PHYSICS HIGH SCHOOL

the density of dead sea surface water is about 1.166 g/ml. how much mass, in grams, would 2 liters of this salty water have?

Answers

Answer 1
Answer: Density is a value for mass, such as kg, divided by a value for volume, such as m^3. Density is a physical property of a substance that represents the mass of that substance per unit volume. The mass of the salty water is calculated as follows:

Mass = 1.166 g/mL ( 2000 mL ) = 2332 g of salty water

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COLLEGE

An aluminum wire with a diameter of 0.125 mm has a uniform electric field of 0.305 V/m imposed along its entire length. The temperature of the wire is 45.0° C. Assume one free electron per atom. (a) What is the current density in the wire?
(b) What is the total current in the wire?

Answers

Answer:

(a) Current density is 1.05 x 10⁷ A/m²

(b) Total current in the wire is 0.129 A.

Explanation:

As in the problem, the resistivity of aluminium is not mention. SO, we consider the case in which resistivity of aluminium is 2.65 x 10⁻⁸ ohm m at 20⁰ C.

The resistivity of the material depend upon the temperature by the equation:

р = р₀ [1 + α(T - T₀) ]

Here р is resistivity at temperature T, р₀ is resistivity at temperature T₀ and

α is constant.

Put 2.65 x 10⁻⁸ ohm m for р₀, 45° C for T, 20° C for T₀ and 3.9 x 10⁻³ /°C for α in the above equation.

р =

р = 2.90 x 10⁻⁸ ohm m

(a) The relation between electric field and current density is:

J = E/р

Substitute 0.305 V/m for E and 2.90 x 10⁻⁸ ohm m for р in the above equation.

J =

J = 1.05 x 10⁷ A/m²

(b) The relation between current and current density is :

I = J x A

Here A is the area.

Area of wire, A = π (d/2)²

Here d is the diameter of the wire.

So, I = J x π (d/2)²

Substitute 1.05 x 10⁷ A/m² for J and 0.125 x 10⁻³ m for d in the above equation.

I =

I = 0.129 A

HIGH SCHOOL

How are important properties of Mercury, Venus, and Mars different from important properties of Earth?

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Hi there,

There is one thing that is the most difference about other planets. Earth is a perfect condition for humans, animals, and other living things. Venus and Mars are not quite good for that. Venus has a very HOT surface, which makes it nearly impossible to be on. Mars on the other hand is very COLD, colder than earth because it is farther from the sun.
COLLEGE

A ball is whirled on the end of a string in a horizontal circle of radius R at const v. By which one of the following means can the centripetal acceleration of the b increased by a factor of two? 13. Keep the radius fixed and increase the period by a factor of two. Keep the radius fixed and decrease the period by a factor of two. Keep the speed fixed and increase the radius by a factor of two. Keep the speed fixed and decrease the radius by a factor of two. A) B) C) D)

Answers

Answer:

D

Explanation:

Centripetal acceleration is the square of velocity divided by radius:

a = v² / r

Velocity is equal to angular velocity times radius, so this can also be written as:

a = ω² r

And angular velocity is 2π divided by the period, so:

a = (2π / T)² r

We can use these two equations to determine which scenario results in double the centripetal acceleration.

A) Keep the radius fixed and increase the period by a factor of two.

(2π / 2T)² r

1/4 (2π / T)² r

1/4 a

B) Keep the radius fixed and decrease the period by a factor of two.

(2π / ½T)² r

4 (2π / T)² r

4a

C) Keep the speed fixed and increase the radius by a factor of two.

v² / 2r

1/2 a

D) Keep the speed fixed and decrease the radius by a factor of two.

v² / ½r

2a

Only D doubles the centripetal acceleration.

HIGH SCHOOL

The force of an apple hitting the ground depends on

Answers

I believe it depends on gravity and KE(kinetic energy0
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