Answer:
21. A box is at rest at the top of a frictionless inclined plane. As the box slides down the ramp where along the ramp would the box have half of its orginial potential energy?
Halfway down the ramp
When it is at half of its maximum velocity
When it is at half of its total trip time
A ball of mass M and speed of V collides head on with a ball of mass 2M and a speed of v/2, as
shown above. If the two balls stick together, their speed after the collision is
Answer:
2/3V
Explanation:
Given that a ball of mass M and speed V collides with another ball of mass 2M and velocity v/2 . After collision they stick together and we need to find their speed after collision . According to Law of Conservation of Momentum , The total momentum of the system before and after collision is constant .That is ;
[tex]\sf\qquad\longrightarrow m_1u_1+m_2u_2=m_1v_1+m_2v_2\\ [/tex]
[tex]\sf\qquad\longrightarrow MV + 2M\bigg(\dfrac{V}{2}\bigg) = (2M + M)(v)\\ [/tex]
[tex]\sf\qquad\longrightarrow MV +MV= 3Mv\\[/tex]
[tex]\sf\qquad\longrightarrow 2MV = 3Mv\\ [/tex]
[tex]\sf\qquad\longrightarrow v =\dfrac{2M}{3M}V\\ [/tex]
[tex]\sf\qquad\longrightarrow \pink{ v_{after\ collision}=\dfrac{2}{3}V }[/tex]
Hence the velocity after the collision ia 2/3V .
What force (or forces) act on a stone shot up in air?
Answer:
gravitational force and the air friction
Explanation:
when there is air drag, the forces acting on the projectile are the gravitational force and air friction.
if weight AB is compressed by 5% of its current length and all joints are free moving, what effect will raising the hook by exactly 1 meter have on it?
Raising the hook, or load by exactly 1 meter, will allow the length of the compressed material regain its original length, provided it wasn't deformed by the 5% compression.
Hooke's law
Hooke's law states that the force applied to an elastic material is directly proportional to the extension of the material provided that the elastic limit of the material is not exceeded.
When the length of the material is compressed by 5%, the material will regain its original size and shape when the applied load is removed, if the material was not deformed by the compression.
Thus, raising the hook, or load by exactly 1 meter, will allow the length of the compressed material regain its original length, provided it wasn't deformed by the 5% compression.
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What is the difference between memos and emails?
O a. Memos are usually sent online and emails are usually sent on hard copy to inform an action
b. Memos are used for internal messages and emails can be used for external communication
O c. Emails are used for longer reports and memos are used for short reminders and replies
O d. Emails are used for formal reports and proposals and memos are for informal ideas
What do I need to build a time machine to turn time back.. or who knows someone who has information to do so..
Circle the letter of the correct answer.
1.) c
2.) d
3.) d
4.) b
5.) c
How we can see different colors by our eyes?
I DID A Science PROJECT ON THIS >:)))
basically light travels into the eye to the retina located on the back of the eye. the retina is covered withe millions of light sensitive cells called Rods and cones. when these cells detect light they send signals to the brain that help detect color.
the color of an object is determined by the wavelengths of light that it reflects. it's determined by the arrangement of electrons in the atoms of that substance that will absorb and re-emit photons of particular energies according to quantum laws.
What is the maximum possible age of the universe if H0=80km/s/Mpc
A ball is thrown upwards. Neglecting air resistance, what initial upward speed does the ball need to remain in the air for a total time of 10 seconds
Answer:
H = 1/2 g t^2 time to reach top of trajectory
v = g t time to reach top of trajectory when v is initial speed upwards
v = 5 g = 49 m/s 5 sec upwards and 5 sec downwards
How would the products of electrolysis be different is a solution of zinc chloride was used instead of molten zinc chloride?
Answer:
The electrolysis of zinc chloride shows how an ionic salt will conduct electricity when molten, but not when solid.
Explanation:
hope this helps!!!! GOOD LUCK!!!!
2. Which of the following is NOT true of work?
(A) It is the scalar product of force and displacement.
(B) It is measured in joules.
(C) It has the same units as energy.
(D) It is a vector which is always in the same direction as the displacement.
(E) It takes energy to perform work
Answer:
D
Explanation:
Work is not a vector but it is a scalar
Answer:
D
Explanation:
D. its is a vector which is always in the same direction as the displacement
The average distance from earth to the sun is 150,000,000 km what is the name of the unit scientists created that is equal to the distance from earth to the sun
Answer: The name of the unit is A.U's(Astronomical unit)
Explanation:
Please help me find this answer
Answer:
155/62 = 2.5
Mass/Volume = Density
Density= 2.5
Explanation:
The efficiency of the solar panel is 70%. Calculate the power of the solar radiation incident on the panel.
The incident power of the solar radiation is 1,185.6 W.
Thermal energy gained by the waterThe thermal energy gained by the water is calculated as follows;
Q = mcΔθ
Q = 0.019 x 4200 x (72 - 20)
Q = 4,149.6 J
Power of the solar radiation incident on the panelThe incident power of the solar radiation is calculated as follows;
[tex]0.7\times P = \frac{Q}{t} \\\\P = \frac{Q}{0.7t} \\\\P = \frac{4149.6}{0.7 \times 5} \\\\P = 1,185.6 \ W[/tex]
Thus, the incident power of the solar radiation is 1,185.6 W.
The complete question is below
In 5.0 s, 0.019 kg of water flows through the tubes of a solar heater. The temperature of the water increases from 20 °C to 72 °C. The specific heat capacity of water is 4200 J / (kg °C). Calculate the thermal energy gained by the water in 5.0 s.
The efficiency of the solar panel is 70%. Calculate the power of the solar radiation incident on the panel.
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How should you solve this question. Thank you!
Explanation:
a)
R total= R1 + R2 + R3 = 50 + 25 + 10 = 85
I = V/R total = 27/85 A
V1 = IR1 = 27/85 × 50 = 270/17 v
V2 = IR2 = 27/85 × 25 = 135/17 v
V3 = IR3 = 27/85 × 10 = 54/17 v
b)
R1,2 = R1.R2/(R1+R2) = 50 × 25/75 = 50/3
R total = R1,2.R3/(R1,2 + R3) = 50/3 × 10/( 50/3 + 10) = 500/80 = 25/4
I = V/R = 27/(25/4) = 108/25 A
V1 = V2 = V3 = V = 27 v
I1 = V/R1 = 27/50 A
I2 = V/R2 = 27/25 A
I3 = V/R3 = 27/10 A
When the potential difference between the plates of a capacitor is increased by 3.50 V , the magnitude of the charge on each plate increases by 15.0 μC . What is the capacitance of this capacitor in μF?
Answer:
42.9 μF
Explanation:
V = 3.50 V, Q = 150 μC
C = Q/V = 150/3.50 μF = 42.9 μF
Your washer has power of 450 watts, and your dryer has a power of 3000
watts. How much energy do you use to clean a load of clothes in 1 hour of
washing and 1.5 hours of drying?
Answer:
4950 watt hours.
Explanation:
450*1 + 3000*1.5 = 4950w
what is mirror formula??
[tex] \huge \frac{1}{v} + \frac{1}{u} = \frac{1}{f}[/tex]
where,
v:distance of the image from the lens
u:distance of the object from the lens;
f:focal length,
what is the velocity of a 0.145kg baseball if its kinetic energy is 109 j
Answer:
The velocity of the 0.145 kg baseball is 38.7743 m/s.
General Formulas and Concepts:
Energy
Kinetic Energy Formula: [tex]\displaystyle KE = \frac{1}{2}mv^2[/tex]
m is mass (in kg)v is velocity (in m/s)KE is kinetic energy (in J)Explanation:
Step 1: Define
Identify.
m = 0.145 kg
KE = 109 J
Step 2: Solve for v
Substitute in variables [Kinetic Energy Formula]: [tex]\displaystyle 109 \ \text{J} = \frac{1}{2}(0.145 \ \text{kg})v^2[/tex]Simplify: [tex]\displaystyle 109 \ \text{J} = (0.0725 \ \text{kg})v^2[/tex]Isolate variable term: [tex]\displaystyle 1503.45 \ \text{J/kg} = v^2[/tex]Isolate v: [tex]\displaystyle v = 38.7743 \ \text{m/s}[/tex]Topic: AP Physics 1/C
Unit: Energy
velocity ratio of a machine is 4 what does it mean
Answer:
It means that the velocity of the machine is 4
according to the law of conservation of momentum, when objects collide in the absence of friction
Answer:
When two objects collide, in the absence of any additional external forces acting on the pair of objects, momentum is conserved precisely because the collision is just an interaction between the two objects. That is, it's a Newton's third law problem.32. A ball is going to fall downward through a vacuum chamber. If it has maximum potential energy at the top and maximum kinetic energy at the
bottom where along the fall will half of its maximum velocity occur?
A: At exactly halfway down
B: At more than halfway down (between halfway and the bottom)
C: At less than halfway down (between halfway and the top)
Half maximum velocity occurs at the point of half maximum kinetic energy which is exactly halfway down.
Conservation of energyThe principle of conservation of energy states that energy can neither be created nor destroyed but can be converted from one form to another.
M.A = K.E + P.E
At the maximum height, the kinetic energy of the ball while potential energy is maximum.
At the half-way down, the ball kinetic energy of the ball is equal to the potential energy.
Thus, half maximum velocity occurs at the point of half maximum kinetic energy which is exactly halfway down.
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Which statement best describes the electric field?
A. The units are newton-coulombs, and the arrows indicate the direction that a negative charge placed in the field would feel a force
B. The units are newtons per coulomb, and the arrows indicate the direction that a negative charge placed in the field would feel a force.
C. The units are newton-coulombs, and the arrows indicate the direction that a positive charge placed in the field would feel a force.
D. The units are newtons per coulomb, and the arrows indicate the direction that a positive charge placed in the field would feel a force.
Answer:
D
Explanation:
Which of the following is NOT a source of water pollution?
a. factory runoff
c. fertilizers
b. washing your car
d. oil spills
Three equal in magnitude charges are located at the corners of an equilateral
triangle of side r. The charges A and C are positive and charge B is negative.
What is the direction of the net force on charge C due to charges A and B?
(A) up to the right
(B) up
(C) right
(D) down
The direction of the net force is up.
Net force on the chargesThe net force on the charges can be determined using Coulomb's law as follows;
[tex]F_{AC} = + \frac{KQ^2}{r^2}[/tex]
[tex]F_{BC} = - \frac{KQ^2}{r^2}[/tex]
F(net) = F(AC) + F(BC)
F(net) = 0
The, direction of the net force on charge C will be parallel to charge C to achieve a zero net force. Thus, the direction of the net force is up.
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Pleeasse solve it ill give brainliest please
Answer:
a) 210 Ω
b) 21 V
c) 0.07 A, 0.03 V
d) VAE = 7 V
VEB = 14 V
VAF = 9 V
VFB = 12 V
Explanation:
a) 100 Ω and 200 Ω are in series, equivalent = 100 + 200 = 300 Ω,
300 Ω and 400 Ω are in series, equivalent = 300 + 400 = 700 Ω
300 Ω and 700Ω are in parallel, so the equivalent resistance between A and B is R where
1/300 + 1/700 = 1/R, get R = 210 Ω
b) Given I = 0.1 A
so VAB = I * R = 1 * 210 = 21.0 V
c) I₁ + I₂ = I = 0.1, so I₂ = 0.1 - I₁
I₁ * 300 = I₂ * 700
I₁ * 300 = (0.1 - I₁) * 700
get I₁ = 0.07 A, I₂ = 0.1 - I₁ = 0.03 A
d) VAE = I₁ * 100 = 7 V
VEB = I₁ * 200 = 14 V
VAF = I₂ * 300 = 9 V
VFB = I₂ * 400 = 12 V
HELLLPPPPPP PLEASEEEE ANSWWERRR THE QUESTION USING PHET's COULOMB'S LAW SIMULATION:
Question:
How does changing the charge’s value influence the force between the two charges?
is it a multi or is it writing
reasons why X-rays are used in crystallization
Answer:
The reason X-rays are used in this process is because the clouds of electrons are at the same scale as the X-ray radiation wavelength. This means that the radiation is deflected and scattered by the electrons of the atoms in the crystal. The deflected X-ray beams produce a scattering distribution which is proportional to the scattering angle.
Explanation:
Answer:
Because X-rays have wavelengths similar to the size of atoms, they are useful to explore within crystals. Thus, since X-rays have a smaller wavelength than visible light, they have higher energy. With their higher energy, X-rays can penetrate matter more easily than can visible light.
Explanation:
A disk at rest experiences constant angular acceleration for t = 25 s, at the end of which it is spinning with a frequency of f = 55 rpm. Please answer the following questions.
A)Write a general expression for the magnitude of the angular velocity of the disk after the acceleration in terms of frequency.
B)Calculate the magnitude of the angular velocity of the disk in rad/s at time t = 25 s.
C)Write a general expression for the average angular acceleration of the disk αave in terms of angular velocity.
D) Calculate the magnitude of the average angular acceleration of the disk αave from rest to t = 25 s in rad/s2.
E)Write a general expression for the period T of the disk in terms of frequency f.
F)Calculate the magnitude of the period of the disk T at time t = 25 s in seconds.
(a) A general expression for the magnitude of the angular velocity of the disk is 2πf.
(b) The magnitude of the angular velocity of the disk is 5.76 rad/s.
(c) A general expression for the average angular acceleration of the disk is ω/t.
(d) The magnitude of the average angular acceleration of the disk is 0.23 rad/s².
(e) A general expression for the period T of the disk is 1/f.
(f) The magnitude of the period of the disk is 0.17 s.
Angular velocity
The angular velocity of the disk is the rate of change of angular displacement with time.
ω = 2πf
where;
f is the frequency
[tex]\omega = 2\pi \times 55\frac{rev}{\min} \times \frac{1 \min}{60 \ s} = 5.76 \ rad/s[/tex]
The angular velocity of the disk at time, t = 25 s is 5.76 rad/s.
Average angular acceleration of the disk[tex]\alpha = \frac{\Delta \omega }{t} \\\\\alpha = \frac{5.76}{25} \\\\\alpha = 0.23 \ rad/s^2[/tex]
Period of the diskT = 1/f
T = 1/5.76
T = 0.17 s
Thus, the period of the disk at time t = 25 s is 0.17 s.
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HELP!!!!!!!!!!!!!!!!!!! Which best describes an example of a p-type semiconductor?
It uses arsenic so that electrical conduction is due to the movement of electrons.
It uses arsenic so that electrical conduction is due to the movement of a positive charge.
It uses boron so that electrical conduction is due to the movement of electrons.
It uses boron so that electrical conduction is due to the movement of a positive charge.
UPDATE: THE ANSWER IS D
Answer:
D
Explanation:
The best description of a p-type semiconductor is It uses boron so that electrical conduction is due to the movement of a positive charge.THe correct option is D.
What is a p-type semiconductor?A p-type semiconductor is created by doping a pure semiconductor material, such as silicon, with an impurity that has one less electron than the semiconductor. Boron, which has three valence electrons, is commonly used as a dopant to create p-type semiconductors.
When boron atoms are introduced into a pure semiconductor material such as silicon, they create "holes" in the crystal lattice structure. These holes can be thought of as vacancies where an electron would normally be. The holes are positively charged and can move around the crystal lattice structure. When an electric field is applied to the p-type semiconductor, the holes move towards the negative electrode, and this movement of holes is what causes electrical conduction in a p-type semiconductor.
Therefore, the statement that best describes an example of a p-type semiconductor is "It uses boron so that electrical conduction is due to the movement of a positive charge."
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