Answer:
Velocity = 0.0001389 m/s
Explanation:
Given that the
Distance covered = 1 metre
Time taken = 2 hours
Convert the hour to second
1 hour = 60 × 60 = 3600
2 hours = 2 × 3600 = 7200
What is the velocity of a worm moving 1 meter in 2 hours to the East?
Velocity can be referred as speed.
Velocity = distance/ time
Velocity = 1/7200
Velocity = 0.0001389 m/s
Which is a scientific claim?
A. Observations of certain stars explain why humans behave the way they do.
B. The constellation Orion is the easiest to recognize because of the stair in its belt.
C. Three stars in the constellation Orion looks like a belt that hunter would wear.
D. Observations of constellations show that stars have moved over time.
Answer:
D. Observations of constellations show that stars have moved over time.
Explanation:
A scientific claim is basically an observation in science.
Constellation changes there position over time because of earth's rotation around sun. So, observation of constellations shows that stars have moved over time is a scietific claim. If stars would not move then constellation will not form.
Hence, the correct answer is "of constellations show that stars have moved over time".
Answer: D
Explanation:
Over an interval of 6 months, the tilt of the Earth’s spin axis with respect to the surrounding star fields changes by
Answer:
0°
Explanation:
Every 41,000 years, the axial tilt of the Earth varies by oscillating between 22.1 degrees and 24.5 degrees such that the Earth axis orientation with respect to background stars is relatively constant (change is 0) while rotating over one orbital period which is a duration of 12 months. The effect is that the direction of the North or South pole towards the Sun is dependent on the side of the Earth orbit the Earth is located bringing about seasonal variation.
In an effort to decrease the mAs of an exposure, the 15% rule of kVp change may be considered. Changing the original kVp of 84 using the 15% rule will have what impact
Answer:
Will result in :Greater Compton scatter interaction
Explanation
This is because The 15% rule states that changing the kVp by 15% has the same effect as doubling the mAs, or reducing the mAs by 50%; that is A 15% increase in kVp has the same effect as doubling the mAs and vice versa but in this case reducing mas causes more Compton scatter because Compton scattering occurs at a lower kvp
The radii of a wheel are 25cm and 5cm respectively.It is found that an effort of 40N is required to raise slowly a load of 160N.Find mechanical advantage
Answer:
4Explanation:
Mechanical advantage is defined as the ratio of the load to the effort applied to raise the load. If minimal effort is used to overcome a much larger load, that is when we have what is called mechanical advantage i.e a machine has been used to our advantage.
Mathematically, MA = Load/Effort
Given parameters
Load = 160N
Effort = 40N
Required
Mechanical Advantage
Using the formula above
MA = 160N/40N
MA = 4
advantage
Many types of scientific equipment are used to perform different functions in the science lab.Which of the folllowing combinations of equipment would be needed to bring one liter of water to 85 degree
Answer:
Many types of scientific equipment are used to perform different functions in the science lab. Which of the following combinations of equipment would be needed to bring one liter of water to 85°C? a. ... Various pieces of safety equipment are used in the lab to provide protection against injury.
Explanation:
What is a Joule, and what are the SI units for a Joule?
The joule is a derived unit of energy in the International System of Units. It is equal to the energy transferred to an object when a force of one newton acts on that object in the direction of the force's motion through a distance of one metre.
Joule, unit of work or energy in the International System of Units (SI); it is equal to the work done by a force of one newton acting through one metre. Named in honour of the English physicist James Prescott Joule, it equals 107 ergs, or approximately 0.7377 foot-pounds.
1. What is the mechanical energy (sum of PE +KE) throughout her trip? 2. Where is potential energy the highest? 3. Where is kinetic energy the highest? 4. Relationship statement: Height above ground to potential energy. As 5. Relationship statement: Speed (velocity) to kinetic energy. As
Answer:
1)50000J
2) At the start of the trip
3) At the end of the trip
4) The higher the height above the ground, the higher the potential energy
5) As speed increases, Kinetic Energy increase
how does the half life of an isotope relate to the stability of its nucleus?
Answer:
The longer the half-life, the more stable the nucleus is.
Explanation:
Well, you know that nuclear half-life represents the time needed for an initial sample of a radioactive substance to be halved. If this is the case, a long half-life would imply that it takes a very long time for the nuclide to decay to half of its initial mass. This of cource means that it is very stable.
hope this helped c; if it did give me the brainlist please c;
Answer:
If the half-life is shorter the nucles is more unstable and vice versa
What is the acceleration of a skydiver who starting from rest reaches a speed of 40m/s in 4s?
Answer: 10 meters/ second squared
Explanation:
started from rest means that its initial velocity is 0
acceleration=(v final - v initial) / time
a= (40 - 0)/4
a= 10
give the SI unit. For physics
Answer:
metre (m) - unit of length
kilograms (kg) - unit of mass
second (s) - unit of time
ampere (A) - unit of electrical current
kelvin (K) - unit of temperature
mole (mol) - unit of the amount of substance
Explanation:
the scores of players on a golf team are shown in the table. the teams combined score was 0 what was travis's score?
Answer:
what table?
Explanation:
Answer:
-5
Explanation:
Plants that listen to hard rock will grow slower than plants that listen to classical music is an example of
Answer:
Ummm... I dont know what the question really is. But I would say in English terms it is an example of Personfiction I guess
Explanation:
heey help plz???????A block measuring 20cm by 10cm by 4 cm rests on a flat surface. The block has a weight of 600g. Determine: (a)The minimum pressure it exerts on the surface. (3 Marks (b) The density of the block in kg/Take (g = 10N/kg . (3 Marks
Answer:
a) 300 Pa
b) 750 kgm-³
Explanation:
P = F/A
Minimum pressure exerts when the largest area on the surface,
a) P = (0.6 × 10 ) / ( 20×10 × 10^-4)
= 300 Pa
b) D = m/v
= 0.6/ (20 × 10 × 4 × 10^-6)
= 750kgm^-3
A scale at a grocery store is made of a metal pan (of negligible mass) placed on an ideal spring. The spring has a force constant of 655 N/m. A customer gently rests 1.00 kgs of bananas and 2.00 kg of potatoes on the scale. When the 2.00 kg potatoes is suddenly removed, how high above the starting position do the bananas reach?
Answer:
The ideal spring is 0.030 meters above the starting position.
Explanation:
Let consider that spring is modelled by the Hooke's Law, which is represented by the following expression:
[tex]F = k\cdot \Delta x[/tex]
Where:
[tex]F[/tex] - Force exerted on the ideal spring, measured in newtons.
[tex]k[/tex] - Spring constant, measured in newtons per meter.
[tex]\Delta x[/tex] - Spring elongation, measured in meters.
The elongation is now cleared:
[tex]\Delta x = \frac{F}{k}[/tex]
The initial force experimented by the spring is due to the weight of bananas and potatoes.
[tex]F = (m_{b} + m_{p})\cdot g[/tex]
Where:
[tex]m_{b}[/tex], [tex]m_{p}[/tex] - Masses of bananas and potatoes, measured in kilograms.
[tex]g[/tex] - Gravitational acceleration, measured in meters per square second.
If [tex]m_{b} = 1\,kg[/tex], [tex]m_{p} = 2\,kg[/tex], [tex]g = 9.807\,\frac{m}{s^{2}}[/tex] and [tex]k = 655\,\frac{N}{m}[/tex], the initial elongation of the ideal spring is:
[tex]F = (1\,kg + 2\,kg)\cdot \left(9.807\,\frac{m}{s^{2}} \right)[/tex]
[tex]F = 29.421\,N[/tex]
[tex]\Delta x_{o} = \frac{29.421\,N}{655\,\frac{N}{m} }[/tex]
[tex]\Delta x_{o} = 0.045\,m[/tex]
The final elongation is obtained after eliminating the influence of potatoes due to gravity. That is to say:
[tex]F = m_{b}\cdot g[/tex]
[tex]F = (1\,kg)\cdot \left(9.807\,\frac{m}{s^{2}} \right)[/tex]
[tex]F = 9.807\,N[/tex]
The final elongation of the ideal spring is:
[tex]\Delta x_{f} = \frac{9.807\,N}{655\,\frac{N}{m} }[/tex]
[tex]\Delta x_{f} = 0.015\,m[/tex]
The displacement of the spring due to the removal of potatoes is:
[tex]d = \Delta x_{o} - \Delta x_{f}[/tex]
[tex]d = 0.045\,m-0.015\,m[/tex]
[tex]d = 0.030\,m[/tex]
The ideal spring is 0.030 meters above the starting position.
A positively charged object is placed to the left of a negatively charged object. Which best describes how the positively charged object will move
Explanation:
As per the law of electrostatics, two positive or negative charge repel each other while two opposite charge attract each other.In this case, a positively charged object is placed to the left of a negatively charged object. It would mean that the positive charge move in the direction of negative charge, so as to attract each other. Hence, the positively charged object will move to the right.Answer: B
Explanation:
Got it right on edge
mike shoots a large marble (Marble A, mass:0.05 kg) at a smaller marble (Marble B, mass: 0.03 kg) that is sitting still. Marble A was initially lacking at a velocity of 0.6 m/s, but after the collision it has a velocity of -0.2 m/s what is the resulting velocity of marble B after the collision? be sure to show your work.
Explanation:
According to Conservation of Linear Momentum :
[tex]m_1u_1+m_2u_2=m_1v_1+m_2v_2[/tex]
[tex]0.05 \times 0.6 + 0.03 \times 0 = 0.05 \times - 0.2 + 0.03 \times v_2[/tex]
[tex]0.04 = 0.03v_2[/tex]
Velocity of marble B after collision = 1.33 m/sec
SOMEONE PLEASE HURRY!!! Identify when work is done and calculate work (in physics)
the satellites stay in their orbits around the earth without the need of any amount of fuel
Explain this statement
Answer:
Satellites are able to orbit around the planet because they are locked into speeds that are fast enough to defeat the downward pull of gravity. ... Satellites do carry their own fuel supply, but unlike how a car uses gas, it is not needed to maintain speed for orbit.
Answer:
The satellites move around the earth because of gravity which builds centripetal force allowing the satellite to stay in the orbit
In a double-slit interference experiment you are asked to use laser light of different wavelengths and determine the separation between adjacent maxima. You observe that this separation is greatest when you illuminate the double slit with
Answer:
y = m λ L / d
must use lasers of greater wavelength
Explanation:
The expression for the constructive interference of a double slit is
d sin θ = m λ
let's use trigonometry to find the angle
tan θ = y / L
in interference phenomena the angles are small
tan θ= sin θ/ cos θ = sin θ
sin θ = y / L
we subjugate
d y / L = m λ
y = m λ L / d
In this expression we see that the separation of the lines (and) increases linearly with the wavelength, therefore we must use lasers of greater wavelength
Wo siblings are arguing over what way to pull a 10 kg wagon. Boris wants to pull it to the right. Boris puts 220 N of force on the wagon. Natasha wants to pull it to the left. Natasha puts 250 N of force on the wagon. A) What is the net force on the wagon?B) What is the acceleration of the wagon?(Both parts require you to include the direction with your numerical answer.)
Answer:
a) Then net force acting on the wagon 30 [N] in a negative direction to the left
b)Acceleration of the wagon 3 m/s² in a negative direction to the left
Explanation:
The coordinates x and y show the positive direction in x-axis ( to the right) and negative direction to the left. In north-south direction positive y values are to the north and negative values to the south
The free-body diagram shows 4 forces acting
In y-axis:
The weight ( P = m*g = 10 [kg]*9,8 [m/s²] = 98 [N] negative
Normal reaction force Fn = P = 98 [N] positive ( surface is frictionless)
∑Fy = 0 P - Fn = 0 P = Fn = 98 [N]
In x-axis:
Boris pulling force to the right (positive ) 220 [N]
Natasha pulling force to the left ( negative) 250 [N]
∑Fx = m*a
220 [N] - 250 [N] = 10 Kg * a [N] = Kg * m /s²
-30 [kg*m/s²] = 10 * Kg * a
-30/10 = - 3 m/s² = a
Sign (-) means the direction of acceleration vector is to the left (the same direction of the movement )
Then net force acting on the wagon 30 [N] in negative direction to the left
Acceleration of the wagon 3 m/s² in negative direction to the left
A long, straight, horizontal wire located on the equator carries a current (conventional) toward the west. What is the direction of the force on the wire due to the Earth’s magnetic field?
Answer and Explanation: To determine the direction of force, use Right Hand Rule:
Thumb is directed to the current. In this case, to the left;
Palm of the hand towards magnetic field. In this case, since it is Earth's magnetic field, it is pointing towards south;
Then, fingers are in the direction of Force, which is downward.
In conclusion, Force on the wire is directed Downward.
When you look at these spectra you can see different colors (wavelengths) at once. But each atom emits only one wavelength (one photon) at a time. o. Why are multiple wavelengths simultaneously visible
Answer:
Different wavelengths of light also have different frequencies, so the "individual" waves of light are different.
So when you see a given spectra, you are actually watching a superposition of different light waves, and as the waves do not interact that much between them, you can see the different colors.
You can think this similarly as the case with two different sound waves, one high in pitch, and another low.
You can easily identify them, as they do not collide between them.
Now, if you are asking "why the spectrum has different colors".
This is because the levels of energy in each element are different, the outer electrons have weaker bonds, so they will emit photons with less energy (larger wavelength) and so on.
So there are multiple wavelengths because electrons with stronger and weaker bonds are jumping between states at the same time.
For an attic space, there should be an opening to that space _____, and a clear, unobstructed passageway large enough to allow removal of the mechanical appliance.
Answer:
at least 22 inches by 30 inches.
Explanation:
For an attic space, there should be an opening to that space at least 22 inches by 30 inches (22' × 30'), and a clear, unobstructed passageway large enough to allow removal of the mechanical appliance such as an air conditioner unit.
An attic can be defined as a space or room which is found just directly below the roof of a house. An attic is a space that is often used by people to store items. It is also generally being referred to as a garret or sky parlor and sometimes it is called a loft.
According to the 2012 International Residential Code, an attic is required to have an opening space of at least 22 inches wide and 30 inches high.
A solenoid with 35 turns per centimeter carries a current I. An electron moves within the solenoid in a circle that has a radius of 3.0 cm and is perpendicular to the axis of the solenoid. If the speed of the electron is 3.0 ✕ 105 m/s, what is I (in A)?
Answer:
The current of the solenoid is 0.0129 A.
Explanation:
The movement of the electron within the solenoid in a circle is produced by equaling the magnetic force and the centripetal force, as follows:
[tex] F_{B} = F_{c} [/tex]
[tex] e*v \mu_{0}*n*I = \frac{m*v^{2}}{r} [/tex]
[tex] I = \frac{m*v}{e* \mu_{0}*n*r} [/tex]
Where:
I: is the current
m: is the electron's mass = 9.1x10⁺³¹ kg
v: is the electron's speed = 3.0x10⁵ m/s
μ₀: is the permeability magnetic = 4πx10⁻⁷ T.m/A
n: is the number of turns per unit length = 35/cm
r: is the radius of the circle = 3.0 cm
e: is the electron's charge = 1.6x10⁻¹⁹ C
[tex]I = \frac{m*v}{e*\mu_{0}*n*r} = \frac{9.1 \cdot 10^{-31} kg*3.0 \cdot 10^{5} m/s}{1.6 \cdot 10^{-19} C*4\pi \cdot 10^{-7} T.m/A*3500/m*0.03 m} = 0.0129 A[/tex]
Therefore, the current of the solenoid is 0.0129 A.
I hope it helps you!
A proton moves vertically upward and perpendicular to a uniform magnetic field. It deflects to the left as you watch it. What is the magnetic field direction?
Answer:
The magnetic field will be directed away from me into the screen
Explanation:
The force on a positive charge in a magnetic field can be shown by Lorentz right hand rule. If the palm of the left hand is held out with the fingers (representing the field) held parallel to the palm, and the thumb (representing the direction of motion of the positive charge), held perpendicular to the rest of the fingers. The palm will push in the direction of the force on the charge.
Having this in mind, if the thumb points vertically up, with the with the pal facing the left, then the fingers (representing the field) points away from me into the screen.
A tortoise, Bernard, starting at point A travels 12 m west and then 150 millimeters (mm) east. How far west of point A is Bernard after completing these two motions? 80m+145cm+7850mm=X mm . What is X ?
Answer:
1) 11.85 m
2) 89300 mm
Explanation:
1) The tortoise starting from point A travels 12 m west and then 150 millimeters (mm) east.
The distance traveled by the tortoise is the differrence between the distance traveled west and the distance traveled east.
Distance traveled west = 12 m
Distance traveled east = 150 mm
But 1 m = 1000 m, Therefore:
Distance traveled east = 150 mm = 150/1000 m = 0.15 m
Distance west the tortoise is from point A = Distance traveled west - Distance traveled east = 12 - 0.15 = 11.85 m
2) 1 cm = 10 m, 1000 mm = 1 m. Therefore:
[tex]145\ cm = \frac{145\ cm * 10\ mm}{1\ cm} = 1450\ mm[/tex]
[tex]80\ m = \frac{80\ m * 1000 mm}{1\ m} = 80000\ mm[/tex]
X = 80 m+145 cm+7850 mm = 80000 + 1450 + 7850 = 89300 mm
Which statement correctly applied to a spinning mobile that changes its velocity over a period of time?
A. The combination of all forces acting on it is zero.
B. No net force is acting on it
C. Forces are acting on it.
D. A nonzero net force is acting on it.
Answer:
forces are acting on it
Explanation:
when a body is spinning and is changing its velocity per unit, the body is said to be acted upon by forces which causes the spinning.
a body won't change in velocity unless acted by forces.
for a spinning body, a centripetal and centrifugal forces are part of those forces responsible for the spinning car and causes a shift in its velocity.
Two students are watching a person riding a skateboard up and down a ramp. Each student shares what they think about the energy of the skateboarder as they ride up and down the ramp. Elisa: I think the skateboarder has the more total energy at the top of the ramp than the bottom of the ramp. Raymond: I think the skateboarder has the same total energy at all points on the ramp. Which student do you agree with? Why?
Answer:
no
Explanation:
Answer:
Elisa
Explanation:
I I agree with her because when you're at the top of the ramp you are going down and you are going to go down in an exact fast speed so you do have more energy and momentum at the top of the ramp
The bottle's mass is 0.2 kg. The diameter of its base is 10cm. How much pressure does the bottle exert on the table? A) 64 Pa B) 25 Pa C) 6.4 Pa D) 255 Pa
Answer:
B 25pa.................................
A force of 8 N accelerates by 4 m/s^2. What would be the amount of force needed to give a final acceleration of 5.3 m/s^2
Answer:
10.6 N
Explanation:
F = ma
8 = m * 4
m = 2 kg
F = 2 * 5.3
F = 10.6 N