Answer:
31.3 km/h
Explanation:
momentum before collison = momentum after collion
m1xv1 = m2xv2
25x 1500 = 1200 x v2
v2=32.25 km/h = 32.3 km/h (3 sf)
The lighter car is moving at 6.25 km/h South after the collision.
What is law of conservation of momentum?The law of conservation of momentum asserts that, unless an external force is applied, the total momentum of two or more bodies operating upon one another in an isolated system remains constant. As a result, momentum cannot be gained or lost.
Newton's third law of motion has a direct impact on the idea of momentum conservation.
From law of conservation of momentum; we can write:
Total initial momentum = total final momentum
1500 kg × 100 km/h + 1200×(-100 km/h) = 1500 kg × 25.0km/h + 1200×(v km/h)
100×300 kg-km/h = 1500×25 kg-km/h + 1200×(v kg-km/h)
1200×(v kg-km/h) = -7500
v = - 6.25 km/h.
Hence, the lighter car is moving at 6.25 km/h South after the collision.
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Question 1 (2.5 points)
Which of the following safety guidelines is NOT important to this lab experiment?
Use wet paper towels or a fire extinguisher to put out small fires.
Ensure that you have a clean working space to minimize errors.
Wear goggles when there are flying objects near your face.
Read instructions before beginning the lab so you know what you are doing.
Question 2 (2.5 points)
As the number of washers goes up, what happens to the mass and the centripetal force on the apparatus?
mass goes up, centripetal force goes down
mass goes up, centripetal force goes up
mass goes down, centripetal force goes down
mass goes down, centripetal force goes up
Question 3 (2.5 points)
What is the independent variable in this experiment?
number of washers
radius (length of string)
time for 20 revolutions
velocity
Question 4 (2.5 points)
What is the dependent variable in this experiment?
number of washers
radius (length of string)
time for 20 revolutions
velocity
Question 5 (2.5 points)
Why is it important to keep the length of the string the same?
Because it can affect the velocity by affecting the circumference.
To make the experiment easier.
Because that is the only length it will work properly at.
Because that is the only length it will work properly at.
Question 6 (2.5 points)
As the number of washers goes up, what happens to the circumference?
The circumference increases.
The circumference decreases.
The circumference stays the same.
What's a circumference?
Question 7 (2.5 points)
As the number of washers goes up, what happens to the time for 20 rotations?
The time increases.
The time decreases.
The time stays the same.
Question 8 (2.5 points)
As the number of washers goes up, what happens to the velocity?
The velocity increases.
The velocity decreases.
The velocity stays the same.
Question 9 (2.5 points)
Which of these is the best defintion for PERIOD in this experiment?
The time for one wave.
The time for one class.
The time for one revolution.
The dot at the end of a sentence.
Question 10 (2.5 points)
Why do we measure the time for 20 revolutions instead of the time for one revolution?
To get more accurate results.
Because human reaction time is too slow to reliably measure one revolution.
To reduce human errors in the results.
All the other answers are correct.
Answer:
I took the test on K12 and got an A
1. A
2. B
3. A
4. C
5. A
6. C
7. B
8. A
9. C
10.C
A plane travels a distance of 3,650 kilometers in 5.50 hours. What is the average speed of the plane
Answer: 625.71km/h
Explanation: Divide the numbers.
One mole (6.02×10^23 atoms) of helium atoms in the gas phase has 3700 J of microscopic kinetic energy at room temperature. Assume that all atoms move with the same speed. The mass of a helium atom is 6.68×10^−27 kg. What is the speed of a helium atom?
This question involves the concepts of kinetic energy, and rms speed.
The rms speed of helium atom at 5800 K is "1.05 x 10¹⁵ m/s".
We will use the formula of the average kinetic energy of gas molecules to find out the rms speed of the hydrogen atom. rms speed is the root mean square speed of an atom:
[tex]K.E =\frac{1}{2}mv^2\\\\v=\sqrt{\frac{2K.E}{m}}[/tex]
where,
v =rms speed = ?
K.E = Kinetic Energy of Helium atoms = 3700 J
m = mass of hydrogen atom = 6.68 x 10⁻²⁷ kg
Therefore,
[tex]v=\sqrt{\frac{2(3700 J)}{6.68\ x\ 10^{-27}\ kg}}\\[/tex]
v = 1.05 x 10¹⁵ m/s
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What are electromagnetic waves?
A:Waves that have different colors and can travel through
the emptiness of space.
B:Waves that can travel through the emptiness of space
very slowly
C:Waves that can travel through the emptiness of space
and stops when it gets close to the earth's
atmosphere.
D:Waves that can travel through the emptiness of space,
at the speed of light.
D: Sóng có thể truyền qua khoảng không của không gian,
với tốc độ ánh sáng.
true or false Air pressure is highest at the bottom of a tornado's funnel?
Answer:
False. It is typically very low at that point.
Explanation:
How do I start this question?
Answer:
Typing in the keyboard the question that you have
Explanation:
Your own car has a mass of 1200 kg. If your car produces a force of 6000 N, how fast will it accelerate?
Heyyy! Okay riddle of the day
no looking up the answers. If you don’t know move on.
Here’s the riddle: what time is it when an elephant sits on a fence?
Answer:
Time to get a new fence...?
C'mon that's pretty cringe lol
Please give brainliest
have a nice day :D
Hello, I wanted an answer from a mathematician. The number 1.04 is closer to the number 1, 2, 1.25 or 1.5.
Answer:
1
Explanation:
line them up in order.
1, 1.04, 1.25, 1.5, 2
1.04 is in the middle of 1 and 1.25
1.04-1=0.04
1.25-1.04= 0.21
Answer:
1
Explanation:
1.04 lies between 1 and 1.25.
1.04 is 0.21 away from 1.25
1.04 is 0.04 away from 1.
0.04<0.21
Question 5 of 5
What do the arrows in the photograph represent?
BALANCED FORCES
When two forces acting on an object are equal in size but act in opposite directions, we say that they are balanced forces . a stationary object stays still. ... a moving object continues to move at the same speed and in the same direction.
- BRAINLIEST answerer
Which of the following atoms contain a nucleus with no neutrons.
helium
hydrogen
deuterium
tritium
Answer:
Hydrogen
Explanation:
(H) atom does not have any neutrons in it's tiny nucleus.
Answer: C. Hydrogen
Explanation: Now I can answer the question lol, that bot didn't let me.
Two spheres each have a mass of 2.0 x 10 kg. How far apart must they be to exert a
gravitational force of 50 N between them?
a).016 m b) 231 m c) 53,000 m
d) 110,000 m
e) 6.7 x 10" m
Hi there!
We can use the Gravitational Force equation:
[tex]F_g = \frac{Gm_1m_2}{r^2}[/tex]
Fg = Gravitational force (N)
m₁, m₂ = mass of spheres (kg)
r² = distance between the spheres
G = Gravitational Constant
We are given the force of gravity, so we can rearrange the equation to solve for r:
[tex]r^2F_g = Gm_1m_2\\\\r = \sqrt{\frac{Gm_1m_2}{F_g}}[/tex]
Plug in the given values:
[tex]r = \sqrt{\frac{(6.67*10^{-11})(2.0*10^9)(2.0*10^9)}{50}} = \boxed{231 m}[/tex]
Therefore, the correct answer is B) 231 m.
Electrical energy is the energy of e_____________________________ charges.
Answer:
Electrical energy is the energy derived from ELECTRIC POTENTIAL ENERGY or KINETIC ENERGY of the charged particles. In general, it is referred to as the energy that has been converted from electric potential energy.
who discovered earth was like a big magnet
The total momentum of a system of two moving identical bodies is zero. What should be true about the velocities of the bodies?
A) The velocities should be equal in direction and opposite in magnitude.
B) Both velocities should be zero
C) Both velocities should be equal in magnitude and opposite in direction
D) the velocities should be equal in magnitude and opposite in direction
For a zero total momentum of two bodies, the two velocities of the two bodies should be equal in magnitude and opposite in direction
According to the principle of conservation of linear momentum, the total momentum of an isolated system is constant.
[tex]Pi = P_f \\\\m_1u_1 + m_2u_2 = m_1v_1 + m_2 v_2[/tex]
where;
u is the initial velocity of the two bodiesv is the final velocity of the two bodiesm is the mass of the two bodiesWhen the total momentum is zero, the velocities of the two bodies will have equal values but opposite signs.
Thus, we can conclude that for a zero total momentum of the two bodies, the two velocities should be equal in magnitude and opposite in direction
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PLS HELP!!!!
by pushing the crate up the ramp rather than lifting it to the platform, you are using ________ force, but moving the crate a ____________ distance
A) more; less
B) more; greater
C) less; greater
D) the same amount; greater
Answer:
a
Explanation:
rwggwh4
Describe at least two ways to determine whether a relationship is proportional.
If two different quantities are given, how to check whether the relationship between them is proportional ? We have to get ratio of the two quantities for all the given values. If all the ratios are equal, then the relationship is proportional. If all the ratios are not equal, then the relationship is not proportional.
a 225 kg crate is pushed horizontally with a force of 710n
Answer:
acceleration is 3.155
Explanation:
F = ma
710 = 225 a
a = 710/225
a = 3.155
The pressure of a constant volume gas thermometer is 2100N/M squared at 38c. What will be the temperature of the gas when the pressure is increased by 1/3?
Answer:
Explanation:
In
A pulley system has an efficiency of 87.5 percent.
How much of the rope must be pulled in if a force of
648 N is needed to lift a 150 kg desk 2.46 m?
(Disregard friction.)
Answer:
work done on desk = m g h = 105 * 9.81 * 2.46 = 2534 Joules
Explanation:
so work in = 2534 / 0.875 = 2896 Joules
that is your 648 times distance your hand moved holding the rope
2896 = 648 * x
4.47 meters
I think maybe a typo, 648 N is too big, maybe 64.8 ? Any block and tackle system does better than that.
What are three kinds of forces that affect an object’s motion? What effects do these forces have?
one-celled organism
Many-celled organism
the food making process
Answer:
Different forces (including magnetism, gravity, and friction) can affect motion
Identify if the verbs signal past, future, or present tense, and drag them to the appropriate box. I walked home. She will walk home. It will open next week. She studied. He made a list. She walks home. They leave the door open. Past Present Future. NO LINKS
Answer:PAST she studied
Present: she walks home, they leave the door open, I walked home, he made a list.
Future: It will open next week, she will walk home.
Explation:Its obvious
If the acceleration vector of an object is directed parallel to the velocity vector, then Select one:
O a. the object is moving with a constant velocity.
O b. the object is turning.
O c. the object is at rest.
O d. the object is slowing down
O e. the object is speeding up.
Answer:
a. The object is moving with a constant velocity.
Using sound waves signals allow oceanography to determine ocean depth
Answer:
echosounding
Explanation:
The time taken for the sound to travel through the ocean and back is then used to calculate water depths. The faster the sound waves return, the smaller the water depths and the higher the elevation of the seafloor.
4. If an object had a mass of 216 g on Earth what would its mass be on the Moon?
Answer: Weight changes with surface gravity.So in Moon mass will be same as 26 gram mes.
Explanation:
if a 50.0 kg mass weighs 554 n on the planet saturn, calculate saturn's radius
Answer:
this is impossible unless im doing my math wrong sorry
Explanation:
can anyone heelp me plzz plzz
imagine that the Earth's rotation slowed down to one half of its original speed. What would life be like? Write a response that describes how your life would change. As always, write in complete sentences!
Explanation:
if you meant ¾ of it's original speed then a day would have 42 hours thus making days & nights longer. Our weight would be more, because as the Earth would rotate slower, it would exert less centrifugal force on us. There would also be a temperature change as each hemisphere (Eastern and Western) would get more time to warm up from the Sun's rays. the year would obviously have half the amount of days and week which would mess up our schedules as well as our holidays and lastly there'll be younger deaths.
name a suitable thermometer for steady temperature of 1000 degree Celsius?
Answer: A platinum resistance thermometer
Explanation:
It is a versatile instrument for temperature measurement in the range from — 200° to 1000°C. It is used both for precision measurements of the highest accuracy and for routine industrial work.
Answer:
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What characteristics do black holes have?
