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3 years ago

how is acceleration related to force when mass is constant , according to Newton’s second law of motion

1 answer:

8 0

The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

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What is the efficiency (w/qh) of an ideal carnot heat engine operating between a hot region at t= 400 k and a cold one at t= 300

Vinvika [58]

The efficiency of an ideal Carnot heat engine can be written as:
$\eta = 1- \frac{T_{cold}}{T_{hot}}$
where
$T_{cold}$ is the temperature of the cold region
$T_{hot}$ is the temperature of the hot region

For the engine in our problem, we have $T_{cold}=300 K$ and $T_{hot}=400 K$ , so the efficiency is
$\eta= 1 - \frac{300 K}{400 K}=0.25$

4 0

3 years ago

If 5000Pa a pressure is exerted on an object with the contact area 0.04m^2. Calculate the mass of an object

Whitepunk [10]

Pressure = 5000 Pa
Contact Area = 0.04 m^2
Acceleration due to gravity = 9.8 m/s^2
Let the force be F.
We know, Force = Pressure × Contact Area
Therefore, Force = 5000 Pa × 0.04 m/s^2
or, Force = 200 N
We know, force = mass × acceleration
Therefore, mass = force ÷ acceleration
or, mass = 200 N ÷ 9.8 m/s^2 = 20.4 Kg

Answer:

20.4 Kg

Hope you could understand.

If you have any query, feel free to ask.

6 0

2 years ago

What is the wavelength of an earthquake that shakes you with a frequency of 10.0 Hz and gets to another city 84.0 km away in 12.

Harrizon [31]

Answer:

700 m.

Explanation:

Wavelength: This can be defined as the distance in meter required by a wave to complete one oscillation. The S.I unit of of wavelength is meter (m).

the expression connecting velocity, frequency and wavelength is given as,

v = λf......................... Equation 1

Where v = velocity of the earthquake, λ = wavelength of the earthquake, f = frequency of the earthquake.

make λ the subject of the equation

λ = v/f ................. Equation 2

recall,

v = distance/time

v = d/t ................. Equation 2

Where d = distance, t -= time.

Given: d = 84 km = 84000 m, t = 12 s.

Substitute into equation 2

v = 84000/12

v = 7000 m/s.

Also given: f = 10 Hz.

Substitute into equation 2

λ = 7000/10

λ = 700 m.

Hence the wavelength of the earthquake = 700 m.

5 0

4 years ago

Read 2 more answers

How do you do equilibrium? Can someone explain?

Digiron [165]

Answer:

Dynamic equilibrium is when the products and the reactants are forming at the same rate. This means that the backward and forward reaction rates are equal.

I hope this helps.

5 0

3 years ago

How you can prevent thermal energy from moving by conduction, convection, and radiation?

Vanyuwa [196]

Answer:

Using insulating materials is the best way to prevent heat transfer by conduction and convection. Insulating materials are poor conductors of thermal energy and also limit the movement of air in spaces, reducing convection. Insulation slows the rate at which unwanted energy enters the home in the summer.

Explanation:

Easy peasy.

5 0

3 years ago

Read 2 more answers