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3 years ago

In which of these samples do the molecules most likely have the most kinetic energy? (2 points)

1 answer:

4 0

D, water vapor. Gaseous state would have more kinetic energy, they are moving faster. If you have to compare the same state, then higher temperature would have the higher kinetic energy. But if you have solid and liquid at the same temperature - then liquid would have more.

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A force of 1.50 N acts on a 0.20kg trolley so as to accelerate it along an air track

Veseljchak [2.6K]

Answer:

2.12m/s

Explanation:

Given parameters:

Force on trolley = 1.5N

Mass of trolley = 0.2kg

Unknown:

Velocity of the trolley = ?

Solution:

To solve this problem, we first find the acceleration of the trolley;

Force = mass x acceleration

Acceleration = $\frac{Force }{mass}$

Insert the parameters and solve;

Acceleration = $\frac{1.5}{0.2}$ = 7.5m/s²

Now to find the acceleration;

Initial velocity = 0m/s

v² = u² + 2aS

v is the final velocity

u is the initial velocity

a is the acceleration

S is the distance

Distance = 30cm and this is 0.3m

v² = 0² + 2(7.5)0.3 = 4.5

v = √4.5 = 2.12m/s

8 0

3 years ago

A force is applied to the rim of a disk that can rotate like a merry-go-round, so as to change its angular velocity. Its initial

yawa3891 [41]

Answer:

A = B = C > D

Explanation:

Work done to stop the disc is given as

$W = \Delta K$

$W = \frac{1}{2}I(\omega_f^2 - \omega_i^2)$

so we have

(a) –2 rad/s, 5 rad/s;

(b) 2 rad/s, 5 rad/s;

(d) 2 rad/s, –5 rad/s.

So we have

$W_a = W_b = W_c = \frac{1}{2}I(5^2 - 2^2)$

$W_d = \frac{1}{2}I(2^2 - 5^2)$

so we have

A = B = C > D

5 0

3 years ago

Define are sources of energy

OleMash [197]

$\boxed{\sf{QUESTION:}}$

Define sources of energy

$\boxed{\sf{ANSWER:}}$

Energy is the capacity of a body to do work.

We Classify the sources of energy on the basis of:

Occurence:

Natural Sources: Natural energy sources are those which are made available to us by nature. Solar energy, wind energy, energy from water (hydro energy) are some of such natural sources of Energy.
Synthetic Sources: Synthetic energy are those that use man-made materials as sources of energy. Fir example, chemical energy, stored in the batteries, (used in calculators, watches, etc.) is a synthetic source of energy.

Physical State:

Solid: Firewood, Charcoal, coal are examples of solid fuels.
Liquid: Kerosene, Petrol & diesel are all liquid fuels.
Gas: Petroleum gas, commonly used as LPG (Liquified Petroleum Gas), & natural gas, also used CNG (Compressed Natural Gas), are examples of gaseous fuels

Availability:

Renewable: A renewable source of energy is a natural resource that can replenish itself naturally over a short period of time. Wind, sun, biomass (from plants) & hydropower (from water) are all renewable sources of energy. These arr inexhaustible natural resources.
Non-renewable: Energy sources which get us & cannot be replaced or replenished in a short period of time are called non-renewable sources of energy. These are also called exhaustible natural resources. Fossil fuels, (like petroleum, natural gas & coal), are non-renewable sources of energy.

<h2>Hope It's Helped! :D</h2>

6 0

3 years ago

The magnitude of the electric force between two particles depends on which factors

lubasha [3.4K]

Directly proportional to the product of the two charges and inversely proportional to the square of the distance between them

3 0

3 years ago

What are the strengths and limitations of the doppler and transit methods? What kind of planets are easiest to detect with each

Arturiano [62]

$\huge\mathfrak\red{✔Answer:-}$

Strength: able to detect planets in a wide range of orbits, as long as orbits aren't face on

Limitations: yield only planet's mass and orbital properties

3 0

3 years ago