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lana [24]
3 years ago
13

Why is there an upward force on objects in water?

Physics
2 answers:
ludmilkaskok [199]3 years ago
6 0
From pressure, so if you had a pot and turned it upside down and put it in water then turned it on its side the air bubbles would come out but if you kept trying to push it down it would get harder just like an inflatable boat if u turned it upside down tried to pull it under water you couldnt because of the pressure hope this helps can u mark brainliest please
prisoha [69]3 years ago
3 0
This is due to water pressure
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Over the time interval after a difference in potential is applied between the ends of a wire, what would happen to the drift vel
Dmitrij [34]

The the drift velocity of the electrons is determined by atom vibrations in the crystal lattice.

<h3>How to explain the information?</h3>

Assume we could increase the average time between collisions in a typical metal to get to a limit of zero resistance. The free electrons would therefore be continuously accelerated by a constant applied voltage, according to the classical paradigm of conduction. Both the current and the drift speed would gradually pick up over time.

Although it is not the scenario implied by the question, it is possible to switch to zero resistance by using a superconducting wire instead of the usual metal. In this scenario, the maximum current is constrained, the drift velocity of the electrons is determined by atom vibrations in the crystal lattice, and it is difficult to produce a potential difference across the superconductor.

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5 0
1 year ago
Scientists observe an approaching asteroid that is on a collision course with
nasty-shy [4]

Answer:

The approximate velocity the rocket must have to stop the asteroid completely after the collision is;

C. -324 m/s

Explanation:

The parameters of the asteroid and the rocket are;

The mass of the asteroid, m₁ = 11,000 kg

The initial velocity with which the asteroid is approaching Earth, v₁ = 50 m/s

The mass of the rocket, m₂ = 1700 kg

The initial velocity of the rocket = v₂

The final velocity of the combined asteroid and rocket after the collision, v₃ = 0 m/s

By the law of conservation of linear momentum, we have;

The total initial momentum = The total final momentum

m₁·v₁ + m₂·v₂ = (m₁ + m₂)·v₃

Substituting the known values, we get;

11,000 kg × 50 m/s + 1,700 kg × v₂ = (11,000 kg + 1,700 kg) × 0 m/s

11,000 kg × 50 m/s + 1,700 kg × v₂ = 0

∴ 1,700 kg × v₂ = -11,000 kg × 50 m/s

v₂ = (-11,000 kg × 50 m/s)/(1,700 kg) = -323.529412 m/s ≈ -324 m/s

The approximate initial velocity the jet must have to completely stop the asteroid after the collision is -324 m/s.

3 0
3 years ago
Mercury is in the 80th position in the periodic table. How many protons does it have?
Verdich [7]
Mercury has 80 protons. Ironic? 
7 0
3 years ago
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A brick of mass 2.3 kg is lifted to a height of 1.9 m. How much gravitational potential energy is added to the brick? Accelerati
yan [13]
PE = mgh = (2.3 kg)(9.8 m/s²)(1.9 m) = 42.8 J
4 0
3 years ago
Read 2 more answers
A 1,198 N sky diver has opened his parachute to slow his descent to a constant speed the parachute applies 1,277 N of force. He
Savatey [412]

The mass of the skydiver is 122.2 kg

Explanation:

We can solve the problem by using the concept of weight.

The weight of a body is the force of gravity acting on the body; near the Earth's surface, its magnitude is given by

W=mg

where

m is the mass of the body

g=9.8 m/s^2 is the acceleration of gravity

In this problem, we know the weight of the skydiver:

W = 1198 N

So we can re-arrange the equation to find its mass:

m=\frac{W}{g}=\frac{1198}{9.8}=122.2 kg

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6 0
4 years ago
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