Answer:
Momentum is defined as the amount of motion occurring in something that is moving, or the force that drives something forward to keep it moving. An example of momentum is how quickly a car is moving down a hill.
if Gabriel kicks the football 50 meters to the west in 3 seconds , what is the velocity of the football?
Answer:
velocity = 16.67[m/s]
Explanation:
To solve this problem we must use the following expression of speed, where we see the relationship between displacement and time.
velocity = displacement/time [m/s]
displacement = 50 [m]
time = 3 [s]
velocity = 50/3
velocity = 16.67[m/s]
why was the triple beam balance invented
Answer:
The triple beam balance is an instrument used to measure mass very precisely. Such devices typically have a reading error of ±0.05 grams. ... The triple beam balance can be used to measure mass directly from the objects, find mass by difference for liquid, and measure out substances.
Why are some environmental problems only solved through joint efforts on an international scale?
Answer:
International Environmental Problems require international Cooperation to resolve them Factors Responsible for the Emergence of the Environment as a Global Issue 1. The Multiplication and Deepening of Environmental Problems.
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In which scenario is an animal doing work? Check all that apply. A cat lifts up her kitten by its neck. A dog rubs his back against a large tree. A bird flies a worm from the ground to its nest in a tree. A goat butts its head against the barn wall. A horse pulls a wagon along a road.
Option 1,3 and 5 are correct. Work is defined as the product of applied force and the distance through which the body is displaced on which the force is applied.
What is work?Work is defined as the product of applied force and the distance through which the body is displaced on which the force is applied.
Work may be zero, positive or negative.it depends on the direction of the body displaced. if the body is displaced in the same direction of the force it will be positive .
while if the displacement is in the opposite direction of force applied the work will be negative work. if there is no displacement of the body the work done will be zero.
The following options are correct because the work is due to displacement. In all three options, the displacement is done. The correct options are;
A cat lifts up her kitten by its neck.
A bird flies a worm from the ground to its nest in a tree.
A horse pulls a wagon along a road.
Hence options 1,3 and 5 are correct.
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Answer:
its 1, 3, and 5
Explanation:
or a, c, and e
A hot air balloon hovers at 92.4 m above the ground. The pilot drops a box over the edge of the basket. How fast does the person standing 10 m away, have to go to catch the box, before it hits the ground?
Answer:
In order to catch the box before it hits the ground, the person needs to go as fast as approximately 5.96 m/s
Explanation:
The height of the hot air balloon above the ground, s = 92.4 m
The location on the ground of the person intending to catch the box, x = 10 m away horizontally from the base location of the balloon
The time it takes the balloon released at zero vertical velocity is given by the following equation;
s = 1/2·g·t²
92.4 = 1/2 × 9.8 × t² = 19.6·t²
t² = 92.4/19.6 ≈ 4.714
t = √4.714 ≈ 1.68 seconds
The time, t, it takes the box to hit the ground ≈ 1.68 seconds
The speed, v, of the person standing 10 m away has to go to catch the box before it hits the ground is v = Distance/time =10/1.68 ≈ 5.96 m/s
In order to catch the box before it hits the ground, the person needs to go as fast as approximately 5.96 m/s.
Which of the following describe an electric motor?
Answer:
B. Changes electrical energy to mechanical energy.
Explanation:
We must make it clear that all the answers are correct, but yet answer B condenses the essence of the main objective of an electric motor. Electrical energy is converted into rotary motion of an axis, that rotational motion is considered a mechanical motion.
a 9-volt battery is attached to a series circuit consisting of a 10-ohm resistor and 1-farad capacitor and a switch. when the switch closes the circuit, describe the original and final current through the ciricuit.
The initial and final current are both zero because direct current does not pass thru a capacitor:
Current thru a capacitor is described as:
i = -E/R e^-t / RC
When switch is first closed t = -0 and i - E/R = -9/10 = -.9 amps
Perhaps this is what was meant by "first closed"
As t goes to infinity i, in the circuit goes to zero
Answer:
correct answer is C on usatestprep
Explanation:
Explain what bias means when it comes to a scientific experiment.
Answer:
bias refers to effects that a conclusion that may be incorrect, as for example when a researcher patient knows what treatment is being given, to avoid bias a blinded study may be done
which of the following options best describes a solid object
Answer:
Which of the following correctly describes a solid? Explanation: A solid is defined as having a definite shape and definite volume. A liquid is defined as having a definite volume, but not a definite shape.
What 2-3 options would you outline for Alana to help her achieve her goals? Be ready to discuss with her the pros/cons of working more versus finding other ways to adjust her budget. Be specific with your recommendations, highlighting specific costs or income sources.
3 options to help Alana achieve her goals include;
Make a list before shopping.Separate money for expenses from money that is to be saved.Reduce money spent on entertainment.For Alana to save a considerable amount of her money, she must be willing to draw a priority list where important expenses come first. Expenses that are not so important can come later.
When she receives her salary, the money for expenses should be immediately separated from the savings. Alana's note shows that she spends a lot on entertainment. $40 on coffee, $36 on movies, $48 on meals with friends, 3 trips to the mall are way too much on entertainment. Alana should reduce the expenditures on pleasures.
If Alana decides to work more, she might break down in her physical health but if she decides to adjust her budget, then she saves her energy and invests more time in her studies.
Summarily, for Alana to achieve her goals, she should make a list, separate money for expenses, and cut down on entertainment.
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A sports car accelerates at a constant rate from rest to a speed of 27.8 m/s in 8.00 s. What is the distance of
the sports car in this time interval?
Answer:
The answer is 222.4 mExplanation:
The distance covered by an object given it's velocity and time taken can be found by using the formula
distance = velocity × timeFrom the question
velocity = 27.8 m/s
time = 8 s
We have
distance = 27.8 × 8
We have the final answer as
222.4 mHope this helps you
1. A car starts from rest and accelerates at a constant rate of 2.5 m/s2. What is the
car's velocity after the car has traveled 100 m?
Explanation:
u (initial velocity) = 0
acceleration = 2.5 m/s²
s (distance) = 100 m
Then,
v² = u² + 2as
v² = (0)² + 2×2.5×100
v² = 0 + 500
v² = 500
v = √500
v = 10√5 m/s
When a car starts from rest and accelerates at a constant rate of 2.5 m/s2 then the car's velocity after the car has traveled 100 m would be 15.81 m/s.
What is acceleration?The rate of change of the velocity with respect to time is known as the acceleration of the object.
As given in the problem a car starts from rest and accelerates at a constant rate of 2.5 m/s2 then we have to find the car's velocity after the car has traveled 100 m.
By using the third equation of motion
v² - u² = 2×a×s
By substituting the respective values in the equation, as given the car cover a distance of 100 m
v² - u² = 2×a×s
v²-0² =2× 2.5×50
v²=250
v = 15.81 m/s
Thus, the car's velocity would be 15.81 m/s.
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1. If you move a magnet through a solenoid, an _______
is induced.
Answer:
electromotive force (emf)
Explanation:
How many electrons does sodium have?
O 23
O 12
O 13
O 11
Answer:
11
Explanation:
its 11 because protons and electrons have the same answer
Answer:
11
Explanation:
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what are the most elements on the periodic table
Answer: metals
Explanation:
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If light travels at 3.00 x10^8 m/s, how long will it take light from the sun to reach a planet that is 6.45 light years away? How far will the light have traveled in meters? (Light year- distance travelled by light in one year. Use a value of exactly 365 days for a year.)
Answer:
distance = 6.1022 x10^16[m]
Explanation:
To solve this problem we must use the formula of the average speed which relates distance to time, so we have
v = distance / time
where:
v = velocity = 3 x 10^8 [m/s]
distance = x [meters]
time = 6.45 [light years]
Now we have to convert from light-years to seconds in order to get the distance in meters.
[tex]t = 6.45 [light-years]*365[\frac{days}{1light-year}]*24[\frac{hr}{1day}] *60[\frac{min}{1hr}]*60[\frac{seg}{1min} ] =203407200 [s][/tex]
Now using the formula:
distance = v * time
distance = (3*10^8)*203407200
distance = 6.1022 x10^16[m]
What shape do we call the moon when we can only see a small slither or less than a 1/4 of the moon?.
Answer:
waxing crescent
Explanation:
waxing crescent
Explanation) A waxing crescent is the beginning of the lunar cycle. It is waxing because the right hand side is illuminated and it's growing. It is a crescent shape from a small sliver until it's just less than the 1st quarter.
What is the efficiency of a device that takes in 600 J of thermal energy and does 300 J of work? Use . (1 point)
Explanation:
e = ?
work output = 300 J
work input = 600 J
[tex]efficiency \: = \frac{work \: output}{work \: input} \times 100[/tex]
we multiply by 100 in order to get your efficiency in percentage
[tex]e = \frac{300}{600} \times 100[/tex]
[tex]e = \frac{1}{2} \times 100[/tex]
[tex]e = 50\%[/tex]
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How would you obtain a mean value for the specific heat
capacity of a material?
The two angled ropes are used to support the crate in the picture. The sum of the tension in the ropes can have any value up to 1500 N. When the tension in the ropes exceeds 1500 N the rope will break. What is the largest mass the ropes can support?
Answer:
The largest mass is 170.7 Kg.
Explanation:
Given that,
Tension = 1500 N
We need to calculate the tension in the rope
Using balance equation
[tex]T_{1}\cos\theta=T_{2}\cos\theta[/tex]
Put the value into the formula
[tex]T_{1}\cos30=T_{2}\cos45[/tex]
[tex]T_{1}\dfrac{\sqrt{3}}{2}=\dfrac{T_{2}}{\sqrt{2}}[/tex]
[tex]T_{1}=\dfrac{\sqrt{2}}{\sqrt{3}}\times T_{2}[/tex]
If [tex]T_{2}=1500\ N[/tex]
[tex]T_{1}=\dfrac{\sqrt{2}}{\sqrt{3}}\times1500[/tex]
[tex]T_{1}=1224.74\ N[/tex]
We need to calculate the largest mass
Using balance equation
[tex]mg=T_{1}\sin30+T_{2}\sin45[/tex]
[tex]mg=1224.74\times\dfrac{1}{2}+1500\times\dfrac{1}{\sqrt{2}}[/tex]
[tex]mg=1673.03\ N[/tex]
[tex]m=\dfrac{1673.03}{9.8}[/tex]
[tex]m=170.7\ Kg[/tex]
Hence, The largest mass is 170.7 Kg.
A 4kg ball that is moving straight upward has 20J of kinetic energy and its total mechanical energy is 32J. Find the gravitational potential energy of the ball
Answer:
h = 0.25 [m]v = 3.26 [m/s]
Explanation: In order to solve this problem, we must remember that mechanical energy is defined as the sum of kinetic energy plus potential energy.
How do glaciers affect sea level?
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How can we find the wavelength of a wave?
Well, it depends on the subject matter:
Physics
[tex]\displaystyle \frac{v}{f} = \lambda[/tex]
The Grecian lettre, known as lambda [tex]\displaystyle [\lambda],[/tex]symbolises the wavelength, and is determined by the division of the frequency [tex]\displaystyle [expressed\:in\:Hz][/tex]and wave velocity [tex]\displaystyle [expressed\:in\:km/s, m/s, km/h, mi/h, etcetera].[/tex]The majourity of calculations are strictly perfourmed in metric units. If the frequency is in kilohertz [tex]\displaystyle [kHz][/tex]or the wave velocity is in kilometres per hour [tex]\displaystyle [km/h],[/tex]you must convert these quantities to Hertz and metres per second [tex]\displaystyle [m/s][/tex]by multiplying by 1000 [tex]\displaystyle [10\:kHz = 10000\:Hz].[/tex]
Mathematics [Calculus (Real-Word situations)]
[tex]\displaystyle F^{-1} = T[/tex]
Now, a prime example of a real-world situation is a Ferris Wheel. At any point you are told to write a cosine and\or sine equation, and you are given the frequency of a wave, [tex]\displaystyle F,[/tex]double it and set [tex]\displaystyle \pi[/tex]up against it because remember, in Physics, the formula for finding the wavelength in lengths of time is written above.
*If you need examples on this, check my past responces to real-world situations to regain that ideya of how to find the wavelength of trigonometric equations.
I am joyous to assist you at any time.
When a plastic spoon is rubbed on a woollen cloth and held above a mixture of salt and pepper, pepper jumps to the spoon. Choose the best reason for this: a) Air pushes the pepper towards the spoon. b) The spoon temporarily gets magnetised. c) The spoon temporarily gets charged with static electricity. d) Gravitational attraction pulls the pepper to the spoon.
Answer:
c) The spoon temporarily gets charged with static electricity.
Explanation:
Static electricity is the electric charge that arises on the material's surface. This is caused when the two positive and the negative charges come in contact with each other. The electricity generated finds an escape from the object's surface.
Rubbing the spoon makes it negatively charged while the sat and pepper have positive charge.
Between salt and pepper, it is the pepper that jumps to the spoon because it is lighter than salt.
What forces cause the magnetic repulsion and attraction?
Answer:
The cause of a magnetic force are small electrical currents or moving charges: Tiny circular currents at the atomic level are responsible in a permanent magnet for it to exert a magnetic force.
Explanation:
The section supports an upward internal shear force and a clockwise internal torque. Where does the absolute maximum shear stress occur?.
The absolute maximum shear stress will occur at : Point A
What is Shear stress ?Shear stress is a force that cause deformation of a material via slippage along planes which are parallel to each other.
From the diagram the shear stress distribution is parabolic in nature therefore the absolute maximum shear stress will occur at points A and C of the diagram.
The shear stress appears maximum at point A due to the shear force and torque
Hence we can conclude that the absolute maximum shear stress will occur at Point A
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Attached below is the missing image related to your question
An object has a weight of 755 Newtons. Determine what the mass of this
object is. Weight (N) = mass (kg) xg (9.8 m/s/s) *
=
0 7400 kg
O 77 kg
O 765 kg
04530 kg
O 75,5 kg
Answer:
75.5 kg
Explanation:
w=mg
755= m × 10
m = 75.5
How are suspensions, solutions, and colloids related?
Answer:
A solution is always transparent, light passes through with no scattering from solute particles which are molecule in size. ... A colloid is intermediate between a solution and a suspension. While a suspension will separate out a colloid will not. Colloids can be distinguished from solutions using the Tyndall effect.
Explanation:
When a suspension is allowed to stand, the particles separate. A colloid is a substance that exists between a solution and a suspension. A colloid will not separate from a suspension. The Tyndall effect can be used to distinguish colloids from solutions.
What is suspension?In chemistry, a suspension is a heterogeneous mixture of a fluid containing solid particles large enough to settle.
A suspension is a complex blend in which the solute particles do not disintegrate but rather become suspended throughout the bulk of the solvent and float freely in the medium.
A solution is a uniform mixture of one or more dissolved solutes in a solvent.
A solvent is a substance that dissolves a solute to produce a homogeneous mixture. The substance that dissolves in a solvent to form a homogeneous mixture is referred to as a solute.
A colloid is a mixture in which one substance is suspended throughout another, consisting of microscopically dispersed insoluble particles.
Larger particles in a suspension settle out, block or scatter light, and can be filtered out.
A colloid contains particles that are between the sizes of a solution and a colloid; they are not heavy enough to settle or be filtered out, but they still scatter light.
Thus, this way these three are related.
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Answer:
When a car stops suddenly, we fall forwards. This is because the upper part of our body tends to continue to be in motion due to inertia. Newton's first law of motion, sometimes referred to as the law of inertia, states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. When the car stops slowly, its force is lesser than when the car stops harshly. This act of unbalanced force makes the mangoes fly forward.
Explanation:
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This object has a mass of 45 kilograms. The applied force is 300 N and the force of friction is 120 N. What is the acceleration of this object
Answer:
4ms^-2
Explanation:
m = 45Kg, Frictional force = 120N, Applied force = 300N, a = ?
Firstly, you find the net force acting on the body
Net force = Applied force - Frictional force
Net force = 300N - 120N = 180N
F = 180N
using the formula for Force
F = ma
Then making acceleration subject of the formula; you will get:
a = F/m
a = 180N/45Kg
a = 4ms^-2