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damaskus [11]
4 years ago
9

2. The water is then heated to its boiling point. Calculate the specific latent heat of

Physics
1 answer:
Law Incorporation [45]4 years ago
6 0

Answer:

2465 J/g

Explanation:

The amount of energy required to boil a sample of water already at boiling point is given by

Q=m\lambda_v

where

m is the mass of the water sample

\lambda_v is the specific latent heat of vaporization of water

In this problem, we know

Q=813,600 J

m = 330 g

Solving the equation for \lambda_v, we find

\lambda_v = \frac{Q}{m}=\frac{813600}{330}=2465 J/g

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A crane raises a crate with a mass of 150 kg to a height of 20 m. Given that
Virty [35]

Answer:

\boxed {\boxed {\sf 29,400 \ Joules}}

Explanation:

Gravitational potential energy is the energy an object possesses due to its position. It is the product of mass, height, and acceleration due to gravity.

E_P= m \times g \times h

The object has a mass of 150 kilograms and is raised to a height of 20 meters. Since this is on Earth, the acceleration due to gravity is 9.8 meters per square second.

  • m= 150 kg
  • g= 9.8 m/s²
  • h= 20 m

Substitute the values into the formula.

E_p= 150 \ kg \times 9.8 \ m/s^2 \times 20 \ m

Multiply the three numbers and their units together.

E_p=1470 \ kg*m/s^2 \times 20 m

E_p=29400 \ kg*m^2/s^2

Convert the units.

1 kilogram meter square per second squared (1 kg *m²/s²) is equal to 1 Joule (J). Our answer of 29,400 kg*m²/s² is equal to 29,400 Joules.

E_p= 29,400 \ J

The crate has <u>29,400 Joules</u> of potential energy.

7 0
3 years ago
As a pole of a 2nd-order discrete-time system moves away from the origin in the z-plane, while its phase remains constant, the d
Rudik [331]

Answer:

False

Explanation:

When the location of the poles changes in the z-plane, the natural or resonant frequency (ω₀) changes which in turn changes the damped frequency (ωd) of the system.

As the poles of a 2nd-order discrete-time system moves away from the origin then natural frequency (ω₀) increases, which in turn increases damped oscillation frequency (ωd) of the system.

ωd = ω₀√(1 - ζ)

Where ζ is called damping ratio.

For small value of ζ

ωd ≈ ω₀

4 0
3 years ago
You are driving a metric car that has a speedometer that displays in meters per second. When you look down at your speedometer,
Otrada [13]

Answer:

0.33m/s²

Explanation:

Given parameters:

Initial velocity  = 19.9m/s

Final velocity  = 4.4m/s

Time  = 47.6s

Unknown:

Acceleration  = ?

Solution:

To solve this problem, we use the expression below:

     Acceleration  = \frac{v - u }{t}

v is the final velocity

u is the initial velocity

 t is the time taken

    Acceleration  = \frac{4.4  - 19.9}{47.6}  

    Acceleration = -0.33m/s²

This is a deceleration

6 0
3 years ago
0. The temperature of source is 500K with source energy 2003, what is the temperature of sink with sink energy 100 J? a. 500 K b
andreev551 [17]

Answer:

c. 250k

Explanation:

4 0
3 years ago
A sphere made of iron has a diameter of 4.99cm What is the mass of the sphere?
Gwar [14]

Answer:

Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that, through cellular respiration, can later be released to fuel the organism's activities.

Explanation:

4 0
3 years ago
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