Answer: 2
Explanation:
The statement "All magnets pick up paperclips, but the number of paperclips depends on the magnet" is neither a hypothesis nor testable.
The hypothesis that is not testable based on the given data is magnets will pick up metal objects but not plastic objects. Option C is the correct answer.
The reason this hypothesis is not testable based on the given data is that the information provided only pertains to the number of paperclips picked up by different magnets. It does not provide any information or evidence regarding the ability of magnets to pick up metal objects versus plastic objects. Option C is the correct answer.
In order to test this hypothesis, we would need data or experiments specifically focusing on the interaction between magnets and metal objects as well as magnets and plastic objects. The given data only provides information about the number of paperclips picked up by different magnets, which does not support or refute the hypothesis about the ability of magnets to pick up different materials.
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Item 3
What causes an electric current in a wire?
Electrons flow because of electrical attraction and repulsion.
Electric fields cause atoms to move in the wire.
Electrons build up in the wire and create a charge.
Electrons move because of heat.
Answer:
A
Explanation:
The definition of current is the differential change in charge over a differential change in time. In the case of the wire, a source, say a battery, sends electrons from one terminal to another terminal. The medium through which these electrons move is the wire. Therefore, the charge flowing through the wire over time creates an electric current, by definition.
When travelling through a vacuum, which of the following is correct?
Radio waves travel faster than gamma rays
Gamma rays travel faster than radio waves
Both Gamma rays and Radio waves travel at the same speed
Radio waves do not travel through a vacuum
Both Gamma rays and Radio waves travel at the same speed when placed in a vacuum.
What are Electromagnetic waves?This is the type of wave of electric and magnetic fields propagating at the speed of light through empty spaces.
All electromagnetic waves such as Gamma rays and Radio waves travel at the same speed which is why option C was chosen.
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Which object is the light most likely striking? a window a mirror a plaster wall a steel beam
Answer:
Explanation:
window!
The light most likely strikes on a window.
What is meant by refraction?Refraction of light is defined as the bending of light when it travels from one medium to another.
Here,
When light falls on a smooth, reflecting surfaces like glass, mirror, water, it gets bounced back. This is known as the reflection of light.
But when a light ray strikes on the surface like, a window, the light will get refracted and as a result, when it passes through the glass, the path of the light is changed.
The light undergoes refraction twice, as the light enters and gets escaped from the window.
Hence,
The light most likely strikes on a window.
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A warehouse has a pulley system to move stuff. A technician uses the pulley to lift a 500.0 kg box of material from floor to the top shelf, 3.50 m up. The force on the chain is 10 000. N applied through a distance of 4.50 m. What is the efficiency of the pulley?
Answer: 38% efficiency
Explanation:
Given:
- Mass of box, 500.0kg
- Height lifted, 3.50m
- Force Applied, 10 000N
- Distance applied, 4.50m
Required:
% Efficiency, can be found through formula η = [useful energy output (Eout) ÷ energy input (Ein)] x100%
To calculate Eout, you need to find which energy transferred to the box is useful. In this case, it is the gravitional potential energy, which can be found by the formula Eg = mgh, where Eg = (500.0)(9.8)(3.50) = 17150J.
To calculate Ein, find the total energy that was inputted to the object, given by W = FΔd, where W = 45000J.
Now, plug in the values to the %eff formula:
(17150J ÷ 45000J) x100% ≈ 38%
Therefore % efficiency of the pulley is 38%.
Which of the following solutions have a concentration of 0.11 g/mL?
Explanation:
Which of the following solutions have a concentration of 0.11 g/mL?
Answer:
22 g of acetic acid in 200 mL of water
Explanation:
22g/200mL = 0.11 g/mL
newton’s laws 8th grade science
Answer:
hB djJS E DIS SIS. AHA. SDI DVZ SIS.Zsjsnw
Most active galactic nuclei are found at large distances from us, with relatively few nearby. What does this imply?.
It implies that the universe is expanding, and so is the fabric of space-time.
Think of a balloon with stickers on it.
As you blow the balloon bigger and bigger, the stickers will get further apart!
A puck moves 2.35 m/s in a -22 degree direction. A hockey stick pushes it for 0.215 s, changing its velocity to 6.42 m/s in a 50 degree direction. What is the magnitude of acceleration
For a puck moves 2.35 m/s in a -22 degree direction. A hockey stick pushes it for 0.215 s, changing its velocity to 6.42 m/s in a 50 degree direction the magnitude of the acceleration is mathematically given as
θ=71.4
What is the magnitude of acceleration?
Generally, the equation for the initial velocity of the puck is mathematically given as
v1=v1cosαi+v1sinαj
v1=(2.35)cos(−22.0)i+(2.35m)sin(−22.0)j
v1=2.1788820582i−0.8803254945j
v2=(6.42)cos(50.0)i+(6.42)sin(50.0)j
v2=4.1266964542i+4.9180053248j
hence,
a=v2−v1/Δt
[tex]a=(4.1266964542i+4.9180053248j) - (2.1788820582i-0.8803254945j)/0.215s[/tex]
a= 9.0596018419i+26.968980555j
In conclusion, the magnitude of acceleration
θ=tan−1(26.968980555/9.0596018419)
θ=71.431423019
θ=71.4
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Answer the following question in 3-4 complete sentences. a sculpture of a man sitting with his legs crossed, feet facing up. one hand is raised beside the shoulder, palm out. the other is placed on the knee. two smaller figures stand behind the seated man and two smaller figures float above him. name and describe the sculpture above. what school of thought is this sculpture a part of?
Answer:
see explanation
Explanation:
This sculpture is entitled, Buddha and Attendents. It was made of sandstone flecked with cream-colored spots. Buddha's right hand is raised in a gesture meaning "have no fear". This sculpture is from the Mathura school of thought.
sample response 3dge22
Answer:
This sculpture is entitled, Buddha and Attendents. It was made of sandstone flecked with cream-colored spots. Buddha’s right hand is raised in a gesture meaning ”have no fear”. This sculpture is from the Mathura school of thought.
Explanation:
picture
At a bicycle repair shop, a bicycle tire of mass M and radius R is suspended from a peg on the wall. The moment of inertia of the tire around the peg is 2MR2 . If the tire is displaced from equilibrium and starts swinging back and forth, what will be its frequency of oscillation
The frequency of oscillation given the moment of inertia of the tire around the peg will be f = 1/2π✓(g/2R).
How to calculate the frequency of oscillation?Given I = 2MR²
Torque = Mgsin(theta)R
Here, w = 2πf.
f = 1/2π✓(MgR/I)
f = 1/2π✓(MgR/2MR²)
f = 1/2π(✓g/2R)
Therefore, the frequency of oscillation is f = 1/2π(✓g/2R).
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Why does an aqueous solution of an ionic substance conduct an electric current?.
Answer: Because ions in an aqueous solution are free to move independently from each other. the net flow of cations toward a negative or positive electrode results in a flow of charge, which is an electrical current.
Which of the following distinguishes light waves from mechanical waves?
A. Light waves are not really waves, they are streams of fast moving particles.
B. Light waves carry much more energy than mechanical waves.
C. Light waves cannot be reflected or refracted.
D. Light waves can carry energy through empty space.
Answer:
Im pretty sure it's B. but im not 100% sure sry
Explanation:
50pts Each
In order to differentiate between speed, displacement, and acceleration, a physical science student models the three terms using a toy car. The car is rolled forward 20 meters, turns around, and is rolled back to the starting point (another 20 meters) in 10 seconds.
A) The acceleration occurred when the car changed direction.
B) The speed was forty meters in 10 seconds, or 4 meters per second.
C) The speed was zero, since the object had no overall displacement.
D) The velocity was forty meters in 10 seconds, or 4 meters per second.
E) The velocity was zero, since the object returned to its original location with zero displacement.
Answer:
D
Explanation:
D) The velocity was forty meters in 10 seconds, or 4 meters per second.
The nuclide cobalt-60 has 27 neutrons, 33 protons, and a nuclear mass of 59. 933820 u.
Calculate the mass of the separate nucleons using the following information:
Mass of Proton: 1. 007825 u
Mass of Neutron: 1. 008665 u
1 u = 931. 5 MeV
59. 933820 u
02. 01649 u
O 60. 492184
520. 11 u
From the information provided in the question, the total mass of the nucleons is 60.49218 u.
What are nucleons?The term nucleons refers to both the neutrons and the protons that are found in the nucleus of atoms. We have the following information;
Mass of Proton: 1. 007825 u
Mass of Neutron: 1. 008665 u
Mass of 27 neutrons = 27(1. 008665 u) = 27.233955
Mass of 33 protons = 33(1. 007825 u) = 33.258225
Total mass of nucleons = 27.233955 + 33.258225 = 60.49218 u
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Which type of energy does a ball thrown in the air have at its highest point?.
Answer:
Potential Energy
Explanation:
Potential Energy is the required answer
1. A positively charged object with a charge of +85 nC is being used to balance the downward force of gravity on a 1.8-gram balloon that has a charge of -63 nC. How high above the balloon must the object be held to balance the balloon?
The distance above the balloon that the positively charged object must be held to balance the balloon is 5.2 cm.
Force between the charges
The force between the charges is determined by applying Coulomb's law.
F = kq₁q₂/r²
Downward force of gravityThe downward force of gravity of the balloon is given as;
F = mg
When the two forces balances, the distance between the charges is calculated as follows;
[tex]mg = \frac{kq_1q_2}{r^2} \\\\r^2 = \frac{kq_1q_2}{mg} \\\\r = \sqrt{\frac{kq_1q_2}{mg} } \\\\r= \sqrt{\frac{(9\times 10^9)(85 \times 10^{-9})(63\times 10^{-9})}{(1.8 \times 10^{-3} \times 9.8)} } \\\\r = 0.052 \ m\\\\r = 5.2 \ cm[/tex]
Thus, the distance above the balloon that the positively charged object must be held to balance the balloon is 5.2 cm.
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How long the fundamental frequency and harmonic remain at their peak loudness until they start to disappear is known as ______ and is a feature of ______.
Answer:
The answer is decay; timbre.
Explanation:
How long the fundamental frequency and harmonic remain at their peak loudness until they start to disappear is known as decay and is a feature of timbre.
Describe the overall trends you see in the employment graph. give your answer in the form of at least two complete sentences.
Answer:
The graph demonstrates two major trends. First, employment numbers began to drop sharply in 2008. These numbers fell until 2010, when they reached a trough. Employment began to rise again after this point and continued to rise into 2013.
Explanation:
can you get very smart?
Actually according to physics there should be needed a force to move things but our mind does not produce a force ...Apart from myths ...is seems quite impossible to move a object with ur mind
-Thanks for reading
can anyone please solve this question for me i will give you 100 points please
Answer:
initial velocity= v(1 - 1/(1 + (pi)r^2dp(m/M) )
Explanation:
1st: Write the equation initial velocity=v( 1 - 1/(1 + pi x r^2 x d x p x m/M)
Secondly: Plug in the variables initial velocity= v( 1 - 1/(1 + (pi)r^2dp(m/M) )
You need to give me the variable amounts to find the initial velocity.
Any measurement that includes both magnitude and direction is called an
Answer:
Vector Quantity
Explanation:
i dont know how to explain it my g
What’s the difference between expressed/implied powers, concurrent powers, and reserved powers?.
Answer:
A reserved power is a power specifically reserved to the states. Powers include setting up local governments and determining the speed limit. A concurrent power is a power that is given to both the states and the federal government.
Explanation:
How or when does Harley Quinn demonstrate or defy the law of physics? Is there a scene where she demonstrates/defies the laws of physics? Do her abilities defy/demonstrate the law of physics?
Harley Quinn uses her baseball bat with 100% efficiency which defies the law of physics as no tool is 100% efficient.
Who is Harley Quinn?Harley Quinn is a villain in the comics as well as the adapted movie suic_ide squad.
Harley Quinn's choice weapon is a mallet which she later loses for a baseball bat during a fight she got in.
Harley Quinn does not possess any superpowers, but she uses her bat so well that it defies some of the laws of physics.
For example, no tool or machine is 100% efficient, yet Harley Quinn uses her bat with 100% efficiency, thus defying the law of physics.
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The measured value of mass M in an experiment is M = 0.743 ± 0.005kg. The error in 2M is
When the measured value of mass M becomes 2 M, the error in the measurement will be 0.00995 kg.
Percentage error
The percentage error is determined from the ratio of the error in meaurement to actual measurement.
Percentage error = (error / measurement) x 100%
Percentage error = (0.005 / 0.743) x 100%
Percentage error = 0.67%
When the mass becomes 2MNew mass = 2 x 0.743
New mass = 1.486 kg
Error in measurement0.67 = (new error / 1.486) x 100%
0.0067 = new error / 1.486
new error = 0.0067 x 1.486
new error = 0.00995 kg
Thus, when the measured value of mass M becomes 2 M, the error in the measurement will be 0.00995 kg.
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a car accelerates from 20 m/s to 40 m/s in 10 s and its forward thrust is equal to 3 kN, what is the mass of
A car that has a forward thrust of 3kN and accelerates from 20 m/s to 40 m/s in 10 s has a mass of 1500 kg. Thus, the mass of the car is the 1500 kg
Newton's 2nd law of motionFrom the question, we are to calculate the mass of the car.
From Newton's second law of motion, we have that
F = ma
Where F is the Net force
m is the mass
and a is the acceleration
Also, from one of the equations of linear motion, we have that
v = u + at
Then, we can write that
[tex]a = \frac{v-u}{t}[/tex]
Where v is the final velocity
u is the initial velocity
a is the acceleration
and t is the time taken
Therefore,
[tex]F = m\frac{(v-u)}{t}[/tex]
From the given information,
u = 20 m/s
v = 40 m/s
t = 10 s
F = 3 kN = 3000 N
Putting the parameters into the equation, we get
[tex]3000 = m \frac{(40-20)}{10}[/tex]
[tex]3000 = m \times \frac{20}{10}[/tex]
3000 = 2m
Then,
m = 3000 ÷ 2
m = 1500 kg
Hence, the mass of the car is the 1500 kg.
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Exercise: How long must a 1500 N force act on a car to give it a momentum of 56 000 kg-m/s starting from rest?
Question:
How long must a 1500 N force act on a car to give it a momentum of 56000 kg-m/s starting from rest?
Find out key variables:
Force: 1500 N
Momentum: 56,000 kg-m/s
Recall the formula: ΔMomentum (kg m/s) = Force (N) x Time Taken (s)
Solve:
56,000 = 1500 x time taken
time taken = 56,000/1500
time taken = 112/3
time taken = 37.33 seconds
A boy skips a rock so that it bounces off the water with a velocity of 3. 5m/s at 40. 0 degrees. How long will it take to hit the water again?
Since the rock has a velocity of 3.5m/s at 40.0°, it will take the rock 0.46 s to hit the water again.
Since the rock is a projectile, we use the time of flight of a projectile to find the time it hits the water again
Time of flight of projectile.The time of flight of the rock is given by T = 2UsinФ/g where
u = velocity of stone = 3.5 m/s, Ф = angle of projection = 40.0° and g = acceleration due to gravity = 9.8 m/s².Substituting the values of the variables into the equation, we have
T = 2UsinФ/g
T = 2 × 3.5 m/s × sin40.0°/9.8 m/s².
T = 7.0 m/s × 0.6428/9.8 m/s².
T = 4.4995 m/s ÷ 9.8 m/s²
T = 0.459 s
T ≅ 0.46 s
So, it will take the rock 0.46 s to hit the water again.
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A gas of certain mass occupies a volume of 650cm3 under a pressure of 750mm hg. calculated the pressure under which the volume of the gas will be reduced by 10 percents of its original volume???
Answer:
just know that if the volume is reduced by 10 the the pressure is increased by 10
Ty is three years old and as a result of a “stomach bug" has been vomiting for
about 24 hours. His blood pH is 7.48. What does this mean?
Ty's blood is slightly acidic.
Ty's blood is slightly alkaline.
Ty's blood is highly acidic.
Ty's blood is within the normal range Option 1
Answer:
Ty's blood is slightly alkaline
Explanation:
How does the work done on a machine compare to the work done by a machine?
Answer:
How does the work done on a machine compare to the work done by a machine? Because of friction, the work done by a machine is always less than the work done on the machine. What changes can a machine make to a force? Size of force; direction of force; distance through which a force acts.