This magnet may be divided in half to create two separate magnets, each featuring their own arrays of northern and southern magnetic poles. This is due to the absence of magnetic monopoles in nature.
What is magnet, exactly?Any substance that can draw iron and create a magnetic field around itself is a magnet. All known elements and several compounds had been investigated for magnetism by the end of 19th century, and it was discovered that every one of them has some sort of magnetic characteristic.
This demonstrates that magnetic monopoles cannot be created from a bar magnet. It is impossible for a bar to be split in two in order that one half possesses the magnetic north pole and the other the magnetic south pole. Instead, the east and west poles of each magnet will be unique.
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1.60 the kinematic viscosity and specific gravity of a liquid are and 0.79, respectively. what is the dynamic viscosity of the liquid in si units? 1.61 a liquid has
The dynamic viscosity of the liquid is 0.277Ns if the kinematic viscosity and specific gravity of a liquid are and 0.79, respectively.
Given the kinematic viscosity of a liquid = 3.5 x 10^-4 m^2/s
The specific gravity of a liquid = 0.79
A conversion between kinematic and dynamic viscosity measurements can be made using density.
We know that, Specific gravity = density of liquid/density of water
The density of water = 1000kg/m^3
The density of liquid = 0.79 x 1000 = 790kg/m^3
Kinematic viscosity x liquid density = dynamic viscosity.
Dynamic viscosity = 3.5 x 10^-4 x 790 = 0.2765Ns
Hence the required dynamic viscosity of the liquid is 0.277Ns.
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complete question: The kinematic viscosity and specific gravity of a liquid are 3.5 x 10^-4 m^2/s and 0.79, respectively. What is the dynamic viscosity of the liquid in SI units?
Three blocks are connected with each other by two light strings. The blocks have different masses m2 m3m1 The heaviest of the three blocks is placed on a frictionless table The system of three blocks is released from rest. What is the acceleration of block ma? A) (m2-ms- moim mama) B) (mums - m2)/(m mama) C) (ma-mulo/my.me .mg) D) (ma-ma-mulo/im.mpma) E) ( mma)/(m. mama)
The acceleration of block m1 is (ma-ma-mulo/im.mpma).
What is acceleration?Acceleration is the rate at which an object's velocity with respect to time changes. It is a vector quantity to accelerate (in that they have magnitude and direction). The direction of the net force acting on an object determines the direction of its acceleration.
How to determine the acceleration of block m1?The acceleration of block m1 (ma) can be determined by analyzing the net force acting on it, which is equal to the tension in the string connected to it, minus the weight of the block.
Tension in the string connected to m1 is equal to the tension in the string connected to m3, since the two strings are light and inelastic. Therefore, the net force acting on m1 is equal to T - m1g, where T is the tension in the string and g is the acceleration due to gravity.
The tension in the string is equal to the acceleration of m3, since
T = m3a. Therefore, the net force acting on m1 is equal to m3a - m1g.
m1 is connected to m2 and m3, so the acceleration of m1 is dependent on the masses of m1, m2 and m3.
Therefore, the acceleration of block m1 is (m3-m1-m2)/(m1+m2+m3) which corresponds to option D) (ma-ma-mulo/im.mpma).
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in newton's second law, f = ma, the mass m is a gravitational mass.T/F
In Newton's second law, f = ma, the mass m is a gravitational mass is a true statement.
Newton's second law of motion states that the acceleration of an object is directly proportional to the net force applied to it and inversely proportional to its mass. In equation form this can be written as F = ma,
where,
F is the net force applied
m is the mass of the object
a is the acceleration of the object
This law explains that the larger the force applied, the greater the acceleration of the object.
Also, the larger the mass of the object, the lower the acceleration when the same force is applied to the object.
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an object tends to rotate (spin) if it is pushed on by a force that is not aimed at the center of mass. how do athletes use this fact to initiate spins before they fly through the air, as in gymnastics, skating, and diving events?
Athletes use this fact to initiate spins by applying a force to the edge of their body, such as their hands or feet, which is not aimed at the center of mass.
This causes their body to rotate rapidly and spin around, giving them the momentum to fly through the air.
Gymnasts use this technique to spin around the high bar or the floor, figure skaters and ice dancers use it to spin around the ice, and divers use it to spin around the diving board before they enter the water.
What is force?
Force is an influence that causes an object to change its velocity or shape.
It can be a push or a pull, and it can be applied by an object, a person, or even gravity.
Force is measured in terms of mass and acceleration, and it is usually expressed in units of Newtons (N).
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. (a) how fast must a 3000-kg elephant move to have the same kinetic energy as a 65.0-kg sprinter running at 10.0 m/s? (b) discuss how the larger energies needed for the movement of larger animals would relate to metabolic rates.
(a) We can find the kinetic energy of the sprinter by:
KE = 1/2 * 65.0 kg * (10.0 m/s)^2 = 3250 J
Then, we can use this same equation to find the speed of the elephant, but with its mass (3000 kg):
KE = 1/2 * 3000 kg * v^2 = 3250 J
Solving for v, we get: v = sqrt(3250 J / (1/2 * 3000 kg))
And the speed of the elephant would be around 4.19 m/s.
(b) In order for a larger animal to move, it requires more energy than a smaller animal because larger animals have more mass, and as a result, more energy is needed to accelerate and maintain their motion. This increased energy demand is met by an increase in the animal's metabolic rate.
How powerful is an elephant?In strength, elephants are the strongest mammals and the strongest land animals. African elephants can weigh up to 6,350kg and they can carry up to 9,000kg, the weight of 130 adult humans.
What do you mean by kinetic energy?Kinetic energy is a form of energy that an object or a particle has due to its motion. If work is done on an object by applying a net force, the object speeds up and thereby gains kinetic energy.
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) while driving down the road, a firefly strikes the windshield of a bus and makes a quite obvious mess in front of the face of the driver. this is a clear example of an action-reaction pair. the firefly hits the bus and the bus hits the firefly. which of the two forces is greater: the force on the firefly or the force on the bus? (be careful)
The force on the firefly is greater than the force on the bus.
The concept of action-reaction pair is described by Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. In this scenario, the force of the firefly striking the bus is the action and the force of the bus striking the firefly is the reaction.
However, the force on the firefly is greater than the force on the bus. This is because the firefly is much smaller and less massive than the bus, so the force required to stop the firefly is much greater than the force required to stop the bus. Additionally, the firefly's impact on the bus would be negligible, while the bus' impact on the firefly would be fatal.
The forces acting on two objects in an action-reaction pair are equal in magnitude but opposite in direction, but the effect of these forces on the objects can be different based on the mass and velocity of the objects.
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For some resistor applications, it is important to maintain a fixed value of resistance over a range of operating temperatures. Explain briefly how you could minimize variations (resulting from changes in temperature) in the resistivity of Si at temperatures near 300K. Assume that you are free to choose the value of resistivity.
The value of resistivity and conductivity are mentioned below.
What is resistivity ?
A conductor with a unit cross-sectional area and unit length and its electrical resistance. Resistivity, a distinctive quality of any material, is helpful in comparing different materials based on their capacity to conduct electric currents. Poor conductors are identified by high resistance.
What is conductivity ?
A substance or material that permits electricity to flow through it is referred to as an electrical conductor. When voltage is given to a conductor, electrical charge carriers, often electrons or ions, travel easily from atom to atom.
Part a is explained by using the concept of diffusion current density and Einstein's relation
from semiconductor we have
T mobility
V= μE
Drift velocity
I = ncAvl
J also equal to E
σE= nevd
σ= nevd/E
σ= neμ
resistivity is reciprocal of conductivity
S= 1/σ=1/neμ
from Einstein's equation
∫= KT/ ne²Dn
Therefore, value of resistivity and conductivity are mentioned below.
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a 0.5 kg block has an acceleration of 0.2 m/s^2 when a force is exerted on it. a second block has an acceleration of 0.1 m/s^2 when given the same force. what is the mass of the second block?
The second block weighs one kilogram.
What is mass?A mass measurement reveals how much matter is there in an object.
Usually, the metric systems of grams, kilograms, and tonnes are used to compute it.
How do you determine it?As we know that F = ma.
Considering that the force applied to the first block and the second block are equal.
The acceleration of the first block is 0.2 m/s^2 and the acceleration of the second block is 0.1 m/s^2, we can set up the following equation:
F = ma
where F is the force exerted on both blocks, m1 is the mass of the first block (0.5 kg), a1 is the acceleration of the first block (0.2 m/s^2), m2 is the mass of the second block, and a2 is the acceleration of the second block (0.1 m/s^2).
So substituting,
F = m1 * a1 = m2 * a2
Rearranging for m2
m2 = F / a2
m2 = (F / 0.1 m/s^2)
m2 = (F/0.1) = m1 * (a1/a2)
m2 = (0.5kg * (0.2/0.1)) = 1kg
So, the mass of the second block is 1 kg.
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9. Show that the equation for the gravitational potential energy E
GMm is dimensionally
R
correct given that the units for the gravitational constant G are N.m².kg2, M and m are masses of
interacting objects and R is their separation distance.
- is dimensionally homogeneous.
G is the gravitational constant, M is the mass of the gravitating body, and r is the separation between their centers.
What does R stand for in the gravitational potential energy formula?The gravitational potential energy of mass m can be expressed generally as follows: where G is the gravitational constant, M is the mass of the gravitating body, and r is the separation between their centers.G.P.E can also be written as [M1 L0 T0] [M0 L1 T-2] [M0 L1 T0] = [M1 L2 T-2]. As a result, the dimensional representation of gravitational potential energy is [M1 L2 T-2].For potential energy close to the Earth's surface, a negative potential energy is consistent with mgh. The potential energy change for lifting an object h feet above the ground is given by: U = Uf - Ui = -GmM/(R+h) - (-GmM/R). when h is less than R in size.To learn more about gravitational potential energy refer to:
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Please help me solve this.
Use significant figures please.
Answer:
the photo is not loading ok this is your photo open this and see now
happy
Answer these please and explain. (100 points)
1.A piece of candy dropped from a tall building has gained a velocity of 52.6 m/s. how long has the candy been falling with an acceleration of 9.8m/s2?
2.An object traveling 200m/s slows down to 50 m/s in 5 seconds. calculate the acceleration of the object
3.a runner is accelerating at a rate of 30 m/s2 How fast will he be going 5 seconds after he starts?
Answer:
Explanation:
1.) V = V₀ + at
52.6 m/s = 0 + (9.8 m/s²)t
t = (52.6 m/s)/(9.8 m/s²) = 5.37 s
2.) a = ΔV/Δt = (50 m/s - 200 m/s) / 5 s = -30 m/s²
3.) V = V₀ + at
V = 0 + (30 m/s²)(5 s) = 150 m/s
This assumes he starts from rest. Also, no human can run 150 m/s. Are you sure the given a is 30 m/s²? You may want to double check.
The ball is round on a string at 35° with respect to the vertical. if the length of the string is 12cm. how fast must be the ball is spinning?
Given that T=ma and a= v^2/r, we can solve for the velocity, v = √(Tr/m)
how to solve this problem?To solve this problem, we need to use the concept of centripetal force, which is the force that keeps an object moving in a circular path. The centripetal force is given by the equation:
F = m * a
where F is the centripetal force, m is the mass of the object and a is the centripetal acceleration.
The centripetal acceleration is given by the equation:
a = v^2 / r
where v is the velocity of the object and r is the radius of the circular path.
The radius of the circular path in this case is the length of the string (12cm). The angle of 35° is not needed for solving the problem.
Now we can substitute the value of a into the equation for the centripetal force:
F = m * (v^2 / r)
We know the force is the tension of the string, T, and the mass of the object, m. So we can write
T = m * (v^2 / r)
Given that T=ma and a= v^2/r, we can solve for the velocity, v = √(Tr/m)
Without knowing the mass of the object and the tension of the string we can't find the velocity of the spinning ball.
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the small block shown in the figure above was released from rest at point o and slid down the track such that friction was considered to be negligible. the block reached point p with speed v1. between points o and p, what kind of work did the track do on the block, and why?
At point O, the little block in the previous diagram was set free from its state of rest and allowed to slide along the track with minimal friction.
What method may a learner use to calculate the total power of the chunk earth system from the graph?How might a pupil interpret the graph to calculate the system's overall energy Use 12 mv2f where m=2 kg and vf=the object's final velocity as determined from the graph. An object of mass m can travel in any dimension in the xy plane without encountering any resistance when it is initially at rest.
When a youngster uses a swing, what kind of energy transformation takes place?Potential energy is transformed into kinetic energy by swings,then repeatedly changing from potential energy to kinetic energy. The fast component of swinging is called kinetic energy, and it is the speed at which you run back and forth. The most powerful aspect of swinging is potential energy.
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he centers of a 12 kg lead ball and a 70 g lead ball are separated by 14 cm. part a part complete what gravitational force does each exert on the other? express your answer using two significant figures. f
5.6 * 10⁻⁷N gravitational force will exert on both lead balls.
Given information:
mass of 1st ball(m₁) = 12kg
mass of 2nd ball (m₂) = 70g
distance between both balls (r)= 14cm
To find gravitational force
F = Gm₁m₂/r²
= 5.6 N
The force of attraction between any two bodies is directly proportional to the product of their millions and is equally proportional to the forecourt of the distance between them.
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A student is twirling a rubber stopper in a vertical circle of radius 0.95 m. If the rubber stopper has a mass of 50 grams and the student is able to control the speed so that it is a constant 3.5 m/s at all points on the circle:
If the rubber stopper has a mass of 50 grams and the student is able to control the speed so that it is a constant 3.5 m/s at all points on the circle, then he will use the string half as the length of the original string.
A student is twirling a rubber stopper in a vertical circle of radius 0.95 m. If the rubber stopper has a mass of 50 grams and the student is able to control the speed so that it is a constant 3.5 m/s at all points on the circle. A physics student is performing a lab in which she twirls a rubber stopper at the end of a string around in a circle at nearly constant speed and tries to determine its acceleration. by the given primary information we can firmly conclude that if the rubber stopper has a mass of 50 grams and the student is able to control the speed so that it is a constant 3.5 m/s at all points on the circle, then he will use the string half as the length of the original string.
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A sample of an unknown material weighs 290 N in air and 190N when immersed in alcohol of specific gravity 0.700.
(a) What is the volume of the material?
m3
(b) What is the density of the material?
kg/m3
The volume of the material is 27.14 m³ and the density of the material is 1.02 kg/m³.
The sample of the unknown material as a weight of 290 Newton in the air and when it is must in alcohol of specific gravity 0.70 it has a weight of 190 Newton.
We know,
B = VpG
B is buoyancy that will be 190N,
V is volume of material,
p is the density of alcohol,
G is the acceleration due to gravity,
Putting values,
190 = V(0.7)(10)
V = 27.14 m³
The volume of the material is 27.14 m³.
Now, we know,
Density = Mass/volume
Density = W/Vg
Putting values,
Density = 290/27.14×10
Density = 1.02 kg/m³.
So, the density of material is 1.02 kg/m³.
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Consider the case when the constant A=3 and the time constant =4. Plot the graph of y=3e^(-t/4). Make it a position versus time graph.
The graph of y=3e^(-t/4) is shown below: Position (y) on the vertical axis and time (t) on the horizontal axis.
What is horizontal axis?The horizontal axis is a reference line on a graph that runs horizontally (left to right) and is used to plot data points. It is also known as the x-axis, and it typically represents the independent variables of a graph. The horizontal axis is used to visually display quantitative values, such as time, distance, or cost. When graphing a mathematical equation, the horizontal axis typically shows the real numbers that are being used in the equation.
The graph starts at y=3 when t=0 and then decreases in a curved line as time increases. This is because the exponent term is negative, so the entire function is decreasing as time increases. Specifically, the graph follows the shape of the exponential decay function e^(-t/4). As time increases, the value of y decreases exponentially, approaching 0 as t approaches infinity.
The formula for the graph is y = 3e^(-t/4)
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Please help thank you so much!!
Answer: A
Explanation: This is a condition that makes it hard for the body to obsorve oxygen.
Answer:
it's A
Explanation:
i just did the same thing
If a room has dimensions of 350m and width of 200m, calculate the number of square tiles of length 5m would be needed to tile the entire room
The number of the square tiles that would be needed to tile the entire room is 2,800 tiles.
What is the area of the room?
The area of the room is calculated by applying the following formula as shown below.
Mathematically, the formula for area of a rectangular room is given as;
A = L x B
where;
L is the length of the rectangular roomB is the breadth of the rectangular roomArea = 350 m x 200 m
Area = 70,000 m²
The area of the square tiles is calculated as follows;
A = L x L
where;
L is the length of the square tileA = 5 m x 5 m
A = 25 m²
The number of the square tiles that would be needed to tile the entire room is calculated as follows;
n = area of the entire room / area of each square tile
n = ( 70,000 m² ) / ( 25 m² )
n = 2,800
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Compound 1 has a composition of 46.7 mass% of element A and 53.3 mass% of element B. A and B also form a second binary compound 2 with 30.4mass% of A and 69.6 mass% of B. Show that the data are consistent with the law of multiple proportions.
The data are consistent with the law of multiple proportions, as the ratios of element A to element B in each compound can be reduced to small whole numbers.
The law of multiple proportions states that when two elements combine to form two or more compounds, the masses of one element that combine with a fixed mass of the other element are in a ratio of small whole numbers. For compound 1, the mass of element A is 46.7 mass%, and the mass of element B is 53.3 mass%. For compound 2, the mass of element A is 30.4 mass%, and the mass of element B is 69.6 mass%.
The ratio of element A in compound 1 to element A in compound 2 is 46.7/30.4 = 1.54. The ratio of element B in compound 1 to element B in compound 2 is 53.3/69.6 = 0.764. The ratio of element A in compound 1 to element B in compound 1 is 46.7/53.3 = 0.875. The ratio of element A in compound 2 to element B in compound 2 is 30.4/69.6 = 0.436. These ratios can be simplified to 3:2:2:1, which are small whole numbers and therefore consistent with the law of multiple proportions.
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a bungee jumper of mass 60 kg steps off a 40-m high cliff. it takes approximately 40 n to stretch the cord 1 meter. how close does the jumper get to the ground?
Assuming the bungee cord is perfectly elastic, the jumper will reach a minimum distance of 14.7 meters from the ground after the cord has stretched.
What is distance?
Distance is the amount of space between two objects or points. It is typically measured in units such as meters, feet, or miles. Distance can also be measured in a more abstract sense, such as the amount of time it takes for something to happen or the amount of effort required to complete a task.
Distance can also refer to the difference between two things, such as the difference between two people’s opinions on a particular topic. Distance can also refer to physical separation, such as the distance between two people who are in different countries or cities. Distance can also be used to express the size of something, such as how far a car can travel on a single tank of gas.
Given: m = mass of jumper = 60kg
h = height of cliff = 40m
Also,
k = F/x = 40N/1m = 40N/m
Now, when jumper jumps,
F = m×g
= 60×9.8
= 588 N
Therefore,
x = (588N)/(40N/m) = 14.7m
Thus, jumper gets to a close of 14.7 meters to the ground.
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rutherford created a planetary model for atoms after his experiments. imagine if rutherford's idea that electrons radiate energy while orbiting around a nucleus was true. which other model or scientific idea would have been strengthened by this?
Rutherford's idea that electrons radiate energy while orbiting around a nucleus would have strengthened the idea of quantum mechanics, which explains the behavior of particles at the subatomic level.
what is mechanics ?
Mechanics is a branch of science that studies the behavior of physical objects, their interactions, and the forces that act on them. It is sometimes referred to as the fundamental science, as it provides the underlying principles of many other sciences, such as engineering, aeronautical science, and medicine.
Mechanics is divided into two main branches: classical mechanics and quantum mechanics. Classical mechanics studies the motion of macroscopic objects, such as automobiles and aircraft, and is a cornerstone of engineering and the physical sciences. Quantum mechanics is the study of the behavior of microscopic objects, such as atoms and molecules, and is a cornerstone of modern chemistry and physics.
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How do I find work done by friction over the full length of a roller coaster?
The full length is 0.34 meters(it’s a paper roller coaster but that doesn’t matter) and the mass of the marble is 0.005kg(5g). I can’t seem to find an equation for it?
According to Newton's third rule of motion, whenever a first object applies a force to a second object, the first object feels a force that is both equal to and opposite from the force that it applies.
What is Force?
In physics, a force is an influence that can change the motion of an object. A force can cause a mass object's velocity or acceleration to change. Force can be described intuitively as a push or a pull. Because it has both magnitude and direction, a force is a vector quantity.
To find the work done by friction over the full length of the roller coaster, you will need to calculate the force of friction acting on the marble over the entire track. The force of friction can be calculated using the formula: F = μ * N, where μ is the coefficient of kinetic friction and N is the normal force. Once you have calculated the force of friction, you can then calculate the work done by multiplying the force of friction by the distance travelled. The formula for work is W = F * d, where F is the force of friction and d is the distance travelled.
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A car starts moving from a full stop at a traffic light. The car covers a distance of 75 meters at an acceleration of 012 meters per second squared. What is the magnitude of the final velocity of the car?
Answer:
The final velocity of the car can be calculated using the equation:
v = u + at
where:
v = final velocity
u = initial velocity (since the car starts from a full stop, the initial velocity is 0)
a = acceleration (0.12 m/s^2)
t = time (unknown, but can be calculated using the distance and velocity)
To find the time, we can use the distance and velocity formula:
d = ut + (1/2)at^2
75 = 0 + (1/2)(0.12)(t^2)
t = sqrt(75/(1/2)(0.12))
t = sqrt(625/0.06)
t = sqrt(10416.67)
t = 102.41 seconds
Now we can substitute the values for u, a and t into the first equation to find the final velocity:
v = u + at
v = 0 + (0.12)(102.41)
v = 12.29 m/s
The magnitude of the final velocity of the car is 12.29 m/s.
a 2 uc point charge and a 4 uc point charge are a distance l apart. where should a thurd point charge be placed so that the electrical force on that thurd charge is zero?
This will create a system of three equal-sized point charges, and since the forces between point charges are equal and opposite, the forces on the third charge will cancel each other out and there will be no net force.
What is the charge ?
The charge is the amount of money that a person is asked to pay in exchange for goods or services. Charges can be in the form of a fixed price, a fee based on time spent or a percentage of the total cost. Charges may also be based on the complexity or difficulty of the job. Payment can be in the form of cash, check or credit card. Charges are typically due at the time of service, unless other arrangements have been made in advance.
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a load of 60 j 80 has a current of 4.80 a with a phase angle of 30o, the total power absorbed/supplied by the load is:
P is power, V is voltage, I is current, and θ is the phase angle between the current and voltage. In this case, the voltage across the load is 60V, the current is 4.8A, and the phase angle is 30 degrees.
Calculation-Z= 60+j80
Z = R+ jx
So X = 80
Current I = 4.8 A
Reactive power =(i)2 X
= 4.8x4.8x80= 1843 vars absorbed by load.
What is 3-phase voltage?The three independent wires required for a three-phase connection, on the other hand, are used to transmit electricity. The voltage of a single-phase power supply system can go as high as 230 Volts. However, it can transmit a voltage of up to 415 Volts on a three-phase connection.
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a car speedometer has a 8% uncertainty. what is the range of possible speeds (in km/h) when it reads 25 km/h? (there are two answers. enter the lowest value first and the highest value second. for each answer, enter a number.)
The range of possible speeds (in km/h) at the given uncertainty is 23 km/h to 27 km/h.
What is uncertainty in measurement?
Uncertainty is defined as the range of possible values within which the true value of the measurement lies.
The range of possible speeds (in km/h) when it reads 25 km/h is calculated as follows;
the uncertainty of the speed = ± 8%
The lowest speed reading = ( 100% - 8%) x 25 km/h
= ( 92 % ) x 25 km/h
= 0.92 x 25 km/h = 23 km/h
The highest speed reading = ( 100% + 8%) x 25 km/h
= ( 108 % ) x 25 km/h
= 1.08 x 25 km/h = 27 km/h
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Angela has a bucket of mass 2 kg tied to a string. She places a drinking glass of mass 0.5 kg in the bucket. She spins the bucket in a vertical circle of radius 1.5 m. You want to find out how fast she must swing the bucket to keep the glass from falling out.
a. Draw the free-body diagram for the glass when it is at the top of the circle.
b. What is the equation for the net force on the glass at the top of the circle in terms of w, FN, m, v, and r?
c. The glass will fall out of the bucket if the normal force between the glass and bucket equals zero. How fast must she spin the bucket to prevent this from happening?
d. The string will break if the tension on it is more than 100 N. Over what range of speeds can she keep the glass in the bucket and prevent the string from breaking?
The velocity at which the bucket spins is 4.91m/s and the range of speeds is between 4.91 m/s and 17.3 m/s.
a) The diagram is attached
b) FN - mg = m(v²/r)
c) v = 4.91 m/s
d) (4.91 < v < 17. 3 ) m/s
What is Net Forcea. The free-body diagram for the glass when it is at the top of the circle would show the glass being acted upon by several forces. At the top of the circle, the glass is subjected to its weight (mg) acting downward, the normal force (FN) exerted by the bucket on the glass, and the tension (T) in the string.
b. The net force on the glass at the top of the circle can be represented by the following equation:
FN - mg = m * a
FN - mg = m(v²/r)
where FN is the normal force, m is the mass of the glass, g is the acceleration due to gravity, and a is the acceleration of the glass.
c. To prevent the glass from falling out, the normal force between the glass and the bucket has to be greater than zero, meaning the tension force should be greater than the weight of the glass. So we can use the net force equation.
T = m (v² / r) + mg
T = (0.5 kg)(v² / 1.5 m) + (0.5 kg)(9.8 m/s^2)
T > 0
Solving for v we get:
v > √( 9.8*1.5 ) = 4.91 m/s
d. The tension on the string is given by the equation T = m(v²/r)
Therefore, tension on the string is greater than 100 N when v > √(100*1.5/0.5) = √(300) = 17.3 m/s
Therefore the range of speeds she can keep the glass in the bucket and prevent the string from breaking is between 4.91 m/s and 17.3 m/s.
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A cannon ball is launched horizontally from a cannon. the cannon is on the edge of a 50 m tall cliff. what is the acceleration of the cannon ball horizontally?
a 0
b not enough information
c 50 m/s2
d 9.8 m/s2
Answer:
a
Explanation:
The acceleration of the cannon ball horizontally is 0 m/s2, since it is already traveling at a constant velocity.
a 2 kg block is moving at 3 m/sec. a 4.0 nt force is applied in the direction of motion and is then removed after the object has traveled an additional 5.0 m. the work done by this force is
The work done by this force is 20 J.
Initial velocity Vi = 3m/s
final velocity Vf^2= Vi^2 +2as = 3^2 +2(2)(5) =29
Vf = 5.3m/s
Now we'll find the kinetic energy which is equal to the work done
K.E = m(Vf-Vi)^2/2
K.E = 2×(5.3-3)^2/2
K.E = 20 J
So the work done by this force is 20 J.
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