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3 years ago

Describe the movement of particles at the melting point of a substance with temperature and energy.

Physics

1 answer:

Gnesinka [82]3 years ago

7 0

Answer:

As a substance reaches the melting point, the particles begin to move faster, causing the substance to become a liquid.

Explanation:

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Liquid water at 120 kPa enters a 7-kW pump where its pressure is raised to 5.6 MPa. If the elevation difference between the exit

ziro4ka [17]

Answer:

The answer is given below

Explanation:

Things provided in the statement:

Pressure P1 = 120 kPa and P2 = 5.6 MP or 5600 kPa

Power, W = 7 kW

Elevation difference = ∆z = 10 m

Mass of flow = m˙

So potential energy changes may be significant

Specific volume of water V= 0.001 m³/kg

Now putting the values in the formula

Power, W = m˙ x V (P1 - P2) + m˙ x g x ∆z

7 = m˙ x 0.001 (5600 - 120 ) + m˙ x 9.8 x 10 x (1 kJ/kg/ 1000 m^2/s^2)

7 = m˙ x 5.48 + m˙ x 0.098

7 = m ˙x 5.38

m˙ = 7/5.38

So mass flow m˙ = 1.301 kJ/s

8 0

3 years ago

Hot air balloon with a kinetic energy of 76550J and a mass of 1890kg. what’s the velocity?

lukranit [14]

Answer:

$K.E = \frac{1}{2} m {v}^{2} \\ 76550 = \frac{1}{2} (1890) {v}^{2} \\ {v}^{2} = \frac{76550}{945} \\ = 81.005 \\ v = \sqrt{81.005} \\ v \approx \: 9m. {sec}^{ - 1}$

6 0

3 years ago

What happens overtime to rocks that are stressed

malfutka [58]

Answer:

Stress is the force applied to an object. In geology, stress is the force per unit area that is placed on a rock. Four types of stresses act on materials.

A deeply buried rock is pushed down by the weight of all the material above it. Since the rock cannot move, it cannot deform. This is called confining stress.

Compression squeezes rocks together, causing rocks to fold or fracture (break) (Figure below). Compression is the most common stress at convergent plate boundaries.

Explanation:

4 0

3 years ago

Can someone answer this.

klemol [59]

Take left to be the negative direction, and right to be positive. That means the forces on the squirrel would be -2N and 3N.

Add all the forces to find the net force on the squirrel. -2N+3N=1N

Because the positive direction is to the right, the net force of 1N is directed to the right.

4 0

3 years ago

The large blade of a helicopter is rotating in a horizontal circle. The length of the blade is 7.17 m, measured from its tip to

gayaneshka [121]

Answer:

1.789

Explanation:

let the tangential velocity at the tip of the blade (7.17m from center) be V₁ and the tangential velocity at 4.01 be V₂.

recall that tangential velocity can be related to angular velocity, ω by the following relationship:

V = rω, where V is the tangential velocity, ω is angular velocity and r = radius.

rearranging, we get

ω = V/r

We also know that at any point in the rotation, even though the tangential velocity at 7.17m radius (V₁) will be different from the tangential velocity at 4.01m radius (V₂), their angular velocity will be the same, hence we can equate:

ω₁ = ω₂, or

V₁/r₁ = V₂/r₂ (rearranging)

V₁/V₂ = r₁/r₂ -----(eq 1)

We also know that centripetal acceleration can be expressed in terms of tangential velocity and radius, i.e

a =V²/r

to find the ratio of the centripetal acceleration at the tip and at r=4.01m

a₁/a₂ = (V₁²/r₁) / ( V₂² / r₂) (rearranging & simplify)

= (V₁/V₂)² (r₂ / r₁) (substituting eq1 into equation)

= (r₁/r₂)²(r₂ / r₁) (simplifying)

= (r₁/r₂) (substituting r₁=7.17 and r₂=4.01)

= 7.17 / 4.01

= 1.789

7 0

4 years ago