The three rays in a ray diagram start from a single point on the object.
What is focal point of a lens?The focal point of a lens is the point where light rays parallel to the axis are brought to a point.
The focal point is responsible for the converging of light rays coming from the object but the rays do not start here.
Thus, the three rays in a ray diagram start from a single point on the object.
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Answer:
D
Explanation:
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:
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
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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Answer:
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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A track consists spring launcher on one end. A spring which is compressed 0.5 m has a
spring constant of 25 N/m. A 0.05 kg ball is resting at the end of the spring. When
released, the spring pushes the ball down the track. It collides and sticks to a second
block of 0.05 kg at rest.
(a) The velocity of the first ball before the collision with the second ball is 11.18 m/s.
(b) The final velocity of the two balls after the collision is determined as 5.59 m/s.
Speed of the block when pushed by the spring
The speed of the block when pushed by the spring is calculated as follows;
K.E = Ux
¹/₂mv² = ¹/₂kx²
mv² = kx²
v² = kx²/m
v² = (25 x 0.5²)/0.05
v² = 125
v = 11.18 m/s
Final velocity of the two balls after the collisionThe velocity of the two balls after the collision is calculated as follows;
Pi = Pf
where;
Pi is initial momentum Pf is final momentumm1u1 + m2u2 = v(m1 + m2)
0.05(11.18) + 0.05(0) = v(0.05 + 0.05)
0.559 = 0.1v
v = 5.59 m/s
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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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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
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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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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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 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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Air escaping out from an air hose at a gas station always feels cool. Why?
Answer:
The air is contained at a high pressure in the tube. When it escapes from a small orifice, it suddenly expands. A large amount of its heat is absorbed in the process of expansion resulting in considerable fall in its temperature. This is why the escaping air feels cold.
it is seen that in a balloon filled with air,if we press one side of the balloon the other side bulges out.why is it so???
When we apply pressure on the one side of balloon the other side bulges out due to the movement of gas to other side.
What happen when we press one side of the balloon?If we press one side of the balloon, the other side bulges out because the gas that present on one side moves to the other side where there is no pressure. The body of balloon is elastic so when we apply pressure the other side bulges out.
So we can conclude that when we apply pressure on the one side of balloon the other side bulges out due to the movement of gas to other side.
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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.
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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Question 9 of 25
Which term describes something that changes during an experiment?
OA Variable
OB. Vector
OC. Data
OD. Hypothesis
Answer:
C
Explanation:
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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A basketball, a pool cue ball, and a golf ball all fall down in the absence
of air resistance. Which of the following is true about their
acceleration?
The acceleration of all objects increases when there is no air resistance because air resistance slow down the speed of an object.
What is acceleration?
The rate of change in velocity over time is known as acceleration. Velocity is the speed of an object in a specific direction. Acceleration occurs when change occurs in velocity.
So we can conclude that the acceleration of all objects increases when there is no air resistance because air resistance slow down the speed of an object.
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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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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.
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!!
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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Find the magnetic field (positive magnitude only, no direction) at point p. i1 = 12.0 a r1=2.40 m i2 = 10.0 a r2 = 1.25 m
The magnetic field (positive magnitude only, no direction) at point p is further explained below.
B=1.89*10^{-6}
What is the magnetic field (positive magnitude only, no direction) at point p.?Generally, the equation for magnetic field is mathematically given as
[tex]B= \frac{\mu0}{2\pi}*\frac{I1}{r1}[/tex]
Therefore
[tex]B1= \frac{2*10^{-7}(10)}{240}[/tex]
B1=1*10^{-6}T
and
[tex]B2= \frac{2*10^{-7}(10)}{1.25}[/tex]
B2=1*10^{-6}T
In conclusion,
[tex]B=\sqrt{B1^2+B2^2}[/tex]
B=1.89*10^{-6}
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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
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
The voltage provides the push for an electric current within the electromagnet. What is your evidence that a magnetic field is also present
The evidence that a magnetic field is also present is the paper clips get attracted to the rod.
What is magnetic field?It is the region of space where an object experiences magnetic force either attracted or repelled.
The voltage provides the push for an electric current within the electromagnet. The paper clips placed nearby will get attracted towards the magnetic material rod.
Thus, this give an evidence that magnetic field is also present.
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What was the name of the first living being to be put into orbit?.
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.