When a ball is thrown against a wall, the ball exerts a force on the wall, and the wall exerts an equal force in the opposite direction back on the ball. (D)
Answer:
The ball exerts a force on the wall and the wall exerts a force back.
Explanation:
When a ball is thrown against a wall, the ball exerts a force on the wall and the wall exerts a force back. This is due to Newton's third law of motion. According to this law, every action have equal and opposite reaction and both action and reaction forces acts on different object.
In this case, when a ball is thrown against a wall, the wall exerts an equal force on the the ball but in opposite direction. It follows the newton's third law.
Hence, the correct option is (D).
A 50 Kg box sits at rest on a 30 degree ramp where the coef of static friction is 0.5773 what is the normal force on the box
Final answer:
The normal force on the box resting on an inclined plane with a specific angle and coefficient of static friction is is 425 N.
Explanation:
The normal force on the box can be calculated using the formula:
N = mg cos(θ)
where N is the normal force, m is the mass of the box, g is the acceleration due to gravity, and θ is the angle of the incline. Plugging in the values:
N = 50 kg * 9.8 m/s^2 * cos(30°) = 425 N
Therefore, the normal force on the box is 425 N.
HELP ASAPPPPPPPP!!!!!***worth 100 points***
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Sally walks 10 meters forward and then 5 meters backwards. Which statement most accurate describes the magnitude of her displacement and distance travelled? A) Sally's displacement is 5m less than her distance travelled. B) Sally's displacement is 10m less than her distance travelled. C) Sally's displacement is 5m greater than her distance travelled. D) Sally's displacement is 10m greater than her distance travelled. Free fall is a situation in which the only force acting upon an object is gravity. Why do all objects in free fall have the same acceleration? A) their masses are always the same B) acceleration due to gravity is always the same C) the distance between two objects is always the same D) the gravitational force between two objects are always the same
Displacement is a vector which means it has direction and can have positive or negative values. Distance is a scalar which means it has no direction and positive only.
Sally walks 10 meters forward and then 5 meters backwards. Forward is postive and backward is negative. Her displacement is +10+(-5) = +5m and her distance is 10+5=15m. So the answer is B) Sally's displacement is 10m less than her distance travelled.
Newton 2nd law states that force = ma. In free fall, the only force is gravity force which is equal to mg where g is gravitational acceleration. The acceleration is always the same because B) acceleration due to gravity is always the same.
Sally walks 10 meters forward and then 5 meters backwards.
forward + backward -
displacement= +10 -5 = +5
distance= 10 + 5 = 15
15-5=10m
so B) Sally's displacement is 10m less than her distance travelled.
Free fall is a situation in which the only force acting upon an object is gravity. force=massxacceleration n gravity force=massx gravity acceleration
so acceleration=gravity acceleration=constant.
ans is B) acceleration due to gravity is always the same
Which of the following is Not true about Mechanical Waves?
A they carry energy
B they transfer matter
C they can be longitudinal
D they require a medium
The answer option which not true about mechanical waves is: B. they transfer matter.
A wave can be defined as a disturbance in a medium that progressively transports energy from its source to another location, without the transfer (transportation) of matter.
In Science (Physics), there are two main (2) types of wave and these are:
Electromagnetic wave: it is a wave that do not require a medium for its propagation and it can travel through a vacuum (empty space).Mechanical wave: it is a wave that requires a medium for its propagation.Some of the properties or characteristics of mechanical waves include the following:
I. Mechanical waves generally carry energy.
II. Mechanical waves can be longitudinal in nature.
III. Mechanical waves require a medium of propagation.
IV. Mechanical waves do not transfer matter.
In conclusion, both electromagnetic and mechanical waves do not transfer matter at all.
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If a circuit has a voltage of 250 volts and a resistance of 25 ohms, what are the amps for the current in the circuit?
Using Ohm's law, which is I = V / R, for a circuit with 250 volts and 25 ohms, the current is calculated to be 10 amps.
Explanation:If a circuit has a voltage of 250 volts and a resistance of 25 ohms, we can calculate the current in amps using Ohm's law, which states that I = V / R (where I is current, V is voltage, and R is resistance). In this case, the current I equals 250 volts divided by 25 ohms, which equals 10 amps. Therefore, the circuit would have a current of 10 amps flowing through it.
Final answer:
To calculate the current in the circuit, use Ohm's law: current (I) = voltage (V) divided by resistance (R). In this case, the current in the circuit is 10 amps.
Explanation:
To calculate the current in the circuit, you can use Ohm's law, which states that current (I) is equal to voltage (V) divided by resistance (R). In this case, the voltage is 250 volts and the resistance is 25 ohms. So, the current can be calculated as:
I = V/R = 250 V / 25 Ω = 10 amps
So, the current in the circuit is 10 amps.
what is not force
A. friction
B. gravity
C. momentum
D.weight
C. Momentum is not a force, its considered a mass, Good Luck!
C. Momentum
Every other opinion is a type of force
What change occurs to the mass of an object when an unbalanced force is applied to it?
A. The mass increases.
B. The mass decreases.
C. The mass remains the same.
D. The mass reduces to zero.
E. The mass changes by an indeterminate amount.
I would say C) is your answer
Answer:
The mass remains the same.
Explanation:
Unbalanced forces are the type of forces in which the system moves in a particular direction. There is some net force which acts on it.
When an unbalanced force applied to an object, the object will move in the direction where maximum force is applied. There is no effect of unbalanced force on the mass of an object. Also, the mass of an object remains same at each and every locations.
So, the correct option is (c) "The mass remains the same".
Two liquids are poured into two cups. Cup A contains a colorless, odorless liquid. Cup B contains a colorless liquid with a strong odor. An ice cube floats in Cup A but sinks in Cup B. When heated, the liquid in Cup B boils at a much lower temperature than the liquid in Cup A. What kind of properties are used to compare the two liquids? A) visible B) chemical C) physical D) phase change
the correct answer is C. physical
Answer:
c physical
Explanation:
Physical properties are used to compare the two liquids. Both water and rubbing alcohol have the same clear color while their boiling points, odor, and densities are all different.
In some areas, farmers have installed windmills to generate electricity to run the farm. Some are generating a surplus of electricity and selling it back to the power company. The local power company burns fossil fuels, which pollute the environment, to generate electricity. Windmills do not pollute the environment. Evaluate the statements and choose the statement that best describes how the windmill technology benefits the environment. (2 points)
Windmill technology is a valuable resource that should be used whenever possible. The great advantage is that it uses a nonrenewable resource, the wind, to generate electricity. This is an advantage because nonrenewable resources will always be available.
Windmill technology allows individuals to generate power without polluting the environment. Some individuals could make money selling the power to the power company. This extra money will make the farmers' lives better.
Windmill technology can generate power using a renewable source of energy that does not pollute the environment. By generating a surplus of energy, individuals can sell it to the power company which can replace the energy generated by burning fossil fuels.
Windmill technology might use a renewable resource to generate power but putting the windmills up along the farms damages the environment. The advantage of using a renewable resource to generate power is less important than keeping farms free of windmills that might take up space.
Windmill technology can generate power using a renewable source of energy that does not pollute the environment. By generating a surplus of energy, individuals can sell it to the power company which can replace the energy generated by burning fossil fuels.
The third alternative.
Answer:
Option (3)
Explanation:
Windmills are usually considered to be a structure that is commonly used in the region where there is a high amount of wind supply and converts the wind energy into electrical energy.
Wind is a renewable resource as it can be regenerated, and it does not emit any kind of harmful gases that can pollute the environment.
As these windmills produce electricity, it is being used by the farmers in the given region, and the excess amount of energy is sold to the various power companies by the individuals. This electrical energy so produced directly replaces the fossil fuels, that emits a significant amount of carbon and affects the environment.
Thus, the correct answer is option (3).
a block of stone measures 15cm x 15cm x 20 cm.What is the total surface area of the stone
This should help look at the pictures?
he calculation of kinetic energy uses the formula, KE = 1 2 mv2. Identify the unit that is required for mass and velocity, respectively, to determine the kinetic energy in Joules.
Explanation:The kinetic energy of a moving object is given by:
where m is the mass of the object and v is its speed. The ball in this problem has a mass of m=0.5 kg and a velocity of v=10 m/s, therefore if we plug these numbers into the formula, we find the kinetic energy of the ball:
how does a planet's gravity change the path of a space probe
it can make the probe orbit around the planet or get the probe sucked into the atmosphere
A spacecraft's velocity is altered by a gravity assist around a planet as a result of entering and departing the gravitational sphere of influence of the planet.
What is Gravity assist ?
A spacecraft's velocity is altered by a gravity assist around a planet as a result of entering and departing the gravitational sphere of influence of the planet. The speed of the spaceship rises as it gets closer to the planet and falls as it departs the planet. Although the speed acquired when arriving and lost when departing are almost identical, the spacecraft is nevertheless impacted by the planet's rotation around the sun. The spacecraft approaches the planet from the direction of the orbital velocity of the planet and departs in the opposite direction to increase speed. In both types of manoeuvres, the energy transfer compared to the planet's total orbital energy is insignificant. The spacecraft approaches the planet from a direction away from the planet's orbital velocity to slow down. The two bodies' combined kinetic energy are stable. Therefore, a slingshot manoeuvre can be employed to alter the spacecraft's trajectory and speed with respect to the Sun.
The spacecraft's speed can undoubtedly be changed with the use of rocket engines. However, the propellant needed for rocket thrust has a mass, thus even a slight change in velocity results in a much higher need for fuel to escape Earth's gravitational well. This is due to the fact that the primary-stage engines must lift additional propellant above and beyond what is required to hoist that additional propellant. As the needed spacecraft delta-v rises, the liftoff mass requirement grows exponentially.
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In what way does an earthquake provide evidence about the layers of Earth?
Because an earthquake happens when two of the atomic plates rub together .
Hopes this helps. PLZ MARK BRAINIEST
Newton’s 3rd law of motion states that “every action has an equal and opposite reaction.” A golf ball was hit with a force of 200 N forward. Explain how this relates to Newton’s 3rd law of motion.
Answer:
Example of Newton's III law
In the, golf the ball was hit by a club with certain force. As the club hits the ball it's the action. When the ball flies away its the reaction. When a person swings a golf club at the ball, when it hits the ball, it causes the ball to roll up the face of the club and into the air towards the target.if the velocity of a body changes from 13 m/s to 30 m/s while undergoing constant acceleration what's the average velocity of the body?
The answer is 21.5 m/s.
Answer:
Average velocity of the body is 21.5 m/s
Explanation:
It is given that,
The velocity of a body changes from 13 m/s to 30 m/s while undergoing constant acceleration.
The initial velocity of the body, u = 13 m/s
The final velocity of the body, v = 30 m/s
It is moving under constant acceleration. The sum of initial velocity and final velocity divided by 2 is called the average velocity of the body. It is given by :
[tex]v_{avg}=\dfrac{u+v}{2}[/tex]
[tex]v_{avg}=\dfrac{13\ m/s+30\ m/s}{2}[/tex]
[tex]v_{avg}=21.5\ m/s[/tex]
Hence, the average velocity of the body is 21.5 m/s
Gravity is affected by the (2 points)
charge of the objects and whether the charges are the same or opposite.
force applied to the object when moving.
mass of the objects and the distance between two objects.
the size of the objects and the difference in charge.
Answer:
"mass of the objects and the distance between two objects."
Explanation:
The force of gravity is a function directly proportionate to the product of the two masses of the two objects under consideration, and indirectly proportionate to their squared distance.
[tex]F_g \,\,\,\mbox{proportional to}\,\,\, \frac{m_1\cdot m_2}{d^2}[/tex]
The relationship is made exact by inserting the gravitational constant G
[tex]F_g = G\cdot\frac{m_1\cdot m_2}{d^2}[/tex]
with a value that was measured by Cavendish in a clever experiment, back in the days.
Gravity is affected by the mass of the objects and the distance between them.
Explanation:Gravity is affected by the mass of the objects and the distance between them. The force of gravity between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. The charge of the objects and whether the charges are the same or opposite do not affect the gravitational force.
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In which of these mediums do particles of light travel the fastest?
a. a vacuum
b. glass
c. water
d. wood
light travels fastest through a vacuum which means "empty space, void"
Answer:
a). Vacuum
Explanation:
As we know that the refractive index of the medium is defined as
[tex]Refractive \: index = \frac{c}{v}[/tex]
here we know that
c = speed of light in vacuum
v = speed of light in medium
so here we know that
[tex] v = \frac{c}{\mu}[/tex]
so speed will be maximum for that medium for which value of refractive index is minimum
So here from all given options minimum refractive index is for vacuum
so correct answer will be
a). Vacuum
I Transformer I got primary coil with 300 turns and a secondary coil with 600 turns adult voltages 75 volts what is the input voltage
Formula
Primary Turns /Primary Voltage = Secondary Turns/Secondary Voltage
Givens
Primary Turns = 300Secondary Turns = 600Primary voltage = xSecondary Voltage = 75Solution
300 / x = 600 / 75 Cross multiply
600*x = 300 * 75 Combine the right
600*x = 22500 Divide by 300
x = 22500/600 Do the division
x = 37.5 Answer
Answer:
We know that,
The ratio between voltages in the coils is the same as the ratio of number of turns in the coil
Equation: (Vp / Vs) = (Np / Ns)
Ns, Np = no.of turns on secondary and primary coils respectively
Vs, Vp = no.of turns on secondary and primary voltages respectively
(Vp / Vs) = (Np / Ns)
Vp / 75 = (300 / 600)
Vp = 37.5 Volts
input voltage is 37.5 volts.
while racing on a flat track a car rounds a curve of 56m radius and instantaneously experiences a centripetal acceleration of 36 m/s how fast was the car going.
25m/s
45m/s
35m/s
2.0 x 10^3 m/s
45m/s should be the answer because the acceleration changes into's velocity and goes towards the centre in which is 56/ms that equals v^2/R the speed at the instant.
Hope this helped
Regards, ShaggySnaps
Answer:
I am pretty sure its 45 m / s
Gina is driving her car down the street. She has a teddy bear sitting on the back seat. A dog runs in front of Gina's car, so she quickly applies the brakes. The force of the brakes causes the car to stop, but the teddy bear continues to move forward until it hits the car's dashboard. The teddy bear did not stop at the same time as the car becauseGina is driving her car down the street. She has a teddy bear sitting on the back seat. A dog runs in front of Gina's car, so she quickly applies the brakes. The force of the brakes causes the car to stop, but the teddy bear continues to move forward until it hits the car's dashboard.
Answer:
objects in motion tend to stay in motion unless acted upon by an outside force.
which is a charcharacteristic of all ions?
An ion is created by the transfer of electrons. The metals give away the elections and become positively charged. The non - metals take on electrons.
Balance.
So an ion is any atom that either gives away or takes on electrons.
What force is needed to keeps 20kg box moving at a constant velocity when the mk is 0.3021 and the force is a push at 20 degree to the ground
Answer:
63.0 N
Explanation:
According to Newton's second law, the resultant of the forces acting along the horizontal direction is equal to the product of mass and acceleration:
[tex]F_{net}=ma[/tex] (1)
The box is moving at constant velocity, so the acceleration is zero: a=0, and so the net force is also zero.
The net force consists of two forces:
- The horizontal component of the push, given by:
[tex]F_x = F cos \theta[/tex]
where [tex]\theta=20^{\circ}[/tex]
- The frictional force, acting in the opposite direction of the push:
[tex]F_f = \mu mg[/tex]
where [tex]\mu=0.3021[/tex] is the coefficient of friction, m=20 kg is the mass of the box and g=9.8 m/s^2.
Therefore, eq.(1) becomes
[tex]F_x - F_f =0\\F cos \theta - \mu mg =0[/tex]
From which we find the push, F:
[tex]F=\frac{\mu mg}{cos \theta}=\frac{(0.3021)(20 kg)(9.8 m/s^2)}{cos 20^{\circ}}=63.0 N[/tex]
To keep a 20kg box moving at a constant velocity, a force of 58.836 N is needed.
Explanation:To keep a 20kg box moving at a constant velocity, we need to apply a force equal to the force of friction. The force of friction is calculated by multiplying the coefficient of friction (0.3021) by the normal force on the box. The normal force is equal to the weight of the box, which is 20kg multiplied by the acceleration due to gravity (9.8 m/s²). Therefore, the force of friction is (0.3021)(20kg)(9.8 m/s²) = 58.836 N.
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A coin is thrown with a velocity of 0 m/s down a dry well and hits bottom in 1.2s, what’s the depth of the well?
Answer:
The well is 7.1 meters deep.
Explanation:
The formula to use here is the distance in a uniformly accelerated motion:
[tex]d = \frac{1}{2}at^2+v_0t+d_0[/tex]
where d stands for distance, t for time, a for acceleration, v0 and d0 for initial velocity and distance, respectively. Since the initial distance and velocity are both zero, we are left with the first term. The coin is in free fall and so it is accelerated by gravity:
[tex]d = \frac{1}{2}at^2= \frac{1}{2}gt^2=\frac{1}{2}9.8\frac{m}{s^2}1.2^2s^2=7.1m[/tex]
The well is 7.1 meters deep.
Your town is considering building a nuclear power plant. Describe at least two advantages and two disadvantages of this project. Based on these factors would you recommend that they continue with the project or consider other options?
Answer:
Advantages : 1. Large demands of power supply are met easily by the nuclear power plants.
2. Unfavorable weather conditions do not effect its operation.
Disadvantages:
1. Disposal of nuclear waste will pose a serious problem locally for the town.
2. Establishment costs for a nuclear power plant are high compared to to thermal or hydro power plants.
Explanation:
Nuclear fuel used in a nuclear power plant is called the fission material . It is a radioactive element like isotopes of Uranium. The heat generated by the nuclear power plant can be removed efficiently if the reactor is built in a place that has water resources. Cooling towers can also be used to cool it. Operation costs are less compared to other types of power plants. If the nuclear waste can be handled without causing any hazards to human life, the town can definitely support the project.
What is the product of an object’s mass and velocity? momentum net force kinetic energy
Answer:
The correct answer option is momentum.
Explanation:
Momentum is the product of an object's mass and velocity.
It is a term which describes the relationship between the mass of an object and the velocity of an object.
Momentum can be represented in the form of an equation as:
P = mv
where P is the momentum,
m is the mass of the object; and v is the velocity of that object.
The product of an object's mass and its velocity is defined as its momentum in physics. Momentum is a measure of motion especially relevant in discussions about collisions.
Explanation:In Physics, the product of an object's mass and its velocity is called its momentum. Momentum is a vector quantity meaning it has both direction and magnitude. It's often used in discussions about collisions. If an Object A with a mass of 1kg is moving at a velocity of 5 m/s, for instance, its momentum would be 5 kg*m/s. So simply put, momentum can be calculated by multiplying the object's mass by its velocity.
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A 50 Kg box sits at rest on a 30 degree ramp where the coef of static friction is 0.5773 what is the weight of the box?
Given Data:
mass (m) = 50 Kg
W = m*g = 50×9.81 = 490.5 N
Coefficient of static friction (μs) = 0.5773
ramp angle = 30 degrees
determine Normal force=?
From the figure we know that
Normal force (N) = μs.W cosΘ
= 0.5773 ×490.5×cos 30
= 245.22 N
Therefore, The Normal force = 245.23 N
Which of these has a lower frequency than visible light?
A.gamma rays
B.ultraviolet rays
C.infrared rays
D.X-rays
plz hurry
Answer C, infrared rays
Gamma rays, ultraviolet rays and X-rays are more energetic (Shorter wave lengths and higher frequencies) than visible light.
Infrared rays, microwaves and radio waves are less energetic (Longer wave lengths, lower frequencies) than visible light.
Hope this information is very helpful to you
Which of the following is a chemical reaction? A. breaking a glass pane B. freezing water C. digestion of food D. cutting down a tree E. evaporation of rubbing alcohol Reset
The answer to the question "Which of the following is a chemical reaction?" is C. digestion of food.
The question which asks, "Which of the following is a chemical reaction?" involves identifying which activities involve chemical changes where the identity of the substances involved changes. A chemical reaction involves breaking old chemical bonds and forming new ones, leading to the production of one or more new substances with different properties from the original substances.
Breaking a glass pane is a physical change.Freezing water is a physical change.Digestion of food is a chemical reaction because it involves enzymatic processes that break down food into simpler, absorbable compounds.Cutting down a tree is a physical change.Evaporation of rubbing alcohol is a physical change.Therefore, the answer to the question is C. digestion of food, as it is the process that includes chemical reactions.
why quantity refractive index dooesn't have unit
Refractive index is expressed as a ratio of speed of light in vacuum relative to the speed of considered medium. As it is a ratio and the units m/s or km/h cancel out each other. Therefore, the qauntity refractive index does not have any unit. I hope it will be helpful to you. Thank you
Black holes are:
A) Star remnants from super massive stars which gravitational collapse can not be halt by electron or neutron degeneracy and gravity is so strong in their vicinity that not even light can escape.
B) Regions of the universe with space empty of matter or radiation that becomes so dark that forbids us from investigating it.
C) Regions of space where matters is not sufficiently hot to radiate in the visible spectrum.
Black holes are:
A) Star remnants from super massive stars which gravitational collapse can not be halt by electron or neutron degeneracy and gravity is so strong in their vicinity that not even light can escape.
What is Black hole ?Black holes are volumes of space where gravity is extreme enough to prevent the escape of even the fastest moving particle .
Black hole is formed by the collapse of individual star which are relatively small but incredible dense which leads to a great amount of gravitational force pulling on objects .
It is a region of spacetime where gravity is so strong that nothing( no particle , light etc ) can escape from it
hence , correct option is A) Star remnants from super massive stars which gravitational collapse can not be halt by electron or neutron degeneracy and gravity is so strong in their vicinity that not even light can escape.
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A 12 kg sled is moving at a speed of 3.0m/s. At which of the following speeds will the sled have four times as much kinetic energy
Given that
m = 12 kg ,
speed (v) = 3 m/s
kinetic energy ( KE) = 1/2 × m × v² Joules
= 1/2 × 12 × 3²
= 54 J
If we have the options we can find the speed by keeping the speed in above formula. ( 54 × 4 =216 J) for the speed of __________m/s
The kinetic energy of an object can be calculated using the formula KE = 0.5*m*v^2. If the speed of a 12 kg sled is quadrupled from 3.0 m/s to achieve four times the kinetic energy, the new speed would be approximately 6 m/s.
Explanation:In this particular physics problem, the student is trying to understand the concept of kinetic energy. The kinetic energy of an object can be calculated with the formula KE = 0.5 * m * v^2, where m is the mass, and v is the speed. In the student's question, we know the mass (m) of the sled is 12kg and the speed (v) is 3.0m/s. The kinetic energy is, therefore, 0.5 * 12 kg * (3.0 m/s)^2 = 54 Joules.
If we want four times the kinetic energy (4 * 54 J = 216 J), we use the kinetic energy formula again and solve for v, resulting in √((2*216 J)/12 kg) roughly equals 6 m/s. Thus, the sled must be moving at approximately 6 m/s to have four times as much kinetic energy.
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