Somebody help. WILL GIVE BRAINLIEST.

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.

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.

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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This should help look at the pictures?

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

Answer:

Example of Newton's III law

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

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

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.

Because an earthquake happens when two of the atomic plates rub together .

Hopes this helps. PLZ MARK BRAINIEST

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.

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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Given that:

mass (m) = 70 Kg ,

height (h) = 4 m = S ,

time (t) = 12 s,

Determine Power P = ?

                            P = rate of doing work = Work ÷  time    

                             Work = F × S         Joules                

                                       =  (70 × 9.81 ) × 4           since F = m.g

                                       =  2746.8 × 4

                                       =  10987.2  J

                                 Work  = 10.98 KJ

                        Now, Power = 10.98 ÷ 12

                                          P  =  0.915 KW  or 915 W

Answer:

Power, P = 228.67 Watts

Explanation:

It is given that,

Mass of bed, m = 70 kg

It is lifted to a top of 4 meter i.e. h = 4 m

Time taken, t = 12 seconds

We have to find the power required to lift the bed. The work done per unit time is called power. Mathematically, it is given by :

[tex]P=\dfrac{W}{t}[/tex]

[tex]P=\dfrac{mgh}{t}[/tex]

[tex]P=\dfrac{70\ kg\times 9.8\ m/s^2\times 4\ m}{12\ s}[/tex]

P = 228.67 watts

Hence, the power required to lift the bed is 228.67 Watts.

Before a person walks through burning coal, the person will make sure their feet are very wet. When they start walking on the coal, this moisture will evaporate and form a protective gas layer underneath the person's feet. You can see examples of this if you happen to drip some water on a hot stove or any very hot surface. The water will very easily glide around on top of a newly formed layer of air underneath it -- like air hockey pucks on an air hockey table. Note that when someone walks through burning coal, typically this is also done very quickly to prevent a great deal of exposure to possible harm. By walking quickly, thinking positively, and letting the water cushion you from immediate danger over a short distance, such a task is possible. You may have also heard of physics teachers demonstrating how this principle works by sticking their hand first in a bucket of water and then quickly in a bucket of boiling molten lead. In the lead, their hand is protected briefly by a layer of gas from the evaporated water (the water vapor). I'm fairly sure that there is a name for this particular layer of gas, but I'm afraid the name is beyond me at the moment. In other words, water vapor has a low heat capacity and poor thermal conduction. Very often, the coals or wood embers that are used in fire walking also have a low heat capacity. Sweat produced on the bottom of people's feet also helps form a protective water vapor. All of this together makes it possible, if moving quickly enough, to walk across hot coals without getting burned. WARNING: Do not attempt to perform any of the actions described above. You can seriously injure yourself. Answered by: Ted Pavlic, Electrical Engineering Undergrad Student, Ohio St.  (citing my source)

The sensation of feeling cold while walking barefoot on a tile floor after being on a carpet can be explained by the different rates of heat transfer. Conduction is the main mechanism at play, where heat is transferred through direct contact between objects. The tile floor conducts heat more effectively than the carpet, leading to a quicker loss of heat from the feet.

The sensation of feeling cold on the kitchen tile floor after walking barefoot across the living room carpet can be explained by different rates of heat transfer. Heat is transferred through three main mechanisms: conduction, convection, and radiation. In this case, conduction is the main mechanism at play.

Conduction is the transfer of heat through direct contact between objects. The rate of heat transfer through conduction depends on factors such as the temperature difference between the objects, the thermal conductivity of the objects, and the contact area between the objects.

In the given scenario, the tile floor conducts heat more effectively than the carpet, causing a quicker loss of heat from the feet in contact with it. This makes the sensation of cold more intense compared to the carpet.

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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:

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

C. Momentum is not a force, its considered a mass, Good Luck!

C. Momentum

Every other opinion is a type of force

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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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

Acceleration is slower, so it's going to be negative:

a=Δv/Δt=(v-v₀)/t=(60-45)/5.0=15/5.0=3 m/s²

Answer:

Acceleration of the car is 3 m/s^2

Explanation:

Given that,

Initial speed of the car, u = 60 m/s (towards north)

Final speed of the car, v = 45 m/s (towards north)

Time taken, t = 5 s

To find :

The magnitude of the acceleration of the car.

Solve :

Let a is the acceleration of the car. It is equal to the rate of change of velocity. Its formula is given by :

[tex]a=\dfrac{v-u}{t}[/tex]

[tex]a=\dfrac{(45-60)\ m/s}{5\ s}[/tex]

[tex]a=-3\ m/s^2[/tex]

[tex]|a|=3\ m/s^2[/tex]

Negative sign shows the car is decelerating.

Therefore, the magnitude of the car's acceleration is 3 m/s^2.

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

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".

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.

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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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.

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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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:

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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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.

Therefore, the answer to the question is C. digestion of food, as it is the process that includes chemical reactions.

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

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.

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.

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.

Formula

Primary Turns /Primary Voltage = Secondary Turns/Secondary Voltage

Givens

Solution

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.

Answer:

objects in motion tend to stay in motion unless acted upon by an outside force.

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.

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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