a 1.57-cm panel of a certain material can absorb 85.5% of incoming rays from a radioactive source. how thick of a panel, in cm, of that same material would you need to absorb 99.2% of the rays?

Answer:

The horizontal component is 0.77ft

The vertical component is 0.67ft

Explanation:

I have attached a quick pdf of the work required for this problem. In order to solve this problem first draw a picture.

The direction of the displacement is 33.7 degrees east of south which means that the horizontal component, x, is the displacement times the sin(33.7). Which makes the equation 1.02*sin(33.7)=x. Similarly for the vertical component, except with cosine instead of sine.

He reaches the bottom of the pole in the time of 2.6 sec .

What is force ?

Mechanics compels any action intended to maintain, alter, or distort the motion of an object. The concept of force is commonly explained using Isaac Newton's three laws of motion. According to Newton's first principles, an object at rest, or in uniform linear motion, will remain in that state until a force is applied. The second law states that when an external force acts on an object, it will accelerate (change in velocity) in the direction of the force. The magnitude of acceleration is directly proportional to the magnitude of the external force and inversely proportional to the amount of matter in the body. Newton's third law states that when one object exerts a force on another object, the second object exerts the same force on the first object. This principle of action and reaction explains why forces tend to deform objects (that is, change their shape), whether or not they move them. Object deformation can usually be ignored when studying object motion.

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Answer:

same

Explanation:

They both have the same volume....so they both displace an equal amount of water and thus experience the same buoyancy force

El niño affects the pattern of rainfall over months to seasons by redistributing heat and wind across the Pacific. As the atmosphere above the heated water surface warms, moist air rises and forms rain clouds.

Surface waters in the central and eastern Pacific Ocean become significantly warmer than usual during an El niño event. This shift is inextricably linked to the atmosphere and the winds blowing across the vast Pacific. Easterly trade winds (which blow from the Americas to Asia) weaken and can even turn westward. This allows large amounts of warm water to slosh from the western Pacific toward the Americas. It also reduces the upwelling of cooler, nutrient-rich waters from the deep, slowing or reversing ocean currents along the equator and the west coasts of South and Central America.

The air circulation above the tropical Pacific Ocean responds to this massive redistribution of ocean heat. The eastern Pacific's typically strong high-pressure systems weaken, altering the balance of atmospheric pressure across the eastern, central, and western Pacific. While easterly winds are typically dry and consistent, Pacific westerlies tend to arrive in bursts of warmer, moister air.

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The Andean Hummingbird (Patagona gigas) has a mass of 70 g and flaps its wings 10 times per second while hovering. Possible answers: between 0.7 J/beat and 1.75 J/beat.

To move an object, it must be converted into energy. The transfer of energy can be done in a force way. This amount of energy transferred by the force that moves the object is called work done. Expressing this concept mathematically, the work W is equal to the force f multiplied by the distance d, or W = fd. If the force is applied at an angle θ to the displacement, the work done is W = fd cos θ. Scientifically, work is done only when a certain distance is traveled or a force is applied. If the object to which the force is being applied is not moving, no work is being done.

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The mass of stone blocks on a sled to build a pyramid is 8960 kg and it needs 14400 N of force to move.

With the aid of the following formula, the maximum amount of friction force that a surface can exert on an item can be quickly determined:

Fnorm = ω *Ffrict

Fnormal = 0.8 * 14000 N

Therefore, F normal = 11200 N

The support force that is applied to an object when it comes into touch with another stable object is known as the normal force. Most of the time, the following formula can be used to easily describe the normal force:

N = mg

Here, N is the normal force we calculated above

Now, substituting the value of force normal , and gravitational acceleration = 9.8 [tex]m/s^{2}[/tex] into the equation

11520 N= m * 9.8

m = 11200/9.8

m = 8960 kg

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The height of the cliff is 104.59 m.

Solution:

Time (t) = 4.62 s

Acceleration due to gravity (g) = 9.8 m/s²

Height (h) =?

h = ½gt²

h = ½ × 9.8 × 4.62²

h = 4.9 × 21.3444

h = 104.59 m

Thus, the height of the cliff is 104.59 m

The maximum point of the parabolic trajectory has a completely horizontal component. Since the velocity is only along the horizontal path, we can conclude that the horizontal velocity at the peak of the motion is zero. The initial horizontal velocity can also be determined by measuring the diameter d of the sphere and dividing it by the time t it takes for the sphere to move across the photogate.

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what is the meaning of life like why do we live just to die?...

This is not a characteristic of the four Jovian planets in our solar system: That they are higher in average density than the terrestrial planets.

Unlike the terrestrial planets of inner solar system (Mercury, Venus, Earth, and Mars), Jovian planets do not have solid surfaces.

They are also less dense than terrestrial planets and are composed of gases. They have many moons and their mass gives them more gravitational pull. They also have rings.

Characteristics of the Jovian Planet are : They all are gaseous bodies, they have ring systems around them and also they have a large number of natural satellites.

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An important difference between planet earth and planet venus is that venus lacks an atmosphere.

The two largest planets, Jupiter and Saturn, have nearly the same chemical composition as the Sun, with 75% of their mass made up of hydrogen and 25% of it of helium. Due to the fact that both hydrogen and helium are gases on Earth, Jupiter and Saturn are frequently referred to as gas planets. This name, though, is misleading. The gas inside Jupiter and Saturn is squeezed until the hydrogen turns into a liquid because of their size. Both planets should be referred to as liquid planets since compressed, liquefied hydrogen makes up the majority of their mass. A liquid or gaseous planet's interior is gravitationally pulled toward its heavier constituents by gravity.

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The final angular velocity ,  angular displacement,  initial rotational kinetic energy, final rotational kinetic energy and work done on the disk are respectively 25 rad/s, 150 rad, 0.25 Joule, 6.25 Joule, and 6.00 Joule.

Given parameters:

Mass of the disc; m = 0.5 kg.

Initial angular velocity: ω₀ = 5 rad/sec

Mass of inertia; I =  0.02kg.m².

Angular acceleration; α = 2 rad/sec².

1. The disc final angular velocity at 10 second =  ω₀ + α t

= 5 + 10×2 rad/s

= 25 rad/s.

2.  The disc angular displacement of the disc at the end of 10seconds;

d = ω₀t + 1/2 α t²

= 5×10 +1/2 × 2 × 10² rad

= 150 rad.

3.  The initial rotational kinetic energy of the disc = 1/2 I ω₀²

= 1/2 × 0.02× 5² Joule.

= 0.25 Joule.

4. The final rotational kinetic energy of the disc at the end of 10seconds

=  1/2 I ω²

= 1/2 × 0.02 × 25² Joule

= 6.25 Joule.

5. The work done on the disk during the given time = final rotational kinetic energy - initial rotational   kinetic energy

= 6.25 Joule - 0.25 Joule

= 6.00 Joule.

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The spinning down mass , to learn the mass and radius.

What is radius?

The average distance from the planet's physical center to its surface, calculated from a large number of samples, is known as the mean radius of the Earth. Approximately 6,371,000 meters are represented by the value, rearth. This translates to approximately 3,960 statute miles or 6,371 km.

What is mass?

In physics, mass is a numerical representation of inertia, which is a basic characteristic of all matter. The resistance a body of matter offers to a change in its speed or position as a result of the application of a force is what it is in essence.

Let mass of flywheel be m

Initial angular speed of flywheel=500rpm=52.36 rad/s

Mass moment of inertia of flywheel=(1/2)mr^2=0.72m

Initial rotational kimetic energy=(1/2)*0.72m*52.36^2

Work done in coming to rest = 5100J

Therefore,(1/2)*0.72m*52.36^2=5100

Therefore the mass is 5.17 kg.

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The velocity at the maximum height is zero.

Velocity defines the direction of the motion of the body or the item. speed is generally a scalar quantity. Velocity is essentially a vector quantity. It's far the rate of alternate of distance. it is the rate of change of displacement.

Speed is the time rate at which an object is moving alongside a path, while pace is the price and path of an object's motion. Put another way, speed is a scalar value, whilst velocity is a vector.

In easy phrases, velocity is the speed at which something moves in a specific route. as an instance as the speed of a vehicle journeying north on a highway, or the rate a rocket travels after launching. The scalar means absolutely the cost value of the speed vector is constantly be the velocity of the movement.

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A net force of 265 n accelerates a bike and rider at 2. 30 m/s2. The mass of the bike and rider together will be  115.22 Kg

Force = mass * acceleration

mass = Force / acceleration

         = 265 / 2.30

         = 115.22 Kg

The mass of the bike and rider together will be  115.22 Kg

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A 23.0-turn solenoid of length 6.40 cm produces a magnetic field of magnitude 2.10 m at its center. The current in the solenoid is

B=μ[tex]*i*N/L=2.2[/tex]

so [tex]i=2.2* .062 /(31*u)=4.4*10^{-3}[/tex] / μ

[tex]I=4.4*10^(-3) /[/tex] μ

What is Solenoid?

However, The solenoid is a particular type of electromagnet, and its function is to produce.

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The elevator is at rest. rank the of magnitude the forces F1 on floor and F floor on 1 is largest, F1 on 3 is smallest.

Elevator is defined as a vehicle that transports people or cargo vertically using a cable, hydraulic cylinders, or roller tracks. A platform that can be either open or closed, an elevator is used to raise and lower both people and objects to higher and lower floors.

Based on the law of motion If the elevator is accelerating, the weight of the person is larger than real gravity. So a person's weight will increase whether they are going up or down.

Thus, the elevator is at rest. rank the of magnitude the forces F1 on floor and F floor on 1 is largest, F1 on 3 is smallest.

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Answer:

well the force that holds down the sun and the force that when you throw a ball it cases it to come back to you or boomerang or poring a drink or tides or rolling objects

Explanation:

well all of those show the gravity pull sorry if it wasn't helpful

The stated assertion states that r> Ra lengths from the conducting cylinder's axis.

We can determine an object's actual size by learning how far it is from us. The area that an object occupies in the sky can be measured. The distance to an object is then necessary to calculate its real size. An thing appears smaller the farther it is away.

Briefing:

The magnetic force is inversely correlated with the conducting cylinder's axis distance.

The strongest magnetic field Rb = 4.95 cm,

Most minimal gravitational flux = r>Ra

Rb = 4.95 cm

r= 5.40 cm

Ra =7.75 cm

r> Ra

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Answer:

Explanation:

Explanation

PE = mgh

The mass once stated, cannot be altered. You cannot decide that 1/2 down its fall, it becomes 25 kg. The mass is fixed once it has a value.

g for your intents is a constant.  

h is the only thing you can change.

Givens

m = 10 kg

g = 9.81 m/s^2

h = 30 m

Solution

PE = m*g*h                       Substitute the givens into the equation

PE = 10 * 9.81 * 30

PE = 2943 Joules

Note a Joule is made of Kg m^2/sec^2

When an object is in a gravitational field, then it has energy in its gravitational potential energy store.

Gravitational energy or gravitational potential energy is the potential energy that an object with mass has with respect to another object with mass due to gravity. It is the potential energy associated with the gravitational field that is released (converted into kinetic energy) as objects fall toward each other.

Gravitational energy is the potential energy that is stored in an object based on its distance from the Earth. Potential energy is one of the energies stored in an object or matter. Thus, Gravitational energy is one of the form of potential energy. The Earth, the Sun, the planets, and the stars all exert a considerable amount of gravity.

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Answer:

an ideal gas at low temperatures and high pressures.

If the current in a current is reversed in a magnetic field, the direction of the magnetic field and the conductor will also be reversed.

The right-hand rule correctly describes this effect. The current follows the direction the thumb is pointing, but the direction of the magnetic field is dictated by the direction the finger is pointing. If the direction of the current changes, the direction of the magnetic field also changes. When the direction of the current is reversed, the compass needle moves in the opposite direction because the polarity of the magnetic field is reversed. The generated magnetic field is always perpendicular to the direction of the current and parallel to the electromagnets. Therefore, reversing the current will also reverse the direction of the magnetic field.

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At time 0.25 s the driver position is at 0.45 m if he drives the vehicle at an initial speed of 1. 8 m/s.

At t = 0.25 s

Considering horizontal motion of diver vehicle :-

Initial speed, u =  1.8 m/s

Acceleration , a = 0 m/s²

Displacement, s = ?

Time, t = 0.25 s

the equation of motion, s= ut + 0.5 at²

Substituting all the above given values

  s= ut + 0.5 at²

  s = 1.8 x 0.25 + 0.5 x 0 x 0.25²

  s = 0.45 m

so, the position of vehicle will be 0.45 m at an initial speed of 1. 8 m/s.

the complete question is:

A diver runs horizontally off the end of a 3.0-m-high diving board with an initial speed of 1.8 m/s. Given that the diver's initial position is xi=0 and yi=3.0m, find her x positions at the time t = 0.25 s.

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The position on the meter stick is 25 cm.

Solution:

The center of mass of the meter stick will be at 0.5 m and its torque about the pivot point will be T1 = mg(0.5 - 0.3)

T1 = 0.5*9.81*0.2 = 0.981 N-m (clockwise)

So we have to add 2 kg mass on the left side of the pivot so that it has a counter-clockwise torque about the pivot point.

Let us position it at x the its torque about pivot point will be T2 = mg(0.3 - x) = 2*9.81*(0.3 - x)

To support the stick T1 = T2

0.981 = 2*9.81*(0.3 - x)

0.3 - x = 0.05

x = 0.25 m = 25 cm.

The position of the center of gravity is the average position of the total weight of the object. The center of mass is the object's balance point, also represented as the point where all its mass appears to reside. Sticks are measured in two ways. Measure straight from the top of the shaft to the blade or from the top of the shaft to the heel with the shaft up against a wall. Remember If you measure your street shoe stick it will feel about 3-4 inches shorter on the ice.

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Referring to the oscilloscope, the height of the displayed waveform controls the effect.

Thus, the correct option is A.

Аn oscilloscope is а lаborаtory instrument commonly used to displаy аnd аnаlyze the wаveform of electronic signаls. In effect, the device drаws а grаph of the instаntаneous signаl voltаge аs а function of time.

The most common oscilloscope controls аre for аmplitude, frequency, triggering, аnd chаnnels. Once your teаcher hаs helped us аcquire а signаl using the correct chаnnel аnd triggering we will use the аmplitude аnd frequency controls to displаy the chаrаcteristics of the sound being produced. The аmplitude аdjustment of аn oscilloscope controls how tаll а given voltаge will аppeаr on the screen. The purpose of this аdjustment is thаt you cаn see а very lаrge or а very smаll signаl on the sаme screen.

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A line that intersects two or more lines in a plane at different points is called a transversal line

A transversal line, in geometry, passes through two lines in the same plane at two distinct points. Intersection caused by transversal forms several angles. These are corresponding angles, alternate interior angles, alternate exterior angles, and co-interior angles.

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Explanation:

F = ma

30 = 20m

m = 30/20

m = 1.5 kg

The heat energy transferred to achieve this task is conduction heat transfer.

option D is the correct answer.

Heat transfer is defined as the process in which the molecules are moved from the region of higher temperature to lower temperature.

There are three methods of heat transfer process and they include the following;

Heat transfer by conduction is the process of heat transfer from one particle of the medium to another with the particles being in direct contact with each other.

Heat transfer by convection occurs in fluid and involves the actual movement of the liquid molecules.

Heat transfer by radiation is a method of heat transfer that does not require material medium.

Thus, the heat transfer that allowed the oven to heat melt the chocolate is conduction heat transfer while the source of energy of the solar oven is radiation from sun.

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Answer:D is the answer

Explanation:

Observed temperature increases are best represented when it includes the influences of increases in greenhouse gases.

What are greenhouse gases ?

Greenhouse gases are gases in the atmosphere that affect the earth's energy balance. They cause the so-called greenhouse effect. Carbon dioxide (CO2), methane, and nitrous oxide, the best-known greenhouse gases, occur naturally in the atmosphere at low concentrations. However, since the beginning of the last century, its proportion has increased significantly due to various anthropogenic causes.

Besides these trace gases, which occur only in very low concentrations in the atmosphere, water vapor is probably the most important greenhouse gas. However, its ability to absorb water vapor from the air is directly related to temperature, so it only plays a major role with respect to the natural greenhouse effect. Therefore, water vapor contributes little to man-made climate change.

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