Let there be light! At the flick of a switch, a light bulb can light or illuminate an entire room, but what else is happening? One the basic laws of physics, the conservation of energy, tells us that energy is neither created nor destroyed: rather, it can only be transformed from one form to another. In the case of the light bulb, electrical energy is being transformed into light and thermal (heat) energy. Different wattages and types of bulbs give off varying amounts of light and heat. In this light bulb science project, we'll be working with incandescent and compact fluorescent lamp bulbs (CFL’s).
On average, how many lunar eclipses are there every year?.
Answer:
Three lunar eclipses every year.
Explanation:
A lunar eclipse only occurs during a full Moon, when the Sun, Earth and Moon are all aligned. But despite the Moon only taking 29.5 days to orbit Earth and complete a cycle from full Moon to full Moon, there are only on average about three lunar eclipses every year.
Who was the highest deity in the Shang religion?
A.
Di
B.
Laozi
C.
Shihuangdi
D.
Confucius
Answer:
Shangdi or A: Di
Explanation:
Shangdi was considered to be the supreme deity during the Shang dynasty (1600–1046 century BCE), but during the Zhou dynasty (1046–256 BCE) he was gradually supplanted by heaven (tian).
At which point is potential energy greatest?
Answer:
when the most energy is stored
Mr Hules is making cookies for his family. A recipe for 24 cookies calls for 4 cups of sugar for every 6 cups of flour. How many cups of flour will he use if he needs to make 60 cookies?
I need the step by step process to
Answer:
15 cups of flour to make 60 cookies
Explanation:
first, do 60 divided by 25.
then we MULTIPLY the recipe by 2.5
24x2.5=60 amount of cookies
4x2.5=10 cups of sugar
6x2.5=15 cups of flour
15 cups of flour to make 60 cookies
:DDD
Answer:
15 cups of flour
Explanation: 60 times 6 = 360
24x=360
360 divided by 24 is 15.
Students want to make a scale model of the Earth and Moon system that shows correctly-scaled sizes and distances. Here are some guidelines they have to follow.
It has to be shown in the classroom, and the classroom is 51 square meters in area.
It has to be easily moved around since orbital motion and rotations will be shown.
It cannot cause damage if it is dropped.
All the students in the class should be able to see it from their desks.
Four different students came up with different designs. The designs and characteristics are shown in the table below.
Which design best satisfies the criteria and constraints of this Earth-Moon model?
A.
design 1
B.
design 3
C.
design 2
D.
design 4
Answer:
Design #3 seems to best fit the requirements (2 sq m).
The others are too bulky.
Determine the quantity of charge on a plastic tube which has been rubbed with animal fur and gained 3.8 x 10^9 electrons
The quantity of charge carried by the plastic tube is -6.08 x 10^-10 C.
What are electrons?Electrons are negatively charged particles that are found in the atom. The magnitude of charge carried by an electron is about -1.6 × 10^-19 C. We must note that the negative sign indicates that the electron is negatively charged.
The quantity of charge carried by the tube is obtained from;
q =ne
q = 3.8 x 10^9 × ( -1.6 × 10^-19 C)
q = -6.08 x 10^-10 C
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What energy of light's photon gives a maximum kinetic energy of 1.62 eV to the photoelectrons ejected from a gold surface?(given: The work function for gold is 4.58 eV)
What exerts pressure in all directions?
Answer: Gases
Explanation: Gases don't have a certain direction, so they go in all directions.
A pendulum is observed to complete 23 full cycles in 58 seconds. Determine the period and
the frequency of the pendulum.
1
Answer:
Frequency=0.39Hz
Explanation:
A pendulum completes 23 full cycles in 58 seconds
A pendulum completes 1 full cycle in 58/23=2.52 seconds
Time taken(t)=2.52 seconds
Now,
Frequency=1/time taken
Frequency=1/2.25
Frequency=0.39Hz
When a pendulum is observed to complete 23 full cycles in 58 seconds. then the period is 2.521739 and the frequency of the pendulum is 0.39655 S⁻¹
What is the frequency?It can be defined as the number of cycles completed per second.It is represented in hertz and inversely proportional to the wavelength.
The frequency of a pendulum is the reciprocal of the time period can be given by the following relation
f = 1/T
where f is the frequency
T is the time period of the pendulum
As given in the problem that a pendulum is observed to complete 23 full cycles in 58 seconds
Then the number of cycles per second is known as the frequency
f = 23/58
f = 0.39655 S⁻¹
As the time period is reciprocal to the frequency
T= 1/f
T = 1/0.39655
T =2.521739
Thus, if 58 seconds pass before a pendulum completes 23 full cycles. then the pendulum's frequency would be 0.39655 S⁻¹, and its period would be 2.521739.
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According to current scientific estimates, when did the big bang occur?.
Answer:
13.8 billion years ago
Explanation:
Use the picture to identify the part of a wave.
What is D?
Wait what do you mean what is D? I have no idea what your talking about. Well um... D is the fourth letter or the alphabet.
I have anxiety btw so i don't want to be warned it makes me feel weird or scared.
Identifying Independent and Dependent Variables in Experiments
Answer:
The easiest way to identify which variable in your experiment is the Independent Variable (IV) and which one is the Dependent Variable (DV) is by putting both the variables in the sentence below in a way that makes sense.
“The IV causes a change in the DV. It is not possible that DV could cause any change in IV.”
Explanation:
the moon revolves around the earth in a
nearly circular orbit kept tere by the gravitational force exerted by the earth what does the gravity do?
Answer:
Gravity does no work on the Moon
Explanation:
Humans selectively breed cows that produce more meat or milk. This selection is not necessarily helpful
to increase their survival rate. They are just selecting a desirable characteristic. How can growing one
variety affect cows population over many generations?
There will be less genetic diversity in the population.
The cows will produce less milk or less meat over generations.
The cows will be able to survive for a longer time.
There will be more genetic diversity in the population.
Answer:
The cows will produce less milk or less meat over generations.
A toy car has a 1. 5 A current, and its resistance is 2 Ω. How much voltage does the car require? V.
Answer: Voltage = (current) x (resistance)
Voltage = (1.5 A) x (2 ohms)
In order to MAKE 1.5 A of current flow through the toy car, you have to PROVIDE 3 volts from the battery.
A 10cm long ,2cm wide wooden wedge is pushed into a soft wood block .calculate :a,velocity ratio of the wedge b,the load on the soft wood if the effort applied is 30N
The velocity ratio of the wedge is 0.1
The load on the soft wood is 300 N.
Velocity ratio
The velocity ratio of a machine is the ratio of the distance traveled by effort to distance traveled by load.
V.R = distance traveled by effort/distance traveled by load
Let 1 cm of the wood's width = towards rightthen another 1 cm = towards leftV.R = 1 cm/ 10 cm = 1/10 = 0.1
Load on the soft woodThe load on the soft wood is calculated as follows;
[tex]\frac{30}{L} = 0.1\\\\L = \frac{30}{0.1} = 300 \ N[/tex]
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What is the new velocity of a 1140 kg car that was traveling at 13.6 m/s and slams on the brakes losing 5000J of energy?
Answer:
13.3 m/s
Explanation:
KE = 1/2 m • v^2
KE = 1/2 • 1140 kg • (13.6m/s )^2
KE = 105427.2 J
KE after brakes are slammed = 105427.2 J - 5000 J
KE after brakes are slammed = 100427.2 J
100427.2 J = 1/2 • 1140 • v^2
v = (100427.2 J • 2 / 1140 kg)^1/2
v = 13.3 m/s after adjusting for significant figs
I’m in 8th grade and don’t know how to find m/s^2. Or acceleration from Force and mass can someone help me.
How far will an object go if it is moving at a speed of 55 km/hr, and moves for 6.3 hours?
Answer:
346.5 km
Explanation:
to find distance- multiply speed by time
so 55×6.3= 346.5 km
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Calculate the acceleration if you push with a 6 N horizontal force on a 8 kg block on a
horizontal friction free air table.
What is the momentum of a golf ball with a mass of 62 g moving at 73 m/s?
Explanation:
Momentum = mass × Velocity
p = 62×73
p =4526
If the truck has a mass of 2,500 kilograms , what is its momentum ? (V=45m/s) Express your amswer
Answer:
The answer is 2,500 * 45 = 112500kgm/s
Which phenomenon do solar panels rely on to produce electricity from sunlight?
Answer:
When the sun shines onto a solar panel, energy from the sunlight is absorbed by the PV cells in the panel. This energy creates electrical charges that move in response to an internal electrical field in the cell, causing electricity to flow.
Answer:
When the sun shines onto a solar panel, energy from the sunlight is absorbed by the PV cells in the panel. This energy creates electrical charges that move in response to an internal electrical field in the cell, causing electricity to flow.
Explanation:
If identical spacecraft were orbiting Mars and Earth at identical radii (distances), which spacecraft would be moving faster
Answer:
a = G M / R^2 gravitational acceleration
a = ω^2 R acceleration due to centripetal force
a2 / a1 = ω2^2 / ω1^2 the one with the greatest gravitational acceleration would require the greatest speed
a2 / a1 = M2 / M1 using the first equation - since M is greater for earth - then the spacecraft for earth would be moving faster - using the term radii as distance from center
Note that the acceleration of an object at the surface for Mars is less that on-half of that of earth - so at zero height above the surface the spacecraft on earth would still be moving faster
An insulated lunch bag keeps food warm by
increasing the thermal energy of the lunch bag.
increasing the thermal energy of the food.
slowing the transfer of thermal energy from the air outside the bag to the food inside the bag.
slowing the transfer of thermal energy from the food inside the bag to the air outside the bag.
Answer:
slowing the transfer of thermal energy from the food inside the bag to the air outside the bag.
Explanation:
Answer:
D
Explanation:
slowing the transfer of thermal energy from the food inside the bag to the air outside the bag.
PLEASE HELP!!
A toy truck has a speed of 2 m/s and kinetic energy of 30 J. What is its mass?
A. 10 kg
B. 15 kg
C. 5 kg
D. 20 kg
You and your team of expert engineers are to improve the safety of a section of highway roadway. This is a flat concrete road surface. It is used both by passenger cars (1200 kg) and trucks ( 36,000 kg). The present velocity limit is 15.64 m/s and the radius of turn is 110 m.
The Normal force of each vehicle.
The normal force of the passenger cars is 11,760 N.
The normal force of the trucks is 352,800 N.
What is normal force?
The normal force of an object is the upward force of the object due to its weight acting downwards.
The normal force of the passenger carsThe normal force of the passenger cars is calculated as follows
Fₙ = mg
Fₙ = 1200 x 9.8
Fₙ = 11,760 N
The normal force of the trucksThe normal force of the trucks is calculated as follows;
Fₙ = mg
Fₙ = 36,000 x 9.8
Fₙ = 352,800 N
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What would the equipotential lines look like for an infinitely long line charge coming into and out of the paper
The equipotential lines round the infinitely long line of charge are concentric circles round the line of charge.
Equipotential lineAn equipotential line is a line in which the electric potential is constant
Since the electric field of an infinitely long line of charge is perpendicular to the line of charge. At a given distance from the infinitely long line of charge, the electric field is constant. The electric field is constant within a circle round the line of charge. This circle round the line of charge is an equipotential line.So, equipotential lines round the infinitely long line of charge are concentric circles round the line of charge.
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A car that weighs 40,000 N is driving down a hill at a constant velocity. If the car’s momentum is 80,000 kg∙m/s, how fast is the car moving?
The velocity of the car is equal to 20 m/s.
Given the following data:
Weight of car = 40,000 Newton.Car’s momentum = 80,000 kg∙m/s.Scientific data:
Acceleration due to gravity = 10 [tex]m/s^2[/tex].To determine the velocity of the car:
How to determine the car's velocity.First of all, we would calculate the mass of the car by using this formula:
[tex]Weight = mg\\\\40000=m \times 10\\\\m=\frac{40000}{10}[/tex]
Mass, m = 4,000 kg.
For the velocity:
Mathematically, momentum is giving by this formula;
[tex]Momentum = mass \times velocity[/tex]
Making velocity the subject of formula, we have:
[tex]Velocity = \frac{Momentum}{Mass}[/tex]
Substituting the given parameters into the formula, we have;
[tex]Velocity = \frac{80000}{4000}[/tex]
Velocity = 20 m/s.
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Help a brother out pleaseeeeew