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2 years ago

1.A wagon with a mass of 20 kg is accelerating at 0.5 m/s2. What is the force on it?

Physics

1 answer:

erik [133]2 years ago

3 0

1). Force = (mass) x (acceleration)

Force = (20 kg) x (0.5 m/s )

Force = 10 Newtons

2). Force = (mass) x (acceleration)

In this case, the acceleration is the acceleration of gravity.

1 N = (mass) x (9.8 m/s )

Mass = (1 N) / (9.8 m/s )

Mass = 0.1 kg

3). Force = (mass) x (acceleration)

This formula is important. Memorize it !

You saw here that the same formula answered both of your questions.

It'll answer a lot more Physics questions that you haven't seen yet.

If you're taking a Physics class, there will DEFINITELY be at least one question on the final exam that will test you to see whether you know this formula and how to use it. Maybe more than one.

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:What will be the value of the refractive index of the medium? Critical angle of that medium is 30 degree

earnstyle [38]

Answer:

Let the second medium be air (n₁=1)

The refractive index n₂ of the medium where first medium is air is found (a)

(a) n₂ = 2

Explanation:

Critical angle can be defined as the angle of incidence that provides the angle of refraction of 90°.

Refractive index of a medium can be defined as a number that describes that how fast a light will travel through that medium.

Critical angle and Refractive index are related by:

$\theta_{critical}= sin^{-1}(\frac{n_1}{n_2})$

$sin \theta_{critical}=\frac{n_1}{n_2}$

To find refractive index of medium with respect to air, substitute n₁=1 (Refractive index of air is 1)

Also θ(critical)=30°

Find n₂ :

$sin30= \frac{1}{n_2}\\0.5=\frac{1}{n_2}\\n_2=\frac{1}{0.5}\\n_2=2$

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2 years ago

Write the answer: physics ... i need help

Mariana [72]

Answer:

6 gallons

Explanation:

At 30 mph, the fuel mileage is 25 mpg.

After 5 hours, the distance traveled is:

30 mi/hr × 5 hr = 150 mi

The amount of gas used is:

150 mi × (1 gal / 25 mi) = 6 gal

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3 years ago

(b) Two electrons in the same atom both have n = 3 and I = 1. Assume the

wolverine [178]

Answer:

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2 years ago

if heat energy is transferred from direct contact between a warm and a cold object it has been transferred by what ?

Katarina [22]

When heat energy is transferred from direct contact between a warm and a cold object , it is known as heat transfer by conduction.

In conduction, the heat transfer takes place within an object or between two objects in contact until the temperature becomes uniform. this kind of heat transfer continues until the temperature at two ends between which the heat transfer take place , becomes equal. Heat transfer takes place from point at high temperature to point at lower temperature.

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3 years ago

Which planet weighs twice as much as all other planets.

Bumek [7]

Answer:

Jupiter. Although it is a gas planet, it has a ton of mass. Mass can determine the weight of an object. We can thereby assume that Jupiter weighs way more than most planets.

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2 years ago