude a, our wave function becomes y = a * Math.sin(x)."
Explanation:
Risk*