Answers
Answer:its b
Explanation:
Related Questions
How can shorter string produce more fundamental frequency in two string of different length?
Answers
Answer:
Shorter string produces more frequency in two different strings because the equation for frequency is velocity/wavelength , this means that a shorter string creates a shorter wavelength which essentially increases the total frequency produced
Most metals have...
a. Atoms that are spread out, and low specific heats
b. Atoms that are close, and low specific heats
c. Atoms that are spread out, and high specific heats
d. Atoms that are close, and high specific heats
Answers
Sam is moving house and is carrying a 300N box of books up a flight of steps 5m high, it takes her 30 seconds. Gary follows her carrying a bag of clothes doing 1000 J of work; it only takes him 25 seconds. Who provides the biggest power? Show your working.
Answers
Answer: Sam provides the biggest power
Explanation: Power is defined, in Physics, as the rate of work done. Work is energy transferred to an object due to the force causing the displacement of the object.
So, to determine Power:
For Sam:
P = [tex]\frac{work}{time}[/tex]
[tex]P=\frac{F.d}{t}[/tex]
[tex]P=\frac{300.5}{30}[/tex]
P = 50 Watts
The unit for Power is [P] = J/s = Watt
For Gary:
P = [tex]\frac{work}{time}[/tex]
[tex]P=\frac{1000}{25}[/tex]
P = 40 Watts
Comparing power of Sam and Gary, we can conclude that Sam provides the biggest power of 50 Watts.
how would a position-time function look like for linearly increasing negative velocity regions?
Answers
Answer:
Hmmm
Explanation:
Here what I know... If a function gives the position of something as a function of time, the first derivative gives its velocity, and the second derivative gives its acceleration. So, you differentiate position to get velocity, and you differentiate velocity to get acceleration. where t is in seconds and H(t) is in inches.
Does this help?
A horizontal net force is exerted on a 2.0 kg object at rest. The object starts at x=0 m and travels 8.0 m along a horizontal frictionless surface.
What is the velocity of the object
Round answer to 2 significant digits
____ m/s
Answers
There's a constant force of 35 N exerted on the object of mass 2.0 kg, so it undergoes an acceleration a of
35 N = (2.0 kg) a → a = 17.5 m/s²
The object travels 8.0 m, so that it attains a velocity v of
v ² = 2 (17.5 m/s²) (8.0 m) → v ≈ 16.73 m/s ≈ 17 m/s
The velocity of the 2 Kg object which travels 8 m along the horizontal frictionless surface is 17 m/s
How to determine the acceleration Force (F) = 35 NMass (m) = 2 KgAcceleration (a) =?a = F / m
a = 35 / 2
a = 17.5 m/s²
How to determine the velocity Initial velocity (u) = 0 m/sDistance (s) = 8 mAcceleration (a) = 17.5 m/s²Final velocity (v) =?v² = u² + 2as
v² = 0² + (2 × 17.5 × 8)
v² = 280
Take the square root of both side
v = √280
v = 17 m/s
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Which list includes the phase changes that require a loss of energy (heat)?
a. sublimation and deposition
b. condensation, freezing and deposition
c. freezing and melting
d. melting, vaporization and sublimation
Answers
Answer:
b
Explanation:
because if you freeze somthing you do not gain heat you loss heat.
The distance that the pointer of a galvanometer moves depends on the amount of magnetism in the loops of the armature.
Please select the best answer from the choices provided
T
F
Answers
what do you understand by the term current state and define its SI unit.........
Answers
Answer:
Explanation:
Current refer to the rate at which electric charge flow or run or move in an electric circuit . It is measured in Ampere or coulumb per second.
The SI unit is Ampere and it is represented by A. It is a scalar quantity.
1 Ampere is the current that will produce an attractive force of 2 × 10^-7 Newton per meter of length between two parallel conductors.
When materials absorb heat, the kinetic energy of the particles _________?
a. increases
b. decreases
c. remains the same
Answers
Answer:
A
Explanation:
The atoms started to get "overly excited" and started to move faster than they usually do. When this happens, energy is released in the form of heat, light or etc. Because of this, kinetic energy increases and atoms colliding with each other happens more often.
Why is a protective apron or lab coat important to use when working with acids?
Acids conduct electricity and contact could cause a shock.
Acids react with lipids and can cause damage to skin tissue.
Acids break down fabrics and can cause burns if the acids are strong.
Acids have a slippery feel and could result in a fall.
Answers
Answer:
Acids break down fabrics and can cause burns if the acids are strong.
Explanation:
A protective apron or lab coat is important when working with acids because acids break down fabrics and can cause burns if the acids are strong.
An acid is a substance that interacts with water to produce excess hydroxonium ions in an aqueous solution. A strong acid ionizes completely in solution. When they come in contact with a fabric, they break them down violently. So, if they come in contact with the skin, it causes a violent break down of body tissues. The apron acts a protective layer.Answer:
C
Explanation:
I got it right
What is used to turn the pointer of a galvanometer?
a.
a crank
b.
an electric current
c.
a bar magnet
d.
a battery
Answers
Answer:
b. an electric current is used to turn the pointer of a galvanometer
Explanation:
well , galvanometer is an important device which is used to detect an electric current through a conductor or circuit.
something special about it is that it can detect very minute current too
Answer:
b
Explanation:
Evelyn is making a model of Earth to show how the physical layers correspond to the compositional layers. Which of the following should Evelyn show in her model?
The physical layers exactly match the compositional layers.-A
The crust is the only compositional layer not included in the physical layers. -B
The physical layers of the inner core and outer core form a single compositional layer. -C
The physical layer of the asthenosphere includes the compositional layer of the crust.-D
on a test need it asap.
I'll report u if u don't give the answer and just want the points.
Answers
Answer:
B
Explanation:
What is the Sl unit for momentum?
O kg• m
O kg
O kg• m
O kg
2
m
Answers
Explanation:
The S. I. unit of momentum is Kg. m/sechope it helps you
What is the explanation for the fact that the desert sand is very hot in the day and very cool at night? 1. Sand reflects light very well.
2. Sand is a bad heat conductor.
3. Sand has a low specific heat compared to air
Answers
define time in short answer
Answers
Answer:
measurable period during which an action, process, or condition exists or continues
Explanation:
Answer:
Time is the indefinite continued progress of existence and events that occur in an apparently irreversible succession from the past, through the present, into the future.
Explanation:
hope it helps...
Which of the following is an example of kinetic energy?
athlete running in a race
battery charging in a garage
apple hanging from a tree
water boiling on a stove
Answers
Answer:
A. Athlete running in a race
Explanation:
Kinetic energy haves something to do with movement
Why: I took the test
Name two sub-kingdoms of plant kingdoms
Answers
Answer:
⭐. cryptogams ( non-flowering & non-seed bearing)
⭐. phanerogams ( flowering & seed bearing)
please help me answer these
Answers
A bungee jumper starts with 1000 J in their GPE store. After they jump they fall and are brought to a stop with the bungee cord. With the cord fully stretched what is the energy in the EPE store?
Answers
Answer:
energy is equal to 1000 J
Explanation:
When the jumper is in the tent, he has a given height, this height gives him a gravitational potential energy, which forms his initial mechanical energy of 1000 J. After jumping, this energy is converted into elastic energy of the rope plus a remainder of potential energy gravitational, it does not reach the ground, but as the friction is negligible the total mechanical energy is conserved, therefore its energy is equal to 1000 J
This is a case of energy transformation, but the total value of mechanical energy does not change
I am giving 18 points. Please try and don’t just do it for the points.
They won’t let me shown the very last picture, it looks like the normal L shape that is in every picture, and just one straight line. L—
Like that.
Which of the following graphs below represents the motion of an object at variable speeds? (3 points)
Distance
(miles)
Time
(hours)
Distance
(miles)
Time
(hours)
Answers
Answer:Distance.
Explanation:
The box is applying 22 N of force on the table, but the box is not moving 22 N If there is a downward force of 22 N, why is the box not moving downward?
Answers
Answer:
A reaction force
Explanation:
The box is not moving downward because the table is applying an equal and opposite amount of force on the box.
This is the premise of Newton's third law of motion which states that "action and reaction are equal and opposite".
The action force impacted by the downward pull on the table is being cancelled out by the upward force of the table.
The net force in the vertical direction will therefore be 0N This way, the box does not move downward.A funnel shaped low pressure system that is typically associated with strong thunderstorms is a(n)_______. *
Answers
Tornadoes are narrow, funnel-shaped spirals of rapidly rotating air that form in association with thunderstorms. And they are also near-circular low pressure systems.
Answer:
Tornadoes
A tornado is a violently rotating column of air that is in contact with both the surface of the Earth and a cumulonimbus cloud or, in rare cases, the base of a cumulus cloudExplanation:
A sound wave traveling through dry air has a frequency of 16 Hz, a
wavelength of 22 m, and a speed of 350 m/s. When the sound wave passes
through a cloud of methane, its wavelength changes to 28 m, while its
frequency remains the same. What is its new speed? (The equation for the
speed of a wave is v= f x.)
A. 350 m/s
B. 9,800 m/s
C. 450 m/s
D. 13 m/s
Answers
Answer:
C. 450
it should be right
The new speed of sound wave is 450 m/s. Hence, option (C) is correct.
What is sound wave?A sound wave is the pattern of disruption brought on by the movement of energy moving through a medium as it propagates away from the source of the sound (such as air, water, or any other liquid or solid matter).
Pressure waves are produced when an object vibrates, such as a ringing phone, and these waves are known as sound waves.
Frequency of sound wave is = 16 Hz.
Wavelength of the sound wave is = 28 m.
Hence, new speed of sound wave is = 16 × 28 meter/second
= 448 meter/second
=450 meter/second. (approx.)
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if an object with a mass of 248kg is lifted 76 meters in 18 seconds, how much power is used?
Answers
Explanation:
power = 1/2 mass × velocity^2 >>1
velocity = distance / time = 76 /18 = 4.2m
then power = 1/2 × 276 × (4.2)^2 = 138 × 17.64 = 2,434.3 jules.
Which of the following formulas is the correct equation for the law of Universal gravitation?
Answers
Answer:
F = GMm / r²
from Newton's law of gravitational attraction
Given the impulse acting on an object and the impact time which equation can be used to calculate the force applied to an object
Answers
Answer is D
Ndmdjdndbdjdkskd
The impulse acting on an object and the impact time, the equation F= I / Δt can be used to calculate the force applied to an object, therefore the correct answer is D.
What is impulse?The product of the average applied force and the time for which it is exerted is known as an impulse.
the mathematical relation for impulse is
Impulse = F * Δt
where F represents the force applied and Δt represents the time for which the force is applied
Thus, the correct equation that can be used to calculate the force applied to an object is F = I /Δt and the correct option is D.
Learn more about impulse, here
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In an open circuit ____________.
Question 34 options:
a light bulb would produce light
current will flow
current will not flow
more than one resistor is in the circuit
a resistor controls the flow of current
Answers
Answer:
The current will not flow
Explanation:
An open circuit is a circuit that is not complete it has an opening Therfor the current can not flow.
the human body station 2
Answers
Answer:
...?
Explanation:
Un consumator electric conectat la o tensiune de 220V are rezistenta electrica R=100ohmi Ce putere electrica are consumatorul? 1 point 484W 220W 440W
Answers
Explain how the law of conservation of energy applied to the energy transformations that occur from the outlet charger to the ringing phone
Answers
Answer: ELECTRICAL ENERGY to CHEMICAL ENERGY to SOUND ENERGY.
Explanation:
There are laws governing the conservation of energy in physics. The first law of thermodynamics states that in a closed system, energy can neither be created nor destroyed during transformation. With this, the total energy of a given system always remains constant.
This first law of thermodynamics which arouse from special relativity, says that changes in the energy of systems will also coincide with changes in a measure of its energy content.
The ELECTRICAL energy from the outlet charger is transformed and stored as CHEMICAL energy in the battery of the phone. This in turn is converted to SOUND energy when the phone rings.