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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How long does 100m long train take a cross a bridge of length 4.9 km at a speed of 50m/s
Answer:
it would take 100s for the train to crossthe bridge
Calculate the work done by a bulldozer of power 5000W in 15 seconds
[tex]\text{Work done,}~W = Pt \\\\~~~~~~~~~~~~~~~~~~~~=5000~W \times 15 ~s\\\\~~~~~~~~~~~~~~~~~~~~=75000~ J[/tex]
Answer:
75kJ
Explanation:
Formula :
Work done = Power × Time
===========================================================
Given :
⇒ Power = 5000 W = 5kW
⇒ Time = 15 seconds
=============================================================
Solving :
⇒ Work done = 5kW × 15s
⇒ Work done = 75kJ
How do I do this? I’m super confused.
Explanation:
yes, correct, from the batteries, wires and bulbs. in short, from everything that is part of the circuit.
electricity is just a push on mostly already existing electrons to move along.
a battery has a surplus of electrons at the "-" pole, and an electron deficiency at the "+" pole. that creates an electromagnetic "pressure" (voltage), the surplus (ampere) squeezes into the circuit, while the deficiency pulls like a vacuum, and all that creates an electromagnetic field around the whole circuit, which moves also the existing electrons, pushing/sucking electrons at the end of the circuit "chain" into the "+" pole.
A crane does exactly 1800 J of work to lift a steel beam from the ground. The beam is accidentally dropped and falls back to its starting position in 0.9 s. What is the mass of the beam
Answer:
Explanation:
1800x0.9=1620kg
You want to go jogging at a nearby park. your mother says a thunderstorm is five miles away. the safest thing to do in this situation is to
bring your cell phone for emergencies
find an indoor place to exercise
go jogging quickly before the storm comes
wear a poncho while jogging
Answer:
"find an indoor place to exercise"
I think that golf courses call in the golfers if there is a lightning strike within 5 miles of the golf course sensor.
What is conflict resolution?
A.) committing to fair play
B.) settling a dispute or disagreement
C.) working toward a common goal
D.)trying your best to win
Answer:
B) Settling a dispute or disagreement
Explanation:
A conflict is a disagreement or argument between opposing parties.
A resolution is a solution to a problem.
Knowing both these definitions, the answer choice that makes the most sense would be B) Settling a dispute or disagreement.
Hope this helps!!
You apply a horizontal force of 25N to push a shopping cart across the parking lot at a constant velocity. a) what is the net force on the shopping cart ? b) What is the force of friction on the shopping cart ? c) What will happen to the shopping cart if you come across a wet portion of the parking lot and you continue to apply the same force ?
(a) The net force on the shopping cart is zero.
(b) The the force of friction on the shopping cart is 25 N.
(c) When same force is applied to the shopping cart on a wet surface, it will move faster.
Net force on the shopping cartThe net force on the shopping cart is calculated as follows;
F(net) = F - Ff
where;
F is the applied forceFf is the frictional forcema = F - Ff
where;
a is acceleration of the cartm is mass of the cartat a constant velocity, a = 0
0 = F - Ff
F(net) = 0
F = Ff = 25 N
Net force is zero, and frictional force is equal to applied force.
On wet surfaceCoefficient of kinetic friction of solid surface is greater than that of wet surface.
Since frictional force limit motion, when the frictional force is smaller, the object tends to move faster.
Thus, the cart will move faster on a wet surface due to decrease in friction.
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An Olympic sprinter completes the 100 m race in a time of 10 s. Calculate the average speed of the sprinter.
Taking into account the definition of speed, the average speed of the Olympic sprinter is 10 [tex]\frac{m}{s}[/tex].
What is speedSpeed is a physical quantity that expresses the relationship between the space traveled by an object and the time used for it.
In other words, speed can be defined as the amount of space traveled per unit of time with which a body moves and can be calculated using the expression:
[tex]speed=\frac{distancetraveled}{time}[/tex]
Average speed of the sprinterIn this case, you know:
distance traveled= 100 meterstime= 10 secondsReplacing these values in the speed definition:
[tex]speed=\frac{100 m}{10 s}[/tex]
Solving:
speed= 10 [tex]\frac{m}{s}[/tex]
In summary, the average speed of the Olympic sprinter is 10 [tex]\frac{m}{s}[/tex].
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please help Which graph shows the change in velocity of an object in free fall?
The graph that shows the change in velocity of an object in free fall is graph B.
What is velocity?Velocity is the speed of a body in a specified direction.
It is also defined as the ratio of displacement and tome.
Velocity is a vector quantity.
The change in velocity of a body is known as acceleration.
The velocity of a body undergoing free fall increases by a constant value given as by the acceleration due to gravity.
The graph which depicts this change in velocity is B.
Therefore, the graph that shows the change in velocity of an object in free fall is graph B.
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How does the value of gravity vary as you go:
i. above the earth surface?
ii. below the earth surface?
Answer:
Gravity changes with altitude. as we know The gravitational force is proportional to 1/R2, where R is your distance from the center of the Earth.
eg. The radius of the Earth at the equator is 6400 kilometers.
Let's say you were in a jet at the equator that was 40 kilometers high above the earth's surface.
may be helpfull
A car and an SUV both hit a patch of ice while driving eastbound down the road. The 1200-kg car was moving at 5 m/s when the 2600-kg SUV hit it from behind at a speed of 12 m/s. Upon impact, the car veers off the side of the road at a speed of 10 m/s. The SUV continues forward at its new velocity. Calculate the final speed of the SUV.
Velocity: _ m/s
The final speed of the SUV given the data from the question is 9.79 m/s
Data obtained from the questionMass of car (m₁) = 1200 KgVelocity of car (v₁) = 5 m/sMass of SUV (m₂) = 2600 KgVelocity of SUV (v₂) = 12 m/sFinal velocity (v) =?How to determine the final velocity of SUVFrom conservative of linear momentum,
momentum before impart = momentum after impart
m₁v₁ + m₂v₂ = v(m₁ + m₂)
Thus, we shall determine the final velocity of the SUV by obtaining the velocity after impart. This can be obtained as follow:
v = (m₁v₁ + m₂v₂) / (m₁ + m₂)
v = [(1200 × 5) + (2600 × 12)] / (1200 + 2600)
v = [(6000 + 31200)] / 3800
v = 37200 / 3800
v = 9.79 m/s
Thus, the final velocity of the SUV is 9.79 m/s
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What is true about determining the time of death of a victim?
group of answer choices=
forensic pathologists usually determine the exact time of death.
determining the time of death is critical to all criminal cases.
forensic scientists can often provide an estimated time of death.
the exact time of death can only be determined with dna evidence.
Forensic scientists can often provide an estimated time of death. Option C is correct.
What is forensic science?By gathering and evaluating evidence, forensic science specialists support criminal investigations. Numerous technicians focus on either laboratory analysis or crime scene investigation.
Often, forensic experts can approximate the time of death.
Hence, the right answer is C.
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What was the name of the first living being to be put into orbit?.
When an atom changes by alpha decay, its atomic number
When an atom changes by alpha decay, its atomic number decreases because of the losing of proton and neutron.
What changes occur when alpha decay occur?An alpha particles is a helium nucleus that contains 2 protons and 2 neutrons. When the alpha decay occur, the atom loses an alpha particle which causes the loss of proton and neutron thus decreases the mass number as well as atomic number occur.
So we can conclude that When an atom changes by alpha decay, its atomic number decreases because of the losing of proton and neutron.
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A surfacing whale in an aquarium produces water wave crests every 0.40 seconds. If the water wave travels at 4.5 meters per second, the wavelength of the wave is
For a surfacing whale in an aquarium produces water wave crests every 0.40 seconds.is mathematically given as
w= 1.8m
What is the wavelength of the wave?Generally, the equation for is mathematically given as
w=V*T
Therefore
w=V*T
w=4.5 m/s*0.40s
w= 1.8m
In conclusion, the wavelength of the wave
w= 1.8m
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What was the acceleration of the cart with the low fan speed
The acceleration of the cart is low with the low fan speed because acceleration depends on speed.
What was the acceleration of the cart with the low fan speed?The acceleration of the cart with the low fan speed is also lower because acceleration depends on the velocity or speed of an object. If speed is lower, the body moves very slow and the acceleration is also low and vice versa.
So we can conclude that the acceleration of the cart is low with the low fan speed because acceleration depends on speed.
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The electromagnet in a motor must rotate consistantly in just one direction to transfor. ectrical energy into mechanical energy. What causes this rotation?
The rotation of the electric motor in one direction is because the commutator frequently reverses the direction of the current in the loop of wire.
What is an electromagnet?An electromagnet is a device which works on the principle of electromagnetism.
Electromagnetism is the force produced due to an interaction of the electric and magnetic fields.
An example of an electromagnet is the electric motor.
In an electromagnet, the rotation of the motor in one direction is because the commutator frequently reverses the direction of the current in the loop of wire.
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Electromagnet in a motor must rotate consistently in just one direction because of the movement of permanent magnet.
What causes the rotation?
A Lorentz force is generated by the current and the magnetic flux of the permanent magnet in the same direction when the movement of the permanent magnet occur.
So we can conclude that Electromagnet in a motor must rotate consistently in just one direction because of the movement of permanent magnet.
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A loaded freight car a with a mass of 24,000 kg moves at a constant velocity of 8 m/s on a horizontal railroad track and collides inelastically with an empty stationary car b with a mass of 8,000 kg. after the collision the cars stick to each other and moves like one object. what is the velocity of two cars after the collision?
The velocity of two cars after the collision will be 6 m/sec.The momentum of the body is given by the product of the mass and velocity of the body.
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.
According to the law of conservation of momentum
Momentum before collision =Momentum after collision
[tex]\rm m_1v_1+m_2v_2=(m_1+m_2)V \\\\\ 24000 \ kg \times 8 m/sec+8000 \ kg \times 0 m/sec=(24000+8000)V\\\\ V= 6 m/sec[/tex]
Hence, the velocity of two cars after the collision will be 6 m/sec.
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The unit of length most suitable for measuring the thickness of a cell phone is a . The unit of length most suitable for measuring the height of a backyard tree is a?
The answers include the following:
The unit of length most suitable for measuring the thickness of a cell phone is a meter.The unit of length most suitable for measuring the height of a backyard tree is a meter.What is Meter?This is defined as the standard unit for measuring the length of a body and is denoted as m.
Height is a vertical type of length which is why meter was chosen as the most appropriate choice.
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A weather balloon is partially inflated with helium gas to a volume of 2.0 m³. The pressure was measured at 101 kPa and the temperature at 27 °C. What will be the new volume if the balloon is when it moves upwards to where the atmospheric pressure is 40 kPa and the temperature is at 10 °C?
Answer:
4.7 m³
Explanation:
We'll use the gas law P1 • V1 / T1 = P2 • V2 / T2
* Givens :
P1 = 101 kPa , V1 = 2 m³ , T1 = 300.15 K , P2 = 40 kPa , T2 = 283.15 K
( We must always convert the temperature unit to Kelvin "K")
* What we want to find :
V2 = ?
* Solution :
101 × 2 / 300.15 = 40 × V2 / 283.15
V2 × 40 / 283.15 ≈ 0.67
V2 = 0.67 × 283.15 / 40
V2 ≈ 4.7 m³
What mindset do you believe Einstein had while alive and what do you think the key component or constant action was for Einstein throughout his "miracle year"
Albert Einstein had a growth mindset due to innovative nature.
What mindset do you believe Einstein had?Albert Einstein had a growth mindset because he did not give up when he face failure. He was very good in math and science but did not get into the school. The reason behind is that Einstein is different from other students. The key component or constant action was focus and devotion to work for Einstein throughout his "miracle year".
So we can conclude that Albert Einstein had a growth mindset due to innovative nature.
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As waves approach the shore, they ________. Group of answer choices are reflected off the shoreline but never refract refract so as to impact the shore nearly perpendicular to the shoreline reflect directly backward from the angle at which they approach the shoreline refract so as to impact the shore in a nearly parallel manner
As waves approach the shore, they refract so as to impact the shore in a nearly parallel manner.
What is Water wave?This is a type of mechanical wave and requires a medium for its propagation which in this case is water.
This type of wave refract and impact the shore in an almost parallel manner hence option D being chosen.
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The source of all magnetic fields is:
- moving charges
- the earth's gravity
- the aurora borealis
- solar fields
Answer:
Moving charges
Explanation:
The source of all magnetic fields is moving electric charge: whether it is current in a wire, unpaired electrons in an atomic orbital, convection currents in the earth's liquid nickle /iron core, plasma in the sun, etc. moving electric charge is the source of all magnetic fields.
How will the force of friction affect a wood block being pushed over a table?
A. Friction acts in the direction of motion, speeding the block up.
B. Friction acts in the direction of motion and is included in the moving force.
C. Friction acts in the opposite direction of motion but does not affect the motion of the object.
D.Friction acts in the opposite direction of motion, slowing the block down.
Answer:
D
friction acts in the opposite direction of motion but does not affect the motion of the object
Answer:D.Friction acts in the opposite direction of motion, slowing the block down.
Explanation:
Question 9 of 25
Which term describes something that changes during an experiment?
OA Variable
OB. Vector
OC. Data
OD. Hypothesis
Answer:
C
Explanation:
Suppose x and y are distances of object and image respectively from a mirror. What shall be be the shape of the graph between 1/x and 1/y for a concave mirror ?
Answer:
The shape of the graph would be a circle
Explanation:
Because the mirror is concave , which it's inner part will be curved.
how can geo thermal energy be used ?
Answer:
Geothermal energy can heat, cool, and generate electricity: Geothermal energy can be used in different ways depending on the resource and technology chosen—heating and cooling buildings through geothermal heat pumps, generating electricity through geothermal power plants, and heating structures through direct-use
Explanation:
geothermal energy, form of energy conversion in which heat energy from within Earth is captured and harnessed for cooking, bathing, space heating, electrical power generation, and other uses. Heat from Earth's interior generates surface phenomena such as lava flows, geysers, fumaroles, hot springs, and mud pots.
In y = mx + b, the y-intercept is given by the value of m.
Answer:
False
Explanation:
In the linear equation y = mx + b, b is the y-intercept and mx is the slope.
Which best explains how the diffraction pattern observed in young’s experiment supports the wave theory of light?.
Answer: the airy pattern can only arise from wave propagation
Explanation:if particles went in straight lines through a slit, they would progate linearly and not interfere. The airy pattern arises from diffraction as waves interfere, producing peaks (constructive interference where peaks of waves from each slit coincide) and troughs (destructive interference where peaks and troughs of waves from each slit cancel out). If intensity rather than field is measured nodes occur where 0 values line up instead of troughs
Engineers are trying to improve a race car. Their goal is to increase the acceleration of the car using the same engine. Which change shows the best application of Newton’s laws of motion to achieve this goal?
increasing the inertia of the car
decreasing the reaction force
increasing the action force
decreasing the mass of the car
To increase the acceleration of the car using the same engine, the mass of the car must be decreased.
What is Newton's first law of motion
Newton's first law of motion states that an object at rest or uniform motion in a straight line will continue in that path unless acted upon by an external force.
The first law is also called the law of inertia because it depends on the mass of the object. The greater the mass, the greater the inertia and more reluctant the object will be to move.
Thus, to increase the acceleration of the car using the same engine, the mass of the car must be decreased.
a = F/m
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