Physics, 20.01.2021 14:00 heavyhearttim

Calculate the energy of 1kg of concrete from 20⁰c to 30⁰c

Answers: 3

Show answers

Answers

Answer from: kaitie60

9 kilojoules of energy are stored in a kilogram of concrete due to sensible heat.

Explanation:

In this exercise we need to determined the sensible heat store in a kilogram of concrete due to a change in temperature. Sensible heat (), measured in kilojoules, is defined by the following expression:

$Q = m\cdot c\cdot (T_{f}-T_{o})$ (1)

Where:

- Mass, measured in kilograms.

- Average specific heat of concrete, measured in kilojoules per kilogram-degree Celsius.

$T_{o}$ , $T_{f}$ - Initial and final temperatures of concrete, measured in degrees Celsius.

If we know that $m = 1\,kg$ , $c = 0.9\,\frac{kJ}{kg\cdot ^{\circ}C}$ , $T_{o} = 20\,^{\circ}C$ and $T_{f} = 30\,^{\circ}C$ , then the energy store in a kilogram of concrete is:

$Q = (1\,kg)\cdot \left(0.9\,\frac{kJ}{kg\cdot ^{\circ}C} \right)\cdot (30\,^{\circ}C-20\,^{\circ}C)$

$Q = 9\,kJ$

9 kilojoules of energy are stored in a kilogram of concrete due to sensible heat.

Answer from: Quest

small = small current large mag large current

Answer from: Quest

m₁v₁ + m₂v₂ = (m₁ + m₂)vmomentum is conserved.the left-hand side of the equation represents the momentum in the system before the collision.the right-hand side represents the momentum in the system after the collisionm₁ and v₁ represents the mass and the velocity of the physics blockm₂ and v₂ represents the mass and velocity of the ball of puttyv represents the final velocity of the combined mass.the question states the two masses stick together. they combined mass has its own velocity with the body mass the sum of the two objects' massestheir combined momentum is (m₁ + m₂)vto find the magitude of (m₁ + m₂)v, we need to add the vectors on the left-hand side of the equation: m₁v₁ + m₂v₂.note the diagram. i have positioned the vectors in accordance with their directions.the magnitude of the resultant can be calculated using the pythagorean theorem since this is a right triangle situation (north and west are perpendicular)|(m₁ + m₂)v| = √[ (m₁v₁)² + (m₂v₂)² ]|(m₁ + m₂)v| = √[ (1.5kg·8.0m/s)² + (0.40kg·20m/s)² ]|(m₁ + m₂)v| = 14.4 kg m/sfor two significant figures (assuming that 20m/s is two), this rounds to 14 kg m/s

Another question on Physics

Physics, 21.06.2019 23:30

The velocity of car is 80.0 miles per hour. what is the velocity of car in meters per second? (1 km -0.621 miles) m/s

Answers: 2

Answer

Physics, 22.06.2019 16:00

While the change in blank will remain the same during a collision, the force needed to bring an object to a stop can be blank if the time if collision is blank

Answers: 1

Answer

Physics, 23.06.2019 03:00

Carbon tetrachloride (ccl4) is ionic or convalent

Answers: 1

Answer

Physics, 23.06.2019 11:10

If an object is thrown in an upward direction from the top of a building 1.6 x 102 ft. high at an initial velocity of 21.82 mi/h, what is its final velocity when it hits the ground?

Answers: 2

Answer

You know the right answer?

Calculate the energy of 1kg of concrete from 20⁰c to 30⁰c...

Questions