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 20 kg block slides across a horizontal surface if the coefficient of kinetic friction between the block and the surface is 0.20, what is the force of kinetic friction that acts on the block
Answer:
I got:
u
s
=
0.51
F
=
78.4
N
Explanation:
At the start the
100
N
force is just enough to overcome static friction so we can write:
Force
=
Static Friction
F
=
μ
s
N
where
μ
s
is the coefficient of static friction and
N
=
Normal Reaction that in an horizontal case such this will be equal to the weight of the block, so
N
=
m
g
.
We get:
F
=
μ
s
⋅
m
g
in numbers:
100
=
μ
s
⋅
20
⋅
9.8
μ
s
=
100
20
⋅
9.8
=
0.51
Which of the following is an example of an electric force acting at a distance?
A.
Pam rubs a glass rod with wool, then moves the rod over a pile of small paper scraps. The scraps leap into the air and stick to the rod.
B.
Pam applies a force to the head of a nail by pounding it with a heavy, iron hammer. The nail then wedges itself between the fibers of a wooden board.
C.
Pam applies a twisting force to the steering wheel of her car. This force pushes on tubes filled with fluid, which then push the wheels of her car to one side.
D.
Pam jumps out of an airplane. Air rushes past her body at
a very high speed as she falls. She then opens her parachute and feels an upward force.
Answer:
Option A
Explanation:
An electric force is a charged reaction that causes an attraction or a repulsion between two charged objects. In this case rubbing a glass rod with wool charges up the rod which then turns it into magnetic, which attracts the paper scraps from the ground to the rod where it sticks. The best answer is option A or "Pam rubs a glass rod with wool, then moves the rod over a pile of small paper scraps. The scraps leap into the air and stick to the rod."
Hope this helps.
4. A girl places a stick at an angle of 60.0° against a flat rock on a frozen pond. She pushes at an angle and moves the rock horizontally for 2.00 m across the pond at a velocity of 4.00 m/s and a power of 160.0 W. What force did she apply to the stick? How much work did she do? Your response should include all of your work and a free-body diagram
Answer:
Below!
Explanation:
Why does fitness matter?
Answer:
The great thing about exercise is that it’s never too soon or too late to start. Fitness can support healthy growth and development in children and reduce the risk of cognitive decline and delay the onset of dementia in older people. You don’t have to join a gym or spend lots of money on equipment to get fit.
Explanation:
When a car suddenly stops at a red light, a book lying on the car seat slides forward. Why does the book continue to move forward?
A. The book loses its backward momentum
B. The car moves in reverse more rapidly than the book
C. The friction of braking transfers energy to the book
D. The book’s inertia causes it to continue
Answer:
i think the answer is c if you get it wrong then it is b
Explanation:
Answer:
Your answer is: D) The book's inertia causes it to continue
Explanation:
Hope this helped : )
The Sankey diagrams below show the
energy transfers in two light bulbs. The
useful energy output for these light
bulbs is carried to the energy stores of
the environment by
What
is the missing word?
1
8ØJ
Input energy
4ØJ
Useful energy
2
8ØJ
Input energy
1ØJ
Useful energy
The useful energy output for these light bulbs is carried to the energy stores of the environment by light waves.
Useful energy
The useful energy from the two light bulbs is the energy that is beneficial and consumed. This energy is said to be used to do meaningful work.
The useful energy from the two light bulbs illuminates the environment and enables us to see in the dark.
What is Light wave?A light wave is a type of electromagnetic wave that carries light energy. This light wave carries visible light into the environment.
The light from the two lights bulbs are visible lights and thus, the useful energy output for these light bulbs is carried to the energy stores of the environment by light waves.
Learn more about light waves here: https://brainly.com/question/1363382
Compound microscopes focus light through ______ to produce a magnified image.
Which statement compares how secondary earthquake waves and soundwaves move? A.Both can move through liquids. B.Neither can move through liquids. C.Secondary earthquake waves can move through liquids, but sound waves cannot. D.Sound waves can move through liquids, but secondary earthquake waves cannot.
Answer:
D
Explanation:
Secondary earthquake waves is a seismic wave that can travel through solid but cannot travel through liquid and gas.
This wave is one of the fastest traveling seismic waves.
While sound wave can travel through both solid and liquid and even gas.
Therefore, the statement that compares how secondary earthquake waves and soundwaves move is:
Sound waves can move through liquids, but secondary earthquake waves cannot.
The best answer is therefore D
Quarterback backpedals 2.5 M northward and then runs 6.8 M Southward what is the magnitude and direction of the displacement
Answer:
4.3
Explanation:
because 6.8 subtracted by 2.5 is 4.3
A graph of KE vs the mass of an object is __.
A graph of KE (kinetic energy) vs the mass of an object is a line, as we know that the kinetic energy depends linearly on the mass of the object.
What is kinetic energy?For an object of mass M moving with velocity v, we define its kinetic energy as:
KE = (M/2)*v^2
We can rewrite it as:
KE = (v^2/2)*M
So, it is a "coefficient" (if we assume that the velocity is constant) times the mass. That gives a linear relationship.
Then we conclude that the kinetic energy depends linearly on the mass, which means that the graph of KE vs the mass of an object is a line.
If you want to learn more about kinetic energy, you can read:
https://brainly.com/question/8101588
Calculate the momentum of a 0. 145 kg baseball being thrown at a speed of 40. 0 m/s
Usain Bolt ran the 100m dash in 9.69 seconds. How fast does he run in the 100m dash?
Which force controls the size of an atomic nucleus?
1electromagnetic force
2weak nuclear force
3strong nuclear force
4gravitational force
Answer:
Strong nuclear force
Explanation:
When connected to a battery, a lightbulb glows brightly. If the battery is reversed and reconnected to the bulb, the bulb will glow:.
Explanation:
When a battery is connected to a lightbulb properly, current flows through the lightbulb and makes it glow.
What includes the distance and time at a specific moment?
Answer:
s = ut + 1/2 att (that's "t" squared), where
s = distance travelled - in metres
u = initial velocity - in meres per second
a = acceleration - in metres per second squared, i.e. metres per second increase in acceleration, per second
t = time taken - in seconds
Explanation:
Time, "t", at a specific moment is a resolved variable, i.e. we know the value, so the equation needs to show distance "s" at that specific time "t". The basic equation is for fixed initial position (when t = 0) , where distance ,"s", = "0", fixed initial velocity, "u", ( at t = 0, s = 0 ) - which can be zero or a value, and fixed (constant) acceleration, "a", ( from t = 0, s = 0, through to t = "specific moment", s = "the answer" ) - which can be zero or a value.
2. Can you rearrange the equation F = kx to get k on one side of the equation
(on its own!). Now, can you rearrange it to get x on its own?
k = f/x
x = f/k
( / means divide )
The equation connecting force and the displacement k is F= k x. From the spring constant k can be found by dividing F by x and similar to get x by dividing F by k.
What is force?Force is an external agent acting on a body to change it from the state of motion or rest. There are various kinds of force namely magnetic force, frictional force, gravitational force etc.
Force applied on a body if result in displacement of the body it is said to work done on the body. An elastic body like a spring can be stretched or compressed by applying a force on it. Let the change in length or displacement of the elastic body be x.
Then, the force applied on it to make the displacement x is directly proportional to x.
F = k x, where k is the proportionality constant here called the spring constant.
From this the spring constant k = F/x
Similarly, if we know the force f and spring constant k, then x = F/k.
To find more on spring constant, refer here:
https://brainly.com/question/14973217
#SPJ2
A water wave has a frequency of 8 hertz and
a wavelength of 4 meters. What is its speed?
Answer:
6 is the speed.
Explanation:
Answer:
32 m/s
Explanation:
the formula to find speed is to either multiply the wavelength by the frequency or divide the wavelength by the period. Thus the frequency of 8 times the wavelength of 4 would be 32 meters per second.
how is geothermal energy trapped? state a draw back of this kind of energy.
Answer:
Geothermal energy can be trapped using geothermal plants that utilizes steam escaping from the earth surface to make electricity.
The limitations include :
depletion of the geothermal sourcehigh costs of investments required for geothermal systemsExplanation:
Geothermal energy originates in form of heat/steam escaping from the inner parts of the earth surface. The steam trapped is converted to electricity through turbines. The hot water pumped by heat pumps can be used to heat homes or for heating purposes in industries.
The limitations of geothermal energy are high initial capital costs for installing the systems, depletion of geothermal sites after sometime, environmental concerns due to greenhouse gases emissions and land requirements for geothermal projects.
An airplane is traveling 200 mph south. You get up and walk down the aisle at 1 mph north. Your resultant velocity is
Find magnitude of vector sum
Answer:
An airplane is flying at an airspeed of 200 miles per hour headed on a SE bearing of 140°. A north wind (from north to south) is blowing at 16.2 miles per hour, as shown in Figure 8.8.1. What are the ground speed and actual bearing of the plane?
Explanation:
plss brainlieist me
θ = 205° - 105° = 100°
[tex]\tt R=\sqrt{L^2+M^2+2LMcos\theta}\\\\R=\sqrt{303^2+555^2+2.303.555cos100}\\\\R=584.32~m[/tex]
What is the difference between intrusive and extrusive rocks.
Answer:
Extrusive rocks form on the Earth's surface from lava, which is magma that has risen from underground. Intrusive rocks are formed when magma cools and solidifies within the planet's crust.
That's the difference
If Sam pushes a table with a force of 15 N and it moves a distance of 2 m, how much work did Sam do on the table?
30 J
7.5 J
13 J
17 J
The computation of the work done is gotten by multiplying the force and distance whish will be A. 30J.
How to calculate work done?It should be noted that the formula for calculating work done is given as:
Work = Force × Distance
where,
Force = 15N
Distance = 2m
Therefore, work done will be:
= Force × Distance
= 15N × 2m
= 30 Joules.
In conclusion, the work done is 30 Joules.
Learn more about work done on:
https://brainly.com/question/25573309
Hydrogen is found as a gas on Earth but exists in all four states in the solar
system. Four samples of hydrogen have equal masses but are each in a
different state. Which statement about the relative amounts of thermal
energy in the samples is true?
Answer:the sample of solid has less energy than the sample of gas
Explanation:
Apex
A coffee machine transfers 12 kj of energy in 15 seconds. It uses 230 v mains supply. Use this information to work out the current through the coffee machine
The current through the coffee machine is 3.48 A.
To calculate the current flowing through the coffee machine, we use the formula below.
Formula:
E = VIt............. Equation 1Where:
E = Energy transfered by the machineV = Voltage of the main supplyI = current through the coffee,t = time.
Make I the subject of the equation.
I = E/Vt.............. Equation 2From the question,
Given:
E = 12 kJ = 12000 JV = 230 Vt = 15 seconds.Substitute these values into equation 2
I = (12000)/(230×15)I = 3.48 A.Hence, The current through the coffee machine is 3.48 A.
Learn more about current here: https://brainly.com/question/14883923
Answer:3.48
Explanation:
Nikola Tesla and Thomas Edison were both pioneers when it came providing electricity to the people. Edison had hired the genius Tesla to work for him, but their differences, pride and personalities caused them to compete and publicly insult one another instead of working together. List 5 strategies these two could have used to help them work with others they disagree with.
Explanation:
In other to avoid a situation where their differences, pride, and personalities caused them to compete and publicly insult one another instead of working together they need to respectfully consider the viewpoints of each other, as well as assign individual roles that should be respected.
unit measure for time
Two projectiles are fired at equal speeds but different angles. One is fired at angle of 30 degrees and the other at 60 degrees. The projectile to hit the ground first will be the one fired at (neglect air resistance) ____.
Answer:
14 degrees
Explanation:
because you can divide all and find the angle to find the answer
hope it's help ty make me brainless pls
Please help!!! I’ll
mark brainliest!
Answer:
D, the weight
Explanation:
Normal force is mass times gravity
gravity help determines weight
Also a,b and c are all vectors and D is a scaler
Which planet moves the fastest and which planet moves slowest?
What kind of combination of mass, fan speed, and surface is best for taking
the most mass across the 500 cm of track, but keeping it under 80 cm/sec,
which is a standard for safety in this cart type.
Answer:bro I need someone to help me with this question too what did you awser
Explanation: