A typical jar that has been tightened to a reasonable degree requires 2.0 N⋅m to open. If you grab a 8.2-cm-diameter jar lid with one hand so that your thumb and fingers exert equal magnitude forces on opposite sides of the lid, what is the magnitude of each of the forces?
Answer: 24.39 N
Explanation:
Given
Torque required to open the lid is [tex]\tau =2\ N.m[/tex]
diameter of lid [tex]d=8.2\ cm[/tex]
Force exerted by fingers and thumb forms a couple. So, torque can be written as
[tex]\Rightarrow \tau= F\times 2r\\\Rightarrow 2=F\times 8.2\times 10^{-2}\\\\\Rightarrow F=\dfrac{200}{8.2}\\\\\Rightarrow F=24.39\ N[/tex]
Thus, the magnitue of each force is 24.39 N
the electromagnet shown in the image has a wire coiled 5 times around a nai. it can lift up to 7 metal paper clips. What two changes would cause the electromagnet to increase its electromagnetic force and lift more paper clips?
Answer:
Explanation:
The electromagnetic force of an electromagnet can be increased by:
1. wrapping the wire around the coil more times; or
2. increasing the current passing through the coil.
The two changes would cause the electromagnet to increase its electromagnetic force and lift more paper clips:
increase the number of turns of wire on the core.increase the amount of current flowing through the wire.What is electromagnet?A coil of wire is used to create electromagnets (wire curled in series). This generates a magnetic field more effectively than a wire running straight. By tightly winding a wire around a strong magnetic core formed of an iron-based substance, this effect can be amplified.
An electromagnet is created by winding an insulated copper wire either in the shape of a solenoid or a U around a soft iron core and running current through it.
The quantity of wire turns twisted around the coil determines an electromagnet's magnetic field's strength. how much current is passing via the cable.
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Compared to the image which drawing is the closest
Answer:
The one on the left
Explanation:
Answer:
The one on the left
Explanation:
[tex]what \: is \: water \: cycle \: \: {?} [/tex]
Answer:
water cycle show the continuous movement of water with in the earth and atmosphere
Explanation:
Hope this helps :)
The water cycle is the process through which water evaporates from the earth's surface, rises into the atmosphere, cools and condenses into rain or snow in clouds, and then falls back to the surface as precipitation. Water that falls on land gathers in rivers and lakes, soil, and porous rock strata, and much of it goes back into the seas to evaporate. Water flows in and out of the system.
✄-----------------------------------hope it helps...have a great day!!What is an impulse? (select all that apply)
J=Ft
change in momentum
V=m/a
a rash decision
Answer:
change in momentum
Explanation:
using newton's second law,
F = m ( v - u ) / t....
Ft = mv - mu
impulse is either Ft ( product of force applied and the time taken for its action )
or impulse is mv - mu ( change in momentum )
A rock is thrown horizontally from a height of 6.00 m. Which of the following is the time required for the rock to reach the ground ?
Answer:
t=10.95 seg
Explanation:
The vertical component of velocity is 0, so, the time in air can be calculated
[tex]h=v_ot-\frac{1}{2}gt^2\\\\h=0-\frac{1}{2}gt^2~=>t=\sqrt{2gh}=\sqrt{2*10\frac{m}{s^2}*6m}=10.9544~seg[/tex]
Rooms are fitted with ventilators to let the air move around. The phenomenon involved is:
a. conduction
b. Convection
c. radiation
d. condensation
Answer:
B. Convection
Explanation:
Convection is the process in which heat is transferred from one point to another by the actual movement of the material particles from a region of high temperature to a region of low temperature.
how do various factors affect climent
Answer:
The factors affecting climate are latitude, altitude, land and water distribution, distance from the sea, distance from the sun, prevailing winds and ocean currents, surface covering the land, volcanism, solar constant sunspots, wind direction and nature of mountain chains, mountain barriers.
There are six major climatic controls. They are:
Latitude: As the earth is round, sunlight does not reach everywhere equally. The temperature decreases as we move from the equator to the poles.
Altitude: As we move from the surface of the earth to the higher altitudes, the temperature decreases.
Pressure and wind system: The pressure and wind system of any area depend on the latitude and altitude of that place. Thus, it influences the temperature accordingly.
Distance from the sea: Coastal regions are cooler as compared to interior regions. As the distance from the sea increases, its influence decreases and the people experience extreme weather conditions.
Ocean currents: Cold ocean currents flowing over a region will decrease the temperature of that area whereas warm currents will increase the temperature.
Relief features: Relief features are the barriers that block currents from entering the country. High mountains act as barriers for cold or hot winds.
A scientist recorded the number of geese found in a park on various days of the week. The data are shown below. 22, 25, 29, 21, 33, 28, 28 What is the range of these data? O A. 33 O B. 7 O C. 21 O D. 12
Answer: it's 12
Explanation:
Range is the difference between the highest and lowest numbers.
33-21=12
Which resource would be the best choice to learn more information about studying martial arts?
I think videos help more than books when it comes to martial arts. You can get it on YouTu.be if your teacher doesn't teach you online, in this pandemic.
Answer:
The answer is A.) Dance studio.
Explanation:
See screenshot below
Hope this helps! :D
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Assuming constant volume, the pressure of a sealed system is 25.0 kPa at 25.0°C. If the temperature of the system increases by 15.0 °C, what is the new pressure of the sealed system?
Answer:
use the gas law equations
[A] Write an expression for the equivalent resistance of three resistors connected in parallel.[ no derivation needed]
[B] In the circuit diagram given along-side, find:
[i] Total resistance of the circuit.
[ii] Total current flowing in the circuit.
[iii] The potential difference across R1
Answer:
1) R1 + ((R2 × R3)/(R2 + R3))
2) 0.5 A
3) 3.6 V
Explanation:
1) We can see that resistors R2 and R3 are in parallel.
Formula for sum of parallel resistors; 1/Rt = 1/R2 + 1/R3
Making Rt the subject gives;
Rt = (R2 × R3)/(R2 + R3)
Now, Resistor R1 is in series with this sum of R2 and R3. Thus;
Total resistance of circuit = R1 + ((R2 × R3)/(R2 + R3))
2) R_total = R1 + ((R2 × R3)/(R2 + R3))
We are given;
R1 = 7.2 Ω
R2 = 8 Ω
R3 = 12 Ω
R_total = 7.2 + ((8 × 12)/(8 + 12))
R_total = 7.2 + 4.8
R_total = 12 Ω
Formula for current is;
I = V/R
I = 6/12
I = 0.5 A
3) since current through the circuit is 0.5 and R1 is 7.2 Ω.
Thus, potential difference through R1 is;
V = IR = 0.5 × 7.2 = 3.6 V
NEED HELP
A 0.558 kg block of copper at 117°C comes in contact with a 1.11 kg block of aluminum at 15.8°C. What is their equilibrium temperature?
there it is fella tried on ma own consciousness
Answer:
33.8
Explanation:
(Acellus)
An astronaut is said to be weightless when he/she travels in a satellite. Does it mean that the earth does not attract him/her
First of all, what a weight is? weight is m × g.. and when a person is in space then the force of gravity isn't acting on him or her, so yeah it will not have weight, but remember gravity is a very very low, now if a body has more mass, more gravity will act on it right? just imagine the mass of a person and that of earth.. now yes, earth will do exert a force on the astronaut but is negiligable.
Two children are pulling and pushing a 30.0 kg sled. The child pulling the sled is exerting a force of 12.0 N at a 45o angle. The child pushing the sled is exerting a horizontal a force of 8.00 N. There is a force of friction of 5.00 N.
Answer:
okay sooo the weight is: 294 n
the normal force is 286 n
the acceleration is: -0.38 m/s²
Answer:
294 n
286 n
-0.38 m/s²
Explanation:
A wave has a frequency of 34 Hz and a wavelength of 2.0 m. What is the
speed of the wave? Use V= fx.
A. 17 m/s
B. 68 m/s
C. 0.059 m/s
D. 36 m/s
Answer:
v=FX
v=34(2.0)
v=68m/s
Which object would most like absorb sound?
Answer:
a blanket
Explanation:
soft materials absorb sounds meanwhile hard materials just reflect them causing an echo
kinds of solar power stations
How do you determine the specific heat of a substance?
A. Divide the enthalpy change by the change in temperature.
B.Divide the enthalpy change by the product of the mass and change in temperature.
C.Divide the change in temperature by the product of the mass and enthalpy change.
D.Divide the change in temperature by the change in enthalpy.
Answer:
I think it's A
Explanation:
What is the total resistance of a 6 ohm and a 8 ohm resistor connected in series?
(1 Point)
Answer:
Total Resistance in circuit is Fourteen Ohms (14 Ω).
Explanation:
How do we know, if the resistors are connected in series, the total resistance is the sum of all the resistors.
(Important: The total resistance can only be added just when the resistors are connected in series)
Then, total resistance (TR ) is the sum of all resistors (T1 + T2, in this case)
TR = T1 + T2
According to problem data, we have:
TR = 8 Ω + 6 Ω
TR = 14 Ω
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Which properties do all metals on the periodic table share?
A. They have the same melting point
B. They are gases at room temperature
C. They react strongly with other elements
D. They conduct thermal and electrical energy.
E. They have a high amount of valence electrons.
Answer: D. They conduct thermal and electrical energy.
Explanation:
I need help QUICK!! 20 points
Which of the following is/are formed as gravity pulls increasing amounts of dust and debris in a nebula together?
a. the solar wind
b. meteors
c. planetesimals
d. meteorites
describe one example of light being refracted in the living room
Answer:
television
Explanation:
a television refracts light (the light bounces off of the screen
Answer:
Suppose you have a glass slab as a paper weight, if you keep it on the paper, dont you see something strange? The paper becomes elevated in the glase slab. Everyone sees a waterbottle or glass everyday, while seeing through it, does everything seem normal? Nope. That's refraction.
Explanation:
You must have seen a prism, right? It makes light split into the visible electromagnetic spectrum.
A rock dropped in a graduated cylinder raises the level of water from 20 to 35 mL. The Rock has a mass of 45 g. What is the density of the rock?
Answer:
3 is the correct answer might be helpful
Answer in the proper number of significant numbers
23.4 x 14
Answer:
327.6 is the answer but there is 2 sig figs in 14 so change it to 330
so 330 is the final answer
hope this helps
have a good day :)
Explanation:
The multiplication product of 23.4 × 14 is 327.6. However, there is only two significant figures in 14. So we have to take the answer in 2 significant figure. Hence, the product can be written as 3.3 × 10².
What are significant figures ?Significant figures are number of digits which can be counted as certain values associated with some uncertainties as well. There are certain rules regrading the count of significant figures in a number.
The zeros after a non-decimal number cannot be taken as significant. For eg, in 4500, there are only two significant figures. The common rule for all the arithmetic operation is that, the significant figures in the product have to be equal to the number of significant figure in the number in the operation with least significant figures.
Here, the one with least significant figures is 14. It have two significant figures. Now, product of the two numbers is :
23.4 × 14 = 327.6
But the rounded product for correct significant figure is 3.3 × 10².
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If a dielectric is inserted bw the plates of a 20 microfarad capacitor, it's capacitance will be
A. Remain same
B. Be doubled
C. Be halved
D. Become zero
(Ans with explanation please)
Answer:
will be doubled
Explanation:
This is because when a dielectric material is inserted between the plates of capacitors the capacitance increases to
c = ke Co .
where ke is called the dielectric constant and Co is the capacitance without a dielectric material
When spray is applied to a car, the paint has a negative charge and the surface of the car has a positive charge. Some processes use a negatively charged paint and a grounded object. Explain why this also works.
Answer:
Based on the properties electrically charged particles, we have that unlike charges attract and like charges repel each other. In order for proper application of an electrostatically negatively charged paint to be properly applied on the metal body surface of a vehicle, require that for attraction, the surface of the vehicle should be grounded and positively charged so as to effectively attract the negatively charged paint particles as it exits the nozzle, to form a strong attachment with the positively charged surface of the vehicle
Explanation:
hi im being timed please help im trying to raise my F in the class before graduation
Answer:
D
Explanation:
If the incident beam of light in the figure below makes an angle (20 degrees) from the normal. What is the angle between the reflected ray and the mirror in the figure below?
Answer:
the reflected angle must be 20º
Explanation:
The surface on which the ray of light falls is a mirror, therefore the law of reflection must be fulfilled, which establishes that the incident angle is equal to the reflected angle.
Therefore, if the incident angle is 20º, the reflected angle must be 20º receiving the normal.
What occurs when light bends while passing from one medium to another?
Answer:So the answer is B
Explanation: When the light rays either bend or change their direction while passing from one medium to another it is called refraction of light. The refraction of light takes place when light travels from air into glass, from glass into air, from air into water or from water into air.
