Answer:
Acceleration is the rate of change of velocity. If an object is changing its velocity, its speed, or changing its direction, then it is said to be accelerating.
Explanation:
when you change directions or speed up you are accelerating (or decelerating) and when you change directions or speed its called velocity.
Consider a system to be one train car moving toward another train car at rest. When the train cars collide, the two cars stick together. What is the total momentum of the system after the collision? 800 kg • m/s 1,600 kg • m/s 2,400 kg • m/s 4,000 kg • m/s.
The momentum of the body is given by the product of the mass and velocity of the body. The total momentum of the system after the collision is 2400 kgm/sec.
What is the law of conservation of momentum?According to the law of conservation of momentum, the momentum of the body before the collision is always equal to the momentum of the body after the collision.
The momentum of the body is given by the product of the mass and velocity of the body.
According to the law of conservation of momentum
Momentum before collision =Momentum after collision
The given data in the problem is;
mass of train m₁ = 600
mass of car m₂= 400
the velocity of train = 4 m/sec
velocity of car =0 m/sec (rest)
Momentum after collision;
[tex]\rm M_f=m_1v_1+m_2v_2 \\\\\ \rm M_f=600 \times 4 +400 \times 0 \\\\ \rm M_f=2400\;kgm/sec[/tex]
Hence the total momentum of the system after the collision is 2400 kgm/sec.
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Answer:
2,400 kg • m/s
Explanation:
A 2 µC charge q1 and a 2 µC charge q2 are 0. 3 m from the x-axis. A 4 µC charge q3 is 0. 4 m from the y-axis. The distances d13 and d23 are 0. 5 m. Find the magnitude and direction of the resulting vector R. Round your answer to the nearest tenth.
The net force on q₃ is 0.46 N vertically upwards along the +Y axis. The product of the two charges is directly proportional to the force.
What is Coulomb's law?The electrostatic force is directly proportional to the product of the two charges and inversly proportional to the product of the two charges.
The given data in the problem is;
F is the electric force =?
Q₁ is the charged particle 1 = 2 C
Q₂ is the charged particle 2 = 2 C
d₁₂ is the distance between particles = 0.5 m
The electric force is given by;
[tex]\rm F=\frac{ Kq_1q_2}{r^2} \\\\[/tex]
[tex]\rm F=\frac{ 9\times 10^9 (2\times 10^{-6} \times 4\times10^{-6}}{(0.5)^2} \\\\\rm F=0.288\ N[/tex]
This force is applied on both charges
So the result of the net force is given by;
[tex]\rm F_{net}= 2Fcos \theta \\\\ \rm F_{net}==2 \times 0.288 cos 37^0 \\\\ \rm F_{net}=0.46 \ N[/tex]
Hence the net force on q₃ is 0.46 N vertically upwards along the +Y axis.
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Answer:
Explanation:
E2020
convection is the transfer of energy by the motion of heated particles in a fluid. according to this information,which statement best describes an example of convection
A a shirt heated by an iron
B a puddle heated by the sunlight
C a dark colored car heated by sunlight
D warm air rising
Answer:D warm air rising
A student puts a piece of ice into a beaker of cold water. Which two statements are true. Please help
Answer:
A. Thermal energy will move from the water to the ice.
B. Thermal energy will move from air to the water.
C. Thermal energy will move from the ice to the air.
D. Thermal energy will move from the water to the air.
A and B are correct
Explanation:
Because thermal energy will move from the water to the ice
A weight lifter pulls on a 225 kg bar with 1600 N of force, but the bar does not move. How much work
is performed? (show your work)
A. 0 J
B. 7.1 J
C. 1375 J
D. 1825 J
Answer:
A
Explanation:
its A bro trust me ik it is
8. Lee is rolling along her 4.0-kg skateboard with a constant speed of 3.0 m/s when she jumps off the back and continues forward with a velocity of 2.0 m/s relative to the ground. This causes the skateboard to go flying forward with a speed of 15.5 m/s relative to the ground. What is Lee's mass?
From the principle of conservation of linear momentum, the mass of Lee is 50 Kg.
What is momentum?Momentum is the product of mass and velocity. The principle of conservation of linear momentum states that the total momentum before collision is equal to the total momentum after collision.
Let the mass of Lee be m
Hence;
(4.0-kg × 3.0 m/s) + (m × 3.0 m/s) = (4.0-kg × 15.5 m/s) + (m × 2.0 m/s)
12 + 3m = 62 + 2m
12 - 62 = 2m - 3m
-50 = -m
m = 50 Kg
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FIND A RELATION BETWEEN DIRECTION OF ACCELERATION AND THE APPARENT WEIGHT
please help me with this work
As mass increases, what happens to the gravitational force? A. It increases. B. It decreases. C. It stays the same. D. It acts as a 3rd degree derivative function
Answer:
A
Explanation:
Because based on newton's law of universal gravitation
*since the gravitational force is directly proportional to the mass.so the mass of object increases,the force of gravitational attraction also increases.
Two balls at the ends of two strings are moving at the same
speed in horizontal circular paths. One string is three times
as long as the other. Compare the magnitudes of the two
centripetal accelerations.
Answer:
Fc = M v^2 / R centripetal acceleration
Fc2 / Fc1 = R1 / R2 since M and v are the same for both
If R2 = 3 R1 then the centripetal acceleration for particle 2 will be 1/3 of that of innermost (R1) particle
A cylinder of lead has a diameter of 3 centimeters and a height of 8 centimeters. The density of lead is 11.4 g/cm3. What is the mass of the cylinder
Answer:
m = 644.67
Explanation:
m = v x d
m = pi x r^2 x h x d
m = 56.55 x 11.4
The mass of the cylinder with diameter and height of 3 cm and 8 cm respectively is 644.3 grams.
Which term is equivalent to product of density and volume?The product of density and volume of a body represents its mass. Mathematically -
M = V x ρ
ρ - density
M - mass
V - volume
Given is a cylinder of lead that has a diameter of 3cm and a height of 8 cm. The density of lead is 11.4 g/cm3.
The product of density and volume of a body represents its mass
M = V x ρ
Volume of cylinder = πr²h
Therefore, we can write -
M = πr²h x ρ
M = 3.14 x 3/2 x 3/2 x 8 x 11.4
M = 56.52 x 11.4
M = 644.3 grams
Therefore, the mass of the cylinder with diameter and height of 3 cm and 8 cm respectively is 644.3 grams.
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Consider a bowling ball and a soccer ball on a flat surface.
What would best describe the movement of the two balls if both were pushed with the same force?
Answer:
The Soccer ball would travel the furthest then the bowling ball
Explanation:
The Soccer ball would travel the furthest then the bowling ball because heavier objects require more force. This example can be compared with us pushing a huge rock vs us pushing a small rock, of you thing about it the small rock moves easily then the huge rock and this is due to their difference in their mass.
2 electric cells are called
Answer:
solar cell. electrolytic cell, electrochemical cell
1. In a certain wire, 10 C of charge passes through it in 100 seconds. What is
the current in the wire?
Answer:
the correct answer is 10 wires
Explanation:
So you divide 10x the seconds then you know that 10x10 is 100 and then the answer becomes 10.
Inelastic collisions do not conserve kinetic energy. Does
this violate the Law of Conservation of Energy?
Answer:
No. Because undefined amounts of energy are also released in deformation of the objects, heat released, etc.
In some years there are more hurricanes than usual. This is probably because In some years there are more hurricanes than usual. This is probably because there are more windy days than usual. the ocean is warmer than usual. the gravitational pull of the Moon is stronger. the ozone layer is very thin.
Answer:
the ocean is warmer than usual
Explanation:
When the ocean is warmer than usual, more water precipitates upwards into the formation of rain-heavy clouds. When these clouds cross over land and release this large amount of water, hurricanes can be caused.
hope this helps!
A record spins at 33 rpm (revolutions per minute), which is an angular velocity of about 3.46 radians per second. What is the approximate linear velocity of a fly that sits on the record, 12 cm from the center
Hi there!
We can use the following equation to relate angular velocity to linear velocity.
[tex]v = \omega r[/tex]
v = linear velocity (m/s)
ω = angular velocity (3.46 rad/sec)
r = distance from axis of rotation (.12 m)
Plug in the given values.
[tex]v = (3.46)(.12) = \boxed{.415 \frac{m}{s}}[/tex]
A planet is orbiting its star at a maximum radius of 1.2 x 10^7 meters. If the mass of the star is 2 x 10^30 kg, what is the time period of the orbit?
22.6 seconds
A. 80 seconds
B. 22.6 days
C.80 days
D.22.6 minutes
What is the wavelength of this wave?
Frequency: 2 Hz
Speed: 5 cm/s
2.5 Hz
2.5 cm
Answer:
2.5 cm
Explanation:
velocity = frequency × wave length
5 = 2 × wave length
wave length = 5÷2 = 2.5 cm not Hz because wave length is distance and measured by cm or m
Explain why the teenager and the wheelchair don't have the same kinetic energy, even though they have the same speed
Answer:
their weight difference
Explanation:
weight adds to kinetic energy. a heavier object will have a higher kinetic energy because the extra weight will slowly increase or decrease the velocity depending on if it's being sent down a decline or inclined plane
A 0.85 kg soccer ball is booted straight up in the air. If it left the soccer player's foot at a height of 1.0 m and reaches a height of 47.0 m, what was its kinetic energy immediately after it was kicked?
Answer:
383 J
Explanation:
m = 0.85 kg, h = 1.0 m, H = 47.0 m
Find KE at h
At h, total energy = KE + mgh
At H, KE = 0, total energy = mgH
Energy conservation:
KE + mgh = mgH
so KE = mgH - mgh = mg(H - h) = 0.85*9.8*(47.0-1.0) = 383 J
A force of 15 newtons is used to push a box along the floor a distance of 3 meters. How much was done?
Answer:
[tex]45 J[/tex]
Explanation:
The equation for work is:
[tex]Work=Force*Distance[/tex]
We can substitute the given values into the equation:
[tex]Work=15N*3m\\Work=45Nm\\Work=45J[/tex]
Answer:
45 J
Explanation:
w =fd
w = 15(3)
As a bullet shot vertically upward rises, the kinetic energy of the bullet
The kenitc energy of the bullet lowers as it keeps going up.
Because gravity is pushing the bullet down as the bullet goes up.
I'm pretty sure that the way to put this answer.
19) A navy cargo plane drops drops bundles of shelters and mosquito nets onto a field in rural
Kenya. It is moving with a constant horizontal speed at an elevated height. Assuming that air
resistance is negligible, where will the packages land relative to the plane?
A) directly below the plane
B) below the plane and behind it.
C) below the plane and ahead of it
D) below the plane and both behind and ahead of it
Answer:
B) below the plane and behind it.
Answer and explanation please, much appreciated!!
Answer:
Done
Explanation:
I already answered this problem when you had previously asked for it. Kindly refer that solution.
The input force of 29.3 N acting on the effort arm of a lever moves 1.7 m, which lifts a 1 N weight resting on the load arm a distance of 11.1 m. What is the efficiency of the machine (in %, rounded to the nearest 0.1)?
Hey this is for high school or middle school
Which changes would cause an increase in the resistance of a wire? Check all that apply.
Answer:
The answer is increasing its temperature to longer and thinner.
please help
Newton second law of motion is F =ma
Answer: ma is the formula of Newton's Second Law of Motion. Newton's Second Law of Motion is defined as Force is equal to the rate of change of momentum. For a constant mass, force equals mass times acceleration.
Explanation: Newton's second law of motion is F = ma, or force is equal to mass times acceleration.
Hi there!
Using Newton's Second Law:
[tex]F = ma[/tex]
F = Net Force (60 N)
m = mass (30 kg)
a = acceleration (m/s²)
Solve for acceleration given the other values.
[tex]60 = 30a\\\\a = \frac{60}{30} = \boxed{2 \frac{m}{s^2}}[/tex]
If the net force increases (while the mass is held constant), the acceleration will INCREASE.
If the mass of the object increases (while the net force is held constant), then the acceleration will DECREASE.
an airplane maintains a heading (W20N)at an airspeed of 900 km/h. It is flying through a hurricane with winds of 300 km/h, from the northeast.
a) In which direction is the plane moving relative to the ground?
(B) -what is the ground speed
(C)how long would it take the plane to fly from one city to another 500 km away along the path in (b)
Show working!!
Answer:
tan x = 60/700
x = 4.9 degree east north
v = √(60^2 + 700^2)
v = 702.6 kph
hope this helps
How far does a car go in 30 seconds at a speed of 29 m/s? (The equation for
distance is d = st.)
d = speed x time
distance = 29 x 30
distance = 870m
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