Answer:
The answer is 631.157
Explanation:
The question requested that the answer to the subtraction of 26.543 from 657.70 must be written using significant figures.
Here are a few tips about how to Identify significant figures.
1) It should be noted that the number "0" is what is usually (but not always) affected while trying to identify significant figures. Hence, all other numbers/digits are always significant. For example, 26.543 has five significant figures.
2) The zeros found between these "other numbers/digits" are also significant. For example, 2202 has four significant figures.
3) In the case of a decimal, the tailing zeros or the final zero is also significant. 657.70 and 657.07 have five significant figures.
Now, back to the question
657.70 - 26.543 = 631.157.
Our final answer does not have a zero, hence all the digits (six) are significant.
A track and field athlete is running forward with a javelin at a
velocity of 4.2 m/s. If he throws the javelin at a velocity relative
to him of 10.3 m/s, what is the velocity of the javelin relative to the ground?
Please help
Explanation:
The relative velocity is the velocity of the athlete relative to the ground plus the velocity of the javelin relative to the athlete.
v = 4.2 m/s + 10.3 m/s
v = 14.5 m/s
The relative velocity of the javelin relative to the ground be 14.5 m/s.
What is velocity?The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.
Given parameters:
Velocity of the athlete: u = 4.2 m/s
Velocity of the javelin related to him: v = 10.3 m/s.
The relative velocity of the javelin relative to the ground is the velocity of the athlete relative to the ground plus the velocity of the javelin relative to the athlete.
So, The relative velocity of the javelin relative to the ground is:
V = 4.2 m/s+ 10.3 m/s
⇒ V= 14.5 m/s
Hence, the relative velocity of the javelin relative to the ground be 14.5 m/s.
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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.
A blue train of mass 50 kg moves at 4 m/s toward a green train of 30 kg initially at rest. The trains collide. After the collision the green train moves with a speed of 3 m/s. What is the final momentum of the green train? A. 90 kgm/s B. 20 kgm/s C. 200 kgm/s D. 110 kgm/s
Explanation:
Momentum = mass × speed
p = (30 kg) (3 m/s)
p = 90 kg m/s
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
A 10 gram ball is rolling at 3 m/s. The ball has __________ energy. Calculate it. A 10 gram ball is held 2 meters from the ground. It has __________ energy. Calculate it. You serve a volleyball with a mass of 2100 g. The ball leaves your hand with a velocity of 30 m/s. The ball has ____________ energy. Calculate it. A toy baby carriage is sitting at the top of a hill that is 21 m high. The carriage with the baby has a mass of 200 grams . The carriage has ____________ energy. Calculate it. A toy car is traveling with a velocity of 4 m/s and has a mass of 1120 g. The car has ___________energy. Calculate it. A cinder block is sitting on a platform 20 m high. It has a mass of 790 grams. The block has _____________ energy. Calculate it. There is a bell at the top of a tower that is 5 m high. The bell has a mass of 190 grams. The bell has ____________ energy. Calculate it. A toy roller coaster is at the top of a 2 m hill and has a mass of 9660 grams. The coaster (at this moment) has ____________ energy. Calculate it.
Answer:
a) KINETIC ENERGY K = 0.045 J , b) POTENTIAL ENERGY U = 0.196 J ,
c) KINETIC ENERGY K = 9.45 10⁵ J, d) POTENTIAL ENERGY , U = 41.16 J ,
e) POTENTIAL ENERGY U = 154.84 J , f) ENERGY IS POTENTIAL U = 9.31 J
g) energy is POTENTIAL U = 189.336 J
Explanation:
a) The ball is moving with a speed, so it has KINETIC ENERGY
K = ½ m v²
K = ½ 10 10⁻³ 3²
K = 0.045 J
b) The ball is at a given height therefore it has POTENTIAL GRAVITATORY ENERGY
U = m g y
U = 10 10-3 9.8 2
U = 0.196 J
c) The ball has speed so it has KINETIC ENERGY
K = ½ m v²
K = ½ 2,100 30²
K = 9.45 10⁵ J
d) The baby carriage is at a height whereby the POTENTIAL ENERGY
U = mg h
U = 0.200 9.8 21
U = 41.16 J
e) the concrete block is at a height that has POTENTIAL ENERGY
U = m g h
U = 0.790 9.8 20
U = 154.84 J
f) the hood has height, the ENERGY IS POTENTIAL
U = 0.190 9.8 5
U = 9.31 J
g) The roller coaster has height and speed, therefore the mechanical energy has a scientific part and a potential part, in general the speed at the top of the mountain is very small, so we can consider that almost all the energy is POTENTIAL
The value they give allows calculating the potential energy
U = 9.660 9.8 2
U = 189.336 J
The answer to all the questions on potential energy and kinetic energy have been done below;
A) We are told that the ball is rolling. An object in motion has kinetic energy. Formula for kinetic energy is;
K = ½mv²
We have; m = 10 g = 0.01 kg and v = 3 m/s
K = ½ × 0.01 × 3²
K = 0.045 J
B) We are told that the ball is held at a height. This means it is at rest and any object at rest has Potential Energy. Formula for potential energy is;
PE = mgh
We have; m = 10g = 0.01 kg and h = 2 m
PE = 0.01 × 9.8 × 2
PE = 0.196 J
C) Like in A above, the ball is in motion. Thus, it has kinetic energy.
K = ½ × 2.1 × 30²
K = 945 J
D) The baby carriage is sitting at rest and therefore has potential energy.
PE = 0.2 × 9.8 × 21
PE = 41.16 J
E) The toy car is in motion and has kinetic energy. Thus;
K = ½ × 1.12 × 4²
K = 8.96 J
F) The cinder block is sitting at rest and has potential energy. Thus;
PE = 0.79 × 9.8 × 20
PE = 154.84 J
G) The bell is at the top of the tower and is at rest and thus has potential energy.
PE = 0.19 × 9.8 × 5
PE = 9.31 J
g) The rollercoaster is at the top at rest and so has potential energy.
PE = 9.66 × 9.8 × 2
PE = 189.336 J
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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
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
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
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
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
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:
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.
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:
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.
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
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 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
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.
If the angle of reflection of a propagated ray is 35°. Calculate the a. Angle of incidence b. Angle of deviation c. Angle of glance
[tex] \LARGE{ \underline{ \blue{ \tt{Required \: answers}}}}[/tex]
First of all,
Angle of incidence = Angle between normal and incident ray.Angle of reflection = Angle between normal and reflected rayGlance angle of incidence = Angle between incident ray and the surface.Glance angle of reflection = Angle between reflected ray and the surface.We have,
➝ Angle of reflection = 35°
(a) According to law of reflection,
Angle of incidence = Angle of reflection
➝ Angle of incidence = 35°
(b) By using formula,
Angle of Deviation = 180° - 2(Angle of incidence)
From (a),
➝ Angle of Deviation = 180° - 2(35°)
➝ Angle of Deviation = 180° - 70°
➝ Angle of Deviation = 110°
(c) We know,
Angle of Incidence + Glance angle of incidence = 90°
Angle of reflection + Glance angle of reflection = 90°
So,
As angle of incidence = angle of reflection
Then, Angle of glance is also equal.
➝ Angle of glance = 90° - 35° = 55°
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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.
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.
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:
Question 5 At 12:00 pm, a spaceship is at position ⎡⎣324⎤⎦ km ⎣ ⎢ ⎡ 3 2 4 ⎦ ⎥ ⎤ km away from the origin with respect to some 3 dimensional coordinate system. The ship is travelling with velocity ⎡⎣−12−3⎤⎦ km/h ⎣ ⎢ ⎡ −1 2 −3 ⎦ ⎥ ⎤ km/h What is the location of the spaceship after 2 hours have passed
Answer:
[1, 6, -2]
Explanation:
Given the following :
Initial Position of spaceship : [3 2 4] km
Velocity of spaceship : [-1 2 - 3] km/hr
Location of ship after two hours have passed :
Distance moved by spaceship :
Velocity × time
[-1 2 -3] × 2 = [-2 4 -6]
Location of ship after two hours :
Initial position + distance moved
[3 2 4] + [-2 4 -6] = [3 + (-2)], [2 + 4], [4 + (-6)]
= [3-2, 2+4, 4-6] = [1, 6, -2]
The location of the spaceship after 2 hours have passed is [1, 6, -2]
Calculation of the location:Since
Initial Position of spaceship : [3 2 4] km
Velocity of spaceship : [-1 2 - 3] km/hr
Now
Location of the ship after two hours should have passed
So,
Distance moved by spaceship should be
= Velocity × time
= [-1 2 -3] × 2
= [-2 4 -6]
Now
Location of ship after two hours should be
= Initial position + distance moved
= [3 2 4] + [-2 4 -6]
= [3 + (-2)], [2 + 4], [4 + (-6)]
= [3-2, 2+4, 4-6]
= [1, 6, -2]
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What is the kinetic energy of a 3 kg ball that is rolling at 3 m/s?
Answer:
[tex]\Huge \boxed{\mathrm{13.5 \ Joules}}[/tex]
Explanation:
[tex]\sf Kinetic \ energy \ (J)=\frac{1}{2} \cdot mass \ (kg) \cdot (velocity \ (m/s)) ^2[/tex]
[tex]\mathrm{KE=\frac{1}{2} mv^2}[/tex]
The mass of the ball is 3 kg.
The velocity of the ball rolling is 3 m/s.
[tex]\mathrm{KE=\frac{1}{2} \cdot 3 \cdot 3^2}[/tex]
Evaluating and solving for kinetic energy.
[tex]\mathrm{KE=\frac{1}{2} \cdot 3 \cdot 9}[/tex]
[tex]\mathrm{KE=\frac{1}{2} \cdot 27}[/tex]
[tex]\mathrm{KE} =13.5[/tex]
The kinetic energy of the ball is 13.5 Joules.
Answer:
Kinetic energy =1/2mv^2.
1/2×3×3^2.
1/2×27=13.5 or 13 whole number 1/2.
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.
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:
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:
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
A man, holding a weight in each hand, stands at the center of a horizontal frictionless rotating turntable. The effect of the weights is to double the rotational inertia of the system. As he is rotating, the man opens his hands and drops the two weights. They fall outside the turntable. Then:
Answer:
w = 2w₀ the angular velocity of man doubles
Explanation:
In this exercise, releasing the weights reduces the moment of inertia
I= I₀ / 2
Therefore, since the platform system plus man is isolated, the kinetic moment must be conserved
L₀ = L
I₀ w₀ = I w
I₀ w₀ = I₀ / 2 w
w = 2w₀
therefore the angular velocity of man doubles