Answer:
more massive objects fall faster than less massive objects because they are acted upon by a larger force of gravity
Explanation:
A sound wave with a power of 8.8 × 10–4 W leaves a speaker and passes through section A, which has an area of 5.0 m2.
What is the intensity of sound in this area? (Intensity = I = )
1.8 × 10–4 W/m2
1.8 × 10–6 W/m2
1.6 × 10–4 W/m2
1.6 × 10–6 W/m2
Mark this and return
Answer: 1.8 x 10-4 W/m^2
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
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 ball is dropped from rest from the top of a building. What force is responsible for the downward motion of the ball?
the force of gravity
the force of tension
the normal force
the pushing force
please help
Answer: The force of gravity
Please help me........
Answer:
.
Explanation:
Answer:
the pelvice
Explanation:
what is meant by the term moment in "physics".
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
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
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!!
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.
PLEASE LOL I NEED IT NOW!
Answer:
C
Explanation:
I did this on edge an that was the answer
I need help on this question please answer within like a PLEASE QUICK HELP
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!
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
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 .
Learn more about specific heat capacity,here:
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A pendulum is transported from sea-level, where the acceleration due to gravity g = 9.80 m/s2, to the bottom of Death Valley. At this location, the period of the pendulum is decreased by 5.00%
Answer:
[tex]g'=10.78\ m/s^2[/tex]
Explanation:
The time period of a simple pendulum is given by :
[tex]T=2\pi \sqrt{\dfrac{L}{g}}[/tex]
L is length of the pendulum and g is acceleration due to gravity
At the bottom of Death valley, g = 9.8 m/s²
We need to find the value of g if the period of the pendulum is decreased by 5.00%.
T'=(T-0.05T)= 0.95 T
[tex]T\propto \dfrac{1}{\sqrt{g} }\\\\\dfrac{T}{T'}=\sqrt{\dfrac{g'}{g}}\\\\\dfrac{T}{0.95T}=\sqrt{\dfrac{g'}{9.8}}\\\\\dfrac{1}{0.95}=\sqrt{\dfrac{g'}{9.8}}\\\\1.1=\dfrac{g'}{9.8}\\\\g'=10.78\ m/s^2[/tex]
So, the new value of acceleration due to gravity is [tex]10.78\ m/s^2[/tex].
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
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.
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.
To solve more questions on Circular motion, visit the link below-
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8. List three temperature scales. Then write the boiling and freezing
points of water one each scale.
Explanation:
For most temperature scales, the boiling point of water and the freezing point is used to calibrate it.
Three known temperature scales;
Kelvin scale Celcius scale Fahrenheit scaleKelvin scale Celcius scale Fahrenheit scale
Freezing point 273K 0°C 32°F
Melting point 373K 100°C 212°F
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].
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
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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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
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
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]
A 25 kg rock falls for 2.7 seconds. How many meters tall was the building?
Answer:
35.7m
Explanation:
Given parameters:
Mass of rock = 25kg
Time of fall = 2.7s
Unknown:
Height of the building = ?
Solution:
To solve this problem, we will use one of the motion equations;
S = ut + [tex]\frac{1}{2}[/tex] gt²
S is the height
u is the initial velocity = 0m/s
t is the time
g is the acceleration due to gravity
S = (0 x 2.7) + [tex]\frac{1}{2}[/tex] x 9.8 x 2.7² = 35.7m
Im just a little confused right now
Answer:
C
YExplanation:
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? Question 4 options: 16 m/s 4 m/s 4 km 16 km
Answer:
4km
Explanation:
Distance=speed x time
Knowing this we know the time and speed
so it is 8 x .5= D
And 8 x .5 =4
If you have any questions let me know
Which statement best describes the importance of joints in the roadways of Bridges ?
a. Joints strengthen the roadway to support cars and trucks
b. Joints allow the roadway to expand and contract with varying outside temperatures
c. Joints allow the roadway to expand and contract as cars put force on the bridge
d. Joints allow the bridge to be built in smaller, easier to assemble pieces.
Answer:
i think it's a or c hope it helps :)
Explanation:
u don't have to give brainliest tho it's fine save ur points :)
