Two forces are applied to a 3 Okg block on a
frictionless horizontal surface, as shown in the
diagram below
Fi=25N
F2=10N
The acceleration of the block is
5.0 m/s2 to the left
2.0 m/s2 to the right
O 5.0 m/s2 to the left
6.0 m/s2 to the right
Next
Answers
Answer:
daaang i aint this smart :(
Explanation:
Answer:
The 5.0 One
Explanation:
I had this on a test and I guessed correctly
Related Questions
What three sports now permit professional athletes to complete in
the Olympics?
Answers
Answer: The executive board of the International Olympic Committee voted yesterday to allow professional tennis, ice hockey and soccer players under the age of 23 to compete in the 1988 Winter and Summer Games.
Superman stops a "speeding locomotive" of mass 8.0x103 kg in 4.0 seconds. If the train was originally moving at 40.m/s,
a) what is the change in momentum?
b.) What is the magnitude of the force which Superman exerts on the train?
Answers
Hello!
a) What is the change in momentum?
The change of the momentum is the velocity, because the velocity is reduced to zero.
We can calculate the aceleration, applicating the formula:
\(\boxed{a=\frac{V-Vi}{t} }\)
Like you see, the final velocity will be zero, so:
\(a = \dfrac{0m/s-40m/s}{4s}\)
\(a = \dfrac{-40m/s}{4s}\)
\(a = -10\ m/s^{2}\)
Like you see, the aceleration applicate by superman is of -10 m/s^2.
If the aceleration is negattive, means the velocity will decrease.
b.) What is the magnitud of the force wich superman exerts on the train?
For calculate the force applicate for superman, lets applicate the second law of Newton:
\(\boxed{F=ma}\)
Lets replace and resolve it:
F = 8x10^3 kg * (-10 m/s^2)
F = 8000 kg * (-10 m/s^2)
F = -80 000 N
The force applicated is of -80000 Newtons.
When the force is negative means the force applicated in the another direction of the object what is traveling.
during volleyball practice a volleyball is tossed over a net, starting from a height of 1.5 meters above the ground. after reaching the top of its trajectory it returns to its original height as it falls. how does the motion of the ball at the top of its trajectory compare to its motion as it passes its original height?
Answers
When a volleyball is tossed over a net, starting from a height of 1.5 meters above the ground, where after reaching the top of its trajectory it returns to its original height as it falls, the ball's speed is the same as when it was tossed, but its velocity is different.
As ball 1 gets to the top of its trajectory, its velocity becomes zero.
since not stated otherwise, we assume that both balls have the same properties
If ball 2 is released at this instance, then they both will travel down at the same time interval and have initial velocity as zero.
since vertical travel is downwards, then acceleration due to gravity g is positive for both balls.
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Calculate the specific heat of a metal from the following data. A container made of the metal has a mass of 3.7 kg and contains 16 kg of water. A 2.3 kg piece of the metal initially at a temperature of 179°C is dropped into the water. The container and water initially have a temperature of 16.0°C, and the final temperature of the entire system is 18.0°C.
Number? Unit?
Answers
The specific heat of the metal is 436 J/kg°C.
A physical quantity called specific heat is used to determine the amount of heat required to raise the temperature of a substance. This is also referred to as the thermal capacity of the material. As a result, the specific heat of a material is defined as the quantity of heat required to increase the temperature of one gram of the substance by one degree Celsius or Kelvin.
The metal's specific heat, based on the given data, can be calculated using the following formula:
Q = m × c × ΔT where, Q = quantity of heat transferred, m = mass of the material, c = specific heat of the material, ΔT = change in temperature. To find the specific heat of the metal, we'll use the mass of the metal, the specific heat of water, and the change in temperature between the metal and the water. The quantity of heat transferred, Q, is equal to the amount of heat absorbed by the water and the metal. As a result, the quantity of heat transferred is equal to:
(16 kg of water × 4186 J/kg°C × 2°C) + (3.7 kg of container × c metal × 2°C) + (2.3 kg of metal × c metal × (18°C - 179°C)) = 0
Solving for c metal gives us the following:
c metal = 436 J/kg°C
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a 3) How far will 20 N of force stretch a spring with a spring constant of 140 N/m?
Answers
Answer:
I think the answer is
Explanation:
140N/m/20N =
7m is the answer
Answer:
140n/20n
=7N
Explanation:
you will divide 140 by 20
Answer all questions in the spaces provided. Kalpana finds a small stone. To help her identify the type of stone, Kalpana decides to find its density. Kalpana explains why she thinks this will help. Her friend Diana disagrees. Below are their explanations. Kaplana The density will be the same, whatever the size of the stone, as long as the type of rock is the same. Bigger stones will have a higher density because they are heavier. Diana (a) Whom do you think gave the correct explanation? Give a reason. (2 marks) ******
Answers
I believe Kalpana gave the correct explanation.
The reason is that density is a property of a material that remains the same regardless of the size of the sample. Density is defined as mass divided by volume (density = mass/volume), and it is a characteristic property of a particular type of rock.
Bigger stones will indeed be heavier, but their volume will also increase proportionally, maintaining the same density value. So, the density will be the same for any size of the stone, as long as the type of rock is the same.
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A Physical Education (gym) class is playing a game of soccer. During the game, the ball experiences a net force of 0 newtons. Which statement explains what is most likely happening with the ball?
A. It is sitting still.
B. It is bouncing off someone’s knee.
C. It has been kicked across the field.
D. It has been tossed straight up into the air.
Answers
When, During the game, the ball experiences a net force of 0 newtons. It is sitting still is the statement explains what is most likely happening with the ball.
What is Net force ?The vector sum of the various or single forces exerted on a particle or object is termed as the net force. The original force's affect on the motion of the particle the force is exerted is replaced by the net force, which is a single force.
Newton:As per the International System of Units, the unit of force is the newton. The force that causes a mass of one kilogram to accelerate by one metre per second is what we call as 1 kgm/s2. It bears Isaac Newton's name in honor of his major contributions to classical mechanics, particularly Newton's second rule of motion.To know more about net force visit
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How many kgs are in 1000N?
Answers
Answer:
this much I think 101.9716212978
Answer:
approximately 102kg
Explanation:
1 kg on the surface of the Earth weighs 9.80665 N
1000 N = 1000/9.80665 kg = 102 kg
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Q: Why are distances in space often measured in light years?
A) The light year is a commonly used unit of measurement
B) Distances in space are so great that a large unit is needed
C) Scientists like to use measurements to confuse people
D) Light years are easy to measure and understan
Answers
B) Distances in space are so great that a large unit is needed
c) The height of a mountain is 1360m. The barometer reading at the base of the mountain is 74cmHg. Given that the densities of mercury and air are 13,600Kgm and 1.25Kgm respectively, determine (3mks) the barometer reading at the top of the mountain.
Answers
The barometer reading at the top of the mountain is 98,737.6 Pa.
What is the barometer reading at the top of the mountain?The barometer reading at the top of the mountain is calculated as follows;
Atmospheric pressure at base = ρgh
= 1.25 kg/m³ x 9.81 m/s² x 0.74 m
= 9.1 Pa
Pressure due to mercury column at base;
= 13,600 kg/m³ x 9.81 m/s² x 0.74 m
= 98,727.8 Pa
Total pressure at base = Atmospheric pressure + Pressure due to mercury column
= 9.1 Pa + 98,727.8 Pa
= 98,736.8 Pa
The total pressure at the top of the mountain can be calculated as follows;
Total pressure at top = Pressure due to mercury column + ρgh
98,736.8 Pa = 101,325 Pa + 1.25 kg/m³ x 9.81 m/s² x h
98,736.8 Pa = 101,325 Pa + 12.263h
12.263h = -2,588.2
h = -211 m
Barometer reading at top;
= 101,325 Pa + 1.25 kg/m³ x 9.81 m/s² x (-211 m)
= 98,737.6 Pa
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A couple took a small airplane for a quick flight up to the wine country for a romantic dinner and then returned home. The plane flew a total of 5 hours and each way the trip was 300 miles. If the plane was flying at 125 mph, what was the speed of the wind that affected the plane?.
Answers
A couple took a small airplane for a quick flight up to the wine country for a romantic dinner and then returned home. The plane flew a total of 5 hours and each way the trip was 300 miles. If the plane was flying at 125mph, the speed of the wind that affected the plane is 25mph.
Given that, speed of airplane Vₐ= 125 mph
speed of wind V = ?
Speed of wind moving against wind is Vₐ- V
Speed of wind moving along wind is Vₐ+ V
Time taken to fly against wind is 300/( Vₐ- V)
Time taken to fly along wind is 300/( Vₐ+ V)
Total time taken to fly both ways = 5 hours
We know, time = distance/velocity
So,
300/( Vₐ- V) + 300/( Vₐ+ V) = 5
300(Vₐ- V+Vₐ+ V)/(Vₐ²-V²) = 5
600Vₐ/5 = Vₐ²-V²
120Vₐ - Vₐ² = -V²
120*125-125*125 = -V²
V²= 625
V = 25 mph
Thus, speed of the wind is 25 mph.
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A wooden cube with the mass of 1kg is placed on a frictionless plane that makes an angle of 30° with the floor.
Calculate
a) The force that causes the cube to slide on the plane
b) The acceleration of the cube
c) The normal force on the cube
g is 10.
Answers
Answer:
I dont know
Explanation:
State the law of conservation of machine
Answers
Answer:
law of conservation of energy is that a perpetual motion machine of the first kind cannot exist, that is to say, no system without an external energy supply can deliver an unlimited amount of energy to its surroundings
Explanation:
Hope it helps.
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True OR False
In a physical change the matter changes.
Answers
the right answer of the question is true
Match the phrase with its explanation
Answers
Answer:
its very easy
Explanation:
A long time ago, many scientists believed that different laws governed motion on earth and motion in space
("celestial motion"). Isaac Newton showed that the same laws govern motion in both realms. This
example would best fit which theory of explanation? Causal Unificationist Deductive O Inductive
Answers
The example provided, where Isaac Newton showed that the same laws govern motion in both realms of Earth and space, best fits the theory of explanation known as Causal Unifications'.
Causal Unifications theory aims to explain phenomena by identifying common causes or underlying principles that apply to seemingly distinct phenomena. In this case, Newton's discovery of the laws of motion demonstrated that the same fundamental principles govern both celestial and earthly motion.
To summarize, the example of Isaac Newton demonstrating that the same laws govern motion on Earth and in space aligns with the Causal Unificationist theory of explanation, which seeks to identify common causes or underlying principles that apply to seemingly distinct phenomena. By discovering the laws of motion, Newton provided a unified explanation for motion in both realms, challenging the previous belief in separate laws for celestial and earthly motion.
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A 0.050 kg toy truck moving right at 0.20 m/s collides with a toy race car weighing 0.015 kg initially at rest, on a frictionless track. The truck keeps moving right at 0.15 m/s after the collision. What is the final speed of the toy race car?
(Consider rightward as the positive direction)
Answers
0.05*0.2=0.05*0.15+0.015*m2',
m2'=1/6 m/s,
m2'=0.17 m/s
N I C E - D A Y!
Math Practice: Cart A loaded with blocks (600g) moving left at 0.7m/s hits stationary cart B (200g).
After the collision, both carts move left, Cart A at speed 0.27m/s.
What is the velocity of cart B after the collision? Show your work.
Answers
Answer:
The velocity of cart B after the collision is 1.29 m/s.
Explanation:
We can find the velocity of cart B by conservation of linear momentum:
\( p_{i} = p_{f} \)
\( m_{A}v_{A_{i}} + m_{B}v_{B_{i}} = m_{A}v_{A_{f}} + m_{B}v_{B_{f}} \)
Where:
\(m_{A}\) is the mass of cart A = 600 g = 0.6 kg
\(m_{B}\) is the mass of cart B = 200 g = 0.2 kg
\(v_{A_{i}}\) is the inital velocity of cart A = 0.7 m/s
\(v_{A_{f}}\) is the final velocity of cart A = 0.27 m/s
\(v_{B_{i}}\) is the initial velocity of cart B = 0
\(v_{B_{f}}\) is the final velocity of cart B =?
Taking the left direction as the positive horizontal direction:
\( 0.6 kg*0.7 m/s + 0 = 0.6 kg*0.27 m/s + 0.2 kg*v_{B_{f}} \)
\( v_{B_{f}} = 1.29 m/s \)
Therefore, the velocity of cart B after the collision is 1.29 m/s.
I hope it helps you!
The steps of a flight of stairs are 21.0 cm high (vertically). If a 63.0-kg person stands with both feet on the same step, what is the gravitational potential energy of this person on the first step of the flight of stairs relative to the same person standing at the bottom of the stairs? If a 63.0-kg person stands with both feet on the same step, what is the gravitational potential energy of this person on the second step of the flight of stairs relative to the same person standing at the bottom of the stairs? If a 63.0-kg person stands with both feet on the same step, what is the gravitational potential energy of this person on the third step of the flight of stairs relative to the same person standing at the bottom of the stairs? What is the change in energy as the person descends from step 7 to step 3?
Answers
The gravitational potential energy of an object is given by the formula:
U = mgh
where U is the gravitational potential energy, m is the mass of the object, g is the acceleration due to gravity\((9.81 m/s^2),\) and h is the height of the object above some reference point.
In this problem, the reference point is taken to be the bottom of the stairs. Therefore, the gravitational potential energy of the person on a particular step relative to standing at the bottom of the stairs is given by:
U = mgΔh
where Δh is the height of the step above the bottom of the stairs.
Using this formula, we can calculate the gravitational potential energy of the person on each step as follows:
Gravitational potential energy of the person on the first step relative to standing at the bottom of the stairs =\((63.0 kg)(9.81 m/s^2)(0.21 m)\)= 131.67 JGravitational potential energy of the person on the second step relative to standing at the bottom of the stairs = \((63.0 kg)(9.81 m/s^2)(0.42 m) = 263.34 J\)Gravitational potential energy of the person on the third step relative to standing at the bottom of the stairs = (63.0 kg)(9.81 \(m/s^2)(0.63 m) = 395.01 J\)To calculate the change in energy as the person descends from step 7 to step 3, we need to calculate the gravitational potential energy on each of those steps and take the difference. Using the same formula as above, we get:
Gravitational potential energy of the person on step 7 relative to standing at the bottom of the stairs =\((63.0 kg)(9.81 m/s^2)(1.47 m) = 913.51 J\)Gravitational potential energy of the person on step 3 relative to standing at the bottom of the stairs = \((63.0 kg)(9.81 m/s^2)(0.63 m) = 395.01 J\)Therefore, the change in energy as the person descends from step 7 to step 3 is:
ΔU = U3 - U7 = 395.01 J - 913.51 J = -526.68 J
The negative sign indicates that the person loses potential energy as they descend from step 7 to step 3.
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The diagram shows a motion map for a train.
Three individual dots on the right of the diagram show that the train stopped for 3 seconds.
Which statement is supported by the motion map?
The train traveled south and then north.
The train moved at a velocity of 75 mph north.
The train had a greater velocity when it moved away from the origin.
The train stopped for 3 seconds.
Answers
The last option is correct i.e. the train stopped for 3 second.
The train's motion is depicted on the motion map. The train's path is indicated by the horizontal direction, its motion is indicated by the arrows (the length of an arrow indicates how far the train travels in one second), and each black dot represents one second in time. By taking into account this information, we can more accurately describe the train's motion, The train travels for three seconds away from the starting point.For three seconds, the train stopped (this corresponds to the 3 vertical dots)For two seconds, the train goes in the direction of the starting point.Looking at the many choices, we can see that only the final choice is the train may be the right one.
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Answer:
The last option is correct i.e. the train stopped for 3 second.
Explanation:
8. A solution contains a mixture of two volatile substances A and B.
The mole fraction of substance A is 0. 35. At 32°C the vapor pressure
of pure A is 87 mmHg, and the vapor pressure of pure B is 122
mmHg. What is the total vapor pressure of the solution at this
temperature?
a) 110 mmHg
b) 209 mmHg
c) 99. 3 mmHg
d) 73. 2 mmHg
Answers
The total vapour pressure of a solution is 110mmHg which is calculated using Raoult's law. The mole fraction of substance A is given as 0.35, and the vapour pressures of pure A and B are given as 87 mmHg and 122 mmHg.
According to Raoult's law, the partial pressure of a component in a solution is proportional to its mole fraction. The mole fraction of substance A is 0.35, which means that it constitutes 35% of the solution. Therefore, the contribution of substance A to the total vapour pressure is 0.35 times its vapour pressure, which is 0.35 * 87 mmHg = 30.45 mmHg.
Similarly, the contribution of substance B can be calculated as 0.65 times its vapour pressure, which is 0.65 * 122 mmHg = 79.3 mmHg.
To find the total vapour pressure, we add the partial pressures of A and B: 30.45 mmHg + 79.3 mmHg = 109.75 mmHg.
Rounding this value to the nearest whole number, we get 110 mmHg. Therefore, the correct answer is option a) 110 mmHg.
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when the radius of a circular phase space plot changes, what does this mean? a. momentum is conserved. b. momentum is not conserved. c. energy is not conserved. d. energy is conserved.
Answers
Answer is b, momentum is not conserved.
Explanation:
L = r × p
So when the radius of a circular phase space plot changes, the Momentum is not conserved because farther the mass is from the center of rotation, the larger the angular momentum.
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Choose the appropriate descriptor for the term meter.
A. mass
B. area
C. length
D. volume
Answers
Answer:
It's C. Length
Explanation:
Just think of a ruler. Hope I helped! :)
The term "meter" is the name chosen for the SI standard unit of length and distance. (C)
The SI standard unit of mass is called the "kilogram".
The unit of area is the square-meter or meter².
The unit of volume is the cubic meter or meter³.
How are velocity and force similar?
Answers
Answer: Force
In physical science, a force is something that acts on an object by pushing or pulling it. If the force is strong enough, it changes the position or shape of the object. Forces such as friction, air resistance and simple physical contact touch the object directly, while forces like gravity, magnetism and electrostatics act on the object from a distance. Force is a vector quantity, meaning you can measure both its strength and its direction. The formula to find the measure of a force is force = mass times acceleration, written as f = ma.
Velocity
The faster something is moving, the higher its velocity.
When an object is moving, one way to measure how fast it is moving is by finding its velocity, which is the rate at which it is changing position. Like force, velocity is a vector quantity, so it includes direction. To find the average velocity of an object, divide the change in its position by the time the movement took, and state its direction. For example, if a car is driving north and in one hour's time it travels 30 miles, its velocity is 30 miles per hour, north.
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when high voltages are present, a glow may be seen around sharp points, known as
Answers
When high voltages are present, a glow may be seen around sharp points, known as corona discharge.
This glow is caused by the ionization of the air molecules near the sharp point due to the electric field strength. The ionized air molecules emit light, creating a visible glow. The intensity and color of the glow depend on the voltage level and the gas composition of the surrounding environment.
Corona discharge is a phenomenon that occurs when high voltages are applied to a conductor, especially in the presence of a sharp point or a high electric field. It results in the ionization and excitation of the surrounding air molecules, creating a glowing or visible aura of light around the conductor. The ionized air can also produce a hissing or crackling sound. Corona discharge is often observed in high-voltage power lines, antennas, and other high-voltage equipment. It is important to note that corona discharge can cause power loss and interfere with the proper functioning of electrical systems, so efforts are made to minimize its occurrence in high-voltage applications.
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The specific heat capacity of aluminium block is 9130 per kg per °C and its
temperature is increased by 10 °C. 4565 J of energy is transferred. Calculate the
mass of the aluminium block.
Answers
Answer:
Q
Explanation: you don't need to convert °°C to K Temperature difference is the same on both scales
4.) A boat heading north crosses a wide river at a velocity of 2.778 m/s. The river current pushes the boat east at a constant velocity of 1.389 m/s. Find the resultant velocity. a.) 3.11 m/s b.) 9.65 m/s c.) 0.78 m/s d.) 6.38 m/s
Answers
Answer:
Resultant velocity = 3.11 m/s.
Explanation:
It is given that,
The velocity of a boat is 2.778 m/s due North
The velocuity of river is 1.389 m/s due east.
We need to find the resultant velocity. The angle between these two velocities is 90 degrees. The resultant is given by :
\(v=\sqrt{v_b^2+v_r^2} \\\\v=\sqrt{2.778 ^2+1.389 ^2} \\\\v=3.11\ m/s\)
So, the correct option is (a).
How far has a dolphin traveled in kilometers if it swims for 1.8 h at 5.6 km/h ?
Answers
Answer:
distance = 6.26342 miles
Explanation:
which parameter is multiplied by your mass to calculate your weight on another planet?
Answers
The acceleration due to gravity on another planet is multiplied by your mass to calculate your weight on that planet. The acceleration due to gravity is different on each planet, so your weight will also be different. For example, the acceleration due to gravity on Earth is 9.8 m/s², while the acceleration due to gravity on Mars is 3.711 m/s². This means that if you weigh 100 pounds on Earth, you would weigh only 37.11 pounds on Mars.
The formula for calculating your weight on another planet is:
Weight = Mass * Acceleration due to gravity
For example, if you weigh 100 pounds on Earth and you want to calculate your weight on Mars, you would use the following formula:
Weight on Mars = 100 pounds * 3.711 m/s²
Weight on Mars = 371.1 pounds
Therefore, your weight on Mars would be 371.1 pounds.
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a potter’s wheel moves from rest to an angular speed of 0.30 rev/s in 31.0 s. assuming constant angular acceleration, what is its angular acceleration in rad/s2 ? answer in units of rad/s 2 .
Answers
Angular speed = 0.30 rev/s,
Time taken = 31 s.
Since the angular acceleration of the potter's wheel is constant, we can use the following kinematic equation to find it,
ω = ω₀ + αt
where
ω is the final angular speed
ω₀ is the initial angular speed
α is the angular acceleration
t is the time taken
Substituting the values,
0.30 rev/s = 0 + α × 31 s
Converting rev/s to rad/s,
0.30 rev/s × (2π rad/rev) = 0.30 × 2π rad/s
= 1.88 rad/s
So, the equation becomes,
1.88 rad/s = α × 31 s
Dividing both sides by 31 s,
α = 1.88 rad/s ÷ 31 s
= 0.061 rad/s²
Therefore, the angular acceleration of the potter's wheel is 0.061 rad/s² (rounded to three significant figures).
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