Answer:
uncle
Explanation:why not
The red and yellow car get into a collision. Before the collision, each car had a momentum of 5 kg.m/s. After the collision, the yellow car now has a momentum of 0. What is the momentum of the red car after the collision?
Answer:
10 kg-m/s
Explanation:
It is given that,
Before the collision, each car (red+yellow) had a momentum of 5 kg.m/s.
After the collision, the yellow car now has a momentum of 0.
We need to find the momentum of the red car after the collision. The conservation of momentum will be applied in this problem. A/c to this law,
Momentum before collision = Momentum after collision
[tex]p_r+p_y=p'_r+p'_y[/tex]
[tex]5+5=0+p'_r\\\\p'_r=10\ kg-m/s[/tex]
Hence, the momentum of the red car after the collision is 10 kg-m/s.
A 248 kg object moving at 19m/s comes to stop over a distance of 38 m. What is the coefficient of kinetic friction between the surfaces?
Answer:
μ = .4842
Explanation:
Assuming constant acceleration and the object is sliding on a level surface:
Let's start off by finding the acceleration of the object.
v₀ = 19 m/sv = 0 m/sΔx = 38 ma = ?v² = v₀² + 2aΔx
0² = 19² + 2a(38) 0 = 361 + 76a -361 = 76a a = -4.75 m/s²Now, we can make a free-body diagram and see that the only force opposing the object's motion is the friction force -- this is the only force in the x-direction.
We can use Newton's 2nd Law: F = ma to solve for the coefficient of friction.
F = ma
F = friction force = μ * N = μ * mgNow, we have:
μ * mg = maThe mass cancels out and solving for the coefficient of friction gives us:
μ * g = a μ = a/gWe know the acceleration is -4.75 m/s² and g = -9.81 m/s²:
μ = -4.75/-9.81 μ = .4842The coefficient of kinetic friction between the surfaces, assuming constant acceleration and a flat surface, is 0.4842.
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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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]
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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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
What do all types of electromagnetic radiation have in common? choose more than one answer.
short wavelength
stream of photons
energy in atoms
only from radioactive material
speed of 300,000 kilometers per second
travel through vacuum of space
Answer:
Explanation:
Let's go through each one.
short-wavelength - not all of them got short wavelengths.
stream of photons - yup, they all got a stream of photons, but the longer wavelengths' photons don't carry much energy such as the shorter wavelengths.
energy in atoms - yes, all wavelengths have energy, the short wavelengths carry more energy than the longer ones.
only from radioactive material - not at all. Radio waves and microwaves are not radioactive! only the wavelengths that carry a large amount of energy are radioactive - these are the shorter wavelengths - these might be gamma rays and x-rays.
speed of 300,000 kilometers per second - yes! all electromagnetic radiation travels at this speed! isn't it amazing?
travel through vacuum of space - yup, all of them.
Hope this helps!
The WHITE numbers painted on the left side of the table will inform us of...
A. the number of valence electrons
B. the number of energy levels around the nucleus
C. the number of protons in the nucleus
D. the number of neutrons in the nucleus
Answer:
a,this help to know the
period in which an element belong to,which also talks about the oxidation number or state of this uncombined element
Describe some tests that could be done to determine what an unknown substance is.
Answer:
by finding melting and boiling points
Explanation:
Answer:
Simple chemical tests can be used to identify the presence of various elements or classes of molecules (Tollen's test). ... Electron spin resonance (ESR): Also referred to as electron paramagnetic resonance (EPR), this method uses the spins of unpaired electrons in molecules to determine structure
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
What keeps all of the planets in the solar system from leaving their orbits around the sun?.
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.
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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A student is gliding along on a scooter at a comfortable 2.8 m/s when Mr. Jones walks around the corner and the two collide. If the student is brought to rest in 0.15 s, what is their acceleration (hint: should it be acceleration or deceleration)?
Answer:
Their deceleration is - 19 [tex]\frac{m}{s^{2} }[/tex]
Explanation:
Acceleration is a quantity that indicates how the speed of the object changes over time. In other words, acceleration is a vector quantity that relates changes in velocity to the time it takes to occur. It is normally represented by the letter a and its unit of measurement, in the International System it is meters per second squared [tex]\frac{m}{s^{2} }[/tex].
The mathematical expression for the acceleration is:
[tex]a=\frac{final speed - initial speed}{final instant - initial instant}[/tex]
In this case:
final speed= 0 [tex]\frac{m}{s}[/tex]initial speed= 2.8 [tex]\frac{m}{s}[/tex]final instant=0.15 sinitial instant= 0 sReplacing:
[tex]a=\frac{0 \frac{m}{s} - 2.8\frac{m}{s} }{0.15 s - 0s}[/tex]
a= -18. 667 [tex]\frac{m}{s^{2} }[/tex] ≅ -19 [tex]\frac{m}{s^{2} }[/tex]
Deceleration is a quantity that expresses the passage of a moving body from one speed to a lower speed. Mathematically it is calculated as the acceleration but the result will be a negative acceleration.
Their deceleration is - 19 [tex]\frac{m}{s^{2} }[/tex]
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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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
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.
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:
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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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
A cruise ship has a mass of 100,000,000 kg and a kinetic energy of 5,000,000 kJ. Calculate the speed of the cruise ship.
Explanation:
K.E = 5,000,000 KJ
MASS = 100,000,000 Kg
K.E = 1/2 MV^2
[tex]5000000 = \frac{1}{2} \times 100000000 \times v {}^{2} [/tex]
[tex]5000000 = 50000000 \times v {}^{2} [/tex]
[tex]v {}^{2} = \frac{5000000}{50000000} [/tex]
[tex]v {}^{2} = \frac{5}{50} [/tex]
therefore
[tex]v {}^{2} = \frac{1}{10} [/tex]
[tex]v = \sqrt{0.1} [/tex]
v = 0.316 m/s^2
The velocity of the cruise ship whose mass is 10⁸ Kg moving with Kinetic energy of 5 x 10⁹J is 10 m/s
What is Kinetic Energy?The Kinetic energy of the body is the energy possessed by body by virtue of its motion.
Given is a cruise ship that has a mass of 100,000,000 kg and has a kinetic energy of 5,000,000 kJ. From this, we can write -
Mass [M] = 10⁸ Kg
Energy [E] = 5 x 10⁶ KJ = 5 x 10⁹ J
The formula to calculate the Kinetic energy of the body is -
E [K] = E = 1/2 mv²
v² = 2E/m
v² = (2 x 5 x 10⁹)/10⁸
v² = 100
v = √100
v = 10 m/s
Therefore, the velocity of the cruise ship whose mass is 10⁸ Kg moving with Kinetic energy of 5 x 10⁹J is 10 m/s
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Free Brainliest
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:
I hope this helps!
Kamaria is learning how to ice skate. She wants her mother to pull her along so that
she has an acceleration of 0.80 m/s2. If Kamaria's mass is 27.2 kg, with what force does
her mother need to pull her? (Neglect any resistance between the ice and Kamaria's
skates.)
“Physics”
Answer:
21.76J
Explanation:
F=ma
where:
m=mass
a=acceleration
Kamaria's mother should pull her with a force of 21.76 Newton if she (Kamaria) wants her acceleration to be 0.80 m/s².
What is Force?
In order to accelerate a body of mass 'm kg' with an acceleration of 'a m/s²', a force of magnitude equal to the product of mass and required acceleration is required. Mathematically -
F = m x a
Given is a girl learning how to ice skate. She wants to move with an acceleration of 0.80 m/s² and her mass is 27.2 kg.
From the definition of force, we can write -
F = m x a
F = 27.2 x 0.8
F = 21.76 Newton
Therefore, Kamaria's mother should pull her with a force of 21.76 Newton if she (Kamaria) wants her acceleration to be 0.80 m/s²
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What is a scientific theory?
1. a testable guess that predicts how variables are related in an experiment or model system, often expressed as an if-then statement
2. an explanation of that natural world that has been repeatedly confirmed through observation and experimentation and is accepted by the scientific community
3. the description of the relationships between observable phenomena
4. a guess or prediction about the natural world with no evidence that some people believe and some people do not believe
WHOEVER ANSWERS CORRECTLY AND FIRST WILL GET BRAINLIEST
Answer:
2. an explanation of that natural world that has been repeatedly confirmed through observation and experimentation and is accepted by the scientific community.
what are the most elements on the periodic table
Answer: metals
Explanation:
An 11-year-old girl’s height increased by several inches in three months. Which example of the characteristics of life is most similar?
A)An octopus camouflages with the ocean floor.
B)A giraffe eats leaves off a tree.
C)A bee stings a person who is swatting it away.
D)A kitten gains weight.
E)A butterfly moves pollen from one flower to another.
Answer:
D: A kitten gains weight.
Explanation:
give answer in decimal to the nearest tenth of a cm
A wave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz. what wavelength is produced? 0.67 m 0.75 m 1.5 m 3.0 m
Explanation:
velocity = frequency × wave length
33 = 22 × wave length
wave length = 33 ÷ 22 = 1.5 m
this is the correct answer Step-by-step
I hope you understand...
can you please mark my answer
Answer:
C
Explanation:
EDGE22
How would you obtain a mean value for the specific heat
capacity of a material?
If you pull back on a rubber band with a rock in it and then let go, which is this an example of.
Answer:
elastic potential energy
Explanation:
The situation above shows an example of an "elastic potential energy." This type of potential energy depends on the force being applied to the elastic object.
In the situation above, the elastic object is the rubber band. The resultant energy is then being stored until such time that this object will be freed. Once this happens, the elastic object will revert to its original form and the rock will soar (be released).
The amount of energy that is being stored largely depends on the distance of the "stretch" being applied to the object. It is said that the greater the force, the greater the stretch and the greater the distance covered by the rock (and vice-versa).