A box has a mass 40 kg
what is the weight of box ????
​

Explanation

a uniformly accelerated motion is the one in which the acceleration of the particle throughout the motion is uniform,to fidn the time take we can use the formula:

Step 1

a)Let

b) now, replace

therefore, the answer is 2 seconds

I

Answer:Newton used these laws to explain and explore the motion of physical objects and systems, Newton's three laws are: If an object experiences no net force, its velocity will remain constant. The object is either at rest and the velocity is zero or it moves in a straight line with a constant speed.

Explanation:

Explanation:

a) Distance ➤ (80+50+70+40) m. ➤ Distance= 240m.

b) Displacement ➤ (50+40)m. ➤ Displacement= 90m

c) Average Speed ➤ Total distance travelled/total time taken

                              ➤ 240/48

                              ➤ 5 \(ms^{-1}\)

d) Average Velocity ➤ Total displacement/total time taken

                                 ➤ 90/48

                                 ➤ 1.875 \(ms^{-1}\)

The observed frequency will be greater than the source’s frequency (option - A) is correct answer.

If the source and observer are moving simultaneously in either case—moving observer or moving source—you'll notice that the frequency increases. The frequency decreases if they are drifting apart. Whether the source is moving or the observer is moving will affect how much the frequency changes.

Although the waves move at the same speed, the frequency that is observed is affected by any relative movement between the source and the observer. The wavelength changes along with the observed frequency. When an observer and a source are moving in the same direction, the frequency rises and the wavelength falls.

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Distance traveled, s = 7.5 m Height of the basket, h = 3.0 m Initial height, y0 = 1.8 m Angle of projection, θ = 60°

The horizontal distance traveled by the ball, x can be calculated as x = s = 7.5 m

For the vertical motion, the following formula can be used: y = y0 + v₀ₓt + ½gt² where y is the height of the ball above the ground, y0 is the initial height of the ball, v₀ₓ is the initial horizontal velocity of the ball, t is the time taken, and g is the acceleration due to gravity.

Using the value of y and y0, we get:2.7 = 1.8 + v₀sinθt - ½gt²

The horizontal and vertical components of initial velocity can be found as: v₀ₓ = v₀cosθv₀sinθ = u

Using the value of v₀sinθ = u, we get:2.7 = 1.8 + ut - 4.9t²

Since the ball hits the basket, its final height is equal to the height of the basket, i.e., 3 m.

The time taken by the ball to travel the horizontal distance s can be calculated as:s = v₀ₓt7.5 = v₀cosθt

Thus, t = 7.5 / v₀ₓ

Substituting this value in the equation above, we get: 2.7 = 1.8 + u(7.5 / v₀ₓ) - 4.9(7.5 / v₀ₓ)²

Thus, we have two equations:7.5 = v₀ₓt and 2.7 = 1.8 + u(7.5 / v₀ₓ) - 4.9(7.5 / v₀ₓ)²

We need to find the initial speed u so we can solve the second equation for u. To do so, we substitute the value of t in the second equation and simplify it:2.7 = 1.8 + u(7.5 / v₀ₓ) - 4.9(7.5 / v₀ₓ)²7.5 / v₀ₓ = t = (7.5 / v₀ₓ)² / 14.7

Substituting this value in the above equation:2.7 = 1.8 + u(7.5 / v₀ₓ) - 4.9[(7.5 / v₀ₓ)² / 14.7]²u = 10.86 m/s

Therefore, the initial speed of the ball must be 10.86 m/s for it to go through the basket.

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Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 18 × 1.62

We have the final answer as

Hope this helps you

This phenomenon is caused by the refraction of light as it passes from one medium (air) to another (water).

Light refraction breaks the stick where it reaches the water. Light refracts when it goes from air to water. Light changes speed and direction when it flows from air to water. Refraction causes this alteration. The angle light enters the water determines refraction.

In this situation, the stick appears to move because light rays from the submerged section bend or refract as they transit from water to air. This optical illusion makes the stick look shattered at the water's surface.

Light refraction at the air-water contact makes the stick seem shattered.

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The resulting energy balance is q= -9623kj

What is resulting energy ?

resulting energy sorted in objects , molecules and atom , energy take many different forms .

It can be converted one into another .

Solution -

The vessel is 10m^3 and initially contains 100 kg of stream. so we can get

V= 0.1 m^3/kg

Between specific value and saturated liquid and saturated vapour at p= 2

So q = 0.112

Is rigid so the final mixture which has a mass of 110kg

Q= 0.149

Start with the independent energy balance it state that

- this is not a steady state process.

-please visit so no expension work.

-no mention of moving parts.

Thus the final result energy balance is - q= -9623 kj

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Answer:

Explanation:

I hope this was all you wanted. Everything else seems finished correctly.

In a low-pressure chiller, air and other non-condensable gases can collect in the upper portion of the chiller, typically in the condenser.

Non-condensable gases are gases that are not able to be condensed into a liquid state under normal operating conditions. These non-condensable gases can have a negative impact on the performance of the chiller. They can reduce the cooling capacity of the chiller, increase energy consumption, and cause corrosion in the system.

Therefore, it is important to regularly remove non-condensable gases from the chiller to maintain optimal performance and prevent damage to the system. This is typically done through a process called purging, which involves removing the non-condensable gases from the chiller and replacing them with the proper refrigerant.

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Dropping a ball of dough onto a kitchen counter, its energy store of potential energy is converted into kinetic energy as it falls. Upon impact, the kinetic energy is converted into potential, thermal, and sound energy.

When a ball of dough is dropped onto a kitchen counter, there is a change in the energy store of the dough. Initially, the dough has potential energy due to its position above the counter. As the dough is dropped, this potential energy is converted into kinetic energy, or energy of motion. As the dough falls, it gains speed and thus increases in kinetic energy.

When the dough strikes the counter, the kinetic energy is converted into a combination of potential energy and thermal energy. The dough compresses and deforms upon impact, increasing its potential energy. The compression and deformation also generates heat, which increases the thermal energy of the dough. A portion of the kinetic energy is also converted into sound energy as the dough makes contact with the counter.

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Hi there!

Answer E.

For a collision to be completely elastic, there must be NO LOSS in kinetic energy.

We can go through each answer choice:

A. Since the ball rebounds at half the initial speed, there is a loss in kinetic energy. This is NOT an elastic collision.

B. A collision involving sticking is an example of a perfectly INELASTIC collision. This is NOT an elastic collision.

C. A reduced speed indicates that there is a loss of kinetic energy. This is NOT elastic.

D. The balls traveling at half the speed after the collision indicates a loss of kinetic energy, making this collision NOT elastic.

E. This collision indicates an exchange of velocities, characteristic of an elastic collision. We can prove this:

Let:

m = mass of each ball

v = velocity

We have the initial kinetic energy as:

\(KE = \frac{1}{2}mv^2 + 0 = \frac{1}{2}mv^2\)

And the final as:

\(KE = 0 + \frac{1}{2}mv^2 = \frac{1}{2}mv^2\)

Thus, Kinetic energy is CONSERVED. This collision is ELASTIC.

The total energy of the body at evevry point is remained same due to the law of conservation of energy. Distance from A to B and final velocity of the ball just reach before C is 44.3 m/s.

d (distance) from A to B is = √2gh

In this case given are, g = 9.8 m/s² and h = 100m,

so here d = √(2⋅9.8⋅100) = 44.3m.

Final velocity ,v = √2gh

Here given are , v is the velocity, g is the acceleration due to gravity, and h is the height. In this case,

g = 9.8 m/s² ,h = 100m,

v = √(2⋅9.8⋅100)

= 44.3 m/s (final velocity)

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As per the given values, and uncertainty of the speedometer the actual speed could be 61.33 km/h.

Uncertainty = 2.0 km/h

Measured value = 90 km/h

Calculating the Percent uncertainty -

= (Uncertainty / Measured value) x 100

= (2.0 / 90 ) x 100

= 2.22%

Now, assuming the speedometer has the same percent uncertainty at 60 km/h, this percent uncertainty can be used to determine the range of speeds.

Percent uncertainty = 2.22%

Measured value = 60 km/h

Calculating the range -

= (Percent uncertainty / 100) x Measured value

= (2.22% / 100) x 60

= 1.33

Calculating the Total speed -

= 60 + 1.33

= 61.33

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Complete Question:

If your speedometer has an uncertainty of 2.0 km/h at a speed of 90 km/h ,what is the percent uncertainty? (b) If it has the same percent uncertainty when it reads 60 km/h , what is the range of speeds you could be going?

When the net force of opposite forces is zero, the forces are said to be balanced. A force is a physical phenomenon that refers to the push or pull on an object that can change its motion.

A force can accelerate or decelerate an object, and its unit of measurement is the Newton (N).If an object is being pushed or pulled in opposite directions with the same amount of force, the forces are balanced, and the object will remain still. If an object is being pushed or pulled in opposite directions with different amounts of force, the forces are unbalanced, and the object will move in the direction of the larger force.

When the forces acting on an object are equal in size but opposite in direction, they cancel each other out, and the net force is zero. The object will remain stationary since there is no force pushing or pulling it in any particular direction. Forces that have a net force of zero are known as balanced forces.

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Answer:

b.) Length

Explanation:

The length of the string can be changed by removing it from the slotted bracket and placing it back  in. You can change the mass by varying the number of washers on the mass hanger. The amplitude  can be changed by varying the starting angle of the pendulum (low, medium, and high angle). sorry if wrong

Answer:

The magnetic force acting on the proton is 1.68 x 10^-18 N.

Explanation:

magnetic field, B = 5 T

speed , v = 2.1 m/s

charge q = 1.6 x 10^-19 C

Angle, A = 90 degree

The magnetic force on the charge particle is given by

\(F = q v B sin A\\\\F = 1.6\times 10^{-19}\times 2.1\times 5\times sin 90\\\\F = 1.68\times 10^{-18} N\)

The Force need to accelerate the object is by 3 m/s² is 15 N.  Suppose a friction force of 5 N acts on the motion of the object, the force needed to be applied to the object is 20 N

This can be defined as the product of the mass and the acceleration of a body. The S.I unit of force is kgm/s or Newton(N)

To calculate the force needed to accelerate a mass of 5 kg object at 3 m/s² we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Suppose a frictional force of 5 N acts on the motion, The force applied is

Where:

Substitute into equation 2

Hence, The Force need to accelerate the object is by 3 m/s² is 15 N. Suppose a friction force of 5 N acts on the motion of the object, the force needed to be applied to the object is 20 N

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The work done by the drag force from the air on the skydiver is negative, as the force opposes the motion of the skydiver.

This means that the drag force is doing work to slow down the skydiver's descent. The drag force results from the interaction of the parachute with the air. When the parachute is open, air resistance increases, causing the drag force to act in an opposite direction to the skydiver's motion.

The drag force does work to reduce the speed of the skydiver's descent. The work done is equal to the force multiplied by the distance over which it is applied. The drag force pushes against the skydiver, thus performing negative work. The total amount of work done by the drag force is equal to the magnitude of the force multiplied by the distance the skydiver has descended while the force is applied.

To summarize, the work done by the drag force on the skydiver is negative because the force acts in an opposite direction to the skydiver's motion, slowing down their descent.

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Answer:

i think it's A

Explanation:

Answer:

The answer is A

Explanation:

When friction from Earth's upper atmosphere does -7.5×10^9 J of work on a satellite, it means the satellite has lost that amount of energy due to friction.

To find the new orbital speed, we first need to determine the change in the satellite's kinetic energy. Since work done equals the change in kinetic energy, we have:
ΔKE = -7.5×10^9 J

Next, we can use the formula for kinetic energy: KE = 0.5 × m × v^2, where m is the satellite's mass and v is its speed. To find the change in speed, we rearrange the formula:
Δv^2 = 2 × ΔKE / m
Now, we can calculate the new speed by taking the square root of the sum of the initial speed squared and the change in speed squared:
v_new = sqrt(v_initial^2 + Δv^2)
By plugging in the values and solving for v_new, you'll obtain the satellite's new orbital speed after friction has done work on it.

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To prepare 100ml of a 1.5m Kbr solution, 1.785 g of KBr is required.

Potassium bromide, also referred to as KBr, is a salt that is frequently employed as a sedative and anticonvulsant.

Kalii bromidum, tripotassium tribromide, and potassium bromide salt are some other names for potassium bromide.

The taste of the odorless potassium bromide salt, which comes in white crystals, colorless crystals, and white granular solids, is sharp, bitter, salty. The pH of aqueous KBr solutions is 7.

we can use the formula:

mass = molarity x volume x molar mass

where molar mass of KBr is 119.00 g/mol.

So,

mass = 1.5 M x 100 ml x (119.00 g/mol) / 1000 ml/L

mass = 1.785 g

Therefore, 1.785 g of KBr is required to prepare 100 ml of a 1.5 M solution.

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The thermal energy will be more reflected by the surface of the Marble.

The thermal energy will be more reflected by the surface of the marble because marble has a higher thermal conductivity so will absorb more heat and will release more energy.

The thermal conductivity of any material is defined as the ability of the material to transfer heat through them. If the material is more conducting more heat will transfer through it.

For example, copper has a very high thermal conductivity that's why it is used in the wiring and also used in air conditioning piping so it can transfer faster energy in a lesser time.

So the marble absorbs more heat due to its higher thermal conductivity and becomes hot and will release a higher amount of heat than the ground.

Thus the thermal energy will be more reflected by the surface of the Marble.

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Answer:

marble

Explanation:

Answer:

29 Joules

Explanation:

58N * 0.5m =

58 * 0.5 =

58 * 5/10 =

290/10 = 29 Joules

A). To move the bar to the right with a constant speed of 6.00 m/s, we need to find the force required. The force required is the force of the magnetic field that acts on the bar. The power dissipated in the resistor is 6.98 W.

This force is given by the formula: F = BILsinθwhere,F is the force B is the magnetic field I is the current L is the length of the conductorθ is the angle between the magnetic field and the current direction Now, the current in the bar is given by: I = V/R where, V is the voltage applied across the resistor R is the resistance of the resistor Given, V = BLV/Rsinθwhere,L = 1.6 m B = 2.20 T, and R = 4.00 ?θ = 90° = π/2 radians So, V = 2.20 × 1.6 × 6.00/4.00  = 5.28 V The current in the circuit is, I = V/R = 5.28/4.00 = 1.32 A  

Therefore, the force required is: F = BILsinθ = 2.20 × 1.6 × 1.32 × 1 = 4.3872 N(b) The power dissipated in the resistor is given by: P = VI where, V is the voltage applied across the resistor I is the current in the circuit From the above calculations, V = 5.28 VI = 1.32 AP = VI = 5.28 × 1.32 = 6.98 W

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The wavelength of the electromagnetic wave in vacuum is 25 meters.

The relationship between the frequency (f) and the wavelength (λ) of an electromagnetic wave is given by the equation:

c = fλ

where c is the speed of light in vacuum, which is approximately 3.00 x 10^8 meters per second. Rearranging this equation to solve for λ, we get:

λ = c/f

Substituting the given frequency of 12 MHz into this equation, we have:

λ = (3.00 x 10^8 m/s)/(12 x 10^6 Hz) = 25 meters

Therefore, the wavelength of the electromagnetic wave in vacuum is 25 meters.

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Answer:

Explanation:

While traveling through space, asteroids sometimes collide with each other and break up into smaller fragments. Comets shed dust as they roam the solar system. These 'break ups' result in numerous small particles and fragments, called meteoroids, which orbit the sun. ... Thus a meteor, or shooting star, is formed.

Answer:

While traveling through space, asteroids sometimes collide with each other and break up into smaller fragments. Comets shed dust as they roam the solar system. These 'break ups' result in numerous small particles and fragments, called meteoroids, which orbit the sun. Thus a meteor, or shooting star, is formed.

Explanation:

Answer:

In my mind when I hear the word momentum it comes that it is the product of mass and velocity.

The word momentum means mass and velocity taken together.

Mass is an intrinsic basic physical quantity which tells us about the amount of matter contained in a body. It is a scalar quantity and it is measured in kilogram(Kg).

Velocity is the rate of change of displacement . It is defined as displacement per unit time. It is a vector quantity and measured in meter per second (m/s)

The product of mass and velocity is momentum. When a body possesses both mass and velocity we say that it has momentum. It is a vector quantity. Its unit is kg m/s

Mathematically we write momentum as,

P = mv

Mathematically we write momentum a

Where, P = momentum

m = mass

v= velocity.

When a force is applied on a body, it changes its momentum. The relationship between force and momentum is given by Newton's second law of motion which states that the rate of change of momentum is directly proportional to the force applied,

F = Δp /Δt

Where F= force

Δp = change in momentum

Δt = time taken for the change in momentum to occur.

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Heat waves are defined by the difference in temperature compared to the normal temperature typical of a region.

A heatwave happens when a location has extremely high maximum and minimum temperatures over the course of three days. This is taken into account in light of the area's climate and previous weather patterns.

An protracted period of unusually warm weather that frequently lasts longer than two days is known as a heat wave. Heat waves can occur both with and without a lot of humidity. They can spread out across a large region, placing many people in danger of extreme heat.

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Answer:

One way is to polish the surface and the other way is to use oil or grease between the surfaces.

Explanation:

Hope this is right lol :)