Answer:
ANSWER
Initial Velocity (u) = 10 m/sec
Acceleration (a) = 5 m/sec
2
Distance (s) = 30 m
Final velocity (v) = ??
Using Newton's Third law of Motion,
v
2
=u
2
+2as
v
2
=10
2
+2×5×30
v
2
=100+300
v
2
=400
v =
400
v = 20 m/sec
_____________________________
ANSWER =
FINAL VELOCITY = 20 m/sec
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Explanation:
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If you pair copper which has an electron affinity of 0.34 and silver which has an electron affinity of 0.80, will you make a strong battery or a weak one? Explain how the materials affect the function of the battery. (4 points)
What waves have a lot of energy and are potentially harmful
Select the best answer from the choices below. Light has many properties of waves but sometimes it also behaves like: A photon Polarized light ultraviolet rays schem of particles
Answer:
The correct option is;
Stream of particles
Explanation:
Light can be observed to behave as stream of particles in the physical phenomenon of blackbody radiation and photoelectric effect whereby electrons are ejected by the impact of light such that the number of electrons ejected is a function of the amount of photons transmitted which are absorbed by the electrons before they can be ejected
The energy of the photons depends on the frequency of the light source of the photons, while the electrons are ejected when the energy of the photon is up to their threshold value
As such light can also be considered as behaving as a stream of particles called photons.
If the word "kinetic" refers to motion/movement, why is Kinetic Sand called Kinetic sand?
Answer:
Kinetic sand is regular sand that's been coated with silicone oil
Explanation:
hope it helps
A sample of matter experiences a decrease in average kinetic energy as it continues to cool. One would anticipate that the particles will eventually come to a complete stop. The temperature at which particles should theoretically stop moving is absolute zero. Thus, option B is correct.
What theory directly contradicts concept of absolute zero?
All molecules are predicted to have zero kinetic energy and, as a result, no molecular motion at absolute zero (273.15°C). Zero is a hypothetical value (it has never been reached).
Absolute zero signifies that there is no kinetic energy involved in random motion. A substance's atoms don't move relative to one another.
Therefore, Kinetic energy because it can create heat which goes against the absolute zero. A gas molecule's kinetic energy tends to zero when the temperature reaches absolute zero.
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A brick is cut into small pieces. Which physical property do the small pieces have in common with the brick from which they came?
Answer:
Density
Explanation:
Density is defined as the ratio of mass of an object to the volume of object.
The density remains an equivalent because cutting the brick into small pieces will divide the mass & volume by an equivalent amount. This means the density of a object remains an equivalent (or same) regardless of what size shape, length, it is.
Planet X has a mass of M and a radius of R. Planet Y has a mass of 3M and a radius of 3R. Identical satellites orbit both planets at a distance R above their surfaces, as shown above. The planets are separated by such a large distance that the gravitational forces between them are negligible.
How does the magnitude of the gravitational force FY exerted by Planet Y on its satellite compare to the gravitational force FX exerted by Planet X on its satellite?
Answer:
[tex]{FY} = \dfrac{3}{4} \times FX[/tex]
Explanation:
The parameters given for the planets are;
The mass of planet X = M and the radius of planet X = R
The mass of planet Y = 3·M and the radius of planet Y = 3·R
The magnitude of the gravitational force of the planets on their satellites are given by the following equation;
[tex]F=G \times \dfrac{M_{1} \cdot m_{2}}{R^{2}}[/tex]
Where;
M₁ = The mass of the first object = The mass of the planet
m₂ = The mass of the second object = The mass of the satellite
R = The distance between the centers of the two planets = The distance between the center of the planet and the satellite
G = The universal gravitational constant
The force between planet X and the satellite in its orbit = [tex]FX=G \times \dfrac{M \times m}{(2 \cdot R)^{2}} = G \times \dfrac{M \times m}{4 \cdot R^{2}}[/tex]
The force between planet Y and the satellite in its orbit = [tex]FY=G \times \dfrac{3\cdot M \times m}{(4 \cdot R)^{2}} = G \times \dfrac{3\cdot M \times m}{16 \cdot R^{2}} = G \times \dfrac{ 3\cdot M \cdot m}{16 \cdot R^{2}}[/tex]
Therefore;
[tex]\dfrac{FY}{FX} = \dfrac{G \times \dfrac{ 3\cdot M \cdot m}{16 \cdot R^{2}}}{G \times \dfrac{M \times m}{4 \cdot R^{2}}} = \dfrac{3}{16} \times \dfrac{4}{1} = \dfrac{3}{4}[/tex]
[tex]{FY} = \dfrac{3}{4} \times FX[/tex]
do light waves move parallel
Answer: Sound waves are examples. parallel - For the purposes of this Activity Object, parallel is defined as moving in the same direction. Specifically in the case of longitudinal waves, particles move forward and back parallel to the direction of the travelling wave. ... Some examples are ocean waves and light waves.
Explanation:
The needs of society have no effect on technology. true or false
Answer:
False
Explanation:
A lot of inventors worked on inventions due to things that society needed. For example, Alexander Graham Bell created the telephone because we didn't have a stable line of communication back then.
Serafina has finished cleaning and organizing her bedroom and put away the last of her shoe storage containers. She has a lifting force of 25 N and moved the container a distance of 3 meters. How much work did she do? (Make sure you include proper units in your answer.)
Answer: Work DONE =- 75Nm = 75 Joules
Explanation:
Work is done when a force applied to an object, cause a displacement by causing such object to move Thus work is calculated by multiplying the force by the distance moved by the object.
From the question,
Given that force= 25N
Distance = 3m
therefore
Work = Force x Distance
25N X 3m =
= 75 Nm = 75 Joules
Bart carried his skateboard up a hill and then rode the skateboard down the hill. When he reached the bottom of the hill, he rolled to a stop. When did Bart have the most potential energy?
Explanation:
The potential energy of an object is given by :
P = mgh
Where,
m is mass, g acceleration due to gravity and h is the height reached by the object.
The potential energy of an object is directly proportional to the height of the object. It means that when the skateboard reaches at the maximum height, it has highest potential energy.
the picture below shows a centrifuge used to test astronauts
Which vectors shows the direction of the centripetal acceleration at this point?
A. A
B. B
C. C
D. D
[PLEASE SOMEONE HELP! ASAP]
Answer: B
Explanation: just did the quiz
Vector B shows the direction of the centripetal acceleration at this point.
What is centripetal acceleration?Centripetal acceleration is the acceleration of a frame traversing a circular path. because the pace is a vector quantity (this is, it has both a magnitude, the rate, and a course), when a frame travels on a circular course, its route continuously adjustments, and accordingly its velocity changes.
What reasons for centripetal acceleration?Centripetal forces motivate centripetal accelerations. within the special case of the Earth's circular motion around the sun – or any satellite's ground movement around any celestial body – the centripetal force causing the movement is the end result of the gravitational enchantment among them.
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A man bungee jumps off a bridge and is brought to a rest by the stretched
bungee cord. This is an example of which of the following?
A. long time, small force
B. long time, large force
C. short time, small force
D. short time, large force
Who knows the answer
Answer:
I'm pretty sure it's A. long time, small force.
If an object is in free fall for four seconds, about how fast
will it be falling?
a) 10 m/s
b) 20 m/s
c) 30 m/s
d) 40 m/s
If the force of gravity on an object increases, what happens to its weight?
Answer:
It also increases
Explanation:
The strength of the gravitational force between two objects depends on two factors, mass, and distance. the force of gravity the masses exert on each other. If one of the masses is doubled, the force of gravity between the objects is doubled. increases, the force of gravity decreases.
A motorcyclist started a race from the start line and from rest, and accelerated with the acceleration of 3m/s2 for 8 secs. Then he was moving with a constant velocity for 2 secs. What was the racer’s position from the start line after 9+2 seconds from the start of the race?
Answer:
I dont even know my g
Explanation:
Like i cant even help u
Do waves transfer or transport energy
Answer:
i think transport energy....but i'm not sure ...
Explanation:
A wave carries energy and momentum but does not carry matter: the particles vibrate around the equilibrium position but do not travel with the disturbance
what is a scientific model in short words
Answer:A scientific model is a physical and/or mathematical and/or conceptual representation of a system of ideas, events or processes. Scientists seek to identify and understand patterns in our world by drawing on their scientific knowledge to offer explanations that enable the patterns to be predicted.
Explanation: got right
Answer:
A scientific model is a physical and/or mathematical and/or conceptual representation of a system of ideas, events or processes. Scientists seek to identify and understand patterns in our world by drawing on their scientific knowledge to offer explanations that enable the patterns to be predicted.
On Earth, a scale shows that you weigh 360 N. What is your mass?
Answer:
this might be confusing but..
Explanation:
To find an object's mass using its weight, the formula is Mass equals Weight divided by the Acceleration of Gravity (M = W ÷ G). Convert the weight measured in pounds to the equivalent in Newtons. In the formula for determining mass based on weight, mass is measured in Newtons.
Which game most represents a wave?
Answer:
D: tipping over dominoes
Explanation:
tipping over dominoes makes a wave-like movement
Answer:
the answer is D. just got it right 4/19/22
Explanation:
Mechanical and chemical weathering depend on _______________________________________ and temperature.
A.) acid
B.)air
C.)water
Answer:
C.)water
Explanation:
Weathering is the physical disintegration and chemical decomposition of rocks to form sediments and soils.
Mechanical weathering is the breaking down of rocks by physical means.
Chemical weathering is the decay of rocks by chemical means.
Both chemical and mechanical requires water for the processes to occur. Water is usually the medium for chemical actions to take place in a rock. For mechanical processes, water in different phases plays a very important role too.A 100-g bullet is fired from a rifle having a barrel 0.600 m long. Choose the origin to be at the location where the bullet begins to move. Then the force (in newtons) exerted by the expanding gas on the bullet is 15 000 1 10 000x 2 25 000x 2 , where x is in meters. (a) Determine the work done by the gas on the bullet as the bullet travels the length of the barrel. (b) What If? If the barrel is 1.00 m long, how much work is done, and (c) how does this value compare with the work calculated in part (a)?
Answer:
a) W=9000J
b) W=11,666.67 J
c) The work done by the gas with a 1 meter barrel is 2,666.67 J greater than the work done by the gas with a 0.600 m barrel. This is about 1.3 times greater.
Explanation:
(The function written in the problem isn't too clearly written, but I believe it should be like this:
A 100-g bullet is fired from a rifle having a barrel 0.600 m long. Choose the origin to be at the location where the bullet begins to move. Then the force (in newtons) exerted by the expanding gas on the bullet is [tex]15 000 + 10 000x - 25 000x^{2}[/tex] , where x is in meters. (a) Determine the work done by the gas on the bullet as the bullet travels the length of the barrel. (b) What If? If the barrel is 1.00 m long, how much work is done, and (c) how does this value compare with the work calculated in part (a)?)
a)
Since the force applied to the bullet is going to vary with the length of the barrel, we will need to make us of integration to find the work done by the gas.
So first, we start by drawing a sketch of what the problem looks like. (See attached picture). This will help us visualize the problem better.
Now, work is defined as the following integral:
[tex]W=\int\limits^a_b {F} \, dx[/tex]
The problem tells us the force exerted by the expanding gas on the bullet is:
[tex]F(x)=15,000+10,000x-25,000x^{2}[/tex]
So we go ahead and substitute this function into the integral.
[tex]W=\int\limits^{0.6}_0 {15,000+10,000x-25,000x^{2}} \, dx[/tex]
Now, before integrating that function, we can factor it so it is easier for us to integrate and to deal with the values, so we can factor a common 5,000 out, so we get:
[tex]W=5,000\int\limits^{0.6}_0 {3+2x-5x^{2}} \, dx[/tex]
and we proceed to integrate so we get:
[tex]W=5,000[3x+x^2-\frac{5}{3}x^{3}]\limits^{0.6}_0[/tex]
and evaluate the integral, so we get:
[tex]W=5,000([3(0.6)+(0.6)^2-\frac{5}{3}(0.6)^{3}]-[3(0)+(0)^2-\frac{5}{3}(0)^{3}][/tex]
Which yields:
W=9000J
b)
For part b we follow the exact same procedure but we change the limits of integration for 0 and 1 so the integral looks like this:
[tex]W=\int\limits^1_0 {15,000+10,000x-25,000x^{2}} \, dx[/tex]
and we get the following answer:
[tex]W=5,000[3x+x^2-\frac{5}{3}x^{3}]\limits^1_0[/tex]
and
[tex]W=5,000([3(1)+(1)^2-\frac{5}{3}(1)^{3}]-[3(0)+(0)^2-\frac{5}{3}(0)^{3}][/tex]
so
W=11,666.67 J
c) The difference between the two works we calculated is:
11,666.67J-9000J=2,666.67J
so the work done by the gas with a 1 meter barrel is 2,666.67 J greater than the work done by the gas with a 0.600 m barrel.
if we did the following division:
[tex]\frac{11,666.67}{9,000}=1.3[/tex]
So we can see that this is about 1.3 times greater.
4. The lightest pilot-driven airplane ever built was the Baby Bird. Suppose the Baby Bird moves along the ground without a pilot at a speed of 88.0 km/h. Under these circumstances, the momentum of the empty plane would be only 2,790 kg • m/s. What is the mass of the plane?
Answer:
Explanation:
mass x velocity
so i believe it'd be
2,790 x 88.0
but i could be wrong just an fyi
The most popular commercial aircraft worldwide range in weight from 30,900 to 127,000 pounds. Personal aircraft typically weigh between 740 to 2,750 pounds, which is a significant reduction in weight. The weight of a modern fighter jet ranges from 20,300 to 45,000 pounds. Aircraft are hefty.
How do you determine an airplane's weight?Determine the empty weight of the aircraft and the weights of passengers, luggage, and fuel by consulting the pilot's operating manual. To determine the moment, multiply each weight by the arm, which is the separation from the reference datum. To determine the gross weight, add up all the weights. To find the total moment, add all the moments together. The maximum weight of an aircraft is determined by the amount of lift that the wings or rotors can provide under the operational conditions for which the aircraft is designed. The maximum weight that the aircraft can safely carry is also limited by its structural strength. Empty weight (EW) is the sum of the manufacturer's 'as built' empty weight (MEW), any standard items (SI), and any operator items (OI), so EW = MEW + SI + OI. The EW is calculated for each aircraft series and each unique configuration of an aircraft and is validated by weighing it on a regular basis.To learn more about Mass of the plane refer to:
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Which of the following groups have one valence electron and are very reactive
A-column 1 alkali metals
B-Column 2 alkaline earth metals
C-column 17 halogens
D-column 18 noble gases
how does the number of protons change as atomic number increases by one
a cheetah goes from standing still to running at 60 mph in 3 seconds. what is the cheetahs acceleration in standard international units?
The acceleration of the cheetahs in the standard international units would be 8.938 meters/second².
What is acceleration?The rate of change of the velocity with respect to time is known as the acceleration of the object.
As given in the problem a cheetah goes from standing still to running at 60 miles per hour in 3 seconds
1 mile = 1609 meters
60 miles = 60×1609 meters
=96540 meters
1 hour = 3600 seconds
the initial velocity of the cheetah = 0
the final velocity of the = 96540/3600
=26.8166 meters/seconds
acceleration = (final velocity - initial velocity) /time period
=(26.8166 -0)/3
=8.938 meters/second²
Thus, the cheetah's acceleration would be 8.938 meters/second².
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In 1978, Geoff Capes of the United Kingdom won a competition for throwing 5 lb bricks; he threw one brick a distance of 44.0 m. Suppose the brick left Capes' hand at an angle of 45.0° with respect to the horizontal a. What was the initial speed of the brick? b. What was the maximum height reached by the brick?
Answer:
A) 20.8 m/s
B) h_max = 11 m
Explanation:
A) Formula for projectile range is;
R = (u²sin2θ)/g
We want to find initial velocity, so let's make u the subject.
u = Rg/sin2θ
We are given;
R = 44 m
θ = 45°
Thus;
u = √[(44 × 9.8)/sin 2(45)]
u = √[431.2/sin 90]
u = 20.77 m/s ≈ 20.8 m/s
B) maximum height will be gotten from the formula;
h_max = (R tan θ)/4
h_max = (44 × tan 45)/4
h_max = (44 × 1)/4
h_max = 11 m
Tanya and her brother are racing with their new bikes in the neighborhood. Their block is one mile long. Tanya's average speed is 0.15 mi/s and her brother's is 0.11 mi/s. Who will reach the end of block first, and how much time ahead of the other will they be?
Answer:
Tanya
[tex]2.43\ \text{s}[/tex]
Explanation:
[tex]d[/tex] = Distance traveled = 1 mile
[tex]s_t[/tex] = Tanya's average speed = [tex]0.15\ \text{mi/s}[/tex]
[tex]s_b[/tex] = Tanya's brother's average speed = [tex]0.11\ \text{mi/s}[/tex]
Time taken by Tanya
[tex]t=\dfrac{d}{s_t}\\\Rightarrow t=\dfrac{1}{0.15}\\\Rightarrow t=6.67\ \text{s}[/tex]
Time taken by Tanya's brother
[tex]t=\dfrac{d}{s_b}\\\Rightarrow t=\dfrac{1}{0.11}\\\Rightarrow t=9.1\ \text{s}[/tex]
So Tanya will reach the end of the block first.
She will reach the end of the block by [tex]9.1-6.67=2.43\ \text{s}[/tex]
A set of three resistors are set up in parallel. The resistor values are R1 = 3.0 Ohms, R2 = 11.0 Ohms, and R3 = 7.5 Ohms.
What is the total resistance of this circuit?
a
1.79 Ohms
b
0.60 Ohms
c
1.12 Ohms
d
2.97 Ohms
Answer:
A) 1.79ohms
Explanation:
Total resistance of resistors in parallel is given by ;
1/R = 1/R1 + 1/R2 +1/R3
Put in the values and make R the subject
When the amount of which 2 gases in the atmosphere change, the amount of energy absorbed by the surface changes.
Answer:
The earth-atmosphere energy balance is the balance between incoming energy from the Sun and outgoing energy from the Earth. Energy released from the Sun is emitted as shortwave light and ultraviolet energy. When it reaches the Earth, some is reflected back to space by clouds, some is absorbed by the atmosphere, and some is absorbed at the Earth's surface.
Explanation:
Antimony is like a nonmetal in that it is a brittle, crystalline solid, has poor electrical and heat conductivity, and has a low boiling point. However, it is also like a metal because of its shiny silver appearance and ability to form alloys.
Which of the following statements best describes antimony?
Answer:
Antimony is metalloid
Explanation:
From the properties of the metals given, we can conclude that antimony is pure a metalloid.
A metalloid has the properties of metals and non-metals.
Most metalloids will only conduct heat and electricity under certain conditions so they are poor conductors. As expected of a metal, it should be malleable and ductile but antimony is brittle and a crystalline solid. Although, it can form an alloy. We can see that most of the properties of this metal is in between those of true metals and non-metals. Therefore, antimony is a metalloid.