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mariarad [96]
3 years ago
14

Can concave lens be used to make hand lens .why?​

Physics
1 answer:
mario62 [17]3 years ago
8 0

Answer:

No concave lens cannot be used to make hand lens because in hand Lens we use convex lens so as to converge the rays of the light After refraction and helps to produce a magnified image of an object.

Hope it will help you :)❤

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A 50.0-kg child stands at the rim of a merry-go-round of radius 2.00 m, rotating in such a way that it makes one revolution in 2
Vaselesa [24]

Answer:

2.01

Explanation:

First, we need to find the centripetal acceleration.

We're given that the merry go round rotates 1 revolution in 2.09 seconds. Converting to rpm, we know that it rotates 30 revolution per minute

Now this speed gotten in rpm will be converted to m/s, to ease the calculation

30 rpm = πdN/60 m/s

30 rpm = (3.142 * 4 * 30)/60

30 rpm = 377.04/60

30 rpm = 6.284 m/s

a(c) = v²/r

a(c) = 6.284²/2

a(c) = 39.49 / 2

a(c) = 19.74 m/s²

F = ma

F = 50 * 19.74

F = 987 N

Also, Normal Force, F(n) =

F(n) = mg

F(n) = 50 * 9.81

F(n) = 490.5

We then use this to find the coefficient of static friction, μ

μ = F/F(n)

μ = 987 / 490.5

μ = 2.01

7 0
3 years ago
A hammer is used to hit a nail into a board. Which statement is correct about the forces at play between the nail and the hammer
Studentka2010 [4]

Answer:

The nail exerts an equal force on the hammer in the opposite direction.

Explanation:

The Newtons third law states that there is an equal an opposite reaction for every action. When hammer pushes the nail, the nail will push the hammer back in opposite direction. When the hammer hits a nail then nail will exert the equal and opposite force to the hammer. These both objects will exert force on each other in opposite directions.

3 0
4 years ago
Which answer shows a balanced nuclear equation for the alpha decay of plutonium-239
Sergio [31]

Answer: An alpha particle is a helium-4 nucleus, it contains gwo protons and two neutrons. So, alpha decay, giving off an alpha particle, does the following:

1)reduces the atomic number (number of just protons) by two. Plutonium has atomic number of 94, take two protons away and you are left with 92 which corresponds to uranium.

2) reduces the mass number (protons plus neutrons) by 4. If you start with 239 and subtract two protons and two neutrons, you are left with 235.

Explanation:

7 0
3 years ago
According to Coulomb’s law, the force between two charges acts along the straight line joining the charges. The force is directl
Scorpion4ik [409]

Answer:

D) the universal law of gravitation.

Explanation:

Based on the statement of the Coulomb's law, it is easy to conclude that the law is similar to the universal law of gravitation.

Newton's law of universal gravitation is one of the most interesting physical laws out there.

It states that "the gravitational force of attraction between two bodies is directly proportional to the product of their masses and inversely proportional to the square of the distances between the charges".

Recalling the coulomb's law, we can clearly see that both shows a direct proportionality of force to quantity of charges/mass and inverse proportionality to the square of the distances between them.

3 0
3 years ago
The atomic number of magnesium is 12. This means that its nucleus must contain
lana [24]
<span>The correct answer is D) 12 protons and no electrons. This is correct because the number of protons in the nucleus of the atom is 12. The number of protons in the nucleus represents the atomic number. Therefore if there are 12 protons in the nucleus, the atomic number is 12.</span>
4 0
3 years ago
Read 2 more answers
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