Answer:
A. Copper wires
Explanation:
the the answer is copper wires because sound waves travel the slowest through gases, faster through liquids, and fastest through solids and copper wire is a solid.
3. You are walking at a 1m/s velocity and carrying a tray with a ball at rest on the tray. You come to a brief stop and the ball rolls off the tray. What causes the ball to roll off the tray?
Help ????????????????
Answer:
Inertia.
Explanation:
You are moving with a speed of 1 m/s. You are carrying a tray and the ball is at rest in the tray. You stops and the ball rolls off the tray. Whenever you starts moving with a speed of 1 m/s and when ball is at rest, due to inertia of motion the ball comes in motion. But when you stops, the ball is still in motion due to its inertia.
Hence, due to inertia the ball roll off the tray.
What is moment? What are the two factors which affect moment
Explanation:
moment is an expression involving the product of a distance and physical quantities.
-the size of force applied.
-the perpendicular distance from the pivot to the line of action of the force
How can Newton’s laws explain why the brain is in danger of injury when there is impact to the head?
Answer:
The brain moves inside the skull with a force equal and opposite to that of the impact.
Explanation:
the Velocity Ratio of a single movable Pulley is 2 why
Now the proton at B is removed and replaced by a lithium nucleus, containing three protons and four neutrons. The proton at location A remains in place. What is the magnitude of the electric force on the lithium nucleus
The magnitude of the electric force on the electron is 480 x 10⁻¹⁹ N .
How to calculate the magnitude?|F-->1| = E-->1 x charge on proton
= 300 x 1.6 x 10⁻¹⁹
Magnitude of the electric force on proton
|F-->1| = 480 x 10⁻¹⁹ N .
Inside the lithium nucleus , there are three protons so charge on it
= 3 x 1.6 x 10⁻¹⁹
= 4.8 x 10⁻¹⁹ C .
The magnitude of electric force on lithium nucleus
|F-->Li| = E-->1 x charge on lithium nucleus
= 300 x 4.8 x 10⁻¹⁹
= 1440 x 10⁻¹⁹ N .
Electron has same charge as that possessed by proton so charge on electron = 1.6 x 10⁻¹⁹ C
Magnitude of force on electron
|F-->1| = E-->1 x charge on electron
= 300 x 1.6 x 10⁻¹⁹
= 480 x 10⁻¹⁹ N .
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Complete question
A proton at location A makes an electricfield E-->1 atlocation B. A different proton, placed atlocation B, experiences a force F--->1.
If |E-->|= 300 N/C, what is |F-->1|?
|F-->1|= N
Now the proton at B is removed and replaced by alithium nucleus, containing three protons and four neutrons. Theproton at location A remains in place.
What is the magnitude of the electric force on the lithium nucleus?
|F-->Li| = N
Now the Lithium nucleus is removed, and an electron is placed atlocation B. The proton atlocation A remains in place. What is the magnitude of the electric force on the electron?
A ball is held at rest and then dropped. The final velocity of the ball was 45 m/s just before it hit the ground. How high was the ball when it was dropped?How much time past before the ball hit the ground?
Answer:
a) y = 103.21 m
b) t = 4.6 s
Explanation:
a) The height at which the balls was is given by:
[tex] V_{f}^{2} = V_{0}^{2} - 2g(y_{f} - y_{0}) [/tex]
Where:
[tex]y_{f}[/tex]: is the final height = 0
[tex]y_{0}[/tex]: is the initial height =?
[tex]V_{f}[/tex]: is the final velocity = 45 m/s
[tex]V_{0}[/tex]: is the initial velocity = 0 (is held at rest
g: is the gravity = 9.81 m/s²
Hence, the height is:
[tex] y_{0} = \frac{V_{f}^{2}}{2g} = \frac{(45 m/s)^{2}}{2*9.81 m/s^{2}} = 103.21 m [/tex]
b) The time before the ball hit the ground is:
[tex] V_{f} = V_{0} - g*t [/tex]
[tex] t = -\frac{V_{f}}{g} = -\frac{- 45 m/s}{9.81 m/s^{2}} = 4.6 s [/tex]
Therefore, 4.6 seconds passed before the ball hit the ground.
I hope it helps you!
why is skipping quicker than running
Answer:
because you are taking longer and faster strides
Explanation:
Answer:
you are taking longer to skip.
Explanation:
a.
To improve feelings about a poor test result, a student should
Beg the teacher for a second chance at the c. Ask their parents for assistance in persuading
test
the teacher to change a grade
b. Ask for an opportunity to earn extra creditd. All of these
Please select the best answer from the choices provided
A
B
ОООО
С
D
Answer:
Well, their are two answers in their. It would be Ask their Parent for assistance in persuading and Ask for an opportunity to earn extra credit:)
Explanation:
To improve feelings about a poor test result, a student should ask for an opportunity to earn extra credits. Hence, option D is correct.
How to handle disappointment at result?Remember that you are so much more valuable than a letter on a piece of paper. Your attitude, personality, and experience are things that future employers, coworkers, teachers, friends, and family are interested in. Even while practicing excellent self-care is always important, having a program in place will help you deal with any anxiety you may be experiencing in the future.
Start with the fundamentals, like eating healthily, Getting your five a day is a fantastic place to start Since it provides your body and brain with all the nutrition they require, and it can help you deal with any cortisol increases (stress). Additionally, ensure you get at least eight hours of sleep each night and consume six to eight glasses of water each.
To improve feelings about a poor test result, a student should ask for an opportunity to earn extra credits. Hence, option D is correct.
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If a honeybee is flying 7.0 m/s, what is the kinetic energy (Joules) if its mass is 0.1 g?
Answer:
KINETIC ENERGY=K.E=0.00245 Joules ≈ 0.003 Joules
Explanation:
mass=m=0.1g=0.0001kg
velocity=v=7.0m/s
kinetic energy=K.E.=?
as we know that
[tex]kinetic energy=\frac{1}{2}mv^2\\ putting values\\kinetic energy=\frac{1}{2}(0.0001kg)(7.0m/s)^2\\ kinetic energy=\frac{1}{2} 0.0049joules\\kinetic energy= 0.00245Newton meter or joules[/tex]
hope it will help ^_^
which three metal do you think might be present in alnico explain ? ans which one are magnetic
Answer:
Aluminium, Nickel, Cobalt and Iron plus varying levels of Copper, Titanium and Niobium.
MAGNETIC: Alni, Alcomax, Hycomax, Columax, and Ticonal.
A stone is thrown with an initial upward velocity of 7.0 m/s and experiences negligible air resistance. If we take upward as the positive direction, what is the velocity of the stone after 0.50 s?
Answer:
2.1 m/s
Explanation:
The following data were obtained from the question:
Initial velocity (u) = 7 m/s
Time (t) = 0.50 s
Final velocity (v) =?
Since the is thrown upward, it means that the stone is going against gravity. Thus, the value of the acceleration due to gravity will be negative i.e – 9.8 m/s²
Thus, we can obtain the velocity of the stone after 0.50 s as follow:
Initial velocity (u) = 7 m/s
Time (t) = 0.50 s
Acceleration due to gravity (g) = – 9.8 m/s²
Final velocity (v) =?
v = u + gt
v = 7 + (– 9.8 × 0.5)
v = 7 – 4.9
v = 2.1 m/s
Therefore the velocity of the stone after 0.5 s is 2.1 m/s.
An apple is falling from a tree. Disregarding air resistance, which diagram shows the free-body diagram of the force
or forces acting on the apple?
Answer: Second choice (straight down arrow)
Explanation:
I just did it.
Disregarding air resistance, the diagram showing the free-body diagram of the force or forces acting on the apple is second one.
What is free falling?When an object is released from rest in free air considering no friction, the motion is depend only on the acceleration due to gravity, g.
Given is an apple is falling from a tree.
When apple is falling down, the gravity will attract the apple towards the center of the Earth. Air resistance is not considered, otherwise it would be acting upwards.
Normal force will not act as apple in not placed on any kind of surface.
So, the only force acting is force of gravity also called as weight of apple.
Thus, the free-body diagram of the force or forces acting on the apple is second one.
Learn more about free falling.
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How do we represent Earth’s face?
Answer:
Human-driven changes in arrive utilize and arrive cover such as deforestation, urbanization, and shifts in vegetation designs moreover change the climate, coming about in changes to the reflectivity of the Soil surface (albedo), emanations from burning timberlands, urban warm island impacts and changes within the normal water cycle.
Figure shows three blocks that are being pulled along a smooth horizontal surface. The masses of the blocks
are shown in figure and tension force in cord connecting A and B = 120 N. The pulling force Fis:
A SZONB
C С
4kg 4kg 2kg
Fu
Smooth
(C) 125 N
(A) 50 N
(B) 100 N
(D) 200 N
Answer:
The pulling force F is 200 N
Explanation:
We note that the tension in a rope between two or three blocks is given by the relation;
Where we have;
m₁ → T₁ → m₂ → T₂ → m₃ → F
[tex]T_1 = \dfrac{m_1}{m_1 + m_2 + m_3} \times F[/tex]
[tex]T_2 = \dfrac{m_1 + m_2}{m_1 + m_2 + m_3} \times F[/tex]
m₁ = 2 kg
m₂ = 4 kg
m₃ = 4 kg
T₂ = 120 N
Therefore, by substitution, gives;
2 kg → T₁ → 4 kg → 120 N → 4 kg → F
[tex]120 \ N = \dfrac{2 \ kg + 4 \ kg}{2 \ kg+ 4 \ kg+ 4 \ kg} \times F = \dfrac{6 \ kg}{10 \ kg} \times F[/tex]
F = 120 N × (10 kg)/(6 kg) = 200 N
The pulling force F = 200 N.
870 kilograms to pounds
Answer:
870kg = 1,917.48 lbs
Explanation:
1 kilogram = 2.204 pounds
pounds = 870(2.204)
pounds = 1,917.48
I hope this helps!
-TheBusinessMan
Answer:
1918.35
Explanation:
multiply the value to mass... which is 2.205
so 870×2.205=1918.35
fastest to slowest: 5.0 m/s, -10.0 m/s, 520.0 cm/s, 18.0 cm/s ,2.0 cm/s
Given : We have given sets of speed 5.0 m/s, -10.0 m/s, 520.0 cm/s, 18.0 cm/s ,2.0 cm/s .
To Find : Order the given speed from fastest to lowest .
Solution :
First of all we have to convert all the given speed in same units .
We know , 1 m = 100 cm .
Therefore , speed in units cm/s is :
500 cm/s , -1000 cm/s , 520 cm/s , 18 cm/s , 2 cm/s .
We know , that -ve and +ve sign only indicates the direction .
So , comparing their magnitude , we get the order as :
-1000 cm/s , 520 cm/s , 500 cm/s , 18 cm/s , 2 cm/s .
Hence , this is the required solution .
2500m =_____km
480cm=_______m
75mL=______L
65g=________mg
5.6kg=_______g
50cm=______m
6.3cm=________mm
Answer:
1. 2.5km
2. 4.8m
3. 0.075 litre
4. 65000mg
5. 5600g
6. 0.5m
7. 63mm
Explanation:
1. 1000m in 1 km so divide by 1000
2. 100cm in m so divide by 100
3. 1000ml in 1l so divide by 1000
4. multiply the mass value by 1000
5.multiply the mass value by 1000
6. divide the length value by 100
7. multiply the length value by 10
hope this helps
The recommendations state that "members of the general public should not be exposed on a continuous basis to___________ electric field strengths exceeding 5 kV/m," or to magnetic fields exceeding 0.1 mT (1 gauss or 1,000 mG).
Answer:
electric field must not exceed 5000 V / m ( 5 kV/m)
Explanation:
All electrical equipment produces electric and magnetic fields that must be within the range recommended by WHO, the upper limit for the sum of all fields is
The electric field must not exceed 5000 V / m
to get an idea of the intensity produced by one of the devices that has the largest electric field in the radio with 180 V / m
Answer
A gas is taken in a vessel which is then sealed. The gas is then heated. How will the
temperature, pressure and volume of the gas change?
Since the vessel is sealed, all of
them will remain the same.
А
B
The temperature will increase,
the pressure and volume will
remain the same.
The temperature and pressure
will increase, the volume will
remain the same.
The temperature, pressure and
volume will all increase.
D
I
Answer:
B
Explanation:
heating increases the temperature, increase in temperature increases number of collisions hence increases pressure,volume still remains because there is no addition
Heating increases the temperature, increase in temperature increases the number of collisions hence increasing pressure, volume still remains because there is no addition
The answer is option B.
Does increasing temperature increase the number of collisions?Due to the fact the frequency of collisions depends on the temperature, A is virtually now not steady. Instead, A will increase slightly with temperature as the extended kinetic energy of molecules at higher temperatures reasons them to move barely faster and for that reason go through more collisions consistent with unit time.
The extent of the fuel consequently turns large because the temperature of the fuel will increase. As the number of gas particles increases, the frequency of collisions with the partitions of the box ought to grow.
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Jake drove 160 kilometres in 2 hours. What was his speed, in kmh-1
Answer:
80 kmh
Explanation:
IDK lol i just divided it by 2 because he drove 80 kilometres in one hour
Answer:
80kmph
Explanation:
speed = d/t
d= distance
t= time
s=160/2
s=80kmph
Using the same cost and time estimates, consider the time-effectiveness of each engineer.
If SciTech is most concerned about meeting a deadline regardless of the cost, which engineer should the company choose?
Camilla
John
Nora
Oracio
Answer:
Camilla
Explanation:
Answer:Camilla
Explanation:
Turner’s treadmill starts with a velocity of −3.0 m/s and speeds up at regular intervals during a half-hour workout.After 33 min, the treadmill has a velocity of −6.7 m/s. What is the average acceleration of the treadmill during this period? Answer in units of m/s^2
Explanation:
Acceleration is change in velocity over change in time.
a = Δv / Δt
a = (-6.8 m/s − (-3.0 m/s)) / (33 min × 60 s/min)
a = (-3.8 m/s) / (1980 s)
a = -0.0019 m/s²
Evaluate u + xy, for u = 1, x = 3, and y = 6.
why is MA always less than VR?
Answer:
[tex] \boxed{ \bold{ \boxed{ \sf{see \: below}}}}[/tex]
Explanation:
MA ( Mechanical Advantage ) is always less than VR ( Velocity Ratio ) because MA is reduced by friction but VR is not affected by friction.
Hope I helped!
Best regards! :D
the liquid pressure varies with depth why
Explanation:
Hey, there!
The liquid pressure varies with depth because liquid pressure is directly proportional to the depth of liquid from the free surface of the liquid. so, more the depth more the pressure and less the depth less the pressure.
Hope it helps...
1. Black Panther ran 567.6 km to the east in 23 hours then turned around and ran 221.8 km to the west in 1.2 hours. What was his average velocity during the trip in km h?p
Answer:
80.08 km/h
Explanation:
Given that Black Panther ran 567.6 km to the east in 23 hours
Velocity = distance covered/time
Substitute the distance covered and time into the formula
Velocity = 567.6/23
Velocity = 24.68 km/h
then turned around and ran 221.8 km to the west in 1.2 hours.
Velocity = 221.8/1.2
Velocity = 184.83 km/h
What was his average velocity during the trip in km/h ?
Average velocity = (V + U)/2
Since the two velocity are opposite to each other, the average velocity will be:
Average velocity = (-24.68 + 184.83)/2
Average velocity = 160.15/2
Average velocity = 80.08 km/h
Therefore, his average velocity during the trip is 80.08 km/h
QUESTION 5
A small beaker has 50 mL of water in it. A small frog with a mass of 20 grams is dropped into the beaker. The water level rises to 79
mL. What is the density of the frog? (You know the mass of the frog, first find the volume of the frog, then use the density formula to.
Answer:
0.69 g/cm^3
Explanation:
Given that a small beaker has 50 mL of water in it. A small frog with a mass of 20 grams is dropped into the beaker. The water level rises to 79mL.
The volume of the frog will be:
79 - 50 = 29mL
Convert it to litre by dividing it by 1000
29/1000 = 0.029 L
Since 1L = 1000 cm^3
Convert it to cm^3 by multiplying it by 1000
0.029 × 1000 = 29 cm^3
Density = mass/volume
Substitute the mass and volume into the formula
Density = 20/29
Density = 0.6896 g/cm3
Therefore, the density of the frog is 0.69 g/cm^3 approximately
What does Pascal's principle state?
A. The pressure at two pistons within an enclosed fluid system is
always the same.
B. The buoyant force on an object is equal to the weight of the fluid
displaced by the object.
C. The pressure of a fluid decreases as the speed of the fluid
increases.
D. The pressure exerted by a fluid decreases as depth increases.
An elevator has the mass of 3 tons of power needed to raise the elevator 50m in 15 s?
Answer:
Mass=3,time=15,height=50,g=10,Power=?.
Power=mgh/t.....3×10×15=1500/15=100Watts.
Answer:
[tex]\huge \boxed{\mathrm{100 \ Watts}}[/tex]
Explanation:
[tex]\sf \displaystyle P=\frac{mgh }{t} \\\\\\ P=power \ (W) \\\\ m=mass \ (kg) \\\\ g=gravity \ acceleration \ (m/s^2) \\\\ h=height \ (m) \\\\ t=time \ taken \ (s)[/tex]
[tex]\sf \displaystyle P=\frac{3 \times 10 \times 50 }{15}[/tex]
[tex]\sf \displaystyle P=\frac{1500 }{15}[/tex]
[tex]\sf \displaystyle P=100[/tex]
The atmospheric pressure on a mountain is 550 mmHg and 1 atm is equal to 760 mmHg. What is the pressure in atm? Give your answer to 2 significant figures760 mmHg what is the pressure in atm?
Answer:
0.72 atm
Explanation:
Given that the atmospheric pressure on a mountain is 550 mmHg.
Where 1 atm is equal to 760 mmHg.
To Convert millimetre mercury (mmHg) into atmospheric pressure units (atm) , divide the magnitude of pressure by 760. That is,
Pressure = 550/760
Pressure = 0.724 atm
Therefore, pressure in atm is 0.72 atm in two significant figures