Answer:
9.81 × 10 = 98.1 meters
vertical displacement is s=1/2 at^2 + vt
initial vertical velocity is 0 so s=1/2 at^2
a in this instance is gravitational acceleration so 60m= 1/2 (9.81)t^2
solve for t, t = 3.497s. //I corrected this answer as just now I misread horizontal as vertical.
*For free fall,
Initial velocity (u) = 0
g = 9.8m/s²
time(t) = 10s
Using the second equation of free fall;
s = ut + 1/2gt²
where 's' is the distance fallen.
s = 0(10) + 1/2(9.8)(10)²
s = 1/2(9.8)(100)
s = 490m.
*Initial horizontal velocity (Ux) = 3m/s
Initial vertical velocity (Uy) = 0
since it did not start with any vertical velocity.
Using the second equation of vertical downward motion:
h = Uyt + 1/2gt²
where h is the height of the cliff = 60m.
g = 9.8m/s²
60 = 0(t) = 1/2 (9.8)(t²)
60 = 4.9t²
t = √(60/4.9) = 3.5s.
An object has a mass of 300 g. (a) What is its weight on Earth? (b) What is its mass on the Moon?
(C) What will be its acceleration on the Moon when a 0.500 N resultant force acts on it?
Answer:
The mass of object is 300g.
Its weight on earth is W×0.3kg×9.8m/s2=2.94 N
Its weight on moon is A 300 g would be 48 g on the moon
GOOD LUCK!
Do heavier bowling balls go faster than lighter ones?
Answer:
lighter ones will go faster
Explanation:
assuming you throw both bolwing ball with 10N of force. one is 3kg and the other is 5kg.
by using the equation: F = ma
a = F/m
a = 10/5 = 2m/s^2
a = 10/3 = 3.33333 m/s^2
Lab partner says in newton second law by pushing a 10 KG object with 10 N and then pushed a 20 KG object with 20 in. They wanted to see effect of doubling the force of an object which choice explains why this I cannot be used to show the effect of
Answer:
must double the force, with the same masses you get twice the acceleration.
Explanation:
Newton's second law establishes a relationship between force and acceleration where the constant of proportionality is mass
F = m a
To prove these relationships you must double the force, with the same masses you get twice the acceleration.
2F = m 2a
The downside is that if you double the mass, the acceleration stays the same.
2F = 2m a
Define Work And its types
Positive Work.
Negative Work.
Case of zero work done.
Displacement at an angle to the force.
Energy.
Kinetic Energy.
work is the energy transferred to or from an object via the application of force along a displacement. In its simplest form, it is often represented as the product of force and displacement.
what is lever? state the principal of liver.
high pressure
system the air moves (up/down) and brings
(good/bad) weather
Answer:
high pressure system in the air moves up and brings good weather
give me thanks >:(
Imagine a 0.2 kg ball moving at 5 m/s colliding with a 0.3 kg ball moving at 2 m/s in the same direction. After the collision the 0.2 kg green ball stops moving and the 0.3 kg purple ball continues moving in the same direction.
Answer:
[tex]m1v1 + m2v2 = m1v3 + m2v4[/tex]
[tex](0.2 x 5) + (0.3 x 2) = (0.2 x 0) + (0.3 x v4)[/tex]
[tex]1.0 + 0.6 = 0 + 0.3v4, 0.3v4 = 1.6[/tex]
[tex]v4 = 1.6/0.3 = 5.3 m/s (2 sf)[/tex]
Why is it important for earth’s magnetic field that the inner core is hotter then the outer core?
A. The inner core heat produce stuff
it important for earth’s magnetic field that the inner core is hotter then the outer core because, the inner core provides the heat source for outer core convection. Hence, option c is correct.
What is convection currents ?Convection is a mode of heat transfer in fluids. The hotter fluid molecules rises from the surface and makes other molecules also hot. The mantle fluid inside the earth core generates a convection current by the heat radiated from sun.
As a result of radioactive heating and chemical differentiation, the earth's outer core is currently experiencing turbulent convection. This creates a process where the convective kinetic energy is transformed into electrical and magnetic energy, much resembling a naturally occurring electrical generator.
In essence, electric currents are induced by the movement of electrically conducting iron in the presence of the earth's magnetic field. Hence, option c is correct.
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When a neutrally charged atom loses an electron to another atom, the result is the creation of ________?
Answer:
Nuclear Fission
Explanation:
Answer:
B. It must readily accept electron flow.
Explanation:
2) A car going down the road has a velocity of 20 m/s. If the car continues at this
rate for 7 seconds how far did the car go?
Answer: 140
Explanation: just multiply 7 x 20
As waves get closer to a beach they _____.
increase in length
decrease in height
decrease in energy
increase in energy
Answer:
Increase in energy
Explanation:
the difference between endothermic and exothermic reaction
If a bag of pretzels says it contains 10 servings, and each serving is 150 calories, how many calories would you consume if you ate the entire bag?
300, adding extra healthy calories
1,000, adding extra unnecessary calories
1,500, adding extra unnecessary calories
2,000, adding extra healthy calories
Answer:
5400
Explanation:
i calculated it
Big brain
Select the correct answer.
Rebecca would like to get started on a Mediterranean diet for optimal health. Which changes would you recommend?
A.
Avoid meats, poultry, and fish, and eat more fruits, vegetables, and whole grains.
B.
Choose meat and poultry for most meals, and limit fat.
C.
Consume fish and olives and avoid red meat.
D.
Eat a wide variety of fruits, vegetables, and beans, and avoid any alcohol.
13. Suppose you have an object tied to a rope and are rotating it over your head in uniform circular motion. If you increase the
length of the rope, would you have to apply more or less force to maintain the same speed?
a. More force is required, because the force is inversely proportional to the radius of the circular orbit.
b. More force is required because the force is directly proportional to the radius of the circular orbit.
c. Less force is required because the force is inversely proportional to the radius of the circular orbit.
d. Less force is required because the force is directly proportional to the radius of the circular orbit.
Answer:
The correct option is (c).
Explanation:
When an object tied to a rope and we rotate it, the centripetal force acting on it. This force acts towards the center of the circle. The magnitude of the force is given by :
[tex]F=\dfrac{mv^2}{r}[/tex]
Where,
m is mass, v is speed and r is radius of path
If the length of the rope is increased, it means it will make a large circle i.e. large radius.
As we can see that force is inversely proportional to the radius of circle. It means less force is required because the force is inversely proportional to the radius of the circular orbit. Hence, the correct option is (c).
To move an object at a constant speed after increasing the length of the rope, less force is required because the force is inversely proportional to the radius of the circular orbit. Thus option C is correct.
The force applied to the object moving in a circular motion can be given by:
[tex]\rm Force\;=\;\dfrac{mass\;\times\;(speed)^2}{radius}[/tex]
From the equation, it is evident that force has been inversely proportional to the radius of the circular path. Since the length of the rope is doubled, the radius the circular path has also been doubled.
If we apply the same unit of force, the speed of the motion will increase, as speed has been directly proportional to the force applied.
Thus, to maintain the object at a constant speed, the force applied to the object has been reduced.
So, in order to move an object at a constant speed after increasing the length of the rope, less force is required because the force is inversely proportional to the radius of the circular orbit. Thus option C is correct.
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Rob is a high school student taking both algebra and geometry. Last night he had 27 homework problems combined from the two classes, and he took a total of 90 minutes to do them. If each algebra problem took him 2 minutes and each geometry problem took him 5 minutes, how many algebra problems did he have for homework?
Answer:
The answer is D
Explanation:
The number of algebra problems did he have for homework is 15.
The calculation is as follows:Here we assume x represent the number of algebra problems. So, the number of geometry problems was 27-x and the total working time was ...
2x +5(27 -x) = 90
-3x = 90 -135
-3x = -45
x = 15
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balance of chemical equations
Answer:
an equation is balanced when the same number of each element is represented on the reactant and product sides. equations must be balanced to accurately reflect the law of conservation of matter.
mass of 25 kg and a KE of 450 J.
Two kids are playing tag. The first kid is running at an unknown speed chasing the other. The first kid has
How fast is the first kid running?
answer =
Answer:
6m/s
Explanation:
A simple machine where an inclined plane is wrapped in a spiral is called a centripetal ramp.
T.
True
F.
False
Answer: False
Explanation:
What is the chemical formula for Tetrasulfur pentoxide
( explain)
Answer:
s4n4 the chemical formula
The chemical formula of tetrasulfur pentoxide is S₄O₅, as it has four sulfur atoms and five oxygen atoms.
What is chemical formula ?Chemical formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols of elements. It also makes use of brackets and subscripts.
Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form is called empirical formula.
It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.
There are four types of chemical formula:
1)empirical formula
2) structural formula
3)condensed formula
4)molecular formula
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which two factors affect the amount of thermal energy an object has?
Answer:
Its The average kinetic energy and the number of particles.
Explanation:
The amount of thermal energy of the object depends on the average kinetic energy of the particles and the total number of particles in the system.
What is thermal energy?It can be defined as the form of the energy in which heat is transferred from one body to another body due to their molecular movements, thermal energy is also known as heat energy.
As given in the problem statement we have to find out the two factors that affect the amount of thermal energy of the object,
The total amount of thermal energy = The average kinetic energy ×number of particles
The average kinetic energy of the particles in the system and the overall number of particles affect the object's thermal energy.
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HALP i offer lots plz answer both questions
+brainlyest
+points
Answer:
D
Explanation:
B: false
How does the number of fins affect energy transfer?
Answer:
Because the more coolant passed through the fins, the more energy can be emitted
A clock which has brass pendulum beats seconds correctly when the temperature of the room is 30° C. how many seconds will it gain or lose per day when the temperature of the room falls to 10° C?
Answer:A::C
Solution :
ΔT=
1
2
TαΔθ
rArr Δt=
ΔT
T1t
But T′≈T
∴Δt=
1
2
αΔθ(t)
=
1
2
×0.000012×20×24×3600
=10.37s
At higher temperture, length of pendulum clock will be more. So, time period will be more and it will lose the time.
Explanation:
10. How does surface area affect the amount of air resistance an object experiences?
Answer:cross-sectional area, and thus surface area, increases the amount of air resistance an object experiences
Explanation:
An Austin volleyball player bumps a 5 kg ball into the air. It reaches a height of 2.8 meters. How fast was the ball going as it got bumped into the air?
O 137.2 m/s
O 7.4 m/s
O 19.6 m/s
O 14 m/s
Answer:
v = 7.4 m/s
Explanation:
Given that,
Mass if a volleyball, m = 5 kg
The ball reaches a height of 2.8 m
We need to find how fast the ball is going as it bumped into the air. Ket the velocity is v. Using the conservation of energy to find it as follows :
[tex]mgh=\dfrac{1}{2}mv^2\\\\v=\sqrt{2gh} \\\\v=\sqrt{2\times 9.8\times 2.8} \\\\=7.4\ m/s[/tex]
So, the required speed is 7.4 m/s. Hence, the correct option is (b).
unicellular
organism are
Explanation:
Its organism are one cell I think
What is the potential difference (voltage) if the resistance of 20 ohms produces a current of 10 amperes?
Answer:
200 volts
Explanation:
Ohm's Law: V = IR
I = 10 A
R = 20 ohms
V = (10)(20) = 200 volts
Potential difference (voltage) across a resistor of 20 ohms produces a current of 10 amperes is 200V.
What is Ohms law ?Ohm's law states that the potential difference across a conductor is directly proportional to the current flowing through it.
i.e. Voltage V [tex]\alpha[/tex] I ......Voltage is directly proportional to the current flowing through a resistance.
V = RI
where R is a constant of proportionality called as resistance of Resistor. it opposes flow of current and it is measured in ohm(Ω). ohm's law gives the voltage drop across a resistor. large resistor gives large voltage drop across it.
Given,
Resistance R = 20 Ω
Current I = 10 A
Voltage V = ?
By using formula,
V = IR
V = 10×20
V = 200V
Hence potential difference across the resistor is 200V
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A bamboo plant grows at an average rate of 3.75 cm/h. How much will it grow inc6 hours
Answer:
22.5 inches in 6hours
Explanation:
Because it tells us it grows 3.75 an hour which is an ratio of 3.75 to 1 so you would just multiply 3.75 with 6
Hope this helps
Why did boy (the observer) hear the pitch of the sound change? What does this tell us about the frequency of the sound? Support your conclusion based on results from the experiment and your knowledge of sound waves.
Answer:
because of the doppler effect
Explanation:
Remember, the doppler effect refers to the changes in sound (frequency of sound) observed by a person who is in a position relative to the wave source.
In this example, we notice as the train comes closer to the boy, the sound becomes louder also increasing the pitch slightly, the doppler effect sets in when the train passes the boy because the boy notices a decrease in the pitch of the moving train.
We learn from the change in the observed sound of the train that the frequency of the sound is determined by the distance of the observer from the wave source.
In other words, the closer the source of the sound to the observer; the faster it travels to the observer, however, the farther it is; the lesser it is; the greater the sound heard.
