8. Calculate the impulse of a 14kg rock that starts at rest and falls to a speed of 6m/s?
Answer:
84 kgm/s
Explanation:
mvf - mvi = impulse
(14kg)(6m/s) - (14kg)(0m/s) = 84 kgm/s
Which of the following statements about mechanical energy is NOT true?
O Gravitational potential energy is a type of mechanical energy.
Kinetic energy is a type of mechanical energy.
O Mechanical energy is the energy an object possesses due to its motion or its position.
O A bungee cord is not an example of mechanical energy.
a rail car moving at 10m/s collides with and connect to another stationary car. What is their final velocity?
Assume they have the same mass
Answer:
read this it might help some
When a moving object collides with a stationary object of identical mass, the stationary object encounters the greater collision force. When a moving object collides with a stationary object of identical mass, the stationary object encounters the greater momentum change.
Explanation:
which scientists describes an atom as a mass of positive charges containing negative electrons
Answer:
it was Ernest Rutherford
Body language is (peer counseling)
the way you make words with your hands
the way you make words by nodding your head
the way you speak by blinking your eyes tightly
the way you speak with your entire body
Answer:
the way you speak with your entire body
Explanation:
Body language is the way you speak with your entire body. Therefore, the correct option is option D.
What is body language?Body language refers to a form of communications in which information is expressed or conveyed via bodily behaviors rather than words. Face expressions, body posture, movements, eye movement, touch, and use of space are examples of this type of behavior.
Although the phrase "body language" is typically used in reference to people, it can also be used in reference to animals. Kinesics, another name for the research of body language, is related. Although facial expression is a crucial component of communication, much of it occurs subconsciously. Body language is the way you speak with your entire body.
Therefore, the correct option is option D.
To know more about body language, here:
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A baseball has a mass of 0.145 kg and is 12 m above the ground. If it has a mechanical energy of 105.8 J, how fast is it moving?
17 m/s
35 m/s
89 m/s
130 m/s
Answer:
35 m/s
Explanation:
b
Compare the Force for helmet with base radius of 10 cm vs helmet with 30 cm
Answer:
Explanation:
i literlly have no idea
A man weighing 70 kg runs alongside railroad tracks with a velocity of
18 km/h, and jumps into a car of weight 100 kg standing on the tracks.
Calculate the velocity with which the car and man will start moving.
Answer:
Mass of man (m1) = 60kg
Initial velocity of man (u1) = 18 km/h=18x5/18=5m/s
Final velocity of man (v1) = (v2) = v
Mass of car (m2)= 100kg
Initial velocity of car (u2) = 0 (as it is in rest)
Final velocity of car (v2) = v
According to law of conservation of momentum,
m1u1 +m2u2 = m1v1 + m2v2
60x5 + 100x0 = 60 x v + 100 x v
300+0 = 160v
v = 300/160
v = 1.875 m/s
In which area of a street should cyclists ride?
Answer:
the same side as cars are traveling
:)
HELP ✋‼️‼️
What happens to the speed of a sound wave as it travels from air into glass?
Water
Diamond
Glass
Air
1,493
12,000
5,640
346
Speed of
sound
(m/s)
O A. It falls to zero.
B. It decreases.
O c. It stays the same.
D. It increases
Answer:D increases
Explanation:
When sound travels from air into glass, speed of a sound wave increases. Hence option D is correct.
What is a wave ?Wave is a disturbance in a medium that carries energy as well as momentum . wave is characterized by amplitude, wavelength and phase. Amplitude is the greatest distance that the particles are vibrating. especially a sound or radio wave, moves up and down.
Amplitude is a measure of loudness of a sound wave. More amplitude means more loud is the sound wave.
Wavelength is the distance between two points on the wave which are in same phase.
Phase is the position of a wave at a point at time t on a waveform.
speed of the sound is greatest in solid and it is medium in liquid and lowest in gaseous state.
In this problem sound wave is going from air to glass, it is actually going from gaseous to solid state, as speed of sound is greatest in the solid, speed of the sound increases to 5.640 m/s.
Hence option D is correct.
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suppose kinetic energy is 4 joules of a moving object what will happen if we increase the speed twice
(guys pls show me the work out)
Answer:
The kinetic energy is 16 joules.
Explanation:
Kinetic energy (E) is given by:
[tex] E = \frac{1}{2}mv^{2} [/tex]
Where:
m: is the mass
v: is the speed
When the kinetic energy is 4 joules, the speed of the object is:
[tex] v_{1}^{2} = \frac{2E_{1}}{m} = \frac{8}{m} [/tex]
Now, if the speed is increased twice then we have:
[tex] E_{2} = \frac{1}{2}mv_{2}^{2} = \frac{1}{2}m(2v_{1})^{2} = \frac{1}{2}m[4(\frac{8}{m})] = 16 J [/tex]
Therefore, the kinetic energy is 4 times the initial value.
I hope it helps you!
What is the minimum force required to increase the energy of a car by 84 J over a distance of 38 m? Assume the force is constant.
Group of answer choices
84 N
2.2 N
3200 N
120 N
0.45 N
Answer:
2.210N
Explanation:
Workdone = Force x distance
Distance = 38m , Workdone = 84J
Hence 84J = Force x 38m
Force = 84J / 38m
Force = 2.210N =2.2N
When the north poles of two magnets are kept close , they will __________
attract
rotate
repel
remain unaffected
Calculate the density of mass 150 grams and volume 35 〖cm〗^3
Explanation:
Mass =150g = 0.15kg
Volume= 35cm^3 = 0.35m^3
Density= Mass×Volume
= 0.15kg × 0.35m^3
= 0.05 kg m^3
An object is most likely to become electrically charged by gaining or losing which type of particles?
neutral particles
positive particles
negative particles
none of the above
Answer:
negative particles
Explanation:
An atom can be defined as the smallest unit comprising of matter that forms all chemical elements. Thus, atoms are basically the building blocks of matters and as such defines the structure of a chemical element.
Generally, these atoms are typically made up of three distinct particles and these are protons, neutrons and electrons.
In Chemistry, electrons can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.
Valence electrons can be defined as the number of electrons present in the outermost shell of an atom. Valence electrons are used to determine whether an atom or group of elements found in a periodic table can bond with others. Thus, this property is typically used to determine the chemical properties of elements.
Hence, an object is most likely to become electrically charged by gaining or losing negative particles.
A constant net force of 20 N is applied to a 32kg car, causing it to speed up from 4.0 to 9.0 m/s. How long is the force applied
Answer:
8 seconds
Explanation:
From Newton's second law;
Ft = m(v-u)
F = Force applied
t = time taken
v = final velocity
u = initial velocity
20 * t = 32 (9 - 4)
20t = 32 * 5
t = 32 * 5/ 20
t = 8 seconds
What is Justice according to philosophy
Answer:
justice. just in nature.
Explanation:
the concept of a proper proportion between a person's deserts (what is merited) and the good and bad things that befall or are allotted to him or her. ... Aristotle's discussion of the virtue of justice has been the starting point for almost all Western accounts.
ANSWER CORRECTLY ONLY PLEASE ITS DUE IN 25 MINUTES
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Krishne wants to measure the mass and volume of a key. Which tools should she use?
A. a balance and a beaker of water
B. a balance and a meter stick
C. a beaker of water and a ruler
D. a ruler and a meter stick
Answer:
A. a balance and a beaker of water
Explanation:
The balance is for mass.
The beaker of water is for volume.
what would happen to the size of the shadow if the distance between the light and the hand is increased.
I should limit the number of carbohydrates leat, as often as possible, to avoid gaining weight. * 2 True O False
Answer:
I THINK it's True
Explanation:
Because...
you can get fat...
who organized the modern periodic table?
A) Dalton
B) Mendeleev
C) Rutherford
D) Thomas
Answer:
Mendeleev
Explanation:
He discovered the periodic table trying to organize the elements in 1869
explain about ohm's law.
Answer:
Statement:
The electric current passing through a conductor is directly proportional to the potential difference across its ends provided temperature and other physical conditions remain constant.
Explanation:
Current is directly proportional to voltage loss through a resistor. That is, if the current doubles, then so does the voltage. To make a current flow through a resistance there must be a voltage across that resistance. Ohm's Law shows the relationship between the voltage (V), current (I) and resistance (R).
V∝I or I∝V⇒V=IR.
Explanation:
Ohm's law states that the current through a conductor is proportional to the voltage across the conductor. This is true for many materials (including metals) provided the temperature (and other physical factors) remain constant. The constant of proportionality, R,R is the resistance and the unit is the ohm, with symbol \Omega,Ω. The relationship can be written as:
V, equals, I, R.
V=IR
where V,V is the voltage across the conductor and I,I is the current flowing through it. If a component is ohmic (it obeys Ohm's Law), then its resistance must be independent of current and voltage.
I need help with my science.
Answer:
1: 2
2: 5
Explanation:
hope this helps <3
Each planet has several properties for which scientists colleci Uald. Angle of Axis Tilt Planet Orbital Length Speed of Day (km/s) (hours) Mass (kg) 30 24 Earth 23.4° 6.0 x 1024 Saturn 26.7° 11 5.7 x 1026 10 Another characteristic of Saturn is that it has a much thicker atmosphere than Earth. Based on is most responsible for this difference? O A. their different orbital speeds O B. their difference in length of day O C. their different axis angles of tilt O D. their difference in mass Reset Next Question
Answer:
so basically
Explanation:
ty for the free points tho ez ez ez ez jajjajajajajajjajaj ez ez ez free cash dog water
Choose the way that machine may change force...
Doc Below
fjfjfj
Explanation:
rufifiriirifieif
Answer:it’s all of the above for the ck-12
Explanation:
Kitty is pushing her shopping trolley along the ground. She applies a constant force to move the trolley 4 m horizontally. If she does 32 J of work, calculate how much force she is applying.
Answer:
the constant force applied by Kitty is 8 N.
Explanation:
Given;
work done by Kitty, W = 32 J
distance moved by Kitty's trolley, d = 4 m
Let the constant force applied by Kitty = F
The work done by Kitty is calculated as follows;
W = F x d
F = W / d
F = 32 / 4
F = 8 N.
Therefore, the constant force applied by Kitty is 8 N.
What is the origin of cold, wet air masses?
A. Over water in tropical zones
B. Over land in polar regions
C. Over land in tropical areas
D. Over water in polar regions
Answer:
b
Explanation:
if it's over land and in polar region it's B
Answer:D
Explanation:
trust me
When will an object falling toward earth stop accelerating
Answer:
Hope this helps!
Explanation:
As an object falls, it picks up speed. The increase in speed leads to an increase in the amount of air resistance. Eventually, the force of air resistance becomes large enough to balances the force of gravity. At this instant in time, the net force is 0 Newton; the object will stop accelerating. An object falling toward earth stop accelerating when it velocity becomes terminal velocity. Or When weight becomes equal to Drag force acting on the object due to air resistance.
Circle the letter of each sentence that is true about calculating the
acceleration of a moving object.
A.) If an object is moving without changing direction, then its acceleration is the change in its speed during one unit of time.
B.) If an object's speed changes by the same amount during each unit of
time, then the acceleration of the object at any time is the same.
C.) To determine the acceleration of an object, you must calculate the
change in velocity during only one unit of time.
D.) If an object's acceleration varies, then you can describe only average
acceleration.
Answer: D
Explanation:
Charges of 7.2nC and 6.7nC are 32 cm apart. Find the equilibrium position for a -3.0nC charge.
Answer:
I don't know I'm sorry I will tell you another answer asks me