Answer:
7 m/s
Explanation:
Find the total mass
m1+m2 = total mass
700kg+300kg = 1000kg
Find the velocity of each mass
v1 = 10m/s
v2 = 0m/s
Find the combined momentum
m1v1 + m2v2 = mfvf
(700)(10)+(300)(0)=(1000)(vf)
7000=1000(vf)
7=vf
So the velocity of the two cars rolling together is 7 m/s
What is the kinetic energy of a 0.50 KG ball that is traveling at a speed of 40m/s
Answer:
0.4kjKE = 1/2 mv2
KE = 1/2 mv2 KE = 1/2 (0.50kg) (40m / s)
KE = 1/2 mv2 KE = 1/2 (0.50kg) (40m / s) 2 KE = 1/2 (0.50) (402)
KE = 1/2 mv2 KE = 1/2 (0.50kg) (40m / s) 2 KE = 1/2 (0.50) (402) KE = 0.5 x 0.50 x 402
KE = 1/2 mv2 KE = 1/2 (0.50kg) (40m / s) 2 KE = 1/2 (0.50) (402) KE = 0.5 x 0.50 x 402 KE = 400 J
KE = 1/2 mv2 KE = 1/2 (0.50kg) (40m / s) 2 KE = 1/2 (0.50) (402) KE = 0.5 x 0.50 x 402 KE = 400 JKE = 0.4 KJ
Answer:
K. E = 1/2MV²
K. E = 1/2 x 0.50kg x (40m/s)²
K. E = 1/4kg x 1600m²/s²
K. E = 400
Which of the following is not a space rock?
A
a star
B
a comet
C
an asteroid
D
a meteoroid
Answer:
A
Explanation:
a star is a bolling gas so it not a space rock
A star is not a space rock. Thus, the correct answer is option A.
What is a star?A star is a type of astronomical object that consists of a luminous spheroid of plasma held together by gravity. The Sun is the closest star to Earth. Many other stars can be seen with the bare eyes at night, but due to their great distances from Earth, they appear as fixed points of light.
Many of the brightest stars have proper names, and the most prominent stars have been classified into constellations . As previously stated, a star is a massive self-luminous celestial body of gas that shines through radiation emitted by its internal energy sources. It is not a space rock.
Therefore, a star, which is self-luminous celestial body made up of gas, is not a space rock.
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The particles of an ice cube at 0°C (represented by the blue circles) come in contact with the particles of Juan’s hand at 37°C (represented by the orange circles). Which diagram correctly represents the temperature of the two substances and the direction of heat flow?
Answer:
its b
Explanation:
The diagram which correctly represents the temperature of the two substances and the direction of heat flow is shown below.
What is heat?Heat is also referred to as thermal energy and it can be defined as a form of energy that is transferred from one physical object to another, especially as a result of a difference in temperature.
During the process of heat conduction, heat is primarily transferred between objects with different degrees of temperature and materials that are directly in contact with each other.
In conclusion, heat is generally transferred from a hotter object (37°C represented by the orange circles) to a cooler object (0°C represented by the blue circles) as shown in the image attached below.
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A spring has a spring constant of 90N/m.How much potential energy does it store when stretched by 2 cm?
Answer:
The potential energy stored in the spring is 0.018 J.
Explanation:
Given;
spring constant, k = 90 N/m
extension of the spring, x = 2 cm = 0.02 m
The potential energy stored in the spring is calculated as;
U = ¹/₂kx²
where;
U is the potential energy stored in the spring
Substitute the given values in the equation above;
U = ¹/₂ x 90 N/m x (0.02 m)²
U = 0.018 J
Therefore, the potential energy stored in the spring is 0.018 J.
A small-motorized cart can go from a standing start to 42 m/s in 7 seconds. What is the acceleration rate of the cart?
Two billiard balls of equal mass move at right angles and meet at the origin of an xy coordinate system. One is moving upward along the y axis at 2.1 m/s and the other is moving to the right along the x axis with speed 3.8 m/s. After the elastic collision, the second ball is moving along the positive y axis. What is the final direction of the first ball, and what are their two speeds?
Answer:
sorry i cant figure this out
Explanation:
Question 6 of 10
Which two characteristics make electromagnetic waves effective in
communication?
O A. They carry more energy than visible light.
B. They do not require a medium to carry information.
C. They carry information very quickly.
D. They move faster through matter than through space.
Answer:
The answer is "Choice B and Choice C".
Explanation:
In this question, the two features, which make electromagnetic waves effective for interaction, which they don't really need a method of travel of data and move information quite fast. The motion among magnetic and electrical forces is generated by electromagnetic radiation. These waves will spread without the need for a source for their movement, and they have high speed and also the electromagnetic waves it has the same frequency as light.
hari planted to go abroad. change into negative
Answer:
Hari didn't plan to go abroad
Explanation:
Abroad planned to go to hari.
Fred is conducting a controlled experiment to test whether using a grow light at night will help a tomato plant grow faster. Below are the steps to Fred's experiment: Plant tomato plants in two separate, but identical, flowerpots. Place the flowerpots in the same area outside during the day. At night, bring both flower pots inside and place one in the dark and one under a grow light. Give the plants the same amount of food and water each week. Measure the growth of the plants. Draw conclusions based on the data collected. Which of the following variables must Fred hold constant in this experiment?
Answer:
the type of tomato plants used.
Explanation:
What is the period of a wave with a wavelength of 8 cm and a frequency of 0.5 hertz?(1 point)
0.125 seconds
2 seconds
4 seconds
0.0625 seconds
Answer:2 seconds
Explanation:
a boy of mass 40kg and a girl of mass 30kg play on the seesaw of negligible weight. if the boy sits 270cm from the pivot of the seesaw, where must the girl sit to make it balance
Answer:
The answer is 360
Explanation:
Follow me!!!
1. Why are the outer planets called “gas planets?”
Answer:
They are also called the gas planets because they consist mainly of hydrogen, or the giant planets because of their size. These planets usually have complicated system of many moons and often even rings of ice and/or dust. There are four Jovian planets in the Solar System: Jupiter, Saturn, Uranus and Neptune.
Answer:
They are also called the gas planets because they consist mainly of hydrogen, or the giant planets because of their size. These planets usually have complicated system of many moons and often even rings of ice and/or dust. There are four Jovian planets in the Solar System: Jupiter, Saturn, Uranus and Neptune.
Explanation:
i hope this helps :)
A horizontal pipe of diameter 0.933 m has a smooth constriction to a section of diameter 0.5598 m. The density of oil flowing in the
pipe is 821 kg/m3. If the pressure in the pipe is 7220 N/m2 and in the constricted section is 5415 N/m2, what is the rate at which oil is flowing?
Answer in units of m3/s.
Answer:s
Explanation:
What is the Kinetic Energy of a 120 kg object that is moving with a velocity of 15 m/s
Answer:
Kinetic Energy:120 x 15=1800
Explanation:
Answer:
13500J
Explanation:
Kinetic energy = (1/2×120)kg × (15m/s)^2
KE = 60kg × 225 (m/s)^2 = 13500J
6. Compare Which of the
following can carry the
most current?
a. 9-V battery
b. 220-V electrical outlet
c. 12-V battery
d. 110-V electrical outlet
What is the quantity measured in newton seconds?
Explanation:
The newton-second (also newton second; symbol: N⋅s or N s)[1] is the derived SI unit of impulse. It is dimensionally equivalent to the momentum unit kilogram-metre per second (kg⋅m/s). One newton-second corresponds to a one-newton force applied for one second.
Newton-second
Impuls Masse Geschwindigkeit.svg
For two objects moving with the same velocity (v), the object with the greater mass (m) will have the greater momentum (p).
HELP AGAIN 10 POINTS
A dog running with an initial speed of 7.5 m/s comes to a stop in 5 seconds. What is the
dog's displacement?
Answer:
4.6
Explanation:
If a dog running with an initial speed of 7.5 m/s comes to a stop in 5 seconds, then the displacement of the dog would be 37.5 m / s .
What is displacement?An object's position changes if it moves in relation to a reference frame, such as when a passenger moves to the back of an airplane or a professor moves to the right in relation to a whiteboard. Displacement describes this shift in location.
As given in the problem If a dog running with an initial speed of 7.5 m/s comes to a stop in 5 seconds, then we have to find the displacement of the dog.
The displacement of the dog = 7.5 × 5
= 37.5 m /s
Thus , If a dog running with an initial speed of 7.5 m/s comes to a stop in 5 seconds, then the displacement of the dog would be 37.5 m / s .
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what is the shape of the path traversed by the earth around the sun?
Answer:
The shape of the path transverse by the Earth around the sun is called an ellipse
Explanation:
:)
Why is visible light safe to humans ?
Explanation:
Visible light is the range of electromagnetic waves that humans can see. Anything that glows or gives off light makes waves of what we call visible light. The sun, light bulbs, candles and fire are all things that people automatically think of when it comes to light, but visible light comes from many sources and in many colors. Some other sources of visible light include: television and computer screens, glow sticks, and fireworks
Answer:
Visible light is visible because most of the gases in planetary atmospheres (oxygen, nitrogen, carbon dioxide, methane, ammonia…) are transparent to those wavelengths. We evolved to see those wavelengths because the atmosphere in visible light is transparent.
Explanation:
What is the man’s weight on Mars where the acceleration due to gravity is 3.7 m/s2?
Answer:
8.14n in mars
Explanation:
gravitational
1. A small light bulb is shining light on a basketball (diameter is 23 cm or 9 inches). The light bulb is 3 m from the closest side of the basketball. Behind the basketball, on the side away from the light bulb, is a wall 4 m from the basketball. Calculate the size (diameter) of the basketball's shadow on the wall
Answer:
The size (diameter) of the basketball's shadow on the wall is approximately 53.38 cm
Explanation:
The given parameters of the basketball are;
The diameter of the basketball = 23 cm (9 inches)
The distance of the light bulb from the closest side of the basketball = 3 m
The distance from the ball to the wall = 4 m
The distance from the light source to the center of the ball, d = 3 m + 0.23/2 m = 3.115 m
The angle the light ray makes with the edge of the ball, θ = arctan(0.115/3.115)
Therefore, the ratio of the shadow width divided by 2 to the distance from the light from the wall = 0.115/3.115
The distance from the light from the wall = 3 m + 4 m + 0.23 m = 7.23 m
Therefore;
((The width of the shadow)/2)/(The distance from the light from the wall) = 0.115/3.115
∴ ((The width of the shadow)/2)/(7.23 m) = 0.115/3.115
((The width of the shadow)/2) = 7.23 m × 0.115/3.115 = 16629/62300 m ≈ 0.2669 m = 26.69 cm
The width (diameter) of the shadow on the wall = 2 × 16629/62300 m ≈ 0.5338 m = 53.38 cm
The size (diameter) of the basketball's shadow on the wall ≈ 53.38 cm
examples of non viscous liquid
The fluids that have no resistance or zero resistance to internal friction are known as non- viscous fluids. • The fluid which has more resistance to flow is called viscous fluid. Viscosity is a property of a fluid, which is a degree of the amount of resistance between the fluid layers.
A transverse wave has a frequency of 200 Hz with a wavelength of 1.0 m. Determine the speed
of the wave.
Answer:
200 m\ s Ans .....
Explanation:
Data:
f = 200 Hz
w = 1.0 m
v = ?
Formula:
v = f w
Solution:
v = ( 200)(1.0)
v = 200 m\s Ans .........
This table lists the densities of four different substances.
SUBSTANCE
DENSITY (G/CM)
W
1.02
Х
3.07
Y
2.81
Z
0.98
If water has a density of 1.0 g/cm, which substance will float on the surface of water?
W
O a
Oь
Y
Oc
X N
Od
Answer:
GREATER than 1 g/cm. 3, it will SINK in water. LESS than 1 g/cm3, it will FLOAT in water. If an object's density is: Density of Object > Density of Liquid.
Explanation:
What is one difference between a total solar and a total lunar eclipse?
A: A solar eclipse happens once every 28 days. A lunar eclipse happens only during a full moon.
B: In a solar eclipse, the sun moves between Earth and the moon. In a lunar eclipse, the moon moves between the sun and Earth.
C: A solar eclipse can be viewed anywhere on Earth. A lunar eclipse can only be seen from the side of Earth facing the moon.
D: In a solar eclipse, it is Earth that is caught in the umbra of the moon. In a lunar eclipse, it is the moon that is caught in the umbra of Earth.
Answer:
Image result for What is one difference between a total solar and a total lunar eclipse?
During a total solar eclipse, the moon passes between Earth and the sun, casting a small, dark shadow on our planet. ... During a lunar eclipse, however, the Earth passes between the moon and the sun, casting its shadow — known as the umbra — onto the moon.
Answer:
D.
Explanation:
calculate the extra pressure when you are 10 meters under water. (density of water = 1000 kg/m3, g = 9.8 N/kg). Give a value only
Answer:
[tex]2.03\times 10^5\ Pa[/tex]
Explanation:
We need to find the extra pressure when you are 10 meters under water. The net pressure on us is given by :
[tex]P=P_o+\rho gh\\\\P=1.05\times 10^5+1000\times 9.8\times 10\\\\P=2.03\times 10^5\ Pa[/tex]
So, [tex]2.03\times 10^5\ Pa[/tex] is exerted on us at 10 m under water.
The cooling system of an automobile motor contains 20.0 kg of water. What is the Δt of the water if the engine operates until 836,000 J of heat have been added to the water?
Answer: 10 c
Explanation:
The cooling system of an automobile motor contains 20 kg of water, then the temperature change of the water is 10 °C.
What is heat?Heat is the result of the movement of kinetic energy from one substance or item to another, or from an energy source to a substance or object. Radiation, conduction, and convection are three different ways that this energy can be transferred.
The calorie (cal), the primary unit of heat in the International System of Units (SI), is the quantity of energy transfer necessary to raise the temperature of one gram of liquid from water by one degree's Centigrade, provided that the water's temperature is both higher than the freezing point and lesser than the boiling point.
The given data in the question is,
Heat, Q = 836000 J
Volume, V = 20 L
Mass, m = 20 kg
ΔT = Q/m[tex]C_p[/tex]
ΔT = (836000)/(20 × 4180)
ΔT = 10 °C
Therefore, the change in temperature will be equal to 10 °C.
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A 45-kg child sits on a 3.2-kg tire swing. What is the tension in the rope that hangs from a tree branch?
Answer:
472.36 N
Explanation:
The total mass with the tire and child would be 45 kg + 3.2 kg = 48.2 kg
Ft = force tension
Fg = force of gravity
Fnet=0 (because child is motionless and not accelerating)
0 = Ft - Fg
Ft = Fg
Ft = m*g
Ft = 48.2 kg * 9.8 m/s^2
Ft = 472.36 N
Hope this helps!!
A 45-kg child sits on a 3.2-kg tire swing. The tension of the rope is 472.36 N.
The parameters given in the question is
Mass of the child= 45 kg
Mass of the tire swing attached to the tree= 3.2 kg
What is Tension?Tension can be defined as the force that can gets transmitted through a rope, string or wire when they are pulled through any forces that should acting from opposite sides.The tension force can be directed throughout the length of the wire and also it pulls the energy equally on the bodies at the ends.All the physical object which will be in contact exerts some force on one another.The first step is to calculate the total mass. The total mass can be calculated as follows;
= Mass of the child + mass of the tire swing
= 45 + 3.2
= 48.2 kg
The tension can be calculated as follows,
= mass × acceleration
= 48.2 × 9.8
= 472.36
Hence, A 45-kg child sits on a 3.2-kg tire swing. The tension of the rope is 472.36 N.
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Write the theory of lightning
Answer:
Lightning is a discharge of electricity. A single stroke of lightning can heat the air around it to 30,000°C (54,000°F)! This extreme heating causes the air to expand explosively fast. The expansion creates a shock wave that turns into a booming sound wave, which is thunder.
Explanation:
:)