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Use the formula, Here, T is time period, R is orbit radius G is gravitational constant and is mass of earth.

Given, = 4 × original mass of earth, = 4 × 5.92 × 10²⁴ kg Orbit radius , R = Earth's radius + height of satellite from Earth's surface = 6400 km + 35780 km = 42180 km = 4.2180 × 10⁷ m G = 6.67 × 10⁻¹¹ Nm²/Kg²

Now, T = 2π√{(4.2180 × 10⁷)³/(6.67 × 10⁻¹¹) × (4 × 5.92 × 10²⁴)} = 43309.8 sec

So, T = 43309.8/3600 ≈ 12 hrs

Hence, time to complete revolution by satellite is 12 hrs

The SI unit for hydrostatic pressure is the pascal (Pa), equal to one newton per square metre (N/m2, or kg. m. s−2). This name for the unit was added in 1971; before that, pressure in SI was expressed simply in newtons per square metre

Hydrostatic Paradox. Thehydrostatic paradoxarises from our failure to accept, at first sight, the conclusion published by Blaise Pascal in 1663: the pressure at a certain level in a fluid is proportional to the vertical distance to the surface of the liquid

The scalar product of two vectors A and B is a scalar quantity equal to the product of the magnitudes of the two vectors and the cosine of the smallest angle between them. The scalar product is commutative, A×B = B×A. When we form the scalar product of two vectors, we multiply theparallelcomponent of the two vectors

answer

0.10406 answer the correct answer

Refraction occurs when a wave moves from a material with one density into a medium with a different density. Refraction means that the light waves are bent, or change direction when they enter a new medium. This happens because as the wave enters the new medium it changes speed.

better declaration plz

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Given, power of pump = 2kW =2000W

Time (t)= 60sec

Height (h) = 20m

g = 10m/s2

As you know, power =work done per unit time.

Work done = mgh = m ×10×20 =200m

Therefore, 2000W = 200m/60s

Therefore, m = 600kg

So, the pump can raise 600kg of water in one minute.

thank u

A thermal power station is a power station in which heat energy is converted to electric power. In most of the places in the world the turbine is steam-driven. Water is heated, turns into steam and spins a steam turbine which drives an electrical generator.

Afossil-fuel power plant is one that burnsfossilfuels such as coal, natural gas orpetroleum(oil) to produce electricity.

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low ignition temperature

It is readily available,It is less expensive,It burns easily in air at a moderate rate,It produces a large amount of heat,It can transport easily.It has high calorific value, and.It does not leave behind any undesirable substances.

rule for electrons since they go in the opposite direction to the current). To do this, point your right thumb in the direction that the current travels in the coiled wire in the solenoid and curl your fingers.* The direction your fingers point will determine the direction of the magnetic field created by the current.

Alternately the right-hand-grip rule is easier to use with solenoids. If you wrap your fingers in the direction of the current traveling in the solenoid, your thumb will point in the direction of the North Pole of the magnetic field**.

The solenoid itself is simply a coil of wire with no directional components (e.g. a diode), so it can simply be reversed in the circuit to generate the magnetic field in the opposite direction, or you can reverse the direction of

Nuclear fuels

The main nuclear fuels are uranium and plutonium. These areradioactivemetals. Nuclear fuels are not burnt to release energy. Instead, nuclear fission reactions (where the nuclei in atoms are split) in the fuels release heat energy.The rest of the process of generating electricity is then identical to the process using fossil fuels. The heat energy is used to boil water. Thekinetic energyin the expanding steam spins turbines, which then drive generators to produce electricity.

Advantages

Unlike fossil fuels, nuclear fuels do not produce carbon dioxide or sulfur dioxide.

Disadvantages

Fossil fuels, nuclear fuels arenon-renewable energy resources.

If there is an accident, large amounts of radioactive material could be released into the environment.

In addition, nuclear waste remains radioactive and ishazardous to health for thousands of years. It must be stored safely.

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let speed of man be v. from principle of conservation of momentum, mu = Mv, v=mu/M, let time taken to reach ground be 't'. ut=h, t=h/u. therefore man moves vt=vh/u=mh/M, therefore, answer=h+(mh/M) =h(1+(m/M))

But the man is standing. How can he acquire velocity?

Oh sorry I didn't notice it is a gravity free system. Sorry for the inconvenience.

R^2 = A^2 +B^2 + 2ABCOSX

R^2 = A^2 +B^2 + 2AACOSX

R^2 = 2A^2 + 2A^2COSX

R^2 = 2A^2(1+COSX)

R^2 = 2A^2(2(COSX/2)^2)

( Because : {COS2X= 2(COSX)^2-1} )

R^2 = 4 A^2 (COSX/2)^2

R = 2ACOSX/2

Here,

M = 120 kg

u = 600 m/s

dm/dt = -1 kg/s

negative because mass is decreasing with time

From Rocket propulsion analysis we have

mdv = -udm

=> dv/dm = -u/m ---1.

We know from Momentum equation

Let m be the mass of the rocket at an instant and v its velocity at instant

F = d/dt(mv)

= v(dm/dt) + m(dv/dt)

Using chain rule

dv/dt = (dv/dm)(dm/dt)

F = v(dm/dt) + m(dv/dm)(dm/dt)

Using eqn. 1

= v(dm/dt) + m(-u/m)(dm/dt)

= v(1) – u(-1)

= v + u

At the beginning velocity of the rocket was 0,

v = 0

F = u = 600

So initial thrust = 600 N

Initial acceleration = 600/120 = 5 ms-2

option 2 is the best or correct answer

Series has one path throughout which the electrons flow but parallel is divided into 2 or more paths so opposition decreases in parallel combination due to division of path. So series has more resistance power.

Series has one path throughout which the electrons flow

but parallel is divided into 2 or more paths so opposition decreases in parallel combination due to division of path. So series has more resistance power.

tq

In orderto convert a Galvanometer into voltmeter, a very high resistance known as "series resistance" is connected in series with thegalvanometer.

In orderto convert a Galvanometer into voltmeter, a very high resistance known as "series resistance" is connected in series with thegalvanometer.

Hence, first option is correct.

BothMyopia(short-sightedness) andHypermetropia(long-sightedness) are common eye conditions that are occur when light does not focus on the retina of the eye. Both conditions are easily corrected using prescription glasses or contact lenses or in mild cases by laser eye surgery

Ans :- We require at least 6 resistor to get 1.5 ohm equivalent resistance from 2 ohm resistor.

2 resistor(2 ohm) in parallel form 1 ohm.

4 resistor(2 ohm) in parallel form 0.5 ohm.

Then connect them in series, we get 1.5 ohm equivalent resistance.

2 resistances are in parallel hencethe resultant will be 1/R+1/R

=R/2it is again in parallel with Rhence2/R+1/R=3R/3=RInow this in series with R again hence R+R=2R

correct choice is (a) option

can u explain

i think 4 is correct

plz tell me the correct answer

4 is not in the option

correct answer is 10

ok thanx for telling the answer

can u plz capture it using flash?