A Personality test is said to be reliable because (A). a reliable test will give consistent results over time.
Meaning of Personality testPersonality test can be defined as a test that can be used to verify or ascertain an individuals personality.
Personality test is a test that is carried out by different organizations to help to help them know the individuals in that organization and to help others know how to relate and work with them.
In conclusion, A Personality test is said to be reliable because a reliable test will give consistent results over time.
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Answer:
a.
Explanation:
12. what is the wavelength of em radiation that ejects 2.00-ev electrons from calcium metal, given that the binding energy is 2.71 ev? what type of em radiation is this?
From the calculation, the wavelength of the waves is about 264 nm and belongs to the ultraviolet spectrum.
What is photoelectric effect?The term photoelectric effect can be used to describe the loss of electron from the surface of a metal. Given that; KE = E - W, where;
KE = kinetic energy of the emitted photoelectron
E = energy of the photon
W = work function of the metal
[tex]2= E - 2.71\\E = 2 + 2.71\\E = 4.71ev or 7.5 * 10^-19 J[/tex]
λ= hc/E
λ= [tex]6.6 * 10^-34 * 3 * 10^8/7.5 * 10^-19[/tex]
λ= [tex]2.64 * 10^-7 m[/tex] or 264 nm
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7) Which forces can be either attractive or
repulsive?
(1) gravitational and magnetic
(2) electrostatic and gravitational
(3) magnetic and electrostatic
(4) gravitational, magnetic, and electrostatic
The magnetic and electrostatic can be either attractive or repulsive. The correct option is C.
What is force?A push or pull that an object experiences as a result of interacting with another item is known as a force. Every time two items interact, a force is exerted on each of the objects.
Non-contact forces, such as electrostatic forces, pull or push on objects without actually making contact with them.
When certain materials are rubbed together, a phenomenon known as "charge" can be transferred from one surface to another.
One of the four fundamental forces of nature, the electromagnetic force, results in the magnetic force, which is brought about by the motion of charges.
When two charge-containing objects move in the same direction, a magnetic attraction pulls them together.
Thus, the correct option is C.
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What are the spectral type, temperature, absolute magnitude number, and luminosity of
star a?
The spectral type is B, the temperature is 18,000, the absolute magnitude is 0 and the luminosity is 100.
What is luminosity?The value of luminosity is independent of an observer's distance from an object since it is an absolute measure of radiant power.
Astronomers commonly express an object's brightness in terms of solar luminosities, with one solar luminosity equaling the luminosity of the Sun.
Hence, the spectral type is B, the temperature is 18,000, the absolute magnitude is 0, and the luminosity is 100.
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When a baseball is hit, it travels around 65 mps (meters per second). the mass of the baseball is 0.145 kg. what is the kinetic energy of the baseball?
Answer:
306J
Explanation:
The formula for kinetic energy is given as ½mv².
Using this, we get our answer by substituting the values into the formula.
½ × 0.145kg × 65m/s
= 306.31J
can be rounded off to 306J
a heavenly body has a mass equal to half of the mass of the earth and its radius half as that of the earth . if a stone weight 100N on the surface of the earth , find the weight of the stone on the heavenly body.
The stone on the celestial body will be 50 N in weight. When the mass of a celestial body equals half of the mass of the earth.
What is the difference between mass and weight?The mass of the body is defined as the amount of matter a body has. It is denoted by m and its unit is kg.
Weight is defined as the amount of force an object exerts on the surface. It is given as the product of mass and the gravitational pull.
Given data:
[tex]\rm m_h = \frac{1}{2} m_E[/tex]
[tex]\rm r_h=\frac{1}{2} r_E[/tex]
[tex]\rm W_E = 100 \ N[/tex]
The weight of the body on earth is found as;
[tex]\rm W_E = m_Eg[/tex]
Substitute all the values:
[tex]\rm W_E = m_Eg \\\\\ 100 \ N = 2 m_hg \\\\ m_hg =50 \ N \\\\ W_h = 50 \ N[/tex]
Hence, the weight of the stone on the heavenly body will be 50 N.
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The diagram shows two sets of vectors that result in a
single vector.
50 m
200 m
100 m
R
250 m
What are the first two steps for finding the magnitude
of the resultant vector?
find the square of the first horizontal vector and the
square root of the first vertical vector
find the square root of the first horizontal vector and
the square root of the second horizontal vector
find the sum of the two horizontal vectors and the
sum of the two vertical vectors
find the difference between the two horizontal
vectors and the difference between the two vertical
vectors
The first two steps for finding the magnitude of the resultant vector is find the sum of the two horizontal vectors and the sum of the two vertical vectors.
Resultant of two vectorsThe resultant of two vectors is determined from Pythagoras theorem is as shown below.
R² = a² + b²
First two steps of finding a resultant vectorsfind the sum of the two horizontal vectors and the sum of the two vertical vectors.Thus, the first two steps for finding the magnitude of the resultant vector is find the sum of the two horizontal vectors and the sum of the two vertical vectors.
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If a car is traveling along a highway at a speed of 30 meters/second, what distance will it cover in one minute?
A.
0.5 meter
B.
2 meters
C.
90 meters
D.
180 meters
E.
1,800 meters
Answer:
E......1,800 meters
Explanation:
distance = speed × time
convert 1 min to seconds because speed is give in meters per seconds so it's which is 60 seconds
Then...60 ×30 = 1,800
whats does 14.600 oz = to in grams
Given that 1 ounce equals 28.35 grams, the value of 14.600 ounces in grams is approximately 413.9g.
What is the value of 14.600 oz in grams?Note that:
1 ounce = 28.35 grams
Given that;
Value of mass = 14.600 ozValue of mass in gramsSince 1 ounce = 28.35 grams, 14.600 oz will be;
14.600 oz = ( 14.600 × 28.35) grams
14.600 oz = 413.9g
Given that 1 ounce equals 28.35 grams, the value of 14.600 ounces in grams is approximately 413.9g.
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Explain how fusion and fission are similar to and different from each other at the atomic level. Explain which
process is currently used at most nuclear power plants around the world and which process occurs on the sun.
Please helpp
Nuclear fusion and fission involve changes in the nucleus of atom, but nuclear fission is most in employed nuclear power plants around the world whereas fusion occurs on the sun.
What are nuclear fission and fusion reactions?
Nuclear fission is a reaction in which the nucleus of large atoms are split into nuclei of two or more smaller atoms.
Nuclear fusion is a reaction in which nuclei of two or more smaller atoms are combined to give an atom of larger nucleus.
Large amounts of energy are involved in both reactions.
The Sun produces energy by nuclear fusion.
However, the most commonly employed method in nuclear power plants is nuclear fission because the necessary conditions required for nuclear fusion have not being developed currently.
Therefore, nuclear fusion and fission involve changes in the nucleus of atom, but nuclear fission is most in employed nuclear power plants around the world whereas fusion occurs on the sun.
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The particle of 2 velocities 10m/s due east and 12m/S in the direction 30N/E. What is the resultant velocity and the direction?
Answer:
See below
Explanation:
East components are 10 and 12 cos 30 = 20.392 m/s
North component = 12 sin 30 = 6 m/s
Resultant velocity = sqrt ( 20.392^2 + 6^2) = 21.26 m/s
direction arc tan (6/20.392) = 16.4 degrees N of east
Calculate the velocity of an object.
moved around a circle with a radius of
1.65m and an acceleration of 3.5 rad /s²
Answer:
5.775 m/s
Explanation:
radial acceleration = velocity / radius
=> velocity = radial acceleration * radius
=> v = 3.5 * 1.65 = 5.775 (m/s)
Supplementary units are dimensionless. Give reasons
Answer:
Supplementary units are the dimensionless units that are used along with the base units to form derived units in the International system.
Explanation:
Since they have no units under SI system, they can be considered dimensionless.
Hope it helps you :))))
have a good day
Which times and distances are represented by the function? select three options. the starting distance, at 0 hours, is 300 miles. at 2 hours, the traveler is 725 miles from home. at 2.5 hours, the traveler is still moving farther from home. at 3 hours, the distance is constant, at 875 miles. the total distance from home after 6 hours is 1,062.5 miles.
The times and distances are represented by the function are
at 2 hours, the traveler is 725 miles from home. at 3 hours, the distance is constant, at 875 milesthe total distance from home after 6 hours is 1,062.5 miles.What is distance?The distance is the length of path travelled by a body when moving with some speed and taking time t.
Given function is
D (t) = 300t +125 for 0≤t<2.5
D (t) = 875 for 2.5 ≤t≤3.5
D(t)= 75t +612.5 for 3.5<t≤6
According to the given function, for 2 hours, the traveler will travel from home,
D (2) = 300x2 +125 = 725 miles.
For time between 2.5 to 3.5 hr, the distance is constant i.e. 875 miles.
For total time 6hr, the distance travelled will be
D(6) = 75 x 6 +612.5 = 1062.5 miles.
Thus, the correct options are picked up.
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Answer:
B, D, E
Explanation:
got it right on edge
Sound waves with a constant frequency of 250 hertz are traveling through air at stp. what is the wavelength of the sound waves
Answer:
wave length is 1.2m
Explanation:
since formula of wave length is v/f
v(speed of sound in air at stp is 300ms^-1)
f(frequency 250hertz)
then wave length is 300÷250 which give 1.2m
Sound waves with a constant frequency of 250 hertz are traveling through air at stp. what is the wavelength of the sound waves is 1.32 m.
What is wave ?Wave is is a disturbance in a medium that carries energy as well as momentum . wave is characterized by amplitude, wavelength and phase. Amplitude is the greatest distance that the particles are vibrating. especially a sound or radio wave, moves up and down. Amplitude is a measure of loudness of a sound wave. More amplitude means more loud is the sound wave.
Wavelength is the distance between two points on the wave which are in same phase. Phase is the position of a wave at a point at time t on a waveform. There are two types of the wave longitudinal wave and transverse wave. Longitudinal wave : in which, vibration of the medium (particle) is parallel to propagation of the wave. Sound wave is a longitudinal wave. Transverse wave : in which, vibration of the medium (particle) is perpendicular to propagation of the wave.
speed of the wave,
c = νλ
330 m/s = 250λ
λ = 330/250 = 1.32 m
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Question 1 of 10
During an experiment, you take a measurement of 18.3 inches. What is this
measurement in centimeters? 1 in = 2.54 cm.
Answer:
[tex]46.482 cm[/tex]
Explanation:
[tex]Since 1 in = 2.54cm\\\\18.3 inches =(18.3 x 2.54) cm\\ =46.482cm[/tex]
Choose the items that help to fully describe voltage.
Answer:
the easy way to describe this is to use a light as an example.
Explanation:
Voltage is pretty much the loop used to help use a lightbulb to emit light. Without voltage, we would be unable to use lightbulbs. This applies to much more than a lightbulb, but it's the easiest way to describe how voltage works.
3. why is the sum of the maximum voltages across each element in a series r l c circuit usually greater than the maximum applied voltage? doesn't that inequality violate kirchhoff's loop rule?
The sum of the maximum voltages across each element in a series RLC circuit is usually greater than the maximum applied voltage because voltages are added by vector addition.
What is the Kichoff's loop rule?Kirchhoff's loop rule states that the algebraic sum of potential differences, as well as the voltage supplied by the voltage sources and resistances, in any loop must be equal to zero.
In a series RLCcircuit, the voltages are not added by scalar addition but by vector addition.
Kirchhoff's loop rule is not violated since the voltages across different elements in the circuit are not at their maximum values.
Therefore, the sum of the maximum voltages across each element in a series RLC circuit is usually greater than the maximum applied voltage because voltages are added by vector addition.
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Question 10 of 10
What is density?
A. The net energy transferred between two objects
B. A measure of mass per unit volume
OC. The force exerted on an area
OD. A measure of the movement of molecules
Answer:
B. A measure of mass per unit volume
Explanation:
trust me
Answer:ITS C I PASSED THE TEST
Explanation:I DID THE PLATO
John pulls a sled on a frictionless surface with a force of 60 N at an angle of 37o above the horizontal. If he pulls it a distance of 12 m, the work he does is: g
The work John does is 680 J (joules).
To calculate the work done by John, we need to use the formula:
Work = Force * Distance * cos(theta)
where Force is the applied force, Distance is the displacement, and theta is the angle between the force and the displacement.
Substitute the given values into the formula:
Force = 60 N
Distance = 12 m
theta = 37 degrees
Convert the angle from degrees to radians:
theta_radians = 37 degrees * (pi/180)
Calculate the cosine of the angle:
cos(theta_radians) = cos(37 degrees * (pi/180))
Calculate the work done by John:
Work = 60 N * 12 m * cos(37 degrees * (pi/180))
Simplify the equation and calculate the numerical value:
Work ≈ 680 J (joules)
Therefore, the work done by John is approximately 680 joules.
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What will be the final velocity of a 5.0 g bullet starting from rest, if a net force of 45 N is
applied over a distance of 0.80 m?
The net force performs a total amount of work equal to
(45 N) (0.80 m) = 36 J
on the bullet, and this is in turn is equal to the change in the bullet's kinetic energy by the work-energy theorem. So we have
W = ∆K = 1/2 mv²
since the bullet starts at rest, where m = its mass and v = its final velocity.
Solve for v :
36 J = 1/2 (0.0050 kg) v² ⇒ v = 120 m/s
a metallic surface is illuminated with light of wavelength 400 nm. if the work function for this metal is 2.4 eV. what is the maximum kinetic energy of the ejected electrons, in electron volts?
Assume that
1 eV = 1.6 * 10^-19
c = 3 * 10^8
h = 6.626 * 10^-34
I already got the answer before and I know that the max kinetic energy is 0.71 eV but when I tried to solve it again, I forgot what to do.
I tried getting the cut off wave lengths and using that combined with the wavelength provided to get the K.E max but it didn't work
The maximum kinetic energy of the ejected electrons will be 0.71 eV.
What is the kinetic energy of electrons?The kinetic energy (KE) of electrons is defined as the product of one-half of the mass of the electron to the square of the velocity at which electrons spin in orbit.
Given data;
λ(Wavelength)= 400 × 10⁻⁹ m
Φ(Work function)=2.4 eV
c(Speed of light)= 3 ×10⁸ m/sec
h(Constant) = 6.626 * 10^-34
[tex]\rm \phi = 2.4 eV = 2.4 \times 1.6 \times 10^{-19} \\\\ \rm \phi =3.84 \times 10^{-19} \ J[/tex]
The maximum kinetic energy is found as;
[tex]\rm KE= \frac{hc}{\lambda} - \phi \\\\ KE= \frac{6.64 \times 10^{-34}}{400 \times 10^{-9}} -3.84 \times 10^{-19} \\\\ KE=1.14\times 10^{-19} \ J[/tex]
Unit conversion:
1 eV = 1.6 * 10⁻¹⁹ j
1 J=1/( 1.6 * 10⁻¹⁹) ev
KE=0.71 eV
Hence, the maximum kinetic energy of the ejected electrons will be 0.71 eV.
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Question 1 of 32
Evaluate sin(55°).
From the four figure table, the value of sin(55°) to 4 dp is 0.8192.
What are trigonometric ratios?The term trigonometric ratios are those ratios that are obtained using the sides of a right angled triangle and they are sine, cosine and tangent.
If we have the value sin(55°), upon evaluation, we realize that the value of sin(55°) to 4 dp is 0.8192.
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which change to an object would reduce its kinetic energy by half
Answer:
I don't really understood the question
The resulting net force of an object is represented below.
→10 N
Which most likely represent the forces acting on the object?
↑ 63 N and ↓ 73 N
↑ 97 N and ↓ 87 N
← 63 N and → 73 N
← 97 N and → 87 N
The option which most likely represent the forces acting on the object is ← 63 N and → 73 N.
What is Net force?When two or more forces are acting on the system of objects, then the to attain equilibrium, net force must be zero.
When the resulting net force of an object is →10 N
The forces must be in x and -x direction to balance and give net force of 10 N in +x direction.
So, +73N -63 N = +10 N
Thus, the correct option is ← 63 N and → 73 N
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According to the universal law of gravitation, the force due to gravity is b. directly proportional to the square of the distance between objects. d. not dependent on the distance between objects. c. inversely proportional to the distance between objects. a. inversely proportional to the square of the distance between objects. e. directly proportional to the distance between objects.
According to the universal law of gravitation, the force due to gravity is a. inversely proportional to the square of the distance between objects.
What is the universal law of gravitation?
Newton's law of universal gravitation states that objects are attracted to each other in the universe with a force directly proportional to the product of their masses and inversely proportional to the square of their distance apart.
The equation that represents this law is;
F = G × M1M2 ÷ r∧2
Where,
F is the gravitational force acting between two objects
M1 and M2 are the masses of the objects
r is the distance between the centers of their masses
G is the gravitational constant.
Thus. according to the universal law of gravitation, the force of gravity is inversely proportional to the square of the distance between objects.
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Two blocks are on a horizontal frictionless surface. Block a is moving with an initial velocity
The final velocity of the block A will be 2.5 m/sec. The principal of the momentum conversation is used in the given problem.
What is the law of conservation of momentum?According to the law of conservation of momentum, the momentum of the body before the collision is always equal to the momentum of the body after the collision.
In a given concern, mass m₁ is M, mass m₂ is 3M. Initial speed for the mass m₁ and m₂ will be u₁=5 and u₂=0 m/s respectively,
According to the law of conservation of momentum
Momentum before collision =Momentum after collision
m₁u₁+m₂u₂=(m₁+m₂)v
M×5+3M×0=[M+3M]v
The final velocity is found as;
V=51.25 m/s
The velocity of block A is found as;
[tex]\rm V_f=\frac{(m_1-m_2)u_1}{m_1+m_2} +\frac{2m_2u_2}{m_1+m_2} \\\\ V_f=\frac{(M-3M)5+2\times3M\times0}{m_1+m_2} \\\\ V_f=2.5 m/s[/tex]
Hence, the final velocity of the block A will be 2.5 m/sec.
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You launch a model rocket that has a mass of 1 kg. At a height of 500 m, it is
traveling at 120 m/s. What is its kinetic energy at this point?
A- 7,200j
B- 29J
C-60J
D- 14,400J
Based on the calculations, the kinetic energy of the model rocket at this point is equal to: A. 7,200 Joules.
Given the following data:
Mass = 1 kg.
Height = 500 m.
Velocity = 120 m/s.
How to calculate kinetic energy?Mathematically, kinetic energy can be calculated by using this formula:
K.E = 1/2 × mv²
Where:
K.E is the kinetic energy.M is the mass.V is the velocity.Substituting the given parameters into the formula, we have;
K.E = 1/2 × 1 × (120)²
K.E = 1/2 × 1 × 14,400
K.E = 7,200 Joules.
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In alpha decay, alpha particles are ejected from the nucleus. which equation represents alpha decay?
Out of the given equations,
241Am 23Np + 4He
18F → 180+ °C
14C → 14N+_e
152 Dy → 15. Dy+y
The first equation shows the alpha decay which is ₉₅Am²²⁴ → ₉₃Np²³⁷ + ₂He⁴
What is alpha radiation?Alpha particles are emitted in the form of radiations when radioactive decay occurs. The atom of heavy nucleus emit the alpha particles that consist of two proton and two neutrons, also called helium nuclei.
The properties of alpha radiations are:
Alpha radiations can travel in a short distance.They can not penetrate into the skin or clothes.They can be harmful for the human when inhaled.They can be stopped by a piece of paper.The Americium with atomic weight 224 undergo alpha decay and produce ₉₃Np²³⁷ . The alpha particle is helium nuclei.
₉₅Am²²⁴ → ₉₃Np²³⁷ + ₂He⁴
Thus, the first equation represents alpha radiation.
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2. Infer how hydrostatic equilibrium in a star is determined by mass-
Answer:
Greater gravity compresses the gas, making it denser and hotter, so the outward pressure increases. In any given layer of a star, there is a balance between the thermal pressure (outward) and the weight of the material above pressing downward (inward). This balance is called hydrostatic equilibrium.
A ball rolling without slipping on a horizontal surface encounters a frictionless
The motion of the ball on the frictionless ramp is defined by increasing translational speed with non zero angular speed. The correct option is C.
What is angular speed?When a body is moving on a circular track, the speed of the particle is called as the angular speed.
When a ball is rolling without slipping, the motion is both translational and rotational. At point of contact at rest, the velocity is zero. The ball rolls without slipping only if the ball moves with zero speed at point of contact.
On the inclined part, the gravity acts straight downward. Velocity remains constant, ramp pushes back the ball and so the ball pushes ramp. There will be no acceleration and velocity remains constant. The angular speed is directly proportional to the linear velocity.
Thus, the correct option is C.
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