Answer:
B.105
Explanation:
Non-zero digits are always significant.
Zeros between significant digits are also significant.
Trailing zeros are significant only after a decimal point.
0.015 has 2 significant figures.
105 has 3 significant figures.
150 has 2 significant figures.
1.050 has 4 significant figures.
Four metals were kept in contact with each other. The table below shows the initial temperature of the metals.
Metal Initial temperature
A. 30 degrees Celsius
B. 42 degrees Celsius
C. 25 degrees Celsius
D. 16 degrees Celsius
From which metal will heat flow into all the other metals?
O Metal A
O Metal B
O Metal C
O Metal D
Answer:
metal B
temperature flow from high region to low . metal B has more temperature than others
How does work affect energy between objects so it can cause a change in the form of energy?
O Work transfers energy.
O Work changes energy.
O Work increases energy.
O Work decreases energy.
Answer:
Work transfers energy
Explanation:
Work can affect energy by transfering energy between objects to result to a change in the amount and form of energy
PLEASE HELP!! WILL MARK BRAINLEST!!! What are 3 types of waves?
Answer:
transverse waves, longitudinal waves, and surface waves.
You've learned in this unit that you can change aspects of your personality by
A. taking personality tests until they tell you something has changed
B. working hard and being focused on the changes you want to make
C. waiting for your personality to change on its own
D. keeping a consistent routine and always acting in the same ways
Change aspect of personality can occur by working hard and being focused on the changes you want to make.
Personality changeA personality change can occur when an individual learns new habit. This new habit is developed or learnt through habitual responses that have stuck.
Thus, we can conclude that changing your habitual responses over time is one way to create personality change.
The only correct option is, working hard and being focused on the changes you want to make.
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A motivated mule can accelerate an empty cart of mass m - 180 kg from rest to 5.0 m/s in 10 s.
If the cart is loaded with 550 kg of wood, how long will it take the mule to get the cart to 4.6 m/s? Assume a constant acceleration. Also assume the mule exerts the same force as when the cart is
empty
When the mass of the cart changes, the time to travel at 4.6 m/s is 28.11 s.
Acceleration of the mule
The acceleration of mule is calculated as follows;
a = v/t
a = 5/10
a = 0.5 m/s²
For constant applied forceF1 = F2
m₁v₁/t₁ = m₂v₂/t₂
(180 x 5) / 10 = (550 x 4.6)/t
90 = 2530/t
t = 2530/90
t = 28.11 s
Thus, when the mass of the cart changes, the time to travel at 4.6 m/s is 28.11 s.
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When a wire is heated, the current goes down from 0.3A to 0.26A. State how the resistance of the wire has changed
It's very wonderful to help you today!
Answer:
The resistance of the wire after being heated is approximately 1.15 times the resistance before being heated.
Explanation:
The resistance of the wire goes up as the temperature goes up.
By Ohm's law, we have the relationship between the resistance of a conductor R, the current flowing through it, I, and the voltage across it, V,
[tex]V=R~x~I[/tex]
As described, the current through the wire decreases so, to maintain the same voltage, the resistance must increase when the wire is heated. Let's say R1 is the resistance before heating the wire and R2 is the resistance after,
[tex]V=R_{1} x~I_{1} =R_{2}~} x~I_{2}[/tex]
Let's solve for R2,
[tex]R_{2} =\frac{I_{1} }{I_{2} }~x~R_{1}[/tex]
In this case, I1 = 0.3A and I2 = 0.26A,
[tex]R_{2} =\frac{0.3A}{0.26A} ~x~R_{1} =1.15R_{1}[/tex]
Hence, the resistance of the wire after being heated is approximately 1.15 times the resistance before being heated.
If a car stops suddenly, seat belts help stop the motion of the people in the car. Seat belts in cars are usually 47 mm wide.
A team of engineers is designing a car seat to hold a small child. They decide that the straps should be only 38 mm wide. Why do the straps in the car seat not need to be 47 mm wide?
A. A smaller person needs to accelerate less than a larger person.
B. Less force is needed to stop a person that has less mass.
C. A smaller person needs to accelerate more than a larger person.
D. More force is needed to stop a person that has less mass.
plase help
Answer:
B. Less force is needed to stop a person that has less mass.
Explanation:
A circular loop of wire with 15 turns, radius 0.129 m and resistance 0.251 Ohms is connected to a 16.7 V power supply. The magnetic field at the center of this loop is...?
The magnetic field at the center of the circular loop is 3.24 x 10⁻⁴ T.
Current in the wireThe current in the wire is calculated as follows;
V = IR
I = V/R
I = 16.7/0.251
I = 66.53 A
Magnetic field at the center of the loopThe magnetic field at the center of the circular loop is calculated as follows;
[tex]B = \frac{\mu_0 I}{2R} \\\\B = \frac{4\pi \times 10^{-7} \times66.53 }{2\times 0.129} \\\\B = 3.24 \times 10^{-4} \ T[/tex]
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Eva Baul throws a ball upward at 23.4 m/s
Answer:
28 m
Explanation:
v₀ = 23.4 m/s, g = -9.8 m/s²
at the peak v = 0
find h
v² - v₀² = 2gh
0 - 23.4² = 2(-9.8)h = -19.6 h
so h = 28 m
21. A box is at rest at the top of a frictionless inclined plane. As the box slides down the ramp where along the ramp would the box have half of its orginial potential energy?
Halfway down the ramp
When it is at half of its maximum velocity
When it is at half of its total trip time
Answer:
21. A box is at rest at the top of a frictionless inclined plane. As the box slides down the ramp where along the ramp would the box have half of its orginial potential energy?
Halfway down the ramp
When it is at half of its maximum velocity
When it is at half of its total trip time
how to how to how to how
Answer:
Not sure what how to how to how to how means but if you tell me what you need id be happy to help
What is the equivalent resistance of the following combination circuit? A 5.00 Ω resistance placed in series with a parallel combination of 9.00 Ω and 6.00 Ω ?
The equivalent resistance of the circuit is 8.6 Ω.
What is resistance?Resistance can be defined as the opposition to current flow in an electric circuit. The S.I unit of resistance is ohms.
To calculate the equivalent resistance, we use the formula below.
Formula:
R' = R₁+(R₂//R₃)................ Equation 1Where:
R' = Equivalent resistance of the circuit.From the diagram,
Given:
R₁ = 5 .00 ΩR₂ = 9.00 ΩR₃ = 6.00 ΩSubstitute these values into equation 1
R' = 5+(9//6)R' = 5+[(9×6)/(9+6)]R' = 5+[54/15]R' = 5+3.6R' = 8.6 ΩHence, The equivalent resistance of the circuit is 8.6 Ω
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Brainliest if correct Question 4 of 10
Which two changes would decrease the gravitational force between two
objects?
A. Increase the distance between the objects.
B. Decrease the mass of one of the objects.
C. Increase the mass of both objects.
D. Increase the mass of one of the objects.
O E. Decrease the distance between the objects
SUBMIT
Answer:
E is the answer of the question in my opinion
Brainliest if correct Question 7 of 10
When a boy jumps on his bed, his feet push the bed down. What is the
reaction force?
A. The bed pushes his feet up.
B. His gravity pulls up on the bed
C. His gravity pulls up on Earth.
D. The bed pushes down on the ground
SUBMIT
what is the difference between internal and external force
Answer:External forces are forces caused by external agent outside of the system. Internal forces are forces exchanged by the objects in the system.
Explanation:or our purposes, we will simply say that external forces include the applied force, normal force, tension force, friction force, and air resistance force. And for our purposes, the internal forces include the gravity forces, magnetic force, electrical force, and spring force.HOPE THIS HELPS!!! ^w^
You put a new battery into your MP3 player and listen to a song. What are the
energy transformations taking place in this system?
O A. Kinetic energy to electric energy to sound energy to potential
energy
B. Kinetic energy to potential energy to electric energy to sound
energy
C. Thermal energy to electric energy to kinetic energy to potential
energy
D. Chemical energy to electric energy to kinetic energy to sound
energy
Answer:
c
Explanation:because its the correct one
Help me pls, the lesson is simple machines
Answer:
1.pulley,screw,inclined plane
2.using simple machine properly with right way and precautions
Explanation:
3.cuz if they are not used properly they can cause injuries to organs
The first user who answer is correct :)
3. In what circumstance will a flash of lightning travel through the sky and
touch the ground?
Answer: The answer is both. Cloud-to-ground lightning comes from the sky down, but the part you see comes from the ground up. A typical cloud-to-ground flash lowers a path of negative electricity (that we cannot see) towards the ground in a series of spurts.
Explanation:
 State how a ray of light can travel from air into glass without bending?
Answer:
If you shine a beam of light (a bundle of parallel rays) through the air, it will travel in a straight line. Rays of light usually travel in straight lines until they hit something. If a ray of light hits the surface of a sheet of glass, some light will be reflected by the surface of the glass.
Explanation:
STREAM LALISA AND MONEY
Gauss's law combines the electric field over a surface with the area of the surface. From Coulomb's law we know that the electric field falls off as 1/r2 of the distance r from the charge. How does the surface area change with r ?
The change in surface area of Gaussian surface with radius (r) is 8πr.
Electric field from Coulomb's lawThe electric field experienced by a charge is calculated as follows;
[tex]E = \frac{Q}{4\pi \varepsilon_o r^2}[/tex]
where;
E is the electric fieldQ is the charger is the radiusThe electric field reduces by a factor of [tex]\frac{1}{r^2}[/tex]
Surface area of a Gaussian surface;The surface area of a sphere is given as;
[tex]A = 4\pi r^2[/tex]
Change in area with r[tex]\frac{dA}{dr} = 8\pi r[/tex]
Thus, the change in surface area of Gaussian surface with radius (r) is 8πr.
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Earth what on its axis from what to what approximately every what
Could someone help me
What means what should I put in there
Answer:
Earth rotates on its axis from west to east approximately every 24 hours
Explanation:
hope this helps :)
Brainliest if correct
Answer:
B 1,3, and 4
Explanation:
005 10.0 points
A football punter accelerates a 0.52 kg football
from rest to a speed of 8.6 m/s in 0.27 s. What
constant force does the punter exert on the ball?
Answer in units of N.
Answer:
16.6 N
Explanation:
m = 0.52 kg, v₀ = 0, v = 8.6 m/s, t = 0.27 s
a = (v - v₀)/t
F = ma = m(v - v₀)/t = 0.52 (8.6 - 0)/0.27 = 16.6 N
1. What does the vertical axis represent on a position-time graph?
A. Speed of the object
B. Position of the object
C. Velocity of the object
D. Total time travelled by the object
2. What do you call a graph that is plotted in terms of the distance travelled by the
object and the time it took to cover that distance?
A. Speed-time graph
B. Position-time graph
C. Distance-time graph
D. Displacement-time graph
3. Which is TRUE about displacement?
A. How fast an object is moving
B. Change in position in a given time
C. Length of the entire path that an object travelled
D. Shortest distance between the object’s two positions
4. What does a horizontal line in the distance-time graph indicate?
A. No movement
B. Constant speed
C. Object is accelerating
D. Object is decelerating
5. When looking at a displacement-time graph, what variable should be plotted on the
y-axis and x-axis?
A. Y-axis: Time; X-axis: Distance
B. X-axis: Time; Y-axis: Distance
C. X-axis: Time; Y-axis: Displacement
D. Y-axis: Time; X-axis: Displacement
6. Which of the following illustrates acceleration?
A. Constant velocity
B. Changing direction
C. The direction does not change
D. The speed and direction remains the same
7. The following are correctly matched, EXCEPT
A. Speed: Scalar
B. Velocity: Vector
C. Distance: Scalar
D. Displacement: Scalar
What I Know
3 CO_Q3_Science 7_ Module 2
8. What does a line on a graph that is curving upwards mean in a distance-time graph?
A. The object is not moving.
B. The object has a constant speed.
C. The speed of the object is increasing.
D. The speed of the object is decreasing.
9. The following units can be used to mathematically express speed, EXCEPT
A. m
B. m/s
C. km/hr
D. miles/hr
10. Ethan is playing with his toy car. While watching him, you observed that the toy
car is accelerating. Which of the following graphs show that the toy car is
accelerating?
A B C D
11. Examine the given graph. What conclusion can you make from this graph?
A. The object is stationary.
B. The object is decelerating.
C. The object’s acceleration is increasing.
D. The object is moving at a constant speed.
For items 12-13, refer to the given figure below.
12. What does the part B of the displacement-time graph tell us about the object?
A. The object has a velocity of 2 m/s.
B. The object is not moving for 2 seconds.
C. The object travels 2 meters in 2 seconds.
D.The object travels 2 meters in 2 seconds backs to its starting position.
4 CO_Q3_Science 7_ Module 2
13. What conclusion can you make about the motion of the object after it travels from
point A to point C?
A. I and II only
B. II and III only
C. I and IV only
D. II, III, and IV only
14. Examine the graph below. Is it correct to say that the straight horizontal line on the
speed-time graph means that the object is not moving?
A. Yes, a horizontal line means that the object is at rest or stationary.
B. Yes, a straight line always means that an object is not moving at all.
C. No, a horizontal line indicates that the object has uniform acceleration.
D. No, a horizontal line indicates that the speed is not changing over time.
15. During their science class, Jessa was assigned to discuss about distance-time
graphs. In one of her graphs, Jessa shows a graph with a diagonal line that slopes
upward to the right. She explained that the graph means that an object is moving
at a constant speed. Do you think her explanation is correct?
A. No, the distance-time graph should show a horizontal straight line going to
the right.
B. No, a diagonal line that slopes upward to the right in a distance-time graph
means that the speed is increasing.
C. Yes, the motion of objects plotted in a distance-time graph has similar
interpretation if plotted in a speed-time graph.
D. Yes, a diagonal line that slopes upward to the right means that distance is
increasing constantly with time, thus an object is moving in a steady speed.
Answer:
1. Option B
2. Option C
3. Option D
4. Option C
5. Option C
Explanation:
Given the following questions:
Question one:
Your answer is option B, a position time graph is one of the most common graphs to use to describe the motion of objects. The vertical line of the position time graph is the line that would be the y axis in some math cases. This line represents the "position of the object" or option B.
Question Two:
Your answer is option C or a "distance-time graph." The vertical axis shows the distance travels, while the horizontal line shows the time the object spends in the air. Distance-time graphs are used to show the distance an object traveled, in a certain amount of time.
Question three:
Your answer is option D or "shortest distance between two positions." Displacements definition is purely moving something from its initial position. Displacement is also seen as length and distance, which is why the shortest distance between two positions would be considered as true when it comes to displacement.
Question four:
Horizontal line would be the x-axis on a normal coordinate plane, since this is a distance-time graph and the horizonal line represents time. The answer will be option C or "object is accelerating." Since a distance-time graph shows how far an object goes in a certain amount of time, the horizontal line shows how fast the object is moving while traveling that distance within that certain amount of time.
Question five:
Your answer is option C or "X-axis: Time; Y-axis: Displacement." Since we are talking about a displacement-time graph, Y-axis is the dependent variable, it is what's being measured, so that would be displacement. While x-axis is the independent variable, which is what is being tested, so the x-axis will be time.
Hope this helps.
The default unit of rotational speed is 'radians per second' or 'rad/s'. If a someone sits at the edge of a 5m radius carousel and has tangential speed of 2 m/s, what is the rotational speed in rad/s?
A. 2.5
B. 3
C. 7
D. 10
The rotational speed of the person is 0.4 rad/s.
Rotational speed (rad/s)
The rotational speed of the person in radian per second is calculated as follows;
v = ωr
where;
v is linear speed in m/sr is radius in metersω is speed in rad/sω = v/r
ω = 2/5
ω = 0.4 rad/s
Thus, the rotational speed of the person is 0.4 rad/s.
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What is the operating life time of a PV Module?
Answer:
The industry standard life span is about 25 to 30 years, and that means that some panels installed at the early end of the current boom aren't long from being retired is the operating life time of a PV module .
(12 points, suggested time 25 minutes)
A block of mass me can be attached to a parachute of negligible mass and radius T, as shown in the two views
above. When falling, the parachute experiences an upward force of air resistance. This force increases as the speed
of the parachute increases. The falling block and parachute
speed up at first but eventually reach a constant speed
called terminal speed
(a) The dot below represents the block-parachute system when it has reached its terminal speed and is falling at
this constant speed. On the dot, draw and label the forces (not components) acting on the system. Represent each
force by a distinct arrow starting on, and pointing away from the dot.
Note: Draw the relative lengths of all vectors to reflect the relative magnitudes of all the forces.
Answer:
Explanation:
Please follow the directions here and draw out the answer yourself.
Draw two arrows of the same length. Both start on the dot but one points up and the other points down.
Label the up arrow as "Air resistance" and the down arrow as "Weight, Me*g". Make sure the two arrows have the same length and are directly opposite each other.
The free-response to the question based on the given diagram is:
Draw two arrows of the same length. Both start on the dot but one points up and the other points down.Label the up arrow as "Air resistance" and the down arrow as "Weight, Me*g". Make sure the two arrows have the same length and are directly opposite each other.What is a Parachute?This refers to the apparatus or equipment that is used to help a person to descend slowly from a high altitude.
Hence, given that a block of mass is attached to a parachute and while descending, it encounters air resistance, then to show the relative length of all vectors:
Two arrows of the same length needs to be drawn.One of them points in an upwards direction.The other points in the downwards direction.The arrow pointing upwards would be labeled as "Air Resistance", the other would be labeled as "Weight" and they are opposite each other.Read more about air resistance here:
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If runner A is running at 7.50 m/s and runner B is running at 7.90 m/s, how long will it take runner B to catch runner A if runner A has a
55.0-m head start?
Answer:
t= 137.5 s
Explanation:
So if we are wanting to figure out how long it takes runner B to catch runner A. we must first set the slope of each runner equal to one another
Slopes:
Runner A: y = 7.50x + 55
Runner B: y = 7.90 x
sooooo
7.50 x + 55 = 7.90 x
- 7.50 x - 7.50 x
55 = .40 x
55/.40 = .40 x / .40
x = 137.5 s
t= 137.5 s
7.50 * 137.5 + 55 =1086.25 m
7.90 * 137.5 = 1086.25 m
Runner B will catch Runner A after approximately 44.00 seconds.
To determine the time it takes for Runner B to catch Runner A, we need to consider their relative speeds and the initial distance between them.
Runner B is running faster than Runner A, so the distance between them will decrease over time. The relative speed of Runner B with respect to Runner A is the difference in their speeds:
Relative speed = Speed of Runner B - Speed of Runner A
Relative speed = 7.90 m/s - 7.50 m/s = 0.40 m/s.
Runner B needs to cover the initial distance (head start) of 55.0 meters between them. The time it takes for Runner B to catch up to Runner A can be calculated using the formula:
Time = Distance / Relative Speed.
Time = 55.0 m / 0.40 m/s = 137.5 seconds.
However, this time includes the time taken by Runner A to run the initial distance. To find the time taken by Runner B to catch Runner A after accounting for the head start, we subtract the initial time from the total time:
Time taken by Runner B = Total time - Time taken by Runner A.
Runner A's initial time = Distance / Speed = 55.0 m / 7.50 m/s = 7.3333 seconds.
Time taken by Runner B = 137.5 seconds - 7.3333 seconds = 130.1667 seconds.
Rounded to two decimal places, it takes Runner B approximately 130.17 seconds to catch up to Runner A.
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#SPJ3
What is one limitation of using renewable
resources for electrical energy?
A. The output of energy they produce is not always consistent.
B. They can be easily replaced.
C. They produce less pollution.
D. They produce a large amount of energy.
Jennifer is walking at 1.63 m\s. If Jennifer weighs 583 N, what is the magnitude of her momentum?
Given that Jennifer is walking at 1.63 m/s and her weight is 583 N. Therefore, the magnitude of her momentum is 96.97 Kg•m/s
How to determine Jennifer's mass Weight (W) = 583 NAcceleration due to gravity (g) = 9.8 m/s²Mass (m) =?
m = W / g
m = 583 / 9.8
m = 59.49 Kg
How to determine Jennifer's momentum Mass = 59.49 KgVelocity = 1.63 m/sMomentum =?Momentum = mass × velocity
Momentum = 59.49 × 1.63
Momentum = 96.97 Kg•m/s
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