With the water trap being used, all the possible sources of error would be eliminated.
True
False
Answer:
True
Explanation:
One object has a negative charge. The other object has a positive charge.
The objects will _____.
neither repel nor attract each other
repel each other
both repel and attract each other
attract each other
Answer:
attract each other
Explanation:
attract each other, opposite charges attract each other, similar charges repel.
What is the average power output pf a weight lifter who can lift 250 kg 2.0 m in 2.0 s
Answer:
Power = 2.45Kw or 2450 Watts.
Explanation:
Given the following data;
Mass, m = 250kg
Height, h = 2m
Time, t = 2secs
We know that acceleration due to gravity, g is equal to 9.8m/s²
Power can be defined as the energy required to do work per unit time.
Mathematically, it is given by the formula;
[tex] Power = \frac {Energy}{time} [/tex]
But Energy = mgh
Substituting into the equation, we have
[tex] Power = \frac {mgh}{time} [/tex]
[tex] Power = \frac {250*9.8*2}{2} [/tex]
[tex] Power = \frac {4900}{2} [/tex]
Power = 2450 Watts
To convert to kilowatt (Kw), we would divide by 1000
Power = 2450/1000
Power = 2.45Kw.
Therefore, the average power output of the weightlifter is 2.45 Kilowatts.
The average power output of the weight lifter who can lift the given mass is 2450 Watts.
Given the data in the question;
Mass; [tex]m = 250kg[/tex]Displacement; [tex]d = 2.0m[/tex]Time taken; [tex]t = 2.0s[/tex]Power is the amount of energy transferred per unit time. It is expressed as:
[tex]P = \frac{W}{\delta t}[/tex]
Where W is work done and t is elapsed time.
So, we find the work done
Work done = Force × Displacement
Since Force = Weight = m × g
Where g is acceleration due to gravity ( [tex]9.8m/s^2[/tex] )
Hence
[tex]Work\ done = mg * d\\\\Work\ done = 250kg\ *\ 9.8m/s^2\ *\ 2.0m\\\\Work\ done = 4900kg.m^2/s^2[/tex]
We substitute our value into the previous equation
[tex]P = \frac{Work\ done}{\delta t}\\\\P = \frac{4900kg.m^2/s^2}{2.0s} \\\\P = 2450kg.m^2/s^3\\\\P = 2450J/s\\\\P = 2450W[/tex]
Therefore, the average power output of the weight lifter who can lift the given mass is 2450 Watts.
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Explain the Conversation of Mass.
Answer:
The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as the system's mass cannot change, so quantity can neither be added nor be removed
Explanation:
Hope this helps!! Please consider marking brainliest! Have a good one!!
The average speed of an object which moves 100 m in 5 seconds is?
Answer:
A car
Explanation:
A car can travel 100 m in 5 seconds
Hope this helps!
Mary Jo went on riding her horse through the trails. Her pace was 8 km/hr. She left at 8:30 am and got back to the barn at 9:00 am. How far did she go?
16 m/s
4 m/s
4 km
16 km
it is difficult to catch fast moving crickrt ball than fast moving tennis ball why?
Answer:
because of its mass. Momentum is directly propotional to the mass of a body
Answer:
Mass
Explanation:
A tennis ball has a mass of around 57 grams and a cricket ball has a mass of around 156 grams. It's much easier to catch a fast moving tennis ball because it is lighter than a cricket ball. Hope this helps x
which of the following is a chemical property of a mineral?
A Hardness
B Luster
C Atomic structure
D Color
Hardness, color , and luster.
But since you can pick one, I would say hardness
I need help on this question please answer within like a PLEASE QUICK HELP
Consider a train car being pulled along a track by the engine. What are four forces acting on the train car?
Answer:
kinetic & potential
Explanation: whats the other 2 tho?
What is the mass of a box with a weight of 200 N?
200 kg
20.4 kg
0.05 kg
2000 kg
Answer:
F =mg
200= m ×10
200/10 =m
20kg= m
The wavelengths for visible light rays correspond to which of these options?
A.
about the size of a pen
B.
about the size of a virus or a large molecule
C.
about the size of an amoeba
D.
smaller than an atom
E.
about the size of a football field
Answer:
sorry about the other person but its b
Explanation:
Answer:
this is the correct answer
Explanation:
An 85 kg man and his 35 kg daughter are sitting on opposite ends of a 3.00 m see-saw. The see-saw is anchored in the center. If the daughter sits 0.20 m
from the left end, how far from the right end would the father have to sit for the see-saw to be in balance? (g = 10)
type your answer...
Answer:
0.54m
Explanation:
Step one:
given data
length of seesaw= 3m
mass of man m1= 85kg
weight = mg
W1= 85*10= 850N
mass of daughter m2= 35kg
W2= 35*10= 350N
distance from the center= (1.5-0.2)= 1.3m
Step two:
we know that the sum of clockwise moment equals the anticlockwise moment
let the distance the must sit to balance the system be x
taking moment about the center of the system
350*1.3=850*x
455=850x
divide both sides by 850
x=455/850
x=0.54
Hence the man must sit 0.54m from the right to balance the system
Please help me........
Answer:
.
Explanation:
Answer:
the pelvice
Explanation:
How much energy must be absorbed by water with a mass of 0.5 kg in order to raise the temperature from 30°C to 65°C? Note: Water has a specific heat of 4,190 J/kg °C
Answer:
Q = 73325 J or 73.325 KJ
Explanation:
According to specific heat capacity, 73,325 J of energy must be absorbed by water with a mass of 0.5 kg in order to raise the temperature from 30°C to 65°C.
What is specific heat capacity?Specific heat capacity is defined as the amount of energy required to raise the temperature of one gram of substance by one degree Celsius. It has units of calories or joules per gram per degree Celsius.
It varies with temperature and is different for each state of matter. Water in the liquid form has the highest specific heat capacity among all common substances .Specific heat capacity of a substance is infinite as it undergoes phase transition ,it is highest for gases and can rise if the gas is allowed to expand.
It is given by the formula ,
Q=mcΔT
In the given example, substitution in above formula gives,Q=0.5×4190×35=73,325 J.
Thus, 73,325 joules of energy must be absorbed by water with a mass of 0.5 kg .
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Which of the following is a growing threat to animals that are believed to be critical to the success of natural remedies?
competition for resources
disease and illness
poaching by hunters
increase in predators
Answer:
I would think the first and the third answer
Answer:
i would say 3rd cause other may slightly effect
Where does the negative charge come from?
negative charge come from the gain of electron
Answer:
An electrical charge is created when electrons are transferred too or removed from an object. Because electrons have a negative charge, when they are added to an object, it becomes negatively charged. When electrons are removed from an object, it becomes positively charged.
From G00gle
Explanation:
Water at 15°C (rho = 999.1 kg/m³ and μ = 1.138 × 10⁻³ kg/m·s) is flowing steadily in a 29-m-long and 6-cm-diameter horizontal pipe made of stainless steel at a rate of 10 L/s. Determine the pressure drop, the head loss, and the pumping power requirement to overcome this pressure drop. The roughness of stainless steel is 0.002 mm.
Answer:
Explanation:
From the given information:
We can estimate the cross-sectional area of the pipe by using the formula:
[tex]A_c = \dfrac{\pi}{4} D^2[/tex]
[tex]A_c = \dfrac{\pi}{4} (6 \times 10^{-2} \ m)^2[/tex]
[tex]A_c = 0.0028274 \ m^2[/tex]
To find the average velocity of the water flowing through the pipe by using the formula;
[tex]V = \dfrac{\mathtt{V}}{A_c}[/tex]
[tex]V = \dfrac{10 \times 10^{-3} \ m^3/s}{0.0028274}[/tex]
[tex]V = 3.537 \ m/s[/tex]
However, the Reynolds number can be determined by using the equation
[tex]Re= \dfrac{\rho \times V \times D}{\mu}[/tex]
[tex]Re= \dfrac{(999.1 \ kg/m^3) \times (3.537 \ m/s) \times (6 \times 10^{-3} \ m)}{1.138 \times 10^{-3} \ kg/m.s}[/tex]
Re = 18631.7225
From above, Re> 4000, thus, the flow will be turbulent.
By using Colebrook's equation in a turbulent flow; we have the following expression for Colebrook's equation:
[tex]\dfrac{1}{\sqrt{f}}= -2.0 \ log \bigg ( \dfrac{\epsilon/D_h}{3.7}+ \dfrac{2.51}{Re \sqrt{f}} \bigg )[/tex]
where;
[tex]f[/tex] = frictional force = ???
[tex]\epsilon[/tex] = roughness of steel= 0.002 mm
Replacing our values into the above equation, we have:
[tex]\dfrac{1}{\sqrt{f}}= -2.0 \ log \bigg ( \dfrac{ 2\times 10^{-6 \ m }/6 \times 10^{2 }\ m}{3.7}+ \dfrac{2.51}{18631.7225 \sqrt{f}} \bigg )[/tex]
By solving the above equation for f; we get
f = 0.026409
The pressure drop in flow;
[tex]\Delta P_L = f \dfrac{L}{D} \dfrac{\rho V^2}{2}[/tex]
[tex]=0.026409(\dfrac{29}{0.06})(\dfrac{999.1*3.537^2}{2})[/tex]
= 79771.50524 Pa
= 79.772 kPa
The pressure drop = 79.772 kPa
The head loss in the pipe:
[tex]h_L = \dfrac{\Delta P_L}{\rho g}[/tex]
= [tex]\dfrac{79771.50524 }{999.1 * 9.81}[/tex]
= 8.14 m
The power input
[tex]W_{pump} = V\Delta P_L[/tex]
= 10 * 10^{-3} * 79771.50524
= 797.72 W
A sales clerk at a local hardware store sells you a hammer with a mechanical advantage of 10 when used to pry up nails. You are able to create a force of 60 N. Using the hammer, what would be the maximum force that could be generated to remove a nail?
Answer:
W = 600 N
Explanation:
The mechanical advantage of any machine is the ratio of the load or weight to the effort applied. Hence, the general formula for mechanical advantage is as follows:
M.A = W/P
where,
M.A =Mechanical Advantage of Hammer = 10
W = Maximum force that could be generated = ?
P = Force created by me = 60 N
Therefore,
10 = W/60 N
W = 10*60 N
W = 600 N
How much time does it take a trucker to deliver his shipment 480 km away travelling at an average speed of 120 km/hr?
Answer: time=4 hours
Explanation:
formula:
speed = [tex]\frac{distance}{time}[/tex]
time = [tex]\frac{distance}{speed}[/tex]
time= x
speed = 120km/hr
distance = 480 km
x = [tex]\frac{480 km}{120km/hr\\}[/tex]
=[tex]\frac{48km*hr}{12km}[/tex]
cut the zeros
and remove the signs
then
[tex]\frac{48}{12}[/tex] = 4
therefore, time taken to deliver the shipment by trucker is 4 hours
As temperature ____, molecular movement ____ , causing the distance between atoms to ____
a. deceases, increases, increase
b. Increases, increases, increase
c. decreases, increases, decrease
d. Increases, decreases, increase
Answer:
The correct answer is b.
Which statement accurately describes current electricity?
A. Positively charged particles build up on an object's surface. B. Negatively charged particles build up on an object's surface. C. Positively charged particles move from one point to another. D. Negatively charged particles move from one point to another.
Answer: negatively charged particles move from one point to another
Explanation:
In electricity, negatively charged particles move from one point to another. The correct option is D.
What is electricity?Electric current is what causes electricity to exist and move. We can transmit energy using electricity so that we can carry out easy tasks.
The movement of electrons through conductors like copper wires is its most well-known manifestation. Electrical energy is commonly referred to as "electricity."
The flow of electrical power, commonly referred to as a charge, is the source of the energy type known as electricity.
Our homes, lights, and electrical devices are all powered by electricity. Resources including coal, energy, natural gas, and oil are used to generate power.
Particles that are negatively charged in electricity travel from one location to another.
Thus, the correct option is D.
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A child is sitting on a merry-go-round 2.8 m from the
center. If the tangential velocity of the ride is 0.89 m/s,
what is the centripetal acceleration of the dragonfly?
A. 0.11 m/s2
C. 0.32 m/s2
B. 0.28 m/s2
D. 2.2 m/s2
Answer:
b
Explanation:
a=v2/r
=0.89^2/2.8
=0.2828...
=0.28
The centripetal acceleration of the child sitting on a merry-go-round 2.8 m from the center will be 0.283 m/s².
What is centripetal acceleration?
Centripetal acceleration is the constant change in velocity necessary for an object to maintain a circular path. We can write the formula for centripetal acceleration as -
a[C] = v[T]²/r
where -
v[T] is tangential velocity
r is radius
Given is a child is sitting on a merry-go-round 2.8 m from the center and the tangential velocity of the ride is 0.89 m/s.
We can write -
Radius [r] = 2.8 m
Tangential velocity = v[T] = 0.89 m/s.
Using the formula for centripetal acceleration -
a[C] = v[T]²/r
a[C] = (0.89 x 0.89)/2.8
a[C] = 0.283 m/s²
Therefore, the centripetal acceleration of the child sitting on a merry-go-round 2.8 m from the center will be 0.283 m/s².
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Determine the components of reaction at the fixed support
a. the 400 n, 500 n, and 600 n forces are parallel to the x, y, and z axes, respectively
Complete Question
The complete question is shown on the first uploaded image
Answer:
The components of reaction at the fixed support are
[tex]A_{(x)} = 400 \ N[/tex] , [tex]A_{(y)} = -500 \ N[/tex] , [tex]A_{(z)} = 600 \ N[/tex] , [tex]M_x = 1225 \ N\cdot m[/tex] , [tex]M_y = 750 \ N\cdot m[/tex] , [tex]M_z = 0 \ N\cdot m[/tex]
Explanation:
Looking at the diagram uploaded we see that there are two forces acting along the x-axis on the fixed support
These force are 400 N and [tex]A_{(x)}[/tex] [ i.e the reactive force of 400 N ]
Hence the sum of forces along the x axis is mathematically represented as
[tex]A_{(x)} - 400 = 0[/tex]
=> [tex]A_{(x)} = 400 \ N[/tex]
Looking at the diagram uploaded we see that there are two forces acting along the y-axis on the fixed support
These force are 500 N and [tex]A_{(y)}[/tex] [ i.e the force acting along the same direction with 500 N ]
Hence the sum of forces along the x axis is mathematically represented as
[tex]A_{(y)} + 500 = 0[/tex]
=> [tex]A_{(y)} = -500 \ N[/tex]
Looking at the diagram uploaded we see that there are two forces acting along the z-axis on the fixed support
These force are 600 N and [tex]A_{(z)}[/tex] [ i.e the reactive force of 600 N ]
Hence the sum of forces along the x axis is mathematically represented as
[tex]A_{(z)} - 600 = 0[/tex]
=> [tex]A_{(z)} = 600 \ N[/tex]
Generally taking moment about A along the x-axis we have that
[tex]\sum M_x = M_x - 500 (0.75 + 0.5) + 600 ( 1 ) = 0[/tex]
=> [tex]M_x = 1225 \ N\cdot m[/tex]
Generally taking moment about A along the y-axis we have that
[tex]\sum M_y = M_y - 400 (0.75 ) + 600 ( 0.75 ) = 0[/tex]
=> [tex]M_y = 750 \ N\cdot m[/tex]
Generally taking moment about A along the z-axis we have that
[tex]\sum M_z = M_z = 0[/tex]
=> [tex]M_z = 0 \ N\cdot m[/tex]
NEED HELP ASAP
The distance from the midpoint to the height of a crest is known as the____
1) amplitude
2)crest
3)wavelength
4)frequency
Answer:
Wavelength!
Explanation:
At least I think? Or wavelength might be crest to crest! Sorry if I'm incorrect. Let me know how I did!
what is meant by the term moment in "physics".
a 45.0-N force pushes a cart 15.0 meters down a hallway. What is the work done on the cart?
Answer:
675 NExplanation:
The work done by an object can be found by using the formula
workdone = force × distance
From the question we have
workdone = 45 × 15
We have the final answer as
675 NHope this helps you
A child attempts to move a 90.01 kilogram refrigerator in order to retrieve a rubber
ball from behind it. If she is able to slide the refrigerator across the floor with 55
Newtons of force (ignoring friction), what would be its acceleration?
Answer:
[tex]a=0.611\ m/s^2[/tex]
Explanation:
Given that,
Mass of a refrigerator, m = 90.01 kg
She is able to slide the refrigerator across the floor with 55 N of force.
We need to find the acceleration of the refrigerator.
Let it is a. Using second law of motion:
F = ma
[tex]a=\dfrac{F}{m}\\\\a=\dfrac{55\ N}{90.01\ kg}\\\\a=0.611\ m/s^2[/tex]
So, its acceleration is [tex]0.611\ m/s^2[/tex].
. You are standing at the top of a high cliff. You drop a rock and it hits the ground 4
seconds later. How fast was it going when it hits the ground?
Answer:
V = -39.2m/s
Explanation:
Given the following data
Time, t = 4secs
Since the rock is falling, we know that the initial velocity = 0
Acceleration due to gravity = 9.8m/s²
To find the final velocity, we would use the first equation of motion
V = U + at
Substituting into the equation, we have
V = 0 + (-9.8*4)
V = -39.2m/s
Im just a little confused right now
Answer:
C
YExplanation:
