In the absence of a net force, an object can be at rest or in motion with a constant velocity.
What is Newton's first law of motion?Newton's first law of motion states that an object at rest or uniform motion in a straight line will continue in that path unless acted upon by an external force.
This law is also called the law of inertia because it depends on mass.
F(net) = ma
when, F(net) = 0, acceleration will be zero and velocity will be constant.
Thus, in the absence of a net force, an object can be at rest or in motion with a constant velocity.
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Which of the following divisions of time is NOT based on an orbital property of the Earth, Sun, and Moon?
1 The year
2 the Month
3 the day
To my knowledge, it would be the day.
one year: earth revolves around the sun
one month: moon revolution around the earth
one day: the earth rotation about its axis
However, nothing above indicates what day of the week it is; you can tell when a day has passed, but not what day of the week is.
Hope this helps!
-Moiselle
When a pitcher throws a baseball, it reaches a top speed of 39 m/s. if the
baseball takes 1.5 seconds to travel from the pitcher to the catcher, what is
its acceleration? (assume the ball is moving at 0 m/s right before it leaves
the pitcher's hand.)
a. 17 m/s2
b. 23 m/s2
o c. 11 m/s2
d. 26 m/s2
From the calculation, the acceleration of the body is 26m/s^2.
What is motion under gravity?When an object is thrown up or down, the motion of the body is influenced by the gravitational pull on the body.
Now;
Given that;
v = 39 m/s
t = 1.5 s
u = 0 m/s
a = ?
v = u + at
v = at
a = v/t
a = 39 m/s/1.5 s
a = 26m/s^2
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What is radiation produces a wave full energy.
Answer:
electromagnetic radiation hopefully
Which of the following statements about the periodic table is true?
Answer:
elements are the same columns are similar in there property
Explanation:
7. A 25,000 kg subway train initially traveling at 15.5 m/s slows to a stop in a station and then stays there long enou
brakes in stopping the train is transferred as heat uniformly to all the air in the station, by how much does the air t
1020 J/(kg C°).
2.123 C°
1.678 C°
3.007 C*
0.157 C
The temperature in the station changes by 0.157 °C
What is energy?We know that energy is the capacity to do work and it can neither be created nor destroyed. The kinetic energy of the moving vehicle is converted to thermal energy.
Thus;
1/2mv^2 = mcdT
0.5 * 25,000 * (15.5)^2 = 25,000 * 1020 * dT
dT = 0.5 * 25,000 * (15.5)^2/25,000 * 1020
dT = 0.157 °C
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Three 3.0 ohm resistors are connected in parallel .What is the equivalent resistance?
Answer:
3/2 Ω
Explanation:
ONE WAY :
1/ (1/3 + 1/3) = 1/(2/3) = 3/2 Ω
When you have two resistors in parallel , here is another way
3*3 /(3+3) = 9/6 = 3/2 Ω
( you can use this method ONLY when you have two parallel resitances !)
Which of the following is a form of technology ?
A. a lollipop stick
B. a city park
C. a public transit system
D. a television
Before hoop skirts, women who wanted their gowns to feature large skirts wore many heavy layers of a material called crinoline, which was made from thread and what other material?.
Answer:
Horsehair, cotton, or linen
Explanation:
A microwave has a typical wavelength of about 0.1 meter. What is the comparable wavelength of a radio wave?
It depends on the frequency.
Less than 0.1 meter.
Equal to 0.1 meter.
Greater than 0.1 meter.
Answer: Answer down below.
Explanation:
A car speedometer has a 4% uncertainty. what is the range of possible speeds when it reads 100 km/h? km/h (lowest) km/h (highest)
Answer:
104 highest and 96 the lowest
Explanation:
it has an uncertainness of 4%Meaning 104%on the highest and 96 on the lowest
how does light behaves when light passes through water?
light bends towards the normal when passing from air to water.
Explanation:
when Light passes from air to water It gets refracted and bend towards normal and if it passes from water to air it bends away from normal. This is because of the difference in density of the medium. Light when passing through higher density to lower bends away from normal and on passing through lower density to higher bends towards normal.
in general, some of the rays of light will reflect from the surface of water but other will pass through the water. The normal is the perpendicular line drawn on the surface at the exact point of incident.
This homework is meant to be in for today first lesson, please help!!!
Some power stations burn wood instead of fossil fuels to generate electricity. A coal burning power station burns 6 million tonnes of coal per kg. Coal has a average energy value of 29.25 MJ per year. Wood chip from willow trees has an energy value of 13 MJ per kg. A hectare of agricultural land can produce 9 tonnes of drt willow wood per year. If this power station burned dry willow wood instead of coal, how much agriculture land would be needed to grow the willow?
The agriculture land needed to grow the willow is 1500000 Hectares
What is Power?Power can be defined as the rate at which work is done by an object. The S.I unit of power is Watt(W).
A coal burning power station burns 6 million tonnes of coal per kg. Coal has a average energy value of 29.25 MJ per year. Wood chip from willow trees has an energy value of 13 MJ per kg. A hectare of agricultural land can produce 9 tonnes of drt willow wood per year.
The coal consumption per year = 29.25 x 1000 x 6000000
=175500000000 MJ
If this power station burned dry willow wood instead of coal, agriculture land would be needed to grow the willow,
1 hectare of willow will produce 9 x 13x 1000 = 117000 MJ.
The agriculture land needed to grow the willow is
= 175500000000 MJ / 117000 MJ.
= 1500000 Hectares.
Thus, agriculture land needed is 1500000 Hectares.
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A combustion reaction is represented by __________________.
A. AB + C yields CB + A
B. A + B yields AB
C. Fuel + oxygen yields carbon dioxide + water
D. AB yields A + B
Answer:
The general equation for a complete combustion reaction is: Fuel + O2 → CO2 + H2O. The burning of charcoal is a combustion reaction
After fertilization in the fallopian tube, how many days will the zygote travel before arriving at uterus?.
After fertilization in the fallopian tube, It will take 6-12 days for the zygote to travel before arriving at the uterus.
What is a zygote?A zygote is, generally speaking, a cell created by the fusion of two gametes; the growing person is created from such a cell.
It takes the zygote around 6–12 days following fertilization in the fallopian tube for the fertilized egg to travel to the uterus and attach to the uterus, a process known as implantation.
Hence It will take 6-12 days for the zygote to travel before arriving at the uterus.
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3.
If A = 5 m/s at 30° and B is 6 m/s at 60°, what segment a - segment b?
-1.3x^ + 2.7y^
7.3x^+7.7y^
7.7x^+7.3y^
2.7x^+0.7y^
7
jjsjek
I am very intelligent and I am very excited to see the
The chart shows data for a moving object.
Time (s)
Velocity (m/s)
8
8
8
246
Which conclusion is best supported by the information
in the chart?
The object has negative displacement.
The object has negative acceleration
The object does not have displacement.
The object is not accelerating.
0000
From the given velocity and time of motion, the object is not accelerating.
Acceleration of the object
The acceleration of the object is determined from the change in velocity and change in time of motion as shown below;
a = Δv/Δt
where;
time of motion = 2 s, 4s, and 6 sv is velocity = 8m/s, 8 m/s and 8 m/sa = (8 - 8)/(4 - 2) = 0 m/s²
Thus, we can conclude that from the given velocity and time of motion, the object is not accelerating.
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Explain the basic physics of a satellite orbiting a planet. Include the following words: velocity, energy, kinetic energy, gravitational energy, time of orbit, distance between the planet and satellite.
Answer:
So in this question basically look at the basic phases, we started orbiting a planet, let's for the second definitely. So let's look at the plant to be for example. And you look at the earth. Right. Um so I suppose you have the Earth which and then you have started with the satellites basically launched into orbit like this. Right? So in the orbiter uh into orbit like this, I suppose it's in a circular orbit. For example, this now suppose the planet has a mass are and this orbit is kind of hitch above the surface of the planet and into orbit with certain frequency omega, right? Uh with certain frequency omega. And then of course, you know, um they there will be a centripetal force that's provided by the gravitational force. Right? So suppose the satellite has a mass M and the planet has a mass M. And then obviously um the gravitational force will be m times M over the orbit. The radius of the orbiter which is of course our plus H squared um as yeah, that would be the sort of multiple of course also by the gravitational constant. Right? This gives you the gravitational force and it provides you the centripetal force uh for the orbit. Right? So that is m times uh you know, uh omega squared times our plus H. Right? So um so you see that the and of course you can also rewrite this little bit. You see you can rewrite this like um times v squared over R plus H. Right? Um so basically this is the basic equation that basically tells you how I'll text you the promise of orbits, right? And obviously, um they put the energy of the of the of the system, the to the energy of the system actually is given by, you know, first you have the MRI squared right? And then um minus, you know, the, you know, the plastic presentation of energy which is G um over how to press ahead. So these are police energies is conserved. So I think this equation to tell you everything you probably need about the the orbit of a satellite.
A box is being dragged across the floor at a constant speed by a rope pulling horizontally on it. friction is not negligible. identify all the forces acting on the box.
Weight (W), the normal force( N), and the tension force( T )in the string will all be forces operating on the box.
What is tension force?The tension force is described as the force transferred through a rope, string, or wire as opposing forces pull it.
The tension force is applied along the whole length of the wire, pulling energy equally on both ends.
A horizontally pulling rope is dragging a box across the floor at a consistent speed. Friction is significant.
Hence, the force acting on the box will be weight W, Normal force N, and the tension force T, in the string.
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help me please on this
Need help with question 3,5 please !
Answer:
Ok that 2 or 3 so for number 3
Explanation:
A shield of material that reflects neutrons is placed around a radioactive sample. Which change in the nuclear reaction is most likely to happen?
A chain reaction will be sustained in a subcritical mass.
The chain reaction in a critical mass will stop.
A chain reaction will occur at a constant rate in a critical mass.
The chain reaction in a supercritical mass will slow down.
Answer:
A chain reaction will be sustained in a sub-critical mass.
Explanation:
Hope this helps!
If not, I am sorry.
Answer:
The answer is A
Explanation:
I got it right duh
A source charge of 3 µc generates an electric field of 2.86 × 105 n/c at the location of a test charge. what is the distance, to the nearest hundredth, of the test charge from the source charge? k equals 8.99 times 10 superscript 9 baseline n times startfraction meters squared over coulombs squared. m
Hello!
Using the equation for the electric field produced by a source charge:
[tex]E = \frac{kq}{r^2}[/tex]
E = Electric Field Strength ( 2.86 × 10⁵ N/C)
k = Coulomb's Constant ( 8.99 × 10⁹ Nm²/C²)
q = Charge of source charge (3 μC = 0.000003 C)
r = distance of test charge from source charge (m²)
We can rearrange the equation to solve for distance to make plugging in values easier. (Isolate for 'r').
[tex]Er^2 = kq\\\\r^2 = \frac{kq}{E}\\\\r = \sqrt{\frac{kq}{E}}[/tex]
Plug in the given values.
[tex]r = \sqrt{\frac{(8.99*10^9)(3*10^{-6})}{(2.86*10^5)}} = \boxed{0.307 m}[/tex]
Answer:
0.31 m
Explanation:
What is the voltage in a circuit that has a current of 10.0 amps and a resistance of 28.5 ohms?
A.
2.85 volts
B.
285 volts
C.
0.35 volts
D.
18.5 volts
Answer:
OPTION B 285 volts
Explanation:
USE OHM'S LAW
V = IR
V = 28.5 ×10 = 285 volts
HOPE IT HELPED :)
Scientists study how the continents move. Why might scientists use a model
to show this movement?
A. It is too dangerous to observe directly.
B. It is too slow to observe directly.
C. It is too complex to observe directly.
D. It is too fast to observe directly.
SUBMIT
Answer:
B. It is too slow to observe directly
Explanation:
They move too slow to be able to observe how they move.
I hope it helps! Have a great day!
bren~
Answer:
B. It is too slow to observe directly
Explanation:
They move slowly so they would have to use a model to see how they would move since in real life they move extremely slowly.
I hope it helps! Have a great day!
bren~
09
Acceleration (m/s"2)
Observation - Daniel pushes a large cart on wheels across a
warehouse floor each day. He notices that as he increases the
mass for different loads he needs more force to push it at the
same rate as before. He asks the question "How does the
mass affect the acceleration of the cart?"
-5
Daniel asked a friend to help him do an experiment to answer
his question. The graph of the data is below.
9. Write at a high school level the science variable equation for
the best-fit line (HINT: Look at the image above).
0
Acceleration vs Mass
A=a/M
A = 160N
50
100
mass (kg)
As the mass of the cart is increased, more force must be applied to move the cart forward.
What is the Newton second law?According to the Newton second law of motion, the force is directly proportional to the acceleration is the mass is held constant.
Hence, we have the formula; F = ma. If the acceleration of the cart is given by and the mass is given by m, a = F/m.
Thus, as the mass of the cart is increased, more force must be applied to move the cart forward.
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The family of four below is lined up on ice skates. Dad is 80 kg, mom is 65 kg, the older sibling is 40 kg and the younger sibling is 20 kg. Their plan is to all push forward to launch the younger sibling as fast as possible. How will the other three family members move if they succeed
The other three family members succeed if they move to the back.
What is momentum?Momentum of any object is the product of the velocity of the object and its mass.
According to the conservation of linear momentum, when no external force acts on the system, the momentum remains conserved.
The final momentum must be equal to the initial momentum.
To give younger one, the momentum in forward direction, all must move in opposite direction.
Thus, other three family members succeed if they move to the back.
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Two arrows are fired simultaneously with the same speed of 30. 0 m/s. Each arrow has a mass of 0. 100 kg. One is fired due east and the other due south. What is the magnitude of the total momentum of this two-arrow system?.
Answer: 4.24 kg ⋅ m/s
Explanation:
[tex]$$The total momentum of the system is given by:$$p=\sqrt{p_{1}^{2}+p_{2}^{2}}$$According to the information provided, the momentum of first system $p_{1}$ is equal to momentum of second system $p_{2}$$$\begin{aligned}&p=\sqrt{2 p_{1}^{2}} \\&=\sqrt{2 \cdot(0.100 \mathrm{~kg} \times 30 \mathrm{~m} / \mathrm{s})^{2}} \\&p=4.24 \mathrm{~kg} \cdot \mathrm{m} / \mathrm{s}\end{aligned}$$[/tex]
Which best describes an example of an n-type semiconductor?
it uses phosphorus so that electrical conduction is due to the movement of electrons.
it uses phosphorus so that electrical conduction is due to the movement of a positive charge.
it uses gallium so that electrical conduction is due to the movement of electrons.
oit uses gallium so that electrical conduction is due to the movement of a positive charge.
Option A. N-type semiconductor uses phosphorus so that electrical conduction is due to the movement of electrons.
What is n-type of semiconductor?An N-type semiconductor is an impurity mixed semiconductor material used in electronics.
The N-type semiconductor uses pentavalent impure atoms like phosphorus and arsenic.
The conduction through an N-type semiconductor is majorly caused by the electrons.
Thus, n-type semiconductor uses phosphorus so that electrical conduction is due to the movement of electrons.
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Is the angular position of the first-order spectrum small enough for sinθ≈θ to be a good approximation?.
Answer:
15 to 30 so anywhere in between there.
it is proposed to use a small waterfall to turn an electricity generator. 10 meter cube of water fall 50m per minute. only one-fifth of its energy can be obtained usefully
This question is related to density where 16.7 kW power is used.
What is Density?Density is defined as mas per unit volume. It is denoted by ρ
We know the density of water is 1000kg/m³.
The given volume is 10m³. we have to find the mass. i.e. 10000 kg.
We know that [tex]Density =\frac{mass}{Volume}[/tex]
Mass = Density x Volume
Mass = 1000kg/ m³ x 10m³ = 10000kg.
Here, We know that work against gravity is mgh.
So, 10000 kg x 10 m/s² x 50m = 5000000J.
But only one fifth of its energy is used.
5000000 / 5 = 1000000
Now we have the work done and time, so lets solve power.
Power=work done /time
1000000/60sec.
Power =16666.67 or 16.7kW
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