a waddling armadillo of mass 500kg moves at 5 m/s. how much kinetic energy does it have?

In the freezing physical change, when 210.0 g of water a 0 degrees freezes into ice, it gives off 71.0 kJ of heat.

It is a physical change in which liquids give off heat to form solids.

We have 210.0 g of water at 0°C. We can calculate the amount of heat given off when it freezes into ice using the following expression.

Q = ΔH°fus × m

Q = 0.334 kJ/g × 210.0 g = 70.1 kJ

where,

In the freezing physical change, when 210.0 g of water a 0 degrees freezes into ice, it gives off 71.0 kJ of heat.

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The maximum kinetic energy of the ejected electrons will be 0.71 eV.

The kinetic energy (KE) of electrons is defined as the product of one-half of the mass of the electron to the square of the velocity at which electrons spin in orbit.

Given data;

λ(Wavelength)= 400 × 10⁻⁹ m

Φ(Work function)=2.4 eV

c(Speed of light)= 3 ×10⁸ m/sec

h(Constant) = 6.626 * 10^-34

[tex]\rm \phi = 2.4 eV = 2.4 \times 1.6 \times 10^{-19} \\\\ \rm \phi =3.84 \times 10^{-19} \ J[/tex]

The maximum kinetic energy is found as;

[tex]\rm KE= \frac{hc}{\lambda} - \phi \\\\ KE= \frac{6.64 \times 10^{-34}}{400 \times 10^{-9}} -3.84 \times 10^{-19} \\\\ KE=1.14\times 10^{-19} \ J[/tex]

Unit conversion:

1 eV = 1.6 * 10⁻¹⁹ j

1 J=1/( 1.6 * 10⁻¹⁹) ev

KE=0.71 eV

Hence, the maximum kinetic energy of the ejected electrons will be 0.71 eV.

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The circuit change when a wire is added is, an open circuit occurs and makes all bulbs turn off.

A closed circuit is a type of circuit connection in which the wire connection is complete and current flow occurs, turning the light bulbs on in the process.

An open circuit is a type of circuit connection in which the wire connection is incomplete and current cannot flow, turning off the light bulbs.

Thus, the circuit change when the wire is added is, an open circuit occurs and makes all bulbs turn off.

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An object's acceleration if it is moving and comes to a stop in 5 s will be  8 m/s².

Acceleration is defined as the rate change of velocity with time.

acceleration a = (Δv) / (Δt)

An object is moving with initial velocity u = 40 m/s and it comes to stop, then its final velocity  v= 0 m/s.

Time taken for the change in speed t=5s.

The acceleration is given by

a = (40 -0)/ 5

a = 8 m/s²

Thus, the object's acceleration is  8 m/s².

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According to the universal law of gravitation, the force due to gravity is a. inversely proportional to the square of the distance between objects.

Newton's law of universal gravitation states that objects are attracted to each other in the universe with a force directly proportional to the product of their masses and inversely proportional to the square of their distance apart.

The equation that represents this law is;

F = G × M1M2 ÷ r∧2

Where,

F is the gravitational force acting between two objects

M1 and M2 are the masses of the objects

r is the distance between the centers of their masses

G is the gravitational constant.

Thus. according to the universal law of gravitation, the force of gravity is inversely proportional to the square of the distance between objects.

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The voltage across the resistor increases because extra electron gained by the LDR when the light is shone on it.

Increase in the voltage can occur due to some of the following reasons.

From Ohm's law voltage is directly proportional to current flowing in a circuit.

V ∝ I

The voltage across the resistor increases because extra electron gained by the LDR when the light is shone on it.

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(a) The force required to remove the sheet increases with increase in speed due to change in magnetic flux.

(b) The area in the magnetic field changes as the sheet is being put in between the poles. Thus, a force would be required to put the sheets.

When the sheet is pulled out, from the electromagnet there is change in magnetic flux given as follows;

Ф = BA

where;

emf = dФ/dt

F = qVB

Thus, the force required to remove the sheet increases with increase in speed due to change in magnetic flux.

Also, the area in the magnetic field changes as the sheet is being put in between the poles. Thus, a force would be required to put the sheets.

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Answer:

E......1,800 meters

Explanation:

distance = speed × time

convert 1 min to seconds because speed is give in meters per seconds so it's which is 60 seconds

Then...60 ×30 = 1,800

Given that 1 ounce equals 28.35 grams, the value of 14.600 ounces in grams is approximately 413.9g.

Note that:

1 ounce = 28.35 grams

Given that;

Since 1 ounce = 28.35 grams, 14.600 oz will be;

14.600 oz = ( 14.600 × 28.35) grams

14.600 oz = 413.9g

Given that 1 ounce equals 28.35 grams, the value of 14.600 ounces in grams is approximately 413.9g.

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The magnitude of the angular acceleration of the magnetic disk is determined as 35 rad/s².

The angular acceleration of the disk is determined from the principle of conservation of angular momentum as follows;

τ = Iα

where;

α is angular acceleration

I is moment of inertia of the disk

I = 0.5MR²

I = 0.5 x 0.2 x 2²

I = 0.4 kgm²

τ = Iα

α = τ/I

α = (14)/(0.4)

α = 35 rad/s²

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The magnetic and electrostatic can be either attractive or repulsive. The correct option is C.

A push or pull that an object experiences as a result of interacting with another item is known as a force. Every time two items interact, a force is exerted on each of the objects.

Non-contact forces, such as electrostatic forces, pull or push on objects without actually making contact with them.

When certain materials are rubbed together, a phenomenon known as "charge" can be transferred from one surface to another.

One of the four fundamental forces of nature, the electromagnetic force, results in the magnetic force, which is brought about by the motion of charges.

When two charge-containing objects move in the same direction, a magnetic attraction pulls them together.

Thus, the correct option is C.

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Hello!

We can use the following equation for the potential difference between two parallel plates given an electric field and separation distance:
[tex]V = Ed[/tex]

V = Potential Difference (? V)
E = Electric field strength (100.0 N/C)

d = distance between places (0.02 m)

Plug in the values and solve.

[tex]V = (100)(0.02) = \boxed{2 V}[/tex]

Answer:

c

Explanation:

wavelength shorter means energy is higher

the wavelength

radio waves>microwave>infrared rays>gamma rays

Answer:

55 kg

Explanation:

Formula :

Force = mass × acceleration

=========================================================

Given :

⇒ Force = 220 N

⇒ acceleration = 4 m/s²

===========================================================

Solving :

⇒ 220 N = mass × 4 m/s²

⇒ mass = 220/4

⇒ mass = 55 kg

Answer:

f = 1.18 x 10¹¹ Hz

Explanation:

The equation used to find frequency is:

f = c / w

In this form, "f" represents the frequency (Hz), "c" represents the speed of light (3.0 x 10⁸ m/s), and "w" represents the wavelength (m).

Since you have been given the value of the constant (c) and wavelength, you can substitute these values into the equation to find frequency.

f = c / w                                                      <---- Formula

f = (3.0 x 10⁸ m/s) / w                                 <---- Plug 3.0 x 10⁸ in "c"

f = (3.0 x 10⁸ m/s) / (2.55 x 10⁻³ m)            <---- Plug 2.55 x 10⁻³ in "w"

f = 1.18 x 10¹¹ Hz                                         <---- Divide

Answer:

18 000 m/ s

Explanation:

speed = wavelength * frequency

speed =  1.2  * 15 000 = 18 000 m/s

Answer:

Supplementary units are the dimensionless units that are used along with the base units to form derived units in the International system.

Explanation:

Since they have no units under SI system, they can be considered dimensionless.

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Answer:

306J

Explanation:

The formula for kinetic energy is given as ½mv².

Using this, we get our answer by substituting the values into the formula.

½ × 0.145kg × 65m/s

= 306.31J

can be rounded off to 306J

The spectral type is B, the temperature is 18,000, the absolute magnitude is 0 and the luminosity is 100.

The value of luminosity is independent of an observer's distance from an object since it is an absolute measure of radiant power.

Astronomers commonly express an object's brightness in terms of solar luminosities, with one solar luminosity equaling the luminosity of the Sun.

Hence, the spectral type is B, the temperature is 18,000, the absolute magnitude is 0, and the luminosity is 100.

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Answer:

See below

Explanation:

East components are   10    and    12 cos 30   = 20.392 m/s

North component =  12 sin 30 = 6 m/s

Resultant velocity = sqrt ( 20.392^2 + 6^2) = 21.26 m/s

  direction   arc tan   (6/20.392) = 16.4 degrees N of east

The actual question should be did the sound waves escape room?

Yes they can escape the room

From the calculation, Sheila’s velocity immediately after she is thrown from the bike is 5.7 m/s.

Momentum is the product of mass and velocity. We know that the momentum before collision is equal to the momentum after collision.

Hence;

Momentum before collision = 340 kg • m/s.

Momentum after collision = 60v

Thus;

340 kg • m/s = 60v  kg • m/s

v = 340 kg • m/s/60 Kg

v = 5.7 m/s

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Answer:

Explanation: RADIUS OF EARTH = 6400X1000m =

ACC DUE GRAVITY ABOVE SURFACE OF EARTH = g' =2.45 m/s^2

ACC DUE GRAVITY ON SURFACE OF EARTH =g= 9.8 m/s^2

A/C TO FORmULA

g'/g=1-2h/Re

g'/g +2h/Re = 1

2h/Re =1- g'/g

2h= (1- g'/g)Re

2h=(1-2.45 /9.8)

6400X1000

2h = (0.75)6400X1000

2h = 4800000

h= 2400000

m

The direction of the angular velocity of the minute hand of a wall-clock is perpendicular to the wall and directed inwards.

The passenger slides away from the centre of the curve.

The angle θ which a cyclist should make with the vertical while taking a circular turn of radius r with velocity v given by

tan θ = v^2/rg

Sharper the curve, smaller is the radius and greater is the value of 0.

The  motion of the ball on the frictionless ramp is defined by increasing translational speed with non zero angular speed. The correct option is C.

When a body is moving on a circular track, the speed of the particle is called as the angular speed.

When a ball is rolling without slipping, the motion is both translational and rotational. At point of contact at rest, the velocity is zero. The ball rolls without slipping only if the ball moves with zero speed at point of contact.

On the inclined part, the gravity acts straight downward. Velocity remains constant, ramp pushes back the ball and so the ball pushes ramp. There will be no acceleration and velocity remains constant. The angular speed is directly proportional to the linear velocity.

Thus, the correct option is C.

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Nuclear fusion and fission involve changes in the nucleus of atom, but nuclear fission is  most  in employed nuclear power plants around the world whereas fusion occurs on the sun.

Nuclear fission is a reaction in which the nucleus of large atoms are split into nuclei of two or more smaller atoms.

Nuclear fusion is a reaction in which nuclei of two or more smaller atoms are combined to give an atom of larger nucleus.

Large amounts of energy are involved in both reactions.

The Sun produces energy by nuclear fusion.

However, the most commonly employed method in nuclear power plants is nuclear fission because the necessary conditions required for nuclear fusion have not being developed currently.

Therefore, nuclear fusion and fission involve changes in the nucleus of atom, but nuclear fission is  most  in employed nuclear power plants around the world whereas fusion occurs on the sun.

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Answer:

wave length is 1.2m

Explanation:

since formula of wave length is v/f

v(speed of sound in air at stp is 300ms^-1)

f(frequency 250hertz)

then wave length is 300÷250 which give 1.2m

Sound waves with a constant frequency of 250 hertz are traveling through air at stp. what is the wavelength of the sound waves is 1.32 m.

Wave is is a disturbance in a medium that carries energy as well as momentum . wave is characterized by amplitude, wavelength and phase. Amplitude is the greatest distance that the particles are vibrating. especially a sound or radio wave, moves up and down. Amplitude is a measure of loudness of a sound wave. More amplitude means more loud is the sound wave.

Wavelength is the distance between two points on the wave which are in same phase. Phase is the position of a wave at a point at time t on a waveform. There are two types of the wave longitudinal wave and transverse wave. Longitudinal wave : in which, vibration of the medium (particle) is parallel to propagation of the wave. Sound wave is a longitudinal wave. Transverse wave : in which, vibration of the medium (particle) is perpendicular to propagation of the wave.

speed of the wave,

c = νλ

330 m/s = 250λ

λ = 330/250 = 1.32 m

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The raising of window blinds is changing the amount of work done because work is easier by changing the direction of the force.

Work done refers to the product of component of a force in the direction of distance and the magnitude of this distance.

According to this question, a woman raises window blinds by pulling down on the cord.

The work done on the blind is made easier because load is relieved by changing the direction of the force.

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Problem 2

Answer: Choice D only

Explanation:

Let's go through the list of possible answers

Answer:

current

Explanation:

According to ohm’s law, resistance is equal to voltage divided by current.

Answer:

According to ohm’s law, resistance is equal to voltage divided by current.

Explanation:

R = resistance

V = voltage

I = current

R = V/I

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