Answer:
Solve it
Explanation:
The formula for time is: T (period) = 1 / f (frequency). λ = c / f = wave speed c (m/s) / frequency f (Hz). The unit hertz (Hz) was once called cps = cycles per second.
there is a metal ball and ring set that is specially made so that at room temperature at the ball fits through the ring However when the ball is heated it gets stuck and cannot fit through anymore .why
Answer: Most objects expand when they take in heat for example get a metal sphere and put it next to a blow torch it would expand just enough to not fit in the ring anymore, but when it cools down it will go back to its original size releasing the energy
Explanation:
Describe how a radiation is similar to b- radiation
Complete question is;
Describe how α-radiation is similar to β-radiation?
Answer:
Explained below
Explanation:
The similarity between both alpha radiation and beta radiation is that in both cases, they both show deflection when they go through electric and magnetic fields. Although alpha deflects towards the negative plate while bets deflects towards the positive plate.
Secondly they both have high speeds. Just that alpha is from the helium nucleus while beta is from electrons.
20. If 4 X 1016 J of energy is released in a nuclear
reaction. Calculate the mass defect, Am (2 mark)
(A) 0.22kg (B) 0.44kg (C) 0.66kg (D) 0.88kg
I found this formula in an old book.
E = m · c²
It may be useful.
c = 3 x 10⁸ m/s
c² = 9 x 10¹⁶ m²/s²
4 x 10¹⁶ J = m · (9 x 10¹⁶ m²/s² )
m = (4 x 10¹⁶ J) / (9 x 10¹⁶ m²/s²)
m = 0.44 kg (choice-B)
What is the purpose of the antireflective coating on the glass layer of a solar
cell?
A. It keeps the solar cell from overheating.
B. It increases the charges on the semiconductors.
C. It provides better contact between the terminals.
D. It allows more solar energy to be absorbed.
The purpose of the antireflective coating on the glass layer of a solar
the cell is that It allows more solar energy to be absorbed, therefore the correct answer is option D.
What is solar energy?The energy emitted by the Sun as a form of thermal electromagnetic radiation is known as solar energy.
This solar energy is produced by nuclear fusion in the center of the Sun. Solar energy is a form of renewable source of energy.
As given in the problem statement we have to find out the best statement from the given options which describes the purpose of the antireflective coating on the glass layer of a solar cell.
In order to increase the amount of solar energy that can be absorbed, a solar cell's glass layer has an anti-reflective coating, therefore the correct answer is option D.
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Answer:
D
Explanation:
Newtons 1st law
What is the resistance to this unbalanced force in football?
Answer:
Newton's first law of motion states that an object's motion will not change unless an unbalanced force acts on the object. ... The football player in the photo above is in motion. He will stay in motion unless players on the other team exert an unbalanced force against him.
Explanation:
https://flexbooks.ck12.org/cbook/ck-12-middle-school-physical-science-flexbook-2.0/section/1.4/related/rwa/football-physics/
LINK
What are the key features of stem cell therapy?
Answer:
The two defining characteristics of a stem cell are perpetual self-renewal and the ability to differentiate into a specialized adult cell type.
Answer:
Stem cells have the ability to differentiate into specific cell types. The two defining characteristics of a stem cell are perpetual self-renewal and the ability to differentiate into a specialized adult cell type.
(Don't answer that there is no image, its a simple question)
If you have 2 of the 3 measurements of an object can you find the 3rd?
Explain:
Answer:
yes
Explanation:
of course indeed correct
The equation for centripetal force can be derived by substituting the equation for centripetal acceleration into Newton’s second law.
Please select the best answer from the choices provided
T
F
Answer:
True.
Explanation:
Newton's Second Law of Motion states that the acceleration of a physical object is directly proportional to the net force acting on the physical object and inversely proportional to its mass.
Mathematically, it is given by the formula;
Force = mass * acceleration
[tex] F = ma[/tex]
Centripetal acceleration is given by the formula;
[tex] Acceleration, a = \frac {v^{2}}{r}[/tex]
Where;
v is the velocity.
r is the radius.
The equation for centripetal force can be derived by substituting the equation for centripetal acceleration into Newton’s second law.
Let centripetal force be Fc
Fc = ma
Substituting the value of "a" into the above formula;
[tex] Fc = m \frac {v^{2}}{r} [/tex]
[tex] Fc = \frac {mv^{2}}{r} [/tex]
A car has 3600 J of kinetic energy and is going 3 m/sec. What is its mass?
Cancer can be treated with:
a) Radio waves
b) Infrared waves
c) Gamma wavesph
Answer: C. gamma waves.
Explanation:
:)
Newton determined that there is a direct relationship between force and mas
[tex] \\ [/tex]
Newton determined that there is a direct relationship between force and mass. Your weight equals your mass multiplied by the acceleration due to gravity. FALSE 8. A 10-kg object has greater acceleration due to gravity than a 5-kg object.
The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object
[tex] \\ [/tex]
Hope It Helps!
5. In an open system, for maximum work, the process must be entirely
a) irreversible
b) reversible
c) adiabatic
d) none of the mentioned
7. Which of the following is true for a closed system?
a) mass entering = mass leaving
b) mass does not enter or leave the system
c) mass entering can be more or less than the mass leaving
d) none of the mentioned
13. A piston cylinder contains 0.5 kg of air at 500 kPa and 500 K. The air expands in a
process so pressure is linearly decreasing with volume to a final state of 100 kPa and 300
K. Find the work in the process.
a) 56.1 kJ
b) 66.1 kJ
c) 76.1 kJ
d) 86.1 kJ
5- И
Land 279 At this state the
Mr. Rossi's car, stopped at the traffic lights, is hit by that of Mr. Bianchi. Then later in court, claims that he was traveling at 50 km / h, but Mr. Rossi
tthinks that mr. Bianchi was going much faster. After the collision the two cars got stuck and from the tracks on the asphalt it was possible to establish that, immediately after the collision, they were traveling at 30 km / h. Mr. Bianchi drove a car with a mass of 800 kg and Rossi a car with a mass of 1400 kg.
Does Bianchi tell the truth?
show explanation
Answer:
i need this too
Explanation:
A 0.10 kg stone is thrown from the edge of an ocean cliff with an initial speed
of 20 m/s. When it strikes the water below, it is traveling at 45 m/s. What is the
change in the kinetic energy of the stone?
Answer:
79.20 joule
Explanation:
1.
A 0.10kg stone is thrown from the edge of an ocean cliff with an initial speed of 21m/s. When it strikes the water below, it is traveling at 45m/s. What is the change in kinetic energy of the stone?
ΔEk = m/2*(V2^2-V1^2) = 0.05*(45^2-21^2) = 79.20 joule
The change in the kinetic energy of the stone is 81.25 J.
The given parameters;
mass of the stone, m = 0.1 kginitial speed of stone, u = 20 m/sfinal velocity of the stone, v = 45 m/sThe initial kinetic energy of the stone is calculated as follows;
K.E = ¹/₂mu²
K.E₁ = ¹/₂ x 0.1 x 20²
K.E₁ = 20 J
The final kinetic energy of the stone is calculated as follows;
K.E₂ = ¹/₂ x 0.1 x 45²
K.E₂ = 101.25 J
The change in the kinetic energy of the stone is calculated as follows;
ΔK.E = K.E₂ - K.E₁
ΔK.E = 101.25 J - 20 J
ΔK.E = 81.25 J
Thus, the change in the kinetic energy of the stone is 81.25 J.
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What is the potential energy of a 12 kg box on a 5 m high shelf?
Answer:6
Explanation:$’n
Wound coils of wire that function as magnets when an electrical current is passed through it is
called?
a. Temporary Magnets
b. Permanent Magnets
c. Electromagnets
d. Diamagnet
e. Paramagnet.
Question 17 of 25
Which term describes the transfer of energy from a hot object to a cooler
one?
A. Pressure
B. Density
C. Temperature
D. Heat
Answer:
D
Explanation:
heat is an energy that transfers from a hot body to cold body
D. Heat
What is heat?Heat is the transfer of kinetic energy from one medium or object to another, or from an energy source to a medium or object.
Such energy transfer can occur in three ways: radiation, conduction, and convection.
As heat is a form of energy, and therefore the SI unit of heat is also joules (J) which are defined as the amount of energy needed to raise the temperature of a given mass by one degree.
Heat is the transfer of energy from a warmer object to a cooler object.
For example, a lighted match (higher temperature object) will transfer heat to a large pan filled with lukewarm water (lower temperature object).
Therefore,
The term describes the transfer of energy from a hot object to a cooler one is Heat.
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16. An object with a mass of 20.0 kg has a force of 5.0 newtons applied to it. What is the resulting acceleration of the object?
Answer:
0.25m/s^2
Explanation:
F = ma
a = F/m
(Newton's Second Law)
1. A car travels along a straight road to the east for 100 meters in 4 seconds, then go the west for 50 meters in 1 second.
find the
a. Distance
b. Displacement
c. Time elapsed
Answer:
a.Distance = 150 m
b. Displacement = 50 m
Time lapsed = 5 seconds
Explanation:
a. Distance is the change in the position of an object.
The distance covered by the car = 100 + 50
= 150 m
b. Since displacement is a vector quantity,
Displacement of the car = 100 - 50
= 50 m due east
c. Time elapsed is the time taken for the motion of the car starting from when its starts to when it stops.
Thus, the time elapsed = 4 + 1
= 5 seconds
7) Lines of force are called?
Answer:
I'm pretty sure it's Electric Field Lines
Physics Help ASAP Please!
Answer:
23N
Explanation:
Answer:
9.3N
Explanation:
Fgrav = m • g = 14.7 N (g is 9.8 m/s/s)
a = v2 / R = (4 • Fgrav)/1 = 16 m/s/s
Fnet = m • a = 1.5 kg •16 m/s/s = 24 N, down
Fnet = Fgrav + Ftens, so
Ftens = Fnet - Fgrav
Ftens = 24 N - 14.7 N = 9.3 N
PLEASE HELP ASAP!!!
You and your 3 friends are driving down the road. All the wheels go flat at the exact
same time, that's not good. You have to use a 2,100 N force to push the car 4 meters to the side of the road. How much work did you do on the car?
A. 525 J
B. 2,104 J
С. 8,400 J
D. zero work since the car broke down
Answer:
D. Zero
Explanation:
A machine can only do work if it is operational
3. A school bus traveling at 22 m/s has a momentum of 150,000 kgm/s. What is the mass of the
bus? *
Answer:
Mass of bus = 6,818.18 kg (Approx.)
Explanation:
Given:
Velocity = 22 m/s
Momentum = 150,000 kg-m/s
Find:
Mass of bus
Computation:
Mass = Momentum / Velocity
Mass of bus = 150,000 / 22
Mass of bus = 6,818.18 kg (Approx.)
convert 592 minutes to seconds. using one step conversion.
Answer:
35520
Explanation:
592 times 60=35520
Objects 1 and 2 attract each other with a electrostatic force of 36.0 units. If the charge of Object 1 is doubled, then the new electrostatic force will be units.
If the charge on the object is doubled then the new electrostatic force is 72 units.
What does the term "electrostatic force" mean?Non-contact forces, such as electrostatic forces, pull or push on objects without actually making contact with them. When certain materials are rubbed together, a phenomenon known as "charge" can be transferred from one surface to another. Uncharged items are pulled by charged objects, which in turn may push or pull against other charged ones.
Let q and Q represent the charges on objects 1 and 2, respectively.
Charge Q is separated from charge q by a distance r, and their electrostatic attraction is given by:
F = kqQ/r²
where k is Coulomb's constant
According to the question:
F = 36 units
⇒ kqQ/r² = 36 units
Now, the charge on object 2 is doubled, so it now acquires a 2Q charge.
So the new electrostatic force will be:
F' = kq(2Q)/r²
F' = 2kqQ/r²
F' = 2F = 2×36
F' = 72 units
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Two 8.0 Ω lightbulbs are connected in a 12 V parallel circuit. What is the power of both glowing bulbs?
Answer:
96w
Explanation:
p=Iv..where v=12 and I=8.0
Jamal has a bowl of ice cream. He leaves it in the sun for too long and it melts into a liquid. Jamal then places the liquid ice cream into a freezer that is set at 5°F.
Which of the following best explains how the liquid ice cream will change in the freezer?
Answer:
It will turn back into a solid but it will take some time.
Explanation:
An airplane traveled for 15 hours at a velocity of 1100 km/hr. What distance
did the airplane travel. *
Your answer
Answer:
i have no clue
Explanation:
In a
boundary, the more dense
plate will move below the less dense plate
when the plates collide.
A. transform
B. divergent
C. convergent
Which circuit would have the most electrical power?
Answer:
c
Explanation: