v = ir
where v is voltage and i is current
r = v/i
r = 4/0.5
r = 8 ohms
The current through a wire is 0.5 a when the potential difference across is 4.0.v, the resistance of the wire is 8.0 ohms.
Ohm's law, which states that the resistance (R) of a wire is equal to the ratio of the potential difference (V) across the wire to the current (I) flowing through it, can be used to calculate the resistance of a wire.
It has the following mathematical expression:
R = V ÷ I
Here, it is given that:
Potential difference (V) = 4.0 V
Current (I) = 0.5 A
Now we can substitute the values into the formula:
R = 4.0 V ÷ 0.5 A
Calculating the division:
R = 8.0 ohms
Therefore, the resistance of the wire is 8.0 ohms.
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What is is
optical instrument
Answer:
A simple microscope is an optical instrument we use for the magnification of small object to get a clear image or vision.It is a convex lens having a short focal length.
Answer:
Optical instruments is an instrument which is used in lens to make the image of an image
This is a short answer question, please answer in full sentences.
Apply Newton’s third law of motion to the action of serving a volleyball.
Answer:
when we hit the volleyball. the ball goes up comes down
it comes down as it is forced by gravity
the force in which ball comes back is Newton 3 law
When conducting a polygraph test why is it important for the interviewer to establish a baseline on the interviewee?
Answer:
Because always when we do an experiment, we need something to compare.
For example, if we want to see how much change a given color paint when we add different amounts of white paint to it, we need to have at least one sample of pure color paint, so we can compare it whit the ones with mixed paints.
Well, the case of the polygraph is exactly the same, we need to have a baseline, so we the interviewer can see if for some questions there is a change in the line compared with the baseline.
Scientists might make a computer model of volcanic eruptions. What is the biggest benefit of this model
Answer:
I think it would be to be able to prevent a volcanic eruption in the future and take the appropriate prevention protocols.
Explanation:
A train traveled at an average speed of 80 mph for 4.2 hours. Then, it traveled at an average speed of 60 mph for 1.5 hours. What was the total distance covered by the train?
Answer:
The answer is four hundred twenty six or 426
Answer:
426
Explanation:
Question 10 of 10
Two particles are separated by 0.38 m and have charges of 1.25 x 10-9C and
1.92 * 10-°C. Use Coulomb's law to predict the force between the particles if
the distance is doubled. The equation for Coulomb's law is F = kouse, and
the constant, k equals 9.00 x 109 Nm²/C2
A. -1,50x10-7N
B. -3.74 x 10-8N
C. 1,50 x 10-7N
D. 3.74 x 10-8N
SUBMIT
Answer:
Its d 3.74 x 10-8N
Explanation:
Answer: 3.74 x 10-8 N
Explanation:
PLEASE HELP, TELL ME THE PROPERTIES OF THESE THREE STATES OF MATTER WILL GIVE BRAINLIEST
I) Name of State of Matter: Solid
a) Property of this State of Matter:
b) Property of this State of Matter:
c) Property of this State of Matter:
II) Name of State of Matter: Liquid
a) Property of this State of Matter:
b) Property of this State of Matter:
c) Property of this State of Matter:
III) Name of State of Matter: Gas
a) Property of this State of Matter:
b) Property of this State of Matter:
c) Property of this State of Matter:
Answer:
I) Name of State of Matter: Solid
a) Property of this State of Matter: Definite shape and volume.
b) Property of this State of Matter: Generally have a higher density.
c) Property of this State of Matter: Diffusion of one solid into another solid is characteristically slow.
II) Name of State of Matter: Liquid
a) Property of this State of Matter: Definite volume but no definite shape.
b) Property of this State of Matter: Vaguely compressible; Barely compressible.
c) Property of this State of Matter: Flow from a higher level to a lower level.
III) Name of State of Matter: Gas
a) Property of this State of Matter: Easily compressible.
b) Property of this State of Matter: Expand to fill containers.
c) Property of this State of Matter: They are able to occupy far more space than liquids or solids.
Answer:
The theree state of matter is
1.solid.
2.liquid.
3.gas.
Explanation:
What is the speed of a 55.0 kg skydiver who has 7.81 x 104 J of kinetic energy?
Answer:
v=53.3m/s
Explanation:
Ek=1/2mv²
7.81×10⁴=1/2×55.0v²
v= the square root of 7.81×10⁴/0.5×55.0
v=53.3m/s
The speed of a 55.0 kg skydiver who has 7.81 x 104 J of kinetic energy is 53.29 m/s.
To find the speed, the given values are,
Mass m = 55 Kg
Kinetic Energy = 7.81x 10⁴ J
What is Speed?Speed is the rate of change of distance with time. It is a scalar quantity with magnitude both no direction.
Speed = Distance / Time m/s.
The unit is m/s or km/hr or mile/hr.
Distance covered is simply the length of the path traveled. The unit is m or km or miles.Time taken is the duration of an event. The unit is seconds or minutes or hour.Formula,
Kinetic energy = Ke = 1/2 mv²
When we solve for v,
v² = 2Ke/m
Substituting the given values,
v² = 2(7.81 x 10⁴) / 55
Simplifying,
v² = 15.62 x 10⁴ / 55
v² = 0.284 x 10⁴
v = 0.53291 x 10⁴
v = 53.29 m/s.
The speed of a 55.0 kg skydiver who has 7.81 x 104 J of kinetic energy is 53.29 m/s.
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in determining the percentage purity of an impure NaCo3 for 4.2g of the impure was place in measuring cylinder to work up to 1000cm . the resultant solution is neutralize by 0.092m of 20.40cm3 Hcl in lab [ na=23,o= 16, c=12, h=1, cl=35-5]
hint: percentage purity =mass pure substance ×100
mass concentrate : impure substance??
[tex] {?}^{2} [/tex]
[tex] \binom{}{3} [/tex]
Answer:
C
Explanation:
I guess...
Sorry if it's wrong
whats the force of a pitching machine on a baseball
Answer:
kinetic
Explanation:
Answer:
Baseballs pitched by a machine have a horizontal velocity of 30 meters/second. The machine accelerates the baseball from 0 meters/second to 30 meters/second in 0.5 seconds. If a baseball has a mass of 0.15 kilograms, the force the machine exerts its newtons.
V=A shot-putter tosses an 8 kg metal ball across a field. The ball moves from rest to a velocity of 4 m/s in 0.8 seconds. Calculate the force (in Newtons) that was used to move the ball. Don't input the unit.
Physics is confusing :(
Answer:
30's-40's
Explanation:
In addition to displacement, which of the following must be used for a more complete description of the average velocity of an object?
acceleration
O change in time
O Distance
O speed
Answer:
Option: 3 Speed √
is the right answer
What is meant by the term "fixed point"?
Explanation:
A fixed point is a point x such that. f(x) = x . Graphically, these are exactly those points where the graph of f, whose equation.
Answer:
a fix joint is a point x such that.f (x) = x.
Explanation:
Graphically, these are execty those point where the graph of f, whose equation.
a kid throws a ball from a tower 45 meters tall how fast is the ball going when it hits the ground?
Answer:
29.69 m/s
Explanation:
From the question given above, the following data were obtained:
Height (h) = 45 m
Velocity (v) =...?
Next, we shall determine the time taken for the ball to get to the ground. This can be obtained as follow:
Height (h) = 45 m
Acceleration due to gravity (g) = 9.8 m/s²
Time (t) =?
h = ½gt²
45 = ½ × 9.8 × t²
45 = 4.9 × t²
Divide both side by 4.9
t² = 45/4.9
Take the square root of both side
t = √(45/4.9)
t = 3.03 s
Finally, we shall determine the velocity with which the ball hits the ground. This is illustrated below:
Initial velocity (u) = 0 m/s
Acceleration due to gravity (g) = 9.8 m/s²
Time (t) = 3.03 s
Final velocity (v) =.?
v = u + gt
v = 0 + (9.8 × 3.03)
v = 0 + 29.694
v = 29.694 ≈ 29.69 m/s
Therefore, the ball hits the ground with a velocity of 29.69 m/s.
Does a parachute a free fall give reason
Answer:
no
Explanation:
because there is nothing holding you back
8. You are heating a substance in a test tube. Always point the open end of the ne
a. Toward yourself
b. Toward your lab partner
C. Toward another classmate
d. Away from all people
Answer:
b ok bye thansks
bye.
Always point the open end of a test tube being heated d. Away from all people.
When heating a substance in a lab, there is a chance that the substance could react to the heat and evaporate into a gaseous state.
This could be very dangerous if the gas is:
corrosivea pollutant biological breathing hazardYou should therefore be careful to point the tube away from others and yourself so that the gas does not affect either them or you.
In conclusion therefore, always point the open end of the tube away from all people.
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A sound wave ________ and ______ the air molecules around your ear.
A sound wave squeezes together and thins out the air molecules around your ear. The places where these things happen are called the compressions and rarefactions of the sound wave.
A truck is moving at a constant speed of 50 m/s. A boy riding in the back of the truck throws a newspaper out the back of the truck at a speed of 20 m/s. What is the speed of the paper relative to someone standing on the roadside?
Answer:
70m/s
Explanation:
The potential energy for a mass on a spring is proportional to the square of which of these quantities?
OA.mass
OB.frequency
OC.period
OD.displacement
O E. velocity
When does The mass of an object change
O A. it changes shape
O B. it loses a piece hs
O C. it gets hotter
O D. it gets cooler
Answer:
B. when it loses a piece
Explanation: it likely gets lighter
HELP PLEASE!!!! 20 POINTS! If we increase the distance traveled over the same period of time, this will (2 points) decrease the speed
increase the speed
decrease the velocity
not affect speed or velocity
A roundabout in a fairground requires an input power of 2.5 kW when operating at a constant angular velocity of 0.47 rad s–1 . (a) Show that the frictional torque in the system is about 5 kN m. (3) 1. (b) When the power is switched off, the roundabout decelerates uniformly because the
Answer:
Explanation:
Since the roundabout is rotating with uniform velocity ,
input power = frictional power
frictional power = 2.5 kW
frictional torque x angular velocity = 2.5 kW
frictional torque x .47 = 2.5 kW
frictional torque = 2.5 / .47 kN .m
= 5.32 kN . m
= 5 kN.m
b )
When power is switched off , it will decelerate because of frictional torque .
What is the smallest unit that makes up matter?
alloys
atoms
chemicals
molecules
Answer:
atoms
Explanation:
.....(✿^‿^).......
Answer:
atom
Explanation:
An atom is the smallest unit of matter that retains all of the chemical properties of an element
4. Why does time play an important role in collisions?
a) Time plays no important role in collisions
b) The longer the time of the collision, the smaller the force
c) The longer the time of the collision, the larger the force
d) The shorter the time of the collision, the smaller the force
The longer the time of the collision, the smaller the force. (B)
That's why, if you fall off the roof, you want to be stopped by a net or a pile of leaves, and not by the ground. You want the stop to last as long as possible. Like everybody says: It's not the fall that hurts, it's the stop at the end.
Without completing the calculations, determine what the new volume will be in the problem below. Also, explain how you were able to determine the new volume without completing the calculations. Pay special attention to how the pressure is changing. An 80.0-mL sample of carbon monoxide gas (CO) is stored at a pressure of x kPa. The pressure is doubled to 2x kPa. What is the new volume?
According to the Boyle's law, as pressure is inversely proportional to volume at constant temperature the the new volume of gas is 40 ml.
What is Boyle's law?Boyle's law is an experimental gas law which describes how the pressure of the gas decreases as the volume increases. It's statement can be stated as, the absolute pressure which is exerted by a given mass of an ideal gas is inversely proportional to its volume provided temperature and amount of gas remains unchanged.
Mathematically, it can be stated as,
P∝1/V or PV=K. The equation states that the product of of pressure and volume is constant for a given mass of gas and the equation holds true as long as temperature is maintained constant.The nature of graph obtained when gas obeys Boyle's law is hyperbolic curve.
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Which event in the “The Medicine Bag” is most symbolic of Martin beginning to connect with his Sioux heritage?
Martin brings his friends home to meet Grandpa.
Martin chases the dogs away from Grandpa.
Martin finds a leather pouch around Grandpa’s neck.
Martin finds money in Grandpa’s boots.
Answer:
A- Martin brings his friends home to meet grandpa.
Explanation:
took the test.
Answer:
A
Explanation:
on edge :)
Jonathan connected a bulb of unknown resistance to a 3.7 V battery and measured a current of 1.23 A flowing through the bulb.
What current flowing through the bulb can Jonathan claim for his second electric circuit?
A
0.60 amps
B
1.66 amps
C
15.00 amps
D
15.15 amps
Answer:
d
Explanation:
15.15 amps lowing through the bulb can Jonathan claim for his second electric circuit
What is a circuit ?Electronic components like resistors, circuitry, capacitors, inductors, and diodes are connected by conductive cables or traces that allow electric current to flow between them.
It is a specific kind of electrical circuit, and it is called as electronic rather than electrical, there usually needs to be at least each active component present.
In this circuit Signals can be amplified, calculations can be made, and data can be transported from one location to another thanks to the combination of factors and wires.
Electric current is generated by a power source like battery, and can travel through conductors such as wires, before returning to the power source. Electric circuits can be divided into two types: series and parallel circuits.
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accelerates uniformly from rest, reaching a speed of 36 meters per second in 6.0 seconds
Answer:
What's the question?
Explanation:
Two waves have the following waveforms.
Wave A
U
Wave B
Which conclusion can BEST be supported by the illustrations?
lol i’m in your physical science class what was the answer
