The efficiency of the lever is 93%, calculated by comparing the output work to the input work. 7 joules of the input work are lost as heat.
The efficiency of the lever is determined by comparing the output work to the input work. In this case, the efficiency can be calculated using the formula:
Efficiency = (Output Work / Input Work) X 100%
Substituting the given values:
Efficiency = (93 J / 100 J) X 100%
Efficiency = 93%
The amount of work lost as heat is the difference between the input work and the output work, which can be calculated as:
Heat lost = Input Work - Output Work
Heat lost = 100 J - 93 J
Heat lost = 7 J
Therefore, 7 joules of the work input are lost as heat.
Which port is used to transmit slow data over long distances?
Suppose you lived in a pre-industrial society and needed to lift a heavy (20 kg) block a height of 5 m and had two choices for how to accomplish your task: You could use a lever with a short arm of 1 m and a long arm of 10 m. You'd place the block on the end of the short arm and apply force at the very end of the long arm. You could use a ramp with a length of 8 m and place the block on a cart with wheels. Which choice would you make? Be sure to discuss differences between the effort force of the two options in your answer.
Which of the statements about elements is true?
A) The atoms of all elements have different mass, but same volumes.
B) The atoms of all elements have the same mass and volume.
C) Scientists have identified a little less than 100 elements.
D) No two elements have the same kind of atom.
What happens when light rays pass through a converging lens (convex lens)?
How is understanding reactivity helpful for making jewelry?
which of the follow has no effect on the strength of the magnetic field around a current-carrying coil of wire?
a. The number of turns of a wire in the coil
b. the thickness of the wire
c. current flowing through the coil
d. the material of the core placed in the coil
Their is no such dependency on material of the core placed in the coil
What is magnetic field around a current carrying coil of wire ?When a current flows in a conducting material , it constitutes a magnetic field around it in a circular motion.
Magnetic field around a current-carrying coil of wire depend upon
a) Number of turns of wire in the coil as the number of turns increases
magnetic field also increases .(Directly proportional)
b) The thickness of the wire , as radius increases magnetic field decreases
(Inversely proportional)
c) current flowing through the conductor as magnitude of current increases magnetic field will also increase (directly proportional)
d) their is no such dependency on material of the core placed in the coil
hence correct answer option d)the material of the core placed in the coil
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. Alfonso pushes a box on a well waxed (frictionless) floor to the right with a 20 N force causing it to accelerate at 1.5 m/s2 . What is the mass of the box?
Answer:
The answer is m = 13.33Kg
Step by Step Explanation:
1- Taking into account Newton's second law (also known as the fundamental law of dynamics) we know that force is directly proportional to the mass and acceleration of a body.
2- This law is represented by the formula f = m.a where (f) represents force, (m) mass and (a) acceleration.
3- Having this formula, we can clear the mass (m) and replace the data given in the problem.
f = m.a
[tex]m = \frac{f}{a} \\m = \frac{20N}{1.5m/s^{2} } \\m = 13.33 kg[/tex]
Which of the following increases the speed of waves in a stretched elastic cord?
how would you describe the shape of the trajectory of a projectile
Which is an example of radiation?
A. An ice pack is placed on a knee, and the knee cools down.
B. A rock is warmed by an ultraviolet heat lamp.
C. Hot coffee in a mug causes the mug to warm up.
D. Cold salt water sinks to the bottom of the ocean.
An example of radiation is that a rock is warmed by an ultraviolet heat lamp. Thus, the correct option is B.
What is Radiation?Radiation may be defined as the process of emission of energy in form of waves that originated from a source and travels through space at the speed of light.
Radiation actually occurs in close association with the waves of atmospheric air.
An ice pack that is placed on a knee, Hot coffee in a mug, and Cold salt water sinks do not provide any space for the entrance of atmospheric air.
Therefore, an example of radiation is that a rock is warmed by an ultraviolet heat lamp. Thus, the correct option is B.
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How long will it take to travel 200 km traveling 100m/s?
How many electrons are in an Sn+2 ion?
Sn is Tin which has 50 atomic number
it means it has 50 electrons in its outer shells
+2 shows its valency
plus sign comes when electrons are removed from an atom
so here 2 electrons are removed from Sn atom
remaining electrons are 50-2
48 electrons
A radio wave wavelength is shorter than visible light. True or False.
A series of ocean waves are moving past a surfer at a frequency of 25 waves per hour. approximately how many waves should the surfer expect during 45 minutes?
You are given a transformer pictured below. what is the current through the secondary coil, if the number of turns in the primary coil is 86, the number of turns in the secondary coil is 85, the load resistance is 19 ohms, and the voltage input to the primary coil is 36 volts? you can assume that r1 has negligible resistance and that the transformer is ideal. give your answer in milliamps (non-negative & 3 significant digits).
Final answer:
The current through the secondary coil of the given ideal transformer is calculated to be 3281.7 milliamps using the transformer equations and the provided values of primary voltage, turns ratio, and load resistance.
Explanation:
To calculate the current through the secondary coil of an ideal transformer, we need to use the transformer equations:
The voltage transformation ratio is given by:
V
p
/ V
s
= N
p
/ N
s
Where Vp is the primary voltage, Vs is the secondary voltage, Np is the number of turns in the primary coil, and Ns is the number of turns in the secondary coil. Given that the transformer is ideal, the power on both sides is equal, therefore:
P = V
p
× I
p
= V
s
× I
s
To find the secondary current (Is), we rearrange the power equation to solve for Is:
I
s
= P / V
s
Using Ohm's law (V = IR), we can find the secondary voltage (Vs) which is the voltage across the load resistance (R):
V
s
= I
s
× R
Combining the two sets of equations, we have:
V
p
/ (I
s
× R) = N
p
/ N
s
The primary voltage (Vp) is given as 36 volts, the primary turns (Np) are 86, the secondary turns (Ns) are 85, and the load resistance (R) is 19 ohms.
Solving for Is, we get:
I
s
= (N
s
/ N
p
) × (V
p
/ R)
Is = (85 / 86) × (36 V / 19 Ω)
Is = 1.732 × 1.895
Is = 3.2817 A
Since the question asks for the answer in milliamps:
Is = 3281.7 mA
The current through the secondary coil is thus 3281.7 milliamps.
On the surface of planet y, which has a mass of 4.83x1024 kg, a 30.0 kg object weighs 50.0 n. what is the radius of the planet?
If the force between two fixed Charged spheres is F and you triple the charge on one sphere and also triple the distance between the spheres, what fraction/multiple of original force of attraction is now between the two spheres?
Which demonstrates conduction?
-A marshmallow held over fire?
-I cream melting in the sun?
-Cool feet walking across the hot pavement?
-A bulb releasing light energy?
Answer:
ITS C
Explanation:
hope that helps :)
A(n) a0 is software that contains rows and columns used to make calculations, organize information, and make comparisons.
A spreadsheet is software that is essential for performing a variety of tasks involving the organization and manipulation of data. It consists of multiple rows and columns that together create a grid, where data is stored and calculations can be made.
Each box, known as a cell, can hold individual pieces of data including text, numbers, and formulas. For instance, in Microsoft® Excel, a highly popular spreadsheet application, columns are identified with letters and rows with numbers. A cell at the intersection of column B and row 3 would be labeled as B3. Spreadsheets are widely used across different fields for data analysis, mathematical calculations, and information management.
When it comes to matrix algebra, spreadsheets also provide functionality to handle matrices, which are arrays of numbers arranged in rows and columns. The operations performed on matrices in a spreadsheet can range from basic arithmetic to more complex functions such as matrix multiplication or inversion.
Moreover, spreadsheets allow users to create charts, a visual representation of their data, making it easier to spot trends and patterns. Overall, spreadsheets are versatile tools that serve as an indispensable asset in both educational and professional settings.
A- AC motor
B- brush motor
C- DC motor
D- magnetic motor
E- spilt ring motor
Answer:
C. DC motor
Explanation:
DC motor is an electrical machine which converts DC electrical current into mechanical energy. Generally DC motors work on the forces produced by magnetic fields. Here(in the given diagram) stater is made from the permanent magnets in which magnetic rotor rotates. The rotating magnetic field interacts with stater's permanent magnet and generate torque which rotates armature.
Which of these is most likely a step in the formation of soil? a. erosion of soil b. crystallization of rocks c. animals digging rocks d. solidification of organic matter
It's B! I already took the test
A 80-cm-wide object seen through an optical device appears inverted and 50 cm wide. What is the magnification of the optical device?
A. 1.3
B. 0.63
C. -0.63
D. 2.5
E. -1.3
The power rating of a vacuum cleaner is 0.8 kilowatts. If you use the vacuum cleaner for 2.5 hours, how much energy does it use?
The chart below shows the amount of coal mined in four different states of USA in the year 2005.
State Amount of coal mined (in billion tons)
West Virginia 37
Wyoming 68
Montana 120
Illinois 78
In which state was the greatest amount of coal mined in 2005?
Illinois
Montana
Wyoming
West Virginia
Answer:
The answer is Montana...
Explanation:
Because it says 120 coal are mined in 2005...
So, thats why Montana is it...
Hope this helps.....
Gretta has a sample of soil. She wants to know what its porosity is. How could she test the soil's porosity?
A. Measure the time it takes water to make it through the soil when placed in a funnel.
B. Measure the mass of the soil and then measure its volume.
C. Measure the soil's volume and then the volume of water that the soil can absorb.
D. Measure the amount of water that evaporates from the soil in one hour.
Answer: C. Measure the soil's volume and then the volume of water that the soil can absorb.
Soil porosity can be defined as the amount of pores or air spaces present inside the soil mass. These pores forms due to the movement of roots, earthworms and insects inside the soil. These pores helps in aeration of the soil and water retention. Both of these factors helps in the growth of the plants.
Porosity can be judged by the measuring the soil's volume and then the volume of water that the soil can absorb. The volume of water found in the soil will depend upon the amount of pores present in the soil hence, reflecting the porosity of the soil.
20 POINTS TOTAL PLEASE HALP
The same force is applied to two skateboards. One rolls across the room and the other moves a few feet and comes to a stop. Where was there more work done?
one skateboard = rolls across the room
second skateboard = moves a few feet
the second skateboard is the one who worked more. there was more friction on the ground in which the skateboard couldn't glide across the room like the first one. friction is a force. the skateboard had to work harder to move across the room because of friction.
in other words, it's the skateboard that did NOT roll across the room worked harder
If a tuning fork has 75 Hz, how many cycles per second does it vibrate?
Answer:
N = 75 cycles per second
Explanation:
As we know that frequency is defined as the number of cycles per second
so here we can say that frequency is same as the number of cycles per second
so here given that
[tex]frequency = 75 Hz[/tex]
so here we have
Number of cycles per second = 75 Hz
What is the momentum of the system after the collision?
0.0 kg • m/s
0.2 kg • m/s
0.3 kg • m/s
0.4 kg • m/s
Answer: The momentum of the system after the collision is 0.2 kg m/s.
Explanation:
According to the conservation of momentum, the total momentum of the system before the collision is same the total momentum of the system after the collision in an isolated system.
[tex]m_{1}u_{1}+m_{2}u_{2}=m_{1}v_{1}+m_{2}v_{2}[/tex]
Here, m_{1},m_{2} are the first and second object, v_{1},v_{2} are the initial velocities of the first and second objects and u_{1},u_{2} are the final velocities of the first and the second objects.
Use the formula of the conservation of the momentum.
[tex]m_{1}u_{1}+m_{2}u_{2}=m_{1}v_{1}+m_{2}v_{2}[/tex]
Put m_{1}=0.6 kg, m_{2}=0.5 kg, v_{1}=0.5 m/s and v_{2}=-0.2 m/s.
[tex]m_{1}u_{1}+m_{2}u_{2}=(0.6)(0.5)+(0.5)(-0.2)[/tex]
[tex][tex]m_{1}u_{1}+m_{2}u_{2}[/tex]= 0.2 kg m/s[/tex]
Therefore, the momentum of the system after the collision is 0.2 kg m/s.
Answer:
0.2
Explanation:
took the quiz
what are two ways you can change atomic mass
Atomic mass can be changed by the nuclear reactions which are nuclear fission and nuclear fusion.
What are nuclear reactions?There are two types of nuclear reactions which are nuclear fusion and nuclear fission .They involve the combination and disintegration of the element's nucleus respectively.
In nuclear fission, the nucleus of the atom is bombarded with electrons of low energy which splits the nucleus in to two parts .Large amount of energy is released in the process.It is used in nuclear power reactors as it produces large amount of energy.
In nuclear fusion,on the other hand, is a reaction which occurs when two or more atoms combine to form a heavy nucleus.Large amount of energy is released in the process which is greater than that of the energy which is released in nuclear fission process.
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Which of the following is NOT benefit of stretching?
A. Poor circulation
B. Increased speed and power
C. increased flexibly
D. Minimized chances of injuries
Answer: A. Poor circulation
Explanation:
Stretching is a kind of physical activity which involves a specific muscle activity. In this the muscles are stretched to the maximum so as to increase the stamina and flexibility of the muscle fibers. It is done to achieve a desire muscular motion.
Among the given options, the poor circulation is correct. As the stretching process will restrict the flow of the blood in blood vessels due to stretching of muscles.
Option (A) is correct. The poor circulation is not considered as a benefit of stretching.
Explanation:
The stretching is considered to be the warming up exercise that increases the energy of the body and help the body in getting ready for the task to be performed.
The stretching helps the body to gain the sufficient amount of energy and also helps the body the be prepared for doing anything that requires a bit of higher amount of energy than the normal.
Therefore, stretching can be referred to as the exercise that helps in increasing the speed and the energy output of the body. It is also regarded as the exercise that helps in increasing the flexibility of the body.
After stretching, since the flexibility of the body is increased. There are less chances of the body facing any injury. So, stretching also reduces the chance of injury.
The stretching increases the energy of the body. Therefore, it will also increase the rate of circulation in the body.
Thus, Option (A) is correct. The poor circulation is not considered as a benefit of stretching.
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Answer Details:
Grade: High School
Subject: Physics
Chapter: Exercise and energy
Keywords:
Circulation, blood, poor, energy, speed, increase, power, exercise, stretching, warm up, flexibility, injury, reduce, benefit.