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3 years ago

A negatively charged rod is brought near a neutral metal sphere. which of the following is true?

1 answer:

Studentka2010 [4]3 years ago

7 0

If a negatively charged rod is brought near a neutral metal sphere, no attraction would happen since the neutral sphere has no available positive charges. So, the rod won't be attracted to the sphere. Hope this answers the question. Have a nice day.

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Math Practice: Cart A loaded with blocks (600g) moving left at 0.7m/s hits stationary cart B (200g).

Vika [28.1K]

Answer:

The velocity of cart B after the collision is 1.29 m/s.

Explanation:

We can find the velocity of cart B by conservation of linear momentum:

$p_{i} = p_{f}$

$m_{A}v_{A_{i}} + m_{B}v_{B_{i}} = m_{A}v_{A_{f}} + m_{B}v_{B_{f}}$

Where:

$m_{A}$ is the mass of cart A = 600 g = 0.6 kg

$m_{B}$ is the mass of cart B = 200 g = 0.2 kg

$v_{A_{i}}$ is the inital velocity of cart A = 0.7 m/s

$v_{A_{f}}$ is the final velocity of cart A = 0.27 m/s

$v_{B_{i}}$ is the initial velocity of cart B = 0

$v_{B_{f}}$ is the final velocity of cart B =?

Taking the left direction as the positive horizontal direction:

$0.6 kg*0.7 m/s + 0 = 0.6 kg*0.27 m/s + 0.2 kg*v_{B_{f}}$

$v_{B_{f}} = 1.29 m/s$

Therefore, the velocity of cart B after the collision is 1.29 m/s.

I hope it helps you!

5 0

3 years ago

An experiment proposes a possible explanation for a natural phenomenon. A experiment must be stated in a way that it can be test

scZoUnD [109]

Answer:

a) False.

b) True.

c) Flase.

Explanation:

a) An experiment proposes a possible explanation for a natural phenomenon.

False: An experiment doesn't propose possible explanation for a natural phenomenon. Actually, an experiment is designed to test already proposed explanations which normally are first developed in a more theorical context.

b) A experiment must be stated in a way that it can be tested by experiments.

True.

b) An experiment is a theory that has been validated many times by many scientists.

Flase: An experiment is no a theory, but a tool to test theories.

8 0

3 years ago

Which describes the ability to do work or to cause change?

kondaur [170]

To do work is to use your energy

8 0

4 years ago

Sound will not travel through A. A vacuum B. Solids C. Liquids D. Gases

NARA [144]

Sound will not travel through A vacuum

3 0

3 years ago

When a charged particle moves along a helical path in a uniform magnetic field, which component determines the pitch of the path

Llana [10]

Answer:

the velocity component parallel to the magnetic field vector

Explanation:

When a charged particle moves in a helical path, we can decompose its velocity into two parts v_parallel and v_perpendicular to the magnetic field.

Let's analyze which component receives a force

F = q vxB

the bold letters indicate vectors, in the vector product if the two vectors are parallel the angle is zero and the sin 0 = 0 for which there is no force. therefore the velocity parallel to the field remains constant

If the two vectors are perpendicular, the angle is 90º and the sin 90 = 1, for which there is a force, which has a radial direction and consequently a centripetal acceleration that gives a circular path that does not remove the particle from the magnetic field

When checking the different answers, the correct one is: the velocity component parallel to the magnetic field vector

3 0

3 years ago