21.
Figure 1 shows a person sliding down a zip wire.
Figure 1
Zip wire
Change
in vertical
height
(a) As the person slides down the zip wire, the change in the gravitational potential energy
of the person is 1.47 kJ
Eg=m
The mass of the person is 60 kg
gravitational field strength = 9.8 N/kg
Calculate the change in vertical height of the person.

Answer:

I think that is d option 1.0Nm anticlockwise

The radiation pressure directed at normal incidence onto a perfectly reflecting sheet is 2.71 × 10⁻⁷ Pa

Given that a linearly polarized microwave of wavelength 1.50cm is directed along the positive x axis and the electric field vector has a maximum value of 175V/m and vibrates in the x y plane.

Also, assuming the magnetic field component of the wave can be written in the form B=Bmax sin (k x-Ω t) give values for (f) If this wave were directed at normal incidence onto a perfectly reflecting sheet, we desire to find the radiation pressure.

The radiation pressure for total reflection is given by P = 2I/c where

So, P = 2I/c

P = 2E²/2μ₀c ÷ c

P = E²/μ₀c²

Substituting the values of the variables intot he equation, we have

P = E²/μ₀c²

P = (175 V/m)²/[4π × 10⁻⁷ T/m × (3 × 10⁸ m/s)²]

P = 30625 V²/m²/[4π × 10⁻⁷ T/m × 9 × 10¹⁶ m²/s²]

P = 30625 V²/m²/[36π × 10⁹ Tm/s²]

P = 30625 V²/m²/113.097 × 10⁹ Tm/s²

P = 270.78 × 10⁻⁹ Pa

P = 2.7078 × 10⁻⁷ Pa

P ≅ 2.71 × 10⁻⁷ Pa

So, the radiation pressure directed at normal incidence onto a perfectly reflecting sheet is 2.71 × 10⁻⁷ Pa

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Electron , photon and proton carry energy which is option (a) , (b) ,(c)

Photons are massless, but they have energy [tex]E = hv= \frac{hc}{\lambda}[/tex]

Here 'h' is called Planck's constant .

For electron and proton energy is given by

 [tex]E=\frac{1}{2} \times mv^2[/tex]

Where m is the mass of the particle and v is the speed of particle .

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Answer:

Work=force × distance

=45×15

=675

Explanation:

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Answer:

100 foot

Explanation:

Using the formula for calculating range to calculate the speed first as shown;

U is the speed

theta is the observe angle

g is the acceleration due to gravity.

200 = U²sin 2(45)/9.8

Usin90 = 200 * 9.8

U² = 1960

U = √1960

U = 44.27 m/s

Get the required altitude

Altitude H = u²/2g

H = 44.27²/2(9.8)

H = 1,959.8329/19.6

H = 99.99 feet

Hence the altitude of the rocket to the nearest foot is 100 foot

Thomson could not observe any deflection of the beam due to gravitation.

Cathode ray refers to the beam of electrons that moves from the negatively charged cathode to the positive anode at the other end of the pipe.

J. J. Thomson demonstrated that the identical beam deflections produced tubes with cathodes composed of varied materials and containing a range of gases prior to evacuation.

The gravitational force is approximately 10⁴⁰.

The movement of the light beam shouldn't be impacted because it is 10²⁸ times weaker than the electric force.

Thomson was unable to detect any gravitational beam deflection.

Thus, Thomson could not observe any deflection of the beam due to gravitation.

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Answer: Created Fall 2016 by Ronald Wilson Inductive reasoning uses a set of specific observations to reach an overarching conclusion; it is the opposite of deductive reasoning. So, a few particular premises create a pattern which gives way to a broad idea that is likely true.

Explanation: No explanation lol. But I hope this is helpful!

Answer:

the larger-heavier would fall faster than lighter-smaller ball

Explanation:

Answer:50kg

Explanation:

The correct answer is FM-MF

The crust of the Earth does not naturally contain ferromium. The heaviest element that can be created by neutron bombardment of lighter elements, fermium was first discovered in December 1952 by American scientists from the Argonne National Laboratory near Chicago, Illinois, the Los Alamos National Laboratory in Los Alamos, New Mexico, and The University of California Laboratory in Berkeley. Fermium is the heaviest element that can be synthesized in macroscopic quantities.

We can prove this by saying that if a point's distance from another point is six units, then the distance between those two points will also be six units. Therefore, FM-MF

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Answer:

You should weigh about 16 pounds.

Explanation:

To find this, you need to find your weight and divide it by 6 to find your weight on the moon.

Answer:

Both eggs are identical. The aim is to find out the highest floor from which an egg will not break when dropped out of a window from that floor. If an egg is dropped and does not break, it is undamaged and can be dropped again. However, once an egg is broken, that's it for that egg.

Answer:

oooh thanks

Explanation:

..................

Answer:

awwww thx you are to :)

Explanation:

Answer:

There is a blue sky with clouds

There is cracks in the ground and the ground is brown

There is stuff in the dictance

Explanation:

Hope this helps

Answer:

Parallel circuits :)

Answer:

2.64 m/s

Explanation:

Given that a 600 kilogram great "yellow" shark swimming to the right at a speed of 3 meters traveled each second as it tries to get lunch. An unsuspecting 100 kilogram blue fin tuna is minding its own business swimming to the left at a speed of 0.5 meters traveled each second. GULP! After the great "yellow" shark "collides" with the blue fin tuna

Momentum = MV

Momentum of the yellow shark before collision = 600 × 3 = 1800 kgm/s

Momentum of the tun final before collision = 100 × 0.5 = 50 kgm/s

Total momentum before collision = 1800 + 50 = 1850 kgm/s

Let's assume that they move together after collision. Then,

1850 = ( 600 + 100 ) V

1850 = 700V

V = 1850 / 700

V = 2.64285 m/s

Therefore, the momentum of the shark after collision is 2.64 m/ s approximately

The current in the load will be 10 A.

given,

resistance of the load (R) = 6.5Ω

voltage in the load (V) = 120V

Back emf in the load (E)= 108V

now to measure current we will use the formula

current (I)= {voltage (V)-Back emf (E)}/resistance(R)

now as the speed is halved so will the back electro motive force will be halved.

i.e.

back  electro motive force will be =  108V/2

=54V

now,

substituting this value in the formula we get,

current (I) = (120-54)/6.5

current (I) = 66/6.5

current (I) =10A

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The aqueous humor in a person’s eye exerts a force of 0.295 n on the 1.15-cm2 area of the cornea pressure is this in mm Hg P = 2565.2173 N/m².

Pressure is defined as the normal force F per unit area A over which the force is applied or

P = F / A

Where :

P is the pressure acting on the cornea .

F if the force acting on the cornea .

A is the area of the cornea .

Givens : F = 0.3 N and A = 0.00011 m

Plugging known information to get :

P = F / A

P = 0.295 / 0.000115

P = 2565.2173

P =2565.2173 N/m²

The ciliary body produces aqueous humor, which travels along the uveoscleral pathway from the posterior chamber through the pupil and anterior chamber (shown by dashed lines and arrowheads) to the ciliary muscle and suprachoroidal region.

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I understand the question you are looking for :

suppose the aqueous humor in a person’s eye exerts a force of 0.295 n on the 1.15-cm2 area of the cornea. What pressure is this in mm Hg?

Answer:

Ahmed did more work in lifting the weight than Omar.

Explanation:

Work done can be determined as the product of a force and the distance moved in the direction of the force.

Work done = F x s

In the given question, since the weight is lifted through a height, then the work done equals potential energy.

i.e Work done = Potential energy

                       = mgh

But,

Force = weight = mg

So that,

Work done = Fh

where F is the weight and h is the height.

i. Work done by Omar = Fh

                            = 200 x 2.0

                            = 400

Work done by Omar is 400 Nm.

ii. Work done by Ahmed = Fh

                                     = 200 x 2.1

                                     = 420

Work done by Ahmed is 420 Nm.

Thus, Ahmed did more work in lifting the weight than Omar.

Electromagnetic force can not be considered because it very less as compared to gravitational force.

There are four types of Nuclear Forces :

1. Gravitational force

2. Electromagnetic force

3. Strong nuclear force

4. Weak nuclear force

The force acting between  the sun and the earth is gravitational force it is about

3.54 ×10²²N

Earth rotates around the sun because it is contained in the sun's gravitational field.

Due to the centripetal force Earth doesn't falls into  the sun.

Electromagnetic force can not be considered because it very less as compared to gravitational force. The electromagnetic force between two charged bodies is nearly equal to 10⁵N.

Electromagnetic force can not be considered because it very less as compared to gravitational force.

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Answer:   The greatest force of gravity on the ball will occur at the point when the ball is near to hit the ground ... hope this helps have a good day :P

Answer:

2m/s²

Explanation:

F = 12 N

m = 3kg

a = ?

F = ma

a = F/m = 12/3 = 4 m/s²

when m = 6kg

a = F/m = 12/6

a = 2 m/s²

Answer:

You need a motor and a battery

Explanation:

The currents through 4 ohm, 2 ohm and 5 ohm are 0.42 amp, 0.15 amp and 0.26 amp respectively.

Kirchhoff's Current Law states that no charge is lost and that the total current flowing into a junction or node equals the charge leaving it.

Kirchhoff's Voltage Law states that for any closed network, the voltage around a loop is equal to the total of all voltage drops in that loop and is equal to zero.

Let the current through 4 ohm is I₁.

the current through 2 ohm is I₂.

Applying Kirchhoff's Current Law, current through 5 ohm is I = I₁ + I₂.

Applying Kirchhoff's Voltage Law in two loops we get:

4 I₁ + 5(I₁+I₂) = 3

2I₂ + 5(I₁+I₂) = 1

Hence, I₁ = 0.42 amp

I₂ = - 0.15 amp

I₃ = 0.26 amp

Hence, the currents through 4 ohm, 2 ohm and 5 ohm are 0.42 amp, 0.15 amp and 0.26 amp respectively.

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Although not always practical, Ampere's law is true for all closed channels around a conductor. The integral can be calculated along many different paths, although it is difficult to do so. Think about a path that is circular but not coaxial with a long, straight wire that carries current. If the current in a conductor has enough symmetry to allow the line integral to be reduced to the size of B times an integral, Ampere's law can be used to calculate B.

Ampere's Law is applied to,

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Edwin Hubble was the astronomer which measured the motion of stars in the sky and is therefore denoted as option D.

This refers to an aspect of a science called natural science and is the study of celestial bodies such as the moon, stars etc and the different phenomena which occurs between them.

An astronomer called  Edwin Hubble was responsible for the measurement of the motion of stars through when he was in the process of the formulation of his law which involves the determination of distances to galaxies and quasars which is therefore the reason why option D was chosen as the correct choice.

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Answer:

675J

Explanation:

Given parameters:

Force  = 45N

Distance  = 15m

Unknown:

Work done by Sheila  = ?

Solution:

Work done by a body is the amount of force applied to make a body move through a distance;

         Work done  = Force x distance

 Now;

          Work done  = 45 x 15  = 675J