In a race, you run past another runner and your speed relative to them is 0.3m/s. If you
are running at 8.2m/s, how fast is the other runner running? Give your answer to two
significant figures.

Answer:

Explanation:

The picture is cut off so the wrecking ball and its path are not shown. It would be better if the whole picture is available.

Based on the written info, at the bottom of the path, the wrecking ball is moving at 10m/s.

The centripetal acceleration = velocity^2 / radius

= 10^2 / 25

= 100 / 25

= 4m/s^2

The centripetal force = mass * centripetal acceleration

= 600*4

= 2400N

As the ball is moving horizontally at the bottom, net vertical force is zero.

So Tension force in cable = Wrecking ball weight + Centripetal force

= 600*g + 2400

= 6000 + 2400; assuming g is 10m/s^2

= 8400N

Explanation:

The time period of a simple pendulum is given by :

\(T=2\pi \sqrt{\dfrac{L}{g}}\)

L is length of the pendulum and g is acceleration due to gravity

It is very much clear that the time period depends on the length of the pendulum.

In this problem, there are 100 simple pendulums in a room having identical bobs which are displaced to different extents but only 25 of these pendulums have different time periods. The only reason for 25 pendulums having different time periods is that they have different lengths than the other 75 pendulums.

When an object is moving at a constant velocity, the acceleration of the object is zero because the change in the velocity of the object is zero.

Acceleration is defined as the change in velocity per change in time of motion.

The acceleration of an object is calculated as;

\(a = \frac{\Delta v}{\Delta t } = \frac{v_2 - v_1}{t_2 - t_1}\)

When an object is moving at a constant velocity, the change in the velocity of the object is zero.

\(v_2 = v_1\\\\a = \frac{v_2 - v_1}{t_2 -t_1} = \frac{v_2 - v_2}{t_2 -t_1} = 0\)

Thus, we can conclude that when an object is moving at a constant velocity, the acceleration of the object is zero because the change in the velocity of the object is zero.

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Answer:

Infrared

Explanation:

Infrared radiation is the form of light that is invisible to eye but can be felt as warmth.

Electromagnetic radiation has gamma rays, ultraviolet rays, x- rays , visible light and infrared radiation, etc.

The heated surface usually emits infrared radiations .They form a continuous spectrum.

Infra red radiation are used in different processes such as heat sensors, thermal imaging and night vision equipment.

Broadly they can be divided into three group near, middle and long infrared radiations.

These radiations can be seen with the eyes with special equipment or under certain conditions.

Answer:

It has to be the "New Moon" because that is when the moon is between the sun and the earth.

A lunar eclipse can occur when the earth is between the sun and the moon.

the force between the two wires if they are separated by 2.50 cm is 0.525 N.

Given that force F between two parallel wires carrying electric currents is inversely proportional to the distance d between the wires and that a force of 0.750 N exists between wires that are 1.75 cm apart and that we are supposed to find the force between them if they are separated by 2.50 cm.

Let the initial force be F₁ and the initial distance be d₁.

Therefore, we can write the relationship between force and distance as;

F₁d₁ = F₂d₂

Where

;F₁ = 0.750 N (initial force)

d₁ = 1.75 cm (initial distance)

F₂ = ? (force at new distance)

d₂ = 2.50 cm (new distance)

Let us find F₂;F₁d₁ = F₂d₂F₂ = F₁d₁/d₂

Now substitute the values we know;

F₂ = (0.750 N x 1.75 cm) / 2.50 cmF₂ = 0.525 N

Therefore, the force between the two wires if they are separated by 2.50 cm is 0.525 N.

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1.  The dispersion angle can be calculated as follows:

The angle of refraction for red and violet light using Snell's Law. For red light:

sin(41.00°)/1.638 = sin(θ)/1, where θ is the angle of refraction.

Solving for θ, we get θ = 24.42°.

Similarly, for violet light:

sin(41.00°)/1.668 = sin(θ)/1,

solving for θ, we get θ = 24.07°.

The dispersion angle is then the difference between these two angles:

Δθ = θ_violet - θ_red = 24.07° - 24.42° = -0.35°.

Therefore, the dispersion angle is -0.35°.

2. Let w be the width of the beam at the bottom of the block, as measured along the bottom surface. Then, for red light:

sin(24.42°)/1 = sin(θ)/1.638,

solving for θ, we get θ = 16.68°.

Using the same approach for violet light, we get θ = 16.48°.

The width of the beam at the bottom of the block is then:

w = 13.5 cm × tan(16.68°) + 13.5 cm × tan(16.48°) = 6.69 cm.

Therefore, the width of the beam at the bottom of the block is approximately 6.69 cm.

3.  When the rainbow-colored beam emerges from the bottom of the block, the exiting rays of light are once again refracted at the air-glass interface, and they spread out further due to the dispersion of the glass.

Dispersion refers to the phenomenon of a wave or radiation being separated into its component frequencies as it passes through a medium. This occurs because different frequencies of the wave travel at different speeds through the medium, causing them to spread out and separate.

One common example of dispersion is the separation of white light into its constituent colors when it passes through a prism. The different colors of light are refracted differently, causing them to separate into a rainbow-like spectrum. Dispersion is also an important phenomenon in the study of materials, particularly in optics and acoustics. In materials, dispersion can result in the absorption or reflection of certain frequencies, affecting the overall properties of the material.

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Answer:

71 % eff

Explanation:

if 50 out of 70  watt goes to making light

50/70 = 71 %

Answer:

m = 4

Explanation:

We have,

You apply a force of  600 N to the branch  which acts as a lever. It means it is input force, IF = 600 N

The rear of the truck  weighs 2,400 N. It means it is output force, OF = 2400 N

The ratio of output force to the input force is equal to the mechanical advantage of the lever arm. It is given by :

\(m=\dfrac{2400}{600}\\\\m=4\)

So, the mechanical  gain of the lever arm is 4.

Answer:

its B

Explanation:

Answer:

It's B, No, because the grains are arranged in thin, parallel layers.

Explanation:

I literally took the test 5 seconds ago and it was right.

Answer:

c isthe answer if not see my profile m e. e. t me I will explain u

This can be expressed as,T2 = (M + m)aT1 = Mg/2where,T2−T1= (M + m)a − Mg/2 Solving the above equations will give the value of α and then we can find out the final velocity of the platform.

Here's the solution to the given problem: Let the origin of our coordinate system be located at the center of the platform. We can assume that there is no friction between the platform and the ground. If v  Rw, the woman will collide with the center of the platform after the platform stops moving because it is not able to move with the required speed to reach the center of the platform before it stops. The net torque about the origin, assuming that the angular momentum is conserved, is Iα = τ, or, assuming that the angular momentum is conserved,T2−T1=IwoR2wR2+mr2αT2 = Mg/2 + Mv/RT1 = (M + m)g/2Let a be the speed of the platform just after the woman reaches the center, which is given by a = v + αr. This can be expressed as,T2 = (M + m)aT1 = Mg/2where,T2−T1= (M + m)a − Mg/2Solving the above equations will give the value of α and then we can find out the final velocity of the platform.

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The wavelength of the emitted photon is 5.48 x 10^-17 m, and the mass of the particle is 1.05 x 10^-26 kg.

The energy levels of a particle in a one-dimensional box are given by:

En = (n^2 * h^2)/(8mL^2)

where n is the quantum number, h is Planck's constant, m is the mass of the particle, and L is the length of the box.

We are given En = 51.5 MeV and En+1 = 74.2 MeV, and L = 10 fm.

Using En, we can find the mass of the particle:

m = (n^2 * h^2)/(8L^2 * En)

m = (5^2 * (6.626 x 10^-34 J s)^2) / (8 * (10 x 10^-15 m)^2 * (51.5 x 10^6 eV) * (1.602 x 10^-19 J/eV))

m = 1.05 x 10^-26 kg

Now, we can find the wavelength of the photon emitted in the n+1 to n transition using the formula:

ΔE = Efinal - Einitial = hc/λ

where ΔE is the energy difference between the two levels, h is Planck's constant, c is the speed of light, and λ is the wavelength of the emitted photon.

ΔE = En+1 - En = 74.2 MeV - 51.5 MeV = 22.7 MeV

Converting MeV to joules:

ΔE = 22.7 MeV x (1.602 x 10^-13 J/MeV) = 3.63 x 10^-12 J

Plugging in the values, we get:

λ = hc/ΔE

λ = (6.626 x 10^-34 J s) * (3.00 x 10^8 m/s) / (3.63 x 10^-12 J)

λ = 5.48 x 10^-17 m

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The mass of the counterweight needed to balance the truck is approximately m = 670 kg.

To balance the truck on the incline, the gravitational forces on both sides of the pulley system must be equal. The gravitational force on the truck is given by F_truck = M * g, where M is the mass of the truck (1340 kg) and g is the acceleration due to gravity.

The gravitational force on the counterweight is given by F_counterweight = m * g, where m is the mass of the counterweight. Since the pulleys are frictionless and massless, the tension in the rope connecting the two sides is the same. Therefore, we can equate the gravitational forces:

M * g = m * g

Simplifying, we find:

m = M / 2 = 1340 kg / 2 = 670 kg.

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Answer:

No he's not correct. Current is the rate of flow of charge. 1 Ampere is the amount of 1 coulomb of charge that flows per second. 10 Ampere would then be 10 coulomb of charge flowing in one second.

The  reaction forces are as follows:

Reaction forces are the force which act in an opposite direction to an applied force.

According to Newton's third law of motion, action and reaction are equal but oppositely-directed.

Considering the given forces, the reaction forces are as follows:

A baseball bat hits a ball = the reaction force is that of the ball hitting the bat

A bowling ball pushes up against the pins = the pins pushing against the bowling ball

Air particles push outward against a balloon = the walls of the balloon pushing against the air particles

During an earthquake, tectonic plates move = the weight of the tectonic plates.

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Answer:

-Relative refractive index– It is the ratio of speed of light in one medium to the speed of light in another medium

-Absolute refractive index– It is the ratio of light in vacuum to the speed of light in another medium.

Explanation:

Answer:

1000 meters, 200 meters

Explanation:

Given: Vi = 100 m/s and a = -5 m/s^2

From uniformly accelerated equation:  v = Vi + a t

then substitute

0 = 100 -5 t

t = 20 seconds

to go from 100 to 0 at -5m/s^2

d = Vi (20) - (1/2)(5)(20)^2

d = 100 (20) - 2.5(400)

= 2000 - 1000

= 1000 meters to stop, runs 200 meters beyond the end of the runway into the harbor where he strikes a passenger ferry.

Therefore, Weber is the unit of magnetic flux. Magnetic flux density (B) is measured in tesla (T). option 1

The SI unit for magnetic flux is Weber. Magnetic flux is a measure of the amount of magnetic field passing through a given area. It is expressed in Weber (Wb) which is the SI unit of magnetic flux.

The magnetic flux passing through a surface is given by the formula

ϕ = B.A

where B is the magnetic field and A is the area of the surface.

A magnetic field of one Tesla (1 T) passing through an area of 1 m2 perpendicular to it produces a flux of 1 Wb.

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Answer:

12 meters and 2 n

Explanation:

16 -  u = 6 (8.0 + 11)

Answer:

Explanation:

B. Check conversions between units using units only.

Answer:

5 m/s^2

Explanation:

Acceleration is change in velocity  /  change in time

   Accel = 25 m/s  /  5 s = 5 m/s^2

The net force acting on the 7-kg block is 77 N (85 N - 8 N). Using the formula\(a = F/m,\) the acceleration of the block is 11 m/s² (77 N / 7 kg).

To find the acceleration of the block, we need to use Newton's second law, which states that the net force acting on an object is equal to its mass times its acceleration (Fnet = ma).
In this case, the horizontal force pulling the block is 85 N, but there is also a frictional force acting in the opposite direction of motion, which is 8 N. Therefore, the net force acting on the block is:
\(Fnet = 85 N - 8 NFnet = 77 N\)
We know that the mass of the block is 7 kg, so we can plug these values into the equation:
Fnet = ma
\(77 N = 7 kg x a\)
Solving for acceleration (a), we get:
\(a = 11 m/s^2\)
Therefore, the acceleration of the block is 11 m/s^2.

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Answer:

The time between the emission of the wave and it's reception was 0.4 seconds.

Explanation:

The sound wave emitted by the sonar traveled from the boat to the fishes and came back, therefore the distance of it's total route is twice the distance from the boat to the fishes. We can apply the average speed formula in order to solve this problem, this is done below:

\(\text{speed} = \frac{\text{distance}}{\text{time}}\)

We were given the distance traveled by the wave and it's speed, therefore we can solve for the time:

\(\text{time} = \frac{\text{distance}}{\text{speed}}\\\\\text{time} = \frac{(2*300)}{1500}\\\\\text{time} = \frac{600}{1500} = 0.4 \text{ s}\)

The time between the emission of the wave and it's reception was 0.4 seconds.

This motion of the balloon is an example of buoyancy, which is the upward force exerted by a fluid on an object immersed in it.

When the balloon is neutrally buoyant, it means that the weight of the balloon and the weights attached to it is equal to the weight of the water displaced by the balloon.

If you push the balloon down to a greater depth and then release it, the balloon will rise back up to its original position.

This is because the balloon is still partially inflated and contains air, which is less dense than water. When you push the balloon down, the water pressure compresses the air in the balloon, causing it to become smaller in size.

When you release the balloon, the compressed air expands and pushes the balloon upwards towards the surface of the water.

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Answer:

C. Law Of Conservation Of Mass

Explanation:

In this scenario, this would occur due and is explained by the Law of Conservation of Mass. This law basically states that the mass that exists during and after a chemical reaction must remain the same, assuming that the reaction is taking place in a closed environment where no loss of mass is occurring. This means that if the reaction is in a closed environment the mass should not change whatsoever even if it is not in the same form or substance as it was before the reaction occurred.

Answer:

Explanation:

A simple pendulum consists of a mass (usually represented as a small object or bob) attached to a string or rod of negligible mass. The mass is free to swing back and forth under the influence of gravity.

In the figure, the point of suspension is denoted by "O," and the mass (bob) is represented by the small circle. The string or rod is represented by the vertical line connecting the point of suspension to the bob.

Amplitude:

The amplitude of a pendulum refers to the maximum displacement or swing of the bob from its equilibrium position. In the figure, the amplitude can be represented by the angle formed between the vertical position and the position of the bob when it swings to its maximum distance on one side. It is usually denoted by the symbol "A."

Effective Length:

The effective length of a pendulum refers to the distance from the point of suspension to the center of mass of the bob. It represents the distance over which the mass swings back and forth. In the figure, the effective length can be measured as the length of the string or rod from the point of suspension to the center of the bob. It is usually denoted by the symbol "L."

It is important to note that the amplitude and effective length of a simple pendulum affect its period of oscillation (the time taken for one complete swing). The relationship between these parameters and the period can be described by mathematical formulas.

Overall, the simple pendulum is a fundamental concept in physics and provides a simplified model for understanding oscillatory motion and the principles of periodic motion.

Answer:

The recurve bows

Explanation:Vote brainliest plz

if a child swinging to and fro on a playground swing stand up, her time for a to and fro swing is unchanged. The correct option is b.

When a child is swinging to and fro on a playground swing, their time for a to and fro swing is determined by the length of the swing and the force of gravity. The child's weight provides the necessary force to move the swing back and forth. When the child stands up on the swing, their weight does not change, and neither does the length of the swing.

Therefore, the force of gravity acting on the swing remains constant, and the time for a to and fro swing is also unchanged. However, standing up on the swing may affect the amplitude of the swing, which is the distance traveled by the swing from one side to the other.

Therefore the correct option is b.

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