A stone is dropped from top of a tower. If it takes 6 sec to hit the ground, find the height of tower and velocity with which the stone hits the ground ?
Answer:
Explanation:
s = ut+ 0.5at²
u = 0
t = 6
a = 9.81
s = 0 + 0.5 * 9.81 * 36 = 176.58 m
v = u + at
v = 9.81* 36 = 353 m/s
What is the difference between a scaler and vector quantity?
Answer:
A scalar quantity is a quantity that has magnitude but does NOT have direction. An example is speed.
While a vector quantity is a quantity that has BOTH magnitude and direction. For example, force.
Can anybody write a short poem about friction
What must be true in order for magnetism to induce an electric current in a wire?
Answer:
The wire must be part of a closed circuit.
Explanation:
A closed circuit in electric is what we called a wire that has a complete electrical connection in which electricity flows, where electric current flow from one end to another, in order for magnetism to induce an electric current the circuit has to be closed, or no current will flow.
is the fastest launch coaster in the world, launching its 3864 kg trains to 240 km/h (149 mph) in 4 seconds. This means its rate of acceleration is 16.67 m/s/s. How much force was required to do this?
Answer:
64 412 .88 N
Explanation:
F = ma
= 3864 kg * 16.67 m/s^2 = 64412.88 N
a ship's sonar sends messages and receives the echoes from the ocean bottom 0.6 seconds after the sound is sent down from the ship.how Deep is the water beneath the ship? (Given speed of sound in still water = 1450m/s)
Answer:
Speed of Sound = 2D
Time
Where D is the depth of water
2D = Speed × Time
2D = 1450m/s × 0.6s
D = 1450m/s × 0.6s
D
Depth D = 870m
PLEASE HELP
Which of the following best describes the relationship between kinetic energy
(movement) of particles/molecules and temperature?
As kinetic energy decreases, temperature increases.
kinetic energy ingreases, temperature also increases.
Kinetic energy has no
effect on temperature.
As kinetic energy increases, temnerature
Answer:
As the kinetic energy increases, temperature also increases
(Measurement of Resistance) Current causes the temperature of a real resistor to increase. Why? What effect does this heating have on the resistance? Explain.
Resistance in the wire increases when the temperature of the wire is increases.
What effect does this heating have on the resistance?Heating the metal conductor causes atoms to vibrate more that makes more difficult for the electrons to flow through the conductor and thus increasing resistance.
So we can conclude that resistance in the wire increases when the temperature of the wire is increases.
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Complete the sentence: Congruent means ____________________.
too long
opposite
uneven
equal
Answer:
equal
Explanation:
If all three corresponding sides are equal and all three corresponding angles are identical in measure, two triangles are said to be congruent. These triangles can be slides, rotated, flipped and turned to be looked identical. If repositioned, they coincide with each other. The symbol of congruence is' ≅'.
Congruent means equal, as it is a term used to describe two or more objects or figures that have the same shape and size.
When two or more figures or things have the same size and shape, they are said to be congruent.
When we state that two things or figures are congruent, we mean that their lengths, angles, and proportions are all the same.
The idea of congruence is that there should be no distinction or contrast between the things being compared. It denotes complete equality and a perfect match.
Congruence informs us that all geometric shapes, including line segments, angles, triangles, and others, are the same and can be placed on one another without overlap or gaps.
Thus, a fundamental idea in geometry called congruence enables us to evaluate and contrast geometric forms and their characteristics.
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The attraction or repulsion between charges is known as _____.
electric charge
electric force
magnetism
the electric field
Answer:
Okay
It is electric charge
what can you observe about c02 concentrations over the course of a year
All of the following use subjective scoring EXCEPT:
A. Diving
B. Figure Skating
C. Archery
D. Gymnastics
All of the following use subjective scoring EXCEPT Archery.
Subjective scoring is an important and powerful tool you can use to add assessment items that are not easily scored.
Archery is scored based on point values that is assigned to the rings made on the target. Others are not point scoring sports.
Thus, all of the following use subjective scoring EXCEPT Archery.
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A driver parks his car on a hill but forgets to put
the brakes on. The car starts to roll down the hill
Which of the following energy transformations
occurs as the car rolls down the hill?
Answer:
Both potential energy and kinetic energy are involved.
Explanation:
As the car is rolling, its potential energy decreases and its kinetic energy increases.
Explain why a lorry loaded with bags of maize packed high up is likely to topple when negotiating a corner.
Answer:
Due to its centre of mass being too high and because of that it is at a high risk of toppling at the corner
What is the absolute potential at apoint which is 15cm from an isolated point charge q=_3×10^_7c in vacuum
Answer:
q = 1
Explanation:
q-3/10-(7/10)=0
3 7
(q - ——) - —— = 0
10 10
What are data?
A. Pieces of information recorded in an experiment
B. Sources that summarize a primary source
C. Educated guesses about the outcome of an experiment
D. Variables that are adjusted by the experiment
Answer:
educated guesses about the outcome of an experiment
True or false: In order to create a sound wave, work must be done.
True - Because a sound wave carries energy; to propagate energy, energy must be applied for the sound wave to carry energy.
Select all the correct answers.
When people use plastic combs on their hair, the combs become negatively charged. Which statements about this situation are true?
The comb loses electrons.
The comb gains electrons.
The hair loses electrons.
The hair gains protons.
The hair loses protons.
Answer:
so therefore, the comb gains electron and the hair losses electrons
Explanation:
It is known that electron contain a negative charge.
So, when an atom gain electrons then number of electrons within the atom increases. As a result, the atom acquires a negative charge.
But when an atom loses electrons, there will be deficiency of electrons within the atom. As a result, the atom becomes positively charged.
Hence,, when people use plastic combs on their hair, the combs become negatively charged. The situation which is true about this is the comb gains electrons and the hair loses electrons.
Two converging lenses are separated by 27.0 cm. The focal length of each lens is 8.90 cm. An object is placed 33.0 cm to the left of the lens that is on the left. Determine the final image distance relative to the lens on the right.
Answer:
1/i + 1/o = 1/f thin lens equation
i = 33 * 8.9 / (33 - 8.9) = 12.2 cm to right of first lens
27 - 12.2 = 14.8 cm to left of second lens
i = 14.8 * 8.9 / (14.8 - 8.9) = 22,3 cm to right of second lens
A car traveling at a constant speed of 30m/s passes traffic police on a motorcycle hidden behind a tree. Two seconds after the speeding car passes, the police set out to catch the car, accelerating at a constant rate of 6m/s2.
How far does the police travel until he catches the speeding car?
Give your answer in [m].
Answer:
411.37 meters
Explanation:
car position = 60 + 30 t
cop position = 1/2 a t^2 = 3 t^2 equate them
30t + 60 = 3t^2 re-arrange
3t^2 - 30t - 60 = 0 use quadratic formula to find t = 11.71 sec
1/2 (6)(11.71)^2 = 411.37 meters
Why does the book with more mass feel heavier in your hand
Answer:
because the book's is covered by papers
1 Explain the work being done at the New Mexico Institute of Mining and Technology and why it is significant.
The New Mexico Institute of Mining and Technology is significant because it proffer solutions to future challenges and problems.
What is the New Mexico Institute of Mining and Technology?The New Mexico Institute of Mining and Technology is also known as New Mexico Tech and it refers to a public university that is located in Socorro, New Mexico.
Basically, the New Mexico Institute of Mining and Technology is a public university which is devoted to excellence in education, innovation and research, so as to advance engineering, science, and technology.
In conclusion, the New Mexico Institute of Mining and Technology is significant because it proffer solutions to future challenges and problems.
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Three metal fishing weights, each with a mass of 1.00x102 g and at a temperature of 100.0°C, are placed in 1.00x102 g of water at 35.0°C. The final temperature of the mixture is 45.0°C. What is the specific heat of the metal in the weights?
Answer:
Approximately [tex]0.253\; {\rm J \cdot g^{-1} \cdot K^{-1}}[/tex] assuming no heat exchange between the mixture and the surroundings.
Explanation:
Consider an object of specific heat capacity [tex]c[/tex] and mass [tex]m[/tex]. Increasing the temperature of this object by [tex]\Delta T[/tex] would require [tex]Q = c\, m \, \Delta T[/tex].
Look up the specific heat of water: [tex]c(\text{water}) = 4.182\; {\rm J \cdot g^{-1} \cdot K^{-1}}[/tex].
It is given that the mass of the water in this mixture is [tex]m(\text{water}) = 1.00 \times 10^{2}\; {\rm g}[/tex].
Temperature change of the water: [tex]\Delta T(\text{water}) = (45 - 35)\; {\rm K} = 10\; {\rm K}[/tex].
Thus, the water in this mixture would have absorbed :
[tex]\begin{aligned}Q &= c\, m\, \Delta T \\ &= 4.182\; {\rm J \cdot g^{-1}\cdot K^{-1}} \\ &\quad \times 1.00 \times 10^{2}\; {\rm g} \times 10\; {\rm K} \\ &= 4.182 \times 10^{3}\; {\rm J}\end{aligned}[/tex].
Thus, the energy that water absorbed was: [tex]Q(\text{water}) = 4.182 \times 10^{3}\; {\rm J}[/tex].
Assuming that there was no heat exchange between the mixture and its surroundings. The energy that the water in this mixture absorbed, [tex]Q(\text{water})[/tex], would be the opposite of the energy that the metal in this mixture released.
Thus: [tex]Q(\text{metal}) = -Q(\text{water}) = -4.182 \times 10^{3}\; {\rm J}[/tex] (negative because the metal in this mixture released energy rather than absorbing energy.)
Mass of the metal in this mixture: [tex]m(\text{metal}) = 3 \times 1.00 \times 10^{2}\; {\rm g} = 3.00 \times 10^{2}\; {\rm g}[/tex].
Temperature change of the metal in this mixture: [tex]\Delta T(\text{metal}) = (100 - 45)\; {\rm K} = 55\; {\rm K}[/tex].
Rearrange the equation [tex]Q = c\, m \, \Delta T[/tex] to obtain an expression for the specific heat capacity: [tex]c = Q / (m\, \Delta T)[/tex]. The (average) specific heat capacity of the metal pieces in this mixture would be:
[tex]\begin{aligned}c &= \frac{Q}{m\, \Delta T} \\ &= \frac{-4.182 \times 10^{3}\; {\rm J}}{3.00 \times 10^{2}\; {\rm g} \times (-55\; {\rm K})} \\ &\approx 0.253\; {\rm J \cdot g^{-1} \cdot K^{-1}}\end{aligned}[/tex].
Calculate the final velocity of m1=2kg with its velocity at 5m/s
The final velocity of the two objects after the collision is determined as 4 m/s.
Final velocity of the two objects after the collisionThe final velocity of the two objects after the collision is determined from the principle of conservation of linear momentum as shown below;
m₁u₁ + m₂u₂ = v(m₁ + m₂)
where;
m1 = 2 kgu1 = 5 m/sm2 = 0.5 kgu2 = 0v = ?2(5) + 0.5(0) = v(2 + 0.5)
10 = 2.5v
v = 10/2.5
v = 4 m/s
The complete question is below:
A body of mass 2kg moving with velocity of 5m/s collides with a stationary body of mas 500g. if the two bodies move together after impact. Calculate the magnitude of their common velocity.
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Microwaves and gamma rays
- none of these.
- have the same wavelength.
- have the same color.
- have the same speed.
- have the same frequency.
Answer:
Have the same speed.
Explanation:
All electromagnetic waves travel at the same speed, which is 300,000,000 m/s.
A modern automobile engine creates various harmful gasses, but much of the emissions end up being harmless—especially once the car has been running for about five minutes on a temperate day. Attached to the exhaust pipe of a car is a device consisting of platinum and palladium coated onto a ceramic surface (beads or a honeycomb shape). What would you guess is going on here? Why might the device only work well after a car has been running for a while? Assess how you think factors such as temperature, concentration and the presence of a catalyst affect the rate of a chemical reaction in this scenario.
The factors influencing the rate of chemical reaction are concentration of the reactant,Surface area and physical condition of the reactants, Temperature, and catalyst.
What is a chemical reaction?One or more compounds, known as reactants, are transformed into one or more distinct substances, known as products. Such a process is known as a chemical reaction.
Following are the factors Influencing the rate of chemical reaction;
1. Concentration of the reactant.
The reaction is usually accelerated by increasing the concentration of one or more reactants. This occurs because a higher concentration of a reactant results in more collisions with that reactant in the same amount of time.
2. Surface area and physical condition of the reactants.
The pace of reaction is limited by the surface area of the in contact phases if reactant molecules reside in different phases, as in a heterogeneous mixture.
3. Temperature.
The rate of reaction is typically accelerated as the temperature rises. As the temperature rises, the average kinetic energy of the reactant molecules increases.
4. Catalyst
A catalyst is a substance that aids in the process without being ingested.
Catalysts provide a second reaction pathway for the production of goods. They play a crucial function in a variety of biological processes.
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What is the radius of the 5th orbital in hydrogen?
Answer:the radius of fifth Bohr orbital of hydrogen is 1.3225x10^-9
Explanation:
Let's see
According to bohrs model
[tex]\\ \rm\Rrightarrow r\propto n^2/Z^2[/tex]
[tex]\\ \rm\Rrightarrow r= r_on^2/Z^2[/tex]
[tex]\\ \rm\Rrightarrow r=0.529\times \dfrac{5^2}{1^2}[/tex]
[tex]\\ \rm\Rrightarrow r=0.529(25)[/tex]
[tex]\\ \rm\Rrightarrow r=1.32nm[/tex]
Two astronauts of mass 100 kg are 2 m apart in outer space. What is the
force of gravity between them? (G= 6.67 x 10-11 N·m2/kg?)
O A. 3.33 x 10-7N
O B. 1.67 x 10-7N
х
O C. 3.33 x 10°N
-
O D. 1.67 x 10°N
SUBMIT
Answer:
solution here
The correct anwer isB .
A ray of sunlight is passing from diamond into crown glass; the angle of incidence is 35.80°. The indices of refraction for the blue and red components of the ray are: blue (ndiamond = 2.444, ncrown glass = 1.531), and red (ndiamond = 2.410, ncrown glass = 1.520). Determine the angle between the refracted blue and red rays in the crown glass.
Answer:
N1 Sin θ1 = N2 Sin θ2 Snell's Law
For blue light
Sin θ2 = N1 / N2 sin 35.8 = 2.444 / 1.531 * .5850 = .9339
θ2 = 69.04 deg
For red light
Sin θ2 = 2.410 /1.520 * .5850 = .9275
θ2 = 68.05 deg
The separation is .01 deg
Assuming momentum was conserved, Jimmy and Kevin and their roller coaster car do not appear to slow down at all. How is it that the momentum was conserved when the bug collided with Jimmy, but there was no apparent change in speed?
Owing to the fact that the speed of the cars did not change, the momentum of the objects will not change.
What is momentum?Momentum refers to the product of mass and velocity. According to the laws of conservation of linear momentum, momentum is conserved before and after collsion.
Owing to the fact that the speed of the cars did not change, the momentum of the objects will not change after collsion even thpough momentum is conserved.
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