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3 years ago

Find the magnitude of pressure in Pascal of 150N that acts normally on area. Of 0.25m2

Physics

1 answer:

ycow [4]3 years ago

8 0

Answer with Explanation:

When solving a problem in math, chemistry or physics, it is necessary to understand all the words and their definitions. If not, start with finding out their meanings, one by one.

Here the key word to know is pascal, (P), which is a unit of measure for pressure, defined as

pressure = Force / applied area

1 pascal = 1 newton / square metre or

1 P = 1 N/sq.m.

Here, we have been given:

Force = 150 N

Area = 0.25 m^2.

Thus the pressure

= Force / Area

= 150 N / 0.25 m^2

= 150/0.25 N/m^2

= 600 pascals.

[ note that the abbreviations are written in capitals, while the full words, units of measurement, are written without capitalization, since they are no longer proper names]

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A battery is connected to the two ends of a conducting rod and the current through it is measured.a) Another rod, made of the sa

IceJOKER [234]

Answer:

a) - the resistance is proportional to the length of the metal

- a thicker rod, since resistance decreases with increasing area

b) The current is proportional to the area so this is the factor that is influenced by the electric field

Explanation:

a) When the rod is connected to the rod an electrical circuit described by the expression is formed

V = I R

I = V / R

The resistance of the rod is

R = ρ L / A

Where ρ is the resistivity of metal, L Longitud and A cross section.

If a higher current is measured when the other rod is connected, it implies that the resistance has decreased. To have a decrease in resistance you have two possibilities

- use a shorter rod, since the resistance is proportional to the length of the metal

- Use a thicker rod, since resistance decreases with increasing area, remember that the area of a circle is

A = π R²

Therefore, small increases in the diameter of the rod could give great changes in resistance.

b) The current is defined with the charge that crosses a surface per unit of time, when the electric field increases the electrons feel a greater force, therefore the current increases.

The charge number on a wire is

Q = q n $v_{d}$ Δt A

So up to date is

I = q n When the rod is connected to the rod an electrical circuit described by the expression is formed

V = I R

I = V / R

The resistance of the rod is

R = rho L / A

Where rho is the resistivity of metal, L e; Long and A cross section.

If a higher current is measured when the other rod is connected, it implies that the resistance has decreased. To have a decrease in resistance you have two possibilities

.- use a shorter rod, since the resistance is proportional to the length of the metal

. - Use a thicker rod, since resistance decreases with increasing area, remember that the area of a circle is

A = pi R2

Therefore, small increases in the diameter of the rod could give great changes in resistance.

.b) The current is defined with the charge that crosses a surface per unit of time, when the electric field increases the electrons feel a greater force, therefore the current increases.

The load number on a wire is

Q = q n $v_{d}$ Dt A

So current is

I = q n v_{d} A

The drag speed (v_{d}) is constant in the materials, it depends on the purity and imperfections, so a change in the length does not significantly change the current.

The current is proportional to the area so this is the factor that is influenced by the electric field

The drag speed (vd) is constant in the materials, it depends on the purity and imperfections, so a change in the length does not significantly change the current.

The current is proportional to the area so this is the factor that is influenced by the electric field

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3 years ago

How much power does an Ox pulling a plow 20 m cross a field, exerting 120J of work over a period of 15 s?

Aleksandr-060686 [28]

Answer:

Explanation:

Given parameters:

Distance covered = 20m

Work done = 120J

Time = 15s

Unknown:

How much power does the Ox exerts = ?

Solution:

Power is the rate at which work is being done

Power = $\frac{Work done }{time}$

Power exerted by ox = $\frac{120}{15}$ = 8W

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3 years ago

Calculate the Kinetic energy of an object with a mass of 15kg while sitting on a shelf that is 20m high.

SOVA2 [1]

Kinetic energy is energy of motion. If the object is sitting still, then it has no kinetic energy. It doesn't matter what its mass is, or how high the shelf is.

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3 years ago

A rocket in deep space has an exhaust-gas speed of 2000 m/s. When the rocket is fully loaded, the mass of the fuel is five times

notka56 [123]

Answer:

$v_{f}$ = 1,386 m / s

Explanation:

Rocket propulsion is a moment process that described by the expression

$v_{f}$ - v₀ = $v_{r}$ ln (M₀ / Mf)

Where v are the velocities, final, initial and relative and M the masses

The data they give are the relative velocity (see = 2000 m / s) and the initial mass the mass of the loaded rocket (M₀ = 5Mf)

We consider that the rocket starts from rest (v₀ = 0)

At the time of burning half of the fuel the mass ratio is that the current mass is

M = 2.5 Mf

$v_{f}$ - 0 = 2000 ln (5Mf / 2.5 Mf) = 2000 ln 2

$v_{f}$ = 1,386 m / s

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3 years ago

The momentum of an object is not dependent on which one of the following quantitiesa) acceleration b) inertiac) massd) velocity

amm1812

Answer:

Inertia

Explanation:

We have to find that on which quantity the momentum of an object does not depend.

We know that

Momentum of object=mv

Where m=Mass of object

v=Velocity of object

Momentum of object depends upon mass and velocity.

When velocity of object increases then momentum is also increases.

When the mass of object is increases then the momentum of object is also increases.

If mass decreases then the momentum of object decreases.

If velocity decreases then the momentum of object decreases.

Acceleration depends on velocity because

Acceleration= $\frac{dv}{dt}$

Therefore, momentum is also depend upon the velocity.

Inertia is defined as the property of object that resist change in its motion.

Therefore, momentum does not depend on Inertia of object.

7 0

3 years ago