1 point

The more particles a substance has at a given temperature, the more thermal energy it has.

olasank [31]

The statement 'The more particles a substance has at a given temperature, the more thermal energy it has' is true. The kinetic molecular theory of gases has three main laws and one of them is the average kinetic energy of the particles in a gas. The average kinetic energy of the gas particles is the behavior and movement it does in the surroundings. It is directly proportional to temperature wherein if you increase the temperature, the kinetic energy of a particle also increases. It will also decrease its movement or its kinetic energy if the temperature lowers.

5 0

3 years ago

If you and your friend EACH apply 55N of force pushing against a wall for 10 minutes. How much work did you do?

iris [78.8K]

Answer:

0 Joules

Explanation:

If you are pushing against a wall, the wall is not moving, so no work is being done.

8 0

3 years ago

A _____ has a definite ratio of components

user100 [1]

A compound has a definite ratio of components

6 0

4 years ago

Read 2 more answers

numerade A 62 kg bungee jumper jumps from a bridge. She is tied to a bungee cord whose unstretched length is 12 m. She falls a t

GalinKa [24]

Answer:

k = 104.5 N/m

Explanation:

When she reaches the lowest point the velocity of the jumper is 0. This means all her kinetic energy has been absorbed by the cord.

The energy absorbed by a spring (a cord can be treated as a spring when it's being stretched) is:

$Ee = \frac{1}{2}*k*\Delta x^{2}$

Where:

Ee = elastic potential energy

k = elastic constant

Δx = lenght the spring was stretched

When a body falls, it's potential gravitational energy is converted to kinetic energy. So the kinetic energy of a body can be calculated as the gravitational potential energy it lost.

The gravitational potential energy is:

$Ep = m * g * \Delta h$

Where:

Ep: potential gravitational energy

m: mass

g: acceleration of gravity

Δh: change of height (final - initial)

When she has fallen 31 m she has lost

62 kg * 9.81 m/s^2 * 31 m = 18854 J

Since her velocity at the bottom is 0, her kinetic energy is 0 J.

All her kinetic energy has been absorbed by the cord and transformed into elastic potential energy. So we can equate these two energies.

Ep = Ee

Then:

$Ep = \frac{1}{2}*k*\Delta x^{2}$

Δx = 31 m - 12 m = 19 m

From here the only unknown is k:

$k = 2 * Ep / (\Delta x ^{2})$

$k = 2 * 18854 J / ((19 m) ^{2}) = 104.5 N/m$

3 0

3 years ago

Which of the following is the kinetic rate equation for the addition-elimination mechanism of nucleophilic aromatic substitution

Helga [31]

Answer:

Rate = k[aryl halide][nucleophile]

Explanation:

The simple aryl halides are almost inert to usual nucleophilic reagents but considerable activation on the ring can be produced by the addition of strongly electron-attracting substituents on either the ortho or para positions, or both. These groups deactivate the ring to allow the attack of the nucleophille on the ring.

Thus, these reactions can occur by following addition-elimination mechanism in which the nucleophille first attacks the aryl halide and then the elimination of the leaving group takes place.

Kinetic studies of this type of mechanism demonstrate that the reactions are of second-order kinetics– first order w.r.t. nucleophile and also, first-order w.r.t. aromatic substrate. The rate determining step (r.d.s.) is the formation of the addition intermediate.

Thus,

Rate = k[aryl halide][nucleophile]

7 0

3 years ago