Answer: The employee must do 11.2308 Joules of work
Explanation:
Work done = force × distance
But
Force = ma(mass x acceleration due to gravity)
F = 30×9.8
F = 294N
Also distance moved can be found using the equation
v² = u² +2gS
1.00 ² = 0.50²+2(9.8)S
1 =0.25+19.6S
1-0.25 =19.6S
0.75=19.6S
S=0.75/19.6
S = 0.0382m
Work done = force × distance = FS
Work done = 294 N X 0.0382m
Workdone =11.2308Nm = 11.2308 Joules
Work done required by the employee to do on the desk to change the speed to 1.00 m/s is 11.3 J.
What is work done?Work done is the force applied on a body to move it over a distance. Work done by a body can be given as,
[tex]W=Fd[/tex]
Here (F) is the magnitude of force and (d) is the distance traveled.
From the second law of motion, the force is product of mass time acceleration. Thus the above formula can be given as,
[tex]W=(ma)d[/tex]
For the gravitational acceleration, it can be written as,
[tex]W=(mg)d\\W=mgd[/tex]
The constant speed by which, the warehouse employee is pushing the desk across a floor is 0.50 m/s and the the final speed of the desk is 1 m/s.
Thus, the distance traveled by it can be find out using the third law of motion as,
[tex]v^2-u^2=2gd\\1^2-0.25^2=2\times9.8\times d\\d=0.0382\rm m[/tex]
As the mass of the desk is 30 kg and the distance moved is 0.382 meters. Thus, put the values in the above formula as,
[tex]W=30\times9.81\times0.0382\\W\cong11.3\rm J[/tex]
Thus the work done required by the employee to do on the desk to change the speed to 1.00 m/s is 11.3 J.
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How much voltage is required to run 0.054 A of current through a 15 2
resistor? Use AV = IR.
O A. 0.81 V
O B. 1.2 V
O c. 2.8x10²v
O D. 3.6 x 10-3 v
Answer:
The correct option is (a).
Explanation:
Given that,
Current flowing through the resistor, R = 0.054 A
Resistance of the resistor, R = 15 ohms
We need to find the voltage. We know that, Ohm's law gives the relation between voltage, current and resistance i.e.
V = IR
Put all the values,
[tex]V=0.054 \times 15\\\\V=0.81\ V[/tex]
So, the required voltage is equal to 0.81 volts.
Electric cables for your lamp have a plastic rubber coating around the wire. Explain why this material surrounds the metal cable.
This is 100 points
Answer:
theyre used to prevent accidental contact with other conductors of electricity, which might result in an unintentional electric current through those other conductors.
Explanation:
Metal cables are conductor of electricity but plastic rubber coating is insulator and can not conduct current. To avoid unnecessary flow of current and safely current transmission, this material surrounds the metal cable.
What are conductor and insulator?Materials that easily permit the flow of electricity are referred to be electrical conductors. Conductivity is the quality of conductors that enables them to conduct electricity.
Insulators are substances that prevent electrons from freely moving from one elemental particle to another. The charge stays in the same spot and does not spread across the surface if we transfer any quantity of charge to such an element at any time.
Copper, aluminum, gold, and silver are a few examples of common conductors. Wood, rubber, plastic, and glass are a few typical insulators.
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Answer those 2 questions.
What factors affect Kinetic Energy? a. Mass and Height b. Velocity and Time C. Mass and Velocity d. Mass and Time
What factors affect Potential Energy? a. Mass and Height b. Velocity and Time c. Mass and Velocity d. Mass and Time
Answer:
Q1: c
Q2: a
Explanation:
you can tell the factors by looking at the formulas for kinetic and potential energy
for question 1 look at the formula for kinetic energy
[tex]KE=\frac{1}{2} mv^{2}[/tex]
the variables needed in order to calculate an object's kinetic energy are mass and velocity.
hence, when mass and velocity changes, kinetic energy changes, showing that mass and velocity are the factors affecting kinetic energy
same thing for the second question
[tex]PE = mgh[/tex]
as g (acceleration due to gravity) is considered constant (10 [tex]m/s^{2}[/tex] ) it will not be considered as a factor
and thus, the factors affecting potential energy are mass and height
Describe how the energy is transferred from the gas hob to cook the egg in the water.
Answer:
remember the ways in which the heat is transferred:
Conduction: Heat transfer of two objects touching.
Convection: Heat transfer in a medium with a gradient of temperature.
Radiation: Heat transferred between two objects that not touch each other (an example of this is how the Sun heats up the Earth)
First, we start with the gas itself.
It has a lot of pressure, so when you open the knob, the gas can get out.
The has chemical potential energy.
When you combust the gas, you transform that energy into heat energy, as the flame touches the pot, it starts o also heat the pot.
This heat energy is transferred to the pot, which transfers heat energy to the water by conduction, the heat in the water is "distributed" by convection, and as the water starts to heat up, the energy is transferred to the egg by conduction.
You want to create a model that conducts electricity. Which material should you use?
A. Glass
B. Plastic
C. Wood
D. Copper
Answer:
D. Copper
Explanation:
Copper has the best electrical conductivity of any metal, except silver. A good electrical conductivity is the same as a small electrical resistance.
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Trevor is playing soccer and takes his heart rate. He realizes that it is ABOVE the target ceiling. What should Trevor do now
Answer:
He should do a cool down exercise
Explanation: not sure this is the answer your looking for :)
HELP THIS IS TIMED PLEASE OMG
Answer:
d) 40000 kgm/s
Explanation:
The formula for momentum is p = m*v
so p = 100*400
p = 40000 kgm/s
how dose storing waste underground can be effected by ground water in aquifers
Answer:
it can contaminate the water
Explanation:
I hope this helps ;)
Which of the following is the best
definition of tissue?
1 Pt
A
B
A. what organs are made of
B. your skin and muscles
C. parts of cells
D. a group of similar cells working together
E. None of the above
What effect does the Sun have on the ocean tides?
A.
The Sun does not have an effect on the ocean tides because it is
too far away.
B. The Sun warms the water, causing it to rise.
C. The gravitational pull of the Sun causes spring and neap tides.
D.the gravitational pull of the sun gravity is more powerful then the moons
Answer:
B
Explanation:
When the sun, moon, and Earth are in alignment at the time of the new or full moon, the solar tide has an additive effect on the lunar tide, creating extra-high high tides, and very low, low tides both commonly called spring tides.
A typical electromagnetic signal from a communications satellite might have an intensity of 0.600 pW/m2 at the surface of the Earth. Your satellite dish collects the energy of the electromagnetic signal from the satellite; then your dish passes that energy to its central receiver, where the signal can be processed by a circuit. The area of a satellite dish can be calculated from pi (3.1416) times the radius squared. If your satellite dish has a radius of 0.28 m, and if it is receiving the signal described above, how much electromagnetic energy is reflected to the central receiver in 2.5 minutes
Answer:
The answer is "22.05 pJ"
Explanation:
Using formula:
[tex]Energy=power\times time\\\\Power=Intensity \times area[/tex]
Calculating Energy:
[tex]=0.147 \times 2.5 \times 60 \times 10^{-12}\\\\=22.05\ pJ[/tex]
An object attached to one end of a spring makes 20 complete vibrations in 10s. Its frequency is:
O 2 Hz
.50 s
2 s
.50 Hz
Answer:
0.50 s
Explanation:
definition of mass number
Answer:
The total number of protons and neutrons in a nucleus.
Explanation:
I memorized it.
Answer:
Mass number of an atom is defined as the sum of the number of protons and number of neutrons.
5. A boy rides his skateboard 50 meters (m) West. Then he turns around
and goes 20 m East. What is the boy's DISPLACEMENT? *
Answer:
-30 m
Explanation:
50-20 but the direction is going west so it’s negative
Which objects generate magnetic fields? Choose more than one
answer.
Magnet
Electric wire with no
current
Electric wire with current
Electromagnet
Paper clip
Metal coin
magnets' persistent magnetic fields.Things that create their own persistent magnetic fields are known as permanent magnets.They have a north and a south pole and are built of magnetized ferromagnetic elements, such as iron and nickel.
More than one solution to the question "what causes a magnetic field?"
may be true.Charged particles that are in motion produce all magnetic fields.Due to the continually moving electrons inside, even the magnet on your refrigerator is magnetic. A magnetic field is produced along the axis of a wire loop by a current flowing through it.Curling the fingers of the right hand in the direction of the current through the loop and pointing the thumb in the direction of the magnetic field will reveal the direction of the field inside the loop. The magnetic field strength of an electromagnet or solenoid, depends on the number (N) of coil turns, the strength of current flowing through the coil in amperes, and its length L. This gives us: H = (NI)/L where NI represents the ampere-turns value.Items made of iron, cobalt, nickel, and steel are drawn to magnets.Paperclips are magnetic because they are often constructed of galvanized steel wire. Any of the following techniques can create a magnetic field:I Any type of magnet, including round, horseshoe, and bar magnets, may be employed.(ii) A current-carrying wire generates a field all around it.(iii) A current-carrying loop or solenoid Electric charges in motion are what generate magnetism.The smallest building blocks of matter are called atoms.There are electrons in every atom, which are charged particles.The electrons that make up an atom's nucleus, or core, spin like tops. Ampere noted that whenever an electrical charge is moving, a magnetic field is created.Similar to how an electrical current flowing through a wire creates a magnetic field, the spinning and circling of an atom's nucleus accomplishes the same.The magnetic field's orientation is determined by the spin and orbit directions. There are only two ways to create a powerful magnetic field.In the first, a solenoid is used, whereas in the second, a solenoid with an iron core is used. Magnetic materials found in nature are connected to magnetic fields.Instead of static charges, a magnetic field can be produced by moving charges.F = QVB, where Q is the charge and V is the charge's velocity perpendicular to the field B, describes the force acting on moving charges in a magnetic field.To learn more about magnetic field refer
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Which choice is the BEST source of PROTEIN?
1 Meat
2 Bread
3 Rice
4 Apples
Answer: It's 1 meat.
Explanation: Meat is a protein, bread and rice are grains, Apples are fruit!
Your welcome
Another child is on a swing next to the first. This child has a mass of 48 kg and a maximum kinetic energy of 3800 J. What is the velocity of this child?
Answer:12.583m/s
Explanation:
[tex]KE=\frac{1}{2}mv^{2}[/tex]
[tex]3800=\frac{1}{2}(48)v^{2}[/tex]
[tex]\frac{3800}{24}=v^{2}[/tex]
[tex]\sqrt{158.33} = v\\12.583m/s=v[/tex]
Water tends to moderate climate. Why is it warmer in the winter and cooler in the summer in cities located near the ocean or large lakes?
A.Water has a low specific heat and therefore changes temperature faster than most other substances.
B.Water has a low specific heat and therefore changes temperature slower than most other substances.
C.Water has a high specific heat and therefore changes temperature more slowly than most other substances.
D.Water has a high specific heat and therefore changes temperature more quickly than most other substances.
It is warmer in the winter and cooler in the summer in cities because water has high specific heat and therefore changes temperature more slowly than most other substances. The correct option is C.
What is climate?Climate is the average weather over a longer period of time in a particular area. A description of a climate includes details such as the typical temperature in each season, the amount of rainfall, and the amount of sunshine.
Coastal weather tends to be more moderate than continental weather, with fewer hot and cold extremes, because the ocean warms and cools more slowly than the atmosphere.
The majority of rain clouds are produced by ocean evaporation, particularly in the tropics, which affects where wet and dry regions on land are located.
Therefore, the correct option is C. Water has a high specific heat and therefore changes temperature more slowly than most other substances.
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endothermic vs exothermic question. please help!
Answer:
i dont know the answer sir !
Explanation:
what is conservation of energy in physics?
Answer:
https://www.khanacademy.org/science/physics/work-and-energy/work-and-energy-tutorial/a/what-is-conservation-of-energy
Explanation:
Look at this website it gives you all the details! :)
Pedro is planning to model how changes in weather affect evaporation from lakes. For his first experiment, he wants to test how humidity affects the evaporation rate. He places one beaker with 300 mL of water in a dry area, and he places another beaker with 300 mL of water near a humidifier. Which of the following variables does Pedro need to control during his experiment?
The aim of the experimental model is to test the effect of humidity (changes in weather) on evaporation (rates) from lakes
The control variables in an experiment are the variables that the experimenter intends to keep constant always so as to limit their effect on the measurements of the relationship between the dependent and the independent variable
Therefore in order to have a proper measurement of the effect of humidity on evaporation rate, other variables such as temperature, and the volume of the water in the experiment investigations which affect evaporation rate by the provision of heat, (temperature) and their heat capacity, (the volume and therefore, mass of water) should be controlled
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Answer: B: Volume of water and temperature
Explanation:
Just took the quiz
I REALLY NEED HELP!!
The velocity of a car increases from +4.0 m/s to +16.0 m/s
in a time period of 4.0 s. What was the average
acceleration?
Answer:
Explanation:
Although we do have an equation for this in terms of one-dimensional motion, it's easy enough just to use the mathematical definition of acceleration:
[tex]a=\frac{v_f-v_0}{t}[/tex] which says, in words, the acceleration of an object is equal to the objects final velocity minus its initial velocity, divided by the change in time. Since everything is given in m and s, our answer will be in m/s/s:
[tex]a=\frac{16.0-4.0}{4.0}[/tex] and
[tex]a=\frac{12.0}{4.0}[/tex] so
a = 3.0 m/s/s
According to ohms law, as the voltage increases across a 40 ohm resistor what happens to the current, resistors, and resistance
Answer:
As the voltage increases, the current flowing through the circuit increases while the resistance of the resistor remains constant.
Explanation:
Ohm's law states that the current flowing through a circuit is directly proportional to the applied voltage.
V = IR
where;
I is the current
R is the resistance
V is the applied voltage
Based on this law (Ohm's law), as the voltage increases, the current flowing through the circuit increases while the resistance of the resistor remains constant.
HELP ME PLEASEeeeeèeeeee
9514 1404 393
Answer:
5) 0.64Ω
6) 0.16 W
Explanation:
Put the given numbers into the given formula and do the arithmetic.
5)
[tex]\text{ohms}=\dfrac{\text{volts}}{\text{amps}}=\dfrac{0.32\text{ V}}{0.50\text{ A}}=\boxed{0.64\ \Omega}}[/tex]
__
6)
[tex]\text{watts}=\text{volts}\times\text{amps}=(0.32\text{ V})\times(0.50\text{ A})=\boxed{0.16\text{ W}}[/tex]
Answer:
just ok02
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Choose all that apply about the earths crust
1. thickest layer
2. thinnest layer
3. densest layer
4. least dense layer
5. home to all life
6. home to most life
6. made of hot soft rock
I will give brainliest
Can someone Please help me ?
Which is one use of lasers
A. reproducing images to make them clearer
B. Producing a magnified image of the moon
C. Cutting an iron bar into two pieces
D. Making a leaf appear larger so it’s veins are visible
Answer:
c
Explanation:
because what else can the laser be used for
A commercial jet liner takes off with an average acceleration of 3 g. How long does it take to reach the end of its runway which is 1524 meters away?
Answer:
The time taken for the commercial Jet liner to reach the end of its runway is 10.18 s.
Explanation:
Given;
average acceleration of the commercial Jet liner, a = 3g = 3 x 9.8 m/s² = 29.4 m/s²
distance traveled by the commercial Jet liner, s = 1542 m
The time taken for the commercial Jet liner to reach the end of its runway is calculated as follows;
s = ut + ¹/₂at²
where;
u is the initial velocity of the commercial Jet liner = 0
s = 0 + ¹/₂at²
s = ¹/₂at²
2s = at²
[tex]t = \sqrt{\frac{2s}{a} } \\\\t = \sqrt{\frac{2 \times 1524}{29.4} } \\\\t = 10.18 \ s[/tex]
Therefore, the time taken for the commercial Jet liner to reach the end of its runway is 10.18 s.
The thermal transfer of energy through a copper rod involves electrons. A second process is also involved.
Answer:
hello your question is incomplete attached below is the complete question
answer : Conduction, Lattice vibration ( B )
Explanation:
The thermal transfer of energy occurs in a solid like a copper rod following two process therefore the second process and method are
Lattice vibration and conduction
Lattice vibration is the movement/oscillation of atoms in a solid and this is caused by the change/increase in temperature applied to the solid and these vibrations will lead to the thermal transfer of energy via conduction since the atoms are bounded together .
Heat flows into a gas in a piston and work is performed on the gas by its surroundings. The amount of work done is equal to the heat added. In this situation,
Answer:
The Internal energy of the gas did not change
Explanation:
In this situation the Internal energy of the gas did not change and this is because according the the first law of thermodynamics
Δ U = Q - W ------ ( 1 )
Δ U = change in internal energy
Q = heat added
W = work done
since Q = W. the value of ΔU will be = zero i.e. No change
