what is the difference between soldering and solder?
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First let's calculate the total falling time of the snowball.

It will fall from the height of 8.4 meters (7 m from the bridge plus 1.4 m from the student) to the height of 3.5 meters (top of the bus), so the total height is 4.9 meters.

Calculating the falling time, we have:

After 1 second, the bus will move 13 meters, so it will be 12 meters from the bridge when the snowball is in the desired height.

The bus has 12 meters long, so the range of horizontal distance the snowball needs to travel is from 12 meters to 24 meters:

Since the travel time of the snowball is 1 second, the minimum and maximum speed the snowball should be thrown is:

Therefore the range of velocities is from 12 m/s to 24 m/s.

The maximum mass of the object that will be added to the box for it to float is 8786 g.

The principle of floatation states that an object will float in a fluid in it displaces in own weight of the fluid.

This implies that an object will float in a fluid if the weight of the fluid displaced by the object is equal to the weight of the object.

The mass of the object that will be supported by the fluid is calculated from the formula below:

the density of the fluid = 1244 kg/m³

the volume of the object = 0.407 m * 0.176 m * 0.164 m

the volume of the object = 1.175 * 10⁻² m³

mass of object = 1244 kg/m³ *  1.175 * 10⁻² m³

mass of object = 14.617kg or 14617 g

Mass of object to be added = 14617 g - 5831 g

Mass of object to be added = 8786 g

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Angular velocity of the platform with its load is 0.94 rad/s.

Since, there is no external torque acting on the system, the momentum is conserved.

So, Initial momentum, L₁ = Final momentum, L₂

I₀ω₁ = (I₀ + m₁r₁² + m₂r₂²)ω₂

I₀ω₁ = [1/2 x 80.7 x (1.91)²] (1.57)

I₀ω₁ = 147.2 x 1.57 = 231.1 kgm²/s

So,

231.1 = [147.2 + 9.57(4/5 x 1.91)² + 21.1(1.91)²]ω₂

Therefore, the final angular velocity,

ω₂ = 231.1/246.5

ω₂ = 0.94 rad/s

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Answer:

I dont. understand the question, maybe insert the picture?

Answer:

can you include a picture

Decompose the forces acting on the rocket in horizontal and vertical components.

• net horizontal force:

∑ F = (12.3 N) cos(65°) - 2.5 N ≈ 2.7 N

(notice we're taking "to the right" to be the positive direction)

• net vertical force:

∑ F = (12.3 N) sin(65°) - 1.2 N ≈ 9.9 N

The resultant force then has magnitude

√((2.7 N)² + (9.9 N)²) ≈ 10.3 N

Since the horizontal and vertical components of the resultant are both positive, it points at an angle between 0° and 90° from the positive horizontal, so that

tan(θ) ≈ (9.9 N) / (2.7 N) ≈ 3.69

===>   θ ≈ arctan(3.69) ≈ 75°

Answer:

a

Explanation:

Answer:

Using Newton’s 2nd law

Ft=m(v-u)

m=50*0.2/10

m=10/10

m=1kg

Explanation:

By using Newton's second law, the mass of the object is 1kg

FORCE

The force on an object is a push or pull effect.

Given that a force of 50 N is applied to an object for 0.2s , and it

changes its velocity by 10m/s. The parameters are;

From first linear equation of motion,

V = U + at

V - U = at

Where V - U = change in velocity = 10 m/s

Substitute it and time t into the equation.

10 = 0.2a

a = 10/0.2

a = 50 m/\(s^{2}\)

From second Newton's law, F = ma

Substitute the force and the acceleration into the formula

50 = 50m

m = 50/50

m = 1 kg

Therefore, the mass of the object is 1kg.

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Answer:

Birds and fish both have a backbone structure, which makes them structurally and functionally similar.

Explanation:

The statement which is true regarding electrical drawings is; Choice A: Dimensions and distances matter greatly on blueprints but not on schematics.

The major difference between a schematic diagram and a blueprint lies in the fact that blueprint means a type of paper-based reproduction process producing white-on-blue images, used primarily for technical and architecture's drawings, now largely replaced by other technologies, whereas schematic diagrams are simplified line-drawing generally used by engineers and technicians to describe and understand how a system works at an abstract level.

Ultimately, Dimensions and distances matter greatly on blueprints but not on schematics.

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solution:

the formula is T = F * r * sin(theta) so just input the numbers and solve it.

Explanation:

Torque is the twisting force that tends to cause rotation. The point where the object rotates is known as the axis of rotation. Mathematically, torque can be written as T = F * r * sin(theta), and it has units of Newton-meters

Given

The voltage of the battery, V=20.0 V

The resistance of the two resistors are 40 ohm each.

The two resistance are connected in parallel

To find

The current through the circuit.

Explanation

The resistors are connected in parallel

Thus the equivalent resistance is

By Ohm's law,

where I is the current through the battery

Putting the values

Conclusion

The current through the battery is 1.00 A

The time needed for the block to travel from -A/2 to A/2 is mathematically given as

t=0.5sec

Generally, when the start point is the mean intial position and it goes from  A/2  down through the right goes through and fro back to the mean position, and this is after it must have gone through -A/2. Hence it has finished one cycle (0.1 sec.)

In conclusion, for an -A/2 to A/2 oscillation, then it will finish half-cycle given time period to be

t=1/2

t=0.5sec

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Answer:

Resistance, R = 60 Ohms

Explanation:

Given the following data;

For the first heater;

Voltage, V = 120 V

Resistance, R = 15 Ohms

For the second heater;

Voltage, V = 240 V

To find the resistance in the second heater;

First of all, we would determine the power rating of the heaters using the formula below;

Power = voltage²/resistance

Power = 120²/15

Power = 14400/15

Power = 960 Watts

Next, we find the resistance in the second heater;

Power = V²/R

960 = 240²/R

Cross-multiplying, we have;

960R = 57600

R = 57600/960

R = 60 Ohms

Answer:

Therefore, the voltage required is 20 volts

Explanation:

To find the voltage that will send a current of 5 amperes through a bell circuit with a resistance of 4 ohms, we can plug in the values into the equation and solve for V: V=IR

V=(5A)(4Ω)

V=20V

Convert into each other and both are energy are 2 similarities between potential energy and kinetic energy .

Potential energy is a form of stored energy that is dependent on the relationship between different system components. When a spring is squeezed or extended, its potential energy increases. If a steel ball is lifted above the ground as opposed to falling to the ground, it has higher potential energy. It is capable of performing more work when raised. Potential energy is a characteristic of systems rather than of particular bodies or particles; for instance, the system made up of Earth and the elevated ball has greater potential energy as they get further apart.

Potential energy develops in systems having components whose configurations, or relative positions, determine the amount of the forces they apply to one another.

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Answer:

Yes, air can indeed make shadows. A shadow occurs when an object in a light beam prevents some of the light from continuing on in the forward direction. When the light beam hits a wall or the ground, a darker shape is visible where less light is hitting the surface. Refraction is responsible.

Explanation:

Here is a clip of an example of air making a shadow

https://www.seeker.com/stories/air-shadows/

ANSWER:

False

STEP-BY-STEP EXPLANATION:

Even without friction, the efficiency cannot be greater than 100%, because the output cannot be greater than the input, therefore, the statement is false.

Answer:

work

Explanation:

Answer:

C

Explanation:

An object in motion will stay in motion unless acted on by a net positive or negative force.

For answer A. If the object were to be in an orbit, it would inevitably accelerate due to it being acted on by the gravitational force from the object it is orbiting. At different points in the orbit, the object will move at different speeds and continuously transfer between kinetic and potential energy.

For answer B. The object would would not stop their motion. In order for the object to lose energy, it would have to transfer it through friction or through its interaction with a gravitational field.

For answer D. No energy is "required" to maintain constant motion unless the object is willingly fighting against a resistive force like friction or a graviational well.

To determine the thrust applied by the engines, we can use Newton's second law of motion, which states that force (thrust) is equal to mass times acceleration. In this case, we need to calculate the force required to decelerate the plane from 30 m/s to 25 m/s in 12 seconds.

First, we calculate the change in velocity (∆v):

\(\displaystyle\sf \Delta v=25\,m/s-30\,m/s=-5\,m/s\)

Next, we calculate the acceleration (∆a) using the formula:

\(\displaystyle\sf \Delta a=\frac{\Delta v}{\Delta t}\)

where ∆t is the change in time, which is 12 seconds in this case.

\(\displaystyle\sf \Delta a=\frac{-5\,m/s}{12\,s}\)

Now, we can determine the force (thrust) applied by the engines using Newton's second law:

\(\displaystyle\sf F=m\cdot a\)

where m is the mass of the airplane, which is 480000 kg.

\(\displaystyle\sf F=480000\,kg\cdot \left(\frac{-5\,m/s}{12\,s}\right)\)

Calculating the result:

\(\displaystyle\sf F=-200000\,N\)

Therefore, the engines applied a thrust of -200000 Newtons (N) to decelerate the plane. The negative sign indicates that the thrust is in the opposite direction of the motion.

The distance between two objects of radius 6 cm and 2 cm is zero

To find the distance between two objects with radii of 6 cm and 2 cm, we need to consider the center-to-center distance between the objects and subtract the sum of their radii.

Let's denote the radii of the objects as r1 = 6 cm and r2 = 2 cm.

The distance between the centers of the objects can be represented as d = r1 + r2. Adding the radii ensures that we account for the space occupied by both objects.

Substituting the values, we have d = 6 cm + 2 cm = 8 cm.

Now, to find the actual distance between the objects, we subtract the sum of their radii from the center-to-center distance:

Distance = d - (r1 + r2) = 8 cm - (6 cm + 2 cm) = 8 cm - 8 cm = 0 cm.

The resulting distance is 0 cm, indicating that the objects are in direct contact with each other. This means that their surfaces are touching. When the distance between two objects is zero, it implies that they are overlapping or in physical contact. In this case, since the distance is equal to 0 cm, the two objects are touching each other, with their surfaces coming into contact.

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During the "waxing" phases, the two weeks immediately following the New Moon.

New Moon ==> waxing crescent ==> First Quarter ==> waxing gibbous ==> Full Moon

The phase of the moon decides the moon's visibility. The sequence of phases does the moon's visibility increases is; the waxing crescent, first quarter, waxing gibbous, full Moon.

The moon changes shape every day. This is due to the fact that the celestial body has no light of its own and can only reflect sunlight.

Only the side of the moon facing the sun can reflect this light and seem bright. The opposite side appears black. this is a full moon.

We can only see the black section when it lies between the sun and the earth when a new moon occurs. We witness intermediate phases like a half-moon and crescent in between these two extremes.

Following are the sequence of phases does the moon's visibility increase is;

1. Waxing crescent

2. First Quarter

3. Waxing gibbous

4. Full Moon

The phase of the moon decides the moon's visibility. Hence the visibility changes with the change in the phase of the moon.

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Answer: the answer is (C)

Explanation: Bar graphs show comparisons using number comparisons

The rock is actually 22.61 cm beneath the surface. For When viewed from above the surface of the stream at an angle with force, a boulder appears to be 17 cm below the surface of a smooth stream.

The length of a straight line, which is the shortest route between any two points in space, is the distance between them. In classical physics, particularly Newtonian mechanics, this is how distance is typically understood. In two- and three-dimensional space, the straight-line distance is mathematically codified as the Euclidean distance. A force in physics is an effect that has the power to alter an object's motion.

I = O na/nw

17 = O * 1/1.33

O = 17 * 1.33 = 22.61 cm

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Answer:

B. radioactive and it's nucleus can trap or emit particles

Explanation:

Each element is unique because of the number of protons it possesses. All the atoms of one particular element will have same amount of protons. Thus, if I want to change an atom of an element into atom of another element, i must have a way to mess with the proton count and such. These are seen in radioactive process like fusion, fission, nuclear decay etc.

Answer:

This reduces the kinetic energy of the vehicle, slowing it down and causing the temperature of the brakes to increase. Decelerating from very high speeds too quickly can cause a number of problems: The brakes could overheat and the material they are made from could shatter.

Answer:

Blank 1 (asteroids)

Blank 2 (Ceres)

Explanation:

Rocky metallic objects found between the orbits of Mars and Jupiter are asteroids The largest known of these is ceres.

Asteroids are stony elements that circle the Sun. Although asteroids circle the Sun in the same way as planets, they are considerably smaller.]

A dwarf planet located between Mars and Jupiter in the asteroid belt. Ceres was the first asteroid discovered, it was originally classed as a planet,

Rocky metallic objects found between the orbits of Mars and Jupiter are asteroids The largest known of these is ceres.

The correct option from the drop-down menu is asteroids and ceres.

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Answer:

A. Objects remain in the same state of motion unless a force acts on

them.

Newton's first law is objects remain in the same state of motion unless a force acts on them. The correct option is A.

The three fundamental laws of classical mechanics known as Newton's laws of motion describe how an object's motion and the forces acting on it interact.

The following is a other meaning of these laws: Unless a force acts upon a body, it remains at rest or in continual straight-line motion.

According to the first law, until a force acts on an item, it will not alter its motion. According to the second law, an object's force is determined by multiplying its mass by its acceleration.

According to the third law, when two objects interact, they exert equal-sized and opposite-direction pressures upon one another.

Thus, the correct option is A.

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The nature of the image formed by the convex lens is virtual, the position of the image is 30 cm away from the lens on the same side as the object, and the size of the image is twice the size of the object. The magnification is 2, meaning the image is magnified.

Given:

Object height (h) = 5 cm

Focal length of the convex lens (f) = 10 cm

Object distance (u) = 15 cm (positive since it's on the same side as the incident light)

To determine the nature, position, and size of the image, we can use the lens formula:

1/f = 1/v - 1/u

Substituting the given values:

1/10 = 1/v - 1/15

To simplify the equation, we find the common denominator:

3v - 2v = 2v/3

Simplifying further:

v = 30 cm

The image distance (v) is 30 cm. Since the image distance is positive, the image is formed on the opposite side of the lens from the object.

To find the magnification (M), we use the formula:

M = -v/u

Substituting the values:

M = -30 / 15 = -2

The magnification is -2, indicating that the image is inverted and twice the size of the object.

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Explanation:

The earth receives energy from the sun in the form UV, visible, and near IR radiation, most of which passes through the atmosphere without being absorbed or reflected. Of the total amount of energy available at the top of the atmosphere, about 26% is reflected back out to space by the atmosphere and clouds via evapotranspiration which ultimately radiates the energy in the form of long wave radiations. Most of the remaining energy is absorbed in the earth's surface by greenhouse gasses. Because it is warm leads to a higher temperature of the earth.

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