Which of the following are likely to be affected by a magnet?
Check all that apply.
A. Credit card
B. A CD
C. An audio cassette tape
D. A wind up alarm clock
Answer:
B and D
Explanation:
Both a CD and alarm clock have magnetic properties of metal alloys and polymers.
HEYYYY! PLEASE HELP ME!!
Turn this Algebraic expression into a verbal expression.
2(3j+5+8j)
I need this today! The rest of it is due today too! Thank you!! <33
Answer:
22j+10
Explanation:
that is it in a verbal expression
A student notices that a basketball seems to act differently depending on whether the game is being played on a court with a wooden floor, on a concrete driveway, or on blacktop in a park. The student hypothesizes that the surface on which a ball is bounced affects the height of the bounce. How can the student design an experiment to test the hypothesis?
A.The student should drop the same ball from three different heights and have someone measure the height of each bounce.
B.The student should drop three different balls from the same height and have someone measure the height of each bounce.
C.The student should drop the same ball from the same height on three different surfaces and have someone measure the height of each bounce.
D. The student should drop three different balls from the same height on three different surfaces and have someone measure the height of each bounce.
Answer: Experimental design means creating a set of procedures to test a hypothesis. A good experimental design requires a strong understanding of the system you are studying. By first considering the variables and how they are related ( Step 1 ), you can make predictions that are specific and testable
Explanation:
A hypothesis (plural hypotheses) is a proposed explanation for a phenomenon. For a hypothesis to be a scientific hypothesis, the scientific method requires that one can test it. Scientists generally base scientific hypotheses on previous observations that cannot satisfactorily be explained with the available scientific theories. Even though the words "hypothesis" and "theory" are often used interchangeably, a scientific hypothesis is not the same as a scientific theory. A working hypothesis is a provisionally accepted hypothesis proposed for further research, in a process beginning with an educated guess or thought.
The Earth has ________ for the past 2 million years.
A. gradually warmed slowly
B. frozen then quickly thawed
C. gradually cooled
D. stayed the same temperature
E. cycled between hot and cold
The Earth has cooled for the past 2 million years.
What is the angular momentum of a 0.25 kg mass rotating on the end of a piece of
rope in a circle of radius 0.75m at an angular speed of 12.5 rad/s?
L = r x p = rmv = mr²ω
L = 0.25 x 0.75² x 12.5 = 1.758
Angular momentum of a 0.25 kg mass rotating on the end of a piece of rope in a circle of radius 0.75 m at an angular speed of 12.5 rad/s is 1.758.
What is momentum?The meaning of MOMENTUM is a property of a moving body that the body has by virtue of its mass and motion and that is equal to the product of the body's mass and velocity. Momentum is a vector quantity.
Angular momentum is momentum in angular motion,
L = r x p = rmv = mr²ω
L = 0.25 x 0.75² x 12.5 = 1.758
Angular momentum of a 0.25 kg mass rotating on the end of a piece of rope in a circle of radius 0.75m at an angular speed of 12.5 rad/s is 1.758.
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Relative density of gold is 19.3.The density of water is 1000 kg/m2 .What is the density of gold in sl units?
Answer:
Relative density refers to the ratio of density of substance to the density of reference material.
[tex]relative \: density = \frac{density \: of \: material}{density \: of \: water} \\ \\ density \: of \: gold = {relative \: density} \times density \: of \: water \\ \\ = > 19.3 \times 1000 \: kg \: m {}^{ - 3} \\ \\ = > 19.3 \times 10 {}^{3} kg \: m {}^{ - 3} [/tex]
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Four forces are exerted on a disk of radius R that is free to spin about its center, as shown above. The magnitudes are proportional to the length of the force vectors, where F1 = F4, F2 = F3 , and F1 = 2F2. Which two forces combine to exert zero net torque on the disk? Select two answers.
(A) F1
(B) F2
(C) F3
(D) F4
The given magnitude of forces of F₁ = F₄, F₂ = F₃, F₁ = 2·F₂, give the
forces that exert zero net torque on the disk as the options;
(B) F₂
(D) F₄
How can the net torque on the disk be calculated?The given parameters are;
F₁ = F₄
F₂ = F₃
F₁ = 2·F₂
Therefore;
F₄ = 2·F₂
In vector form, we have;
[tex]\vec{F_4} = \mathbf{\frac{\sqrt{3} }{2} \cdot F_4 \cdot \hat i - 0.5 \cdot F_4 \hat j}[/tex]
[tex]\vec{F_2} = \mathbf{ -F_2 \, \hat j}[/tex]
Clockwise moment due to F₄, M₁ = [tex]-0.5 \times F_4 \, \hat j \times \dfrac{R}{2}[/tex]
Therefore;
[tex]M_1 =- 0.5 \times 2 \times F_2 \, \hat j \times \dfrac{R}{2} = \mathbf{ -F_2 \, \hat j \times \dfrac{R}{2}}[/tex]
Counterclockwise moment due to F₂ = [tex]-F_2 \, \hat j \times \dfrac{R}{2}[/tex]
Given that the clockwise moment due to F₄ = The counterclockwise moment due to F₂, we have;
Two forces that combine to exert zero net torque on the disk are;
F₂, and F₄
Which are the options; (B) F₂, and (D) F₄
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13) How much mechanical energy does a swinging bowling ball have if it has 250J of kinetic energy and
800J of potential energy?
A)
B)
C)
A. ME = PE + KE
ME = mechanical energy
PE = potential energy
KE = kinetic energy
B. ME = 800 + 250
C. 1050 J
The moon remains in orbit around earth because of the force of —.
The moon remains in orbit around earth because of gravitational energy
Data;
MoonGravityGravitational EnergyMoon and other centripetal bodies maintain a state of constant orbit or centripetal acceleration because of gravitational energy.
The gravitational energy acting on the moon keeps the body rotating. This is further elaborated by Einstein's theory of relativity.
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write the type of energy present in pond water and kerosene ?
Answer:
Potential and Kinetic energy
Explanation:
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dentical forces act for the same length of time on two different objects. The magnitude of the change in momentum of the lighter object is
Now build the complete circuit. Connect a wire to each end of the pair of batteries. Then add the lightbulb and the switch, using additional wires as needed. To disconnect two parts, click where they’re joined, and then click Split Junction. You can also click Reset All to start over. You’ll be successful when you can close the switch (click, hold, and drag it) and the lightbulb glows. Use the drawing tool to sketch the parts of your successful circuit
Answer: <3
Explanation:
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Kinetic energy lab report (soda bottle and bean bag) Does anyone have the data part filled out?
Answer:I added my whole lab report into here let me know if this the what you need
Explanation:
Give five important things any physic’s student ahould know?
Answer:
students need to take courses in math, such as calculus, linear algebra, and statistics. Computer science classes also are essential, because physicists and astronomers often develop specialized computer programs that are used to gather, analyze, and model data.
A body of mass 10 kg is being rotated in a circular path of
diameter 1.0 mm on a frictionless horizontal plane by means of
a string. It performs 10 revolutions in 3.14 s. Calculate the
centripetal force acting on it.
Answer:
The answer is 2N
Explanation:
Given;mass (m) = 10 kgDiameter (d) = 1 mmTo Find;The centripetal force acting on it.Now,
Radius (r) = Diameter ÷ 2
r = 1/2
r = 0.5 mm = 5 × 10‾⁴
T = 3.14 ÷ 10 = π/10 sec
∴ F = mrω² = mr (2π/T)² = 4π²mr/T²
F = 4 π² × 10 × 5 × 10‾⁴/(π/10)²
F = 4 π² × 10 × 5 × 10‾⁴ × 100/π²
F = 4 × 0.5
F = 2 N
Thus, The centripetal force acting on it is 2 Newton
-TheUnknownScientist 72
The system is in equilibrium, and the pulleys are weightless and frictionless.
Find the tension T.
The acceleration of gravity is 32 ft/s^2
Note: lb ≡ slug · ft/s^2
Answer in units of lb.
There is an attachment of the system below
Answer:
F = M a where F is in lbs, M in slugs and a in ft/s^2
Apparently this system is motionless so
T + 15 is the downward force on the mass of 15 lbs
1 slug * 32 ft/s^2 is 32 lbs the weight of the other block
It takes a force of 32 / 2 = 16 lbs on the cable to support this weight
16 lbs = T + 15 lbs
T = 1 lbs
What is the difference between mass and weight?
Answer:
We often use the world's 'mass'and 'weight' interchangeable,but they mean quite different things.Your mass is the same no matter where you go in the universe;your weight,on the other hand,changes from place to place.
Explanation:
hope it helps
Wonder Woman uses 2,000 N to lift a truck 2.3 meters in 5 seconds. How much power did she use?
Answer:
she used alot
Explanation:
she would need to be very powerful if she coukd do that.. but then again its wonder woman.
(srry just so detail )
but
f=2,000
x=2.3
w=?
2,000x 2.3 =869.57
w=869.57
t=5 s
p=?
p=w/t
869.57/5=173.913
so she used 173.913 w also known as power
A solar eclipse occurs when the Moon moves directly between the Earth and the Sun. When Venus moves directly between the Earth and the Sun, we do not see an eclipse for several reasons including ________________.
Answer:
it's because the eclipse hides the moon and Venus and the sun
Explanation:
I found it
An electron is constrained to the central perpendicular axis of a ring of charge of radius 2.7 m and charge 0.027 mC. Suppose the electron is released from rest a distance 0.035 m from the ring center. It then oscillates through the ring center. Calculate its period. (The electron is always much closer to the ring center than a radius.)
The period is mathematically given as
t=7.34*10^{-8}s
What is the period?
Question Parameters:
Charge of radius 2.7 m and charge 0.027 mC.
The electron is released from rest at a distance of 0.035 m from the ring center.
Generally, the equation for the angular velocity is mathematically given as
[tex]w^2=\frac{KQq}{R^3}[/tex]
Therefore
[tex]W^2=\frac{9*10^9*9.1*10^{-5}*1.6*10^{-19}}{2.7^3*9.1*10^{-31}}[/tex]
w^2=7.316*10^{15}
w=8.55*10^2
Therefore
[tex]2\pi/t=w\\\\2\pi/t=8.55*10^2[/tex]
t=7.34*10^{-8}s
In conclusion, The period is
t=7.34*10^{-8}s
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Newton's First Law is also called the Law of Inertia. Which of the objects below has the most inertia, the white truck or yellow truck? Explain the reason for your choice.
Answer:
Personally I say the yellow truck but...
Explanation:
It's heavily based on the object's mass...
If you know which object has the most mass than I would choose that one, but personally I think the yellow one has the most mass...
The table shows the mechanical energy and velocity of a rock that was thrown four times. The rock has a mass of 2. 4 kg. A 3 column table with 4 rows. The first column is labeled trial with entries 1, 2, 3, 4, 5. The second column is labeled mechanical energy in joules with entries 32, 34, 35, 31. The last column is labeled velocity in meters per second with entries 7. 0, 2. 0, 6. 0, 3. 0. During which trial was the rock the highest above the ground? 1 2 3 4.
The energy to the position is known as potential energy. The maximum potential energy is in case 2. Hence the maximum height will be in case 2.
What is kinetic energy?The energy of the body by the virtue of its motion is known as the kinetic energy of the body. It is defined as the product of half of mass and square of the velocity.
According to the law of conservation of energy, the total energy is defined as the sum of kinetic energy and potential energy.
Mechanical energy = kinetic energy+potential energy
Potential Energy = Mechanical Energy - Kinetic Energy
As a result, if an object has greater potential energy, it will have a higher height.
The formula for the kinetic energy is given by;
The potential energy for the different cases will be;
Case-1;
[tex]\rm KE_1=\frac{1}{2}mv^2 \\\\ \rm KE_1=\frac{1}{2}\times2.4(7)^2 \\\\ \rm KE_1=58.8 J[/tex]
[tex]\rm PE_1 = 32 - 58.8 = -26.8 J[/tex]
Case-2;
[tex]\rm KE_2=\frac{1}{2}mv^2 \\\\ \rm KE_2=\frac{1}{2}\times2.4(2)^2 \\\\ \rm KE_2=4.8 J[/tex]
[tex]\rm PE_2 = 34 - 4.8 = 29.2 J[/tex]
Case-3;
[tex]\rm KE_3=\frac{1}{2}mv^2 \\\\ \rm KE_3=\frac{1}{2}\times2.4(6)^2 \\\\ \rm KE_2=43.2 J[/tex]
[tex]\rm PE = 35 - 43.2 = -8.2 J[/tex]
Case-4;
[tex]\rm KE_3=\frac{1}{2}mv^2 \\\\ \rm KE_3=\frac{1}{2}\times2.4(3)^2 \\\\ \rm KE_2=10.8 J[/tex]
[tex]\rm PE_2 = 31 - 10.8 = 20.2 J[/tex]
The maximum potential energy is in case 2. Hence the maximum height will be in case 2.
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Answer:
B:
the SECOND trial
Explanation:
What element is an important part of forming polymers? Why?
Answer:
What element is most likely to form polymers?
Because they contain carbon, polymers are categorized as organic compounds. The most common element found in polymers, besides carbon, is hydrogen. Many polymers are manufactured from feedstock, or starting materials, obtained from petroleum.
A 12. 0 cm object is 9. 0 cm from a convex mirror that has a focal length of -4. 5 cm. What is the distance of the image from the mirror? –3 cm –4 cm 3 cm 4 cm.
A mirror equation is an equation that relates object distance and image distance to focal length. The distance of the image from the mirror will be -3 cm.
What is a mirror equation?A mirror equation is an equation that relates object distance and image distance to focal length. It's sometimes referred to as a mirror formula.
[tex]\rm \frac{1}{v} +\frac{1}{u} =\frac{1}{f} \\\\[/tex]
The given data in the problem is;
f is the focal length = -4. 5 cm
u is the object distance=12. 0 cm
v is the image distance =?
[tex]\rm \frac{1}{v} +\frac{1}{12.} =\frac{1}{-4.5} \\\\ \rm \frac{1}{v}= \frac{1}{-3} \\\\ \rm v= -3cm[/tex]
Hence the distance of the image from the mirror will be -3 cm.
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How can a particle that has zero mass (travels at the speed of light) carry energy, and excite cells in our eyeballs?
Answer:
Quantum theory states that electromagnetic radiation travels in discrete amounts with energy
h ν = E = h c / f
The light we see from the sun comes from which layer?.
Answer:
The Photosphere
Explanation:
It's photosphere is the sun's area that lights . This layer is responsible for nearly all of the Sun's light.
Answer:
The photosphere
Explanation:
The light we see from the sun comes from the photosphere.
A particle with charge q, mass m, and initial speed v0 in the x direction enters a region where the electric field is uniform in the x direction. How much time does it take for the particle to cross the region of length d
Answer:
S = 1/2 Vo t + 1/2 a t^2 = d time for particle to travel distance d
F = E q force acting on particle
a = F / m = E q / m
d = Vo t + E q / (2 m) t^2
One would need to solve the quadratic equation shown to find the time t
t^2 + (2 m) / E q * V0 t - (2 m) / E q * d = 0
or t^2 + A V0 t - A d = 0 where A = (2 m) / E q
can someone please answer this, Ill give you brainliest and your getting 100 points.
Explanation:
Take a look at South American and African plates.
Both have plates moving in opposite directions Soon they will go away and leave water in sideOption C is correct
Why should a strong magnet not be near a credit or debit card
Answer:
Magnets can tamper with the magnetic strip on credit cards, erasing the information stored there and rendering them useless
Write any Four Characteristics of image, formed by Plane Mirrors .
Question :-
Write any Four Characteristics of image, formed by Plane Mirrors .Answer :-
The Image formed by Plane Mirrors are Virtual and Erect .The Image formed by Plane Mirrors are laterally Inverted .They are Same Sized as that of the Objects .The Image Distance from the Mirror is Same as the Distance of Object from the Mirror .[tex] \underline {\rule {180pt} {4pt}} [/tex]