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QveST [7]
3 years ago
14

2 questions, brainliest if correct. please only answer if you really know!

Physics
2 answers:
natta225 [31]3 years ago
7 0

Answer:

[a] Friction is a force.

[c] An unbalanced force is necessary to cause a non-moving object to start moving.

Explanation:

Friction is a force that exerts oppositely from an objects motion, mostly by its surface. The smoothness and roughness of the surface depends on how much friction it has, friction is a type of force.

Unbalanced forces are what causes objects that aren't moving to move. For example, wind causes a kite to sway in the sky. Wind, in this situation, is the source of unbalance force.

Iteru [2.4K]3 years ago
3 0

Answer:

<h2>1. Friction is A. a force</h2>

<h2>2. An unbalanced force is B. When the object moves and accelerates</h2>
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A proton with a velocity in the positive x-direction enters a region where there is a uniform magnetic field B in the positive y
blsea [12.9K]

Answer:

Negative z-direction

Explanation:

First of all, we need to understand the direction of the magnetic force on the proton. This can be determined by using the right hand rule. So we have:

- index finger: direction of the proton, positive x-direction

- middle finger: direction of magnetic field, positive y-direction

- thumb: direction of the force, positive z-direction

In order to balance this magnetic force, the electric force must act in the opposite direction (negative z direction). Since for a proton (positive charge) the force and the electric field have same direction, it means that the electric field must also be in the negative z direction.

3 0
3 years ago
Difference between dynamo and generator
QveST [7]

Answer:

Dynamos and Generators convert mechanical rotation into electric power.

Dynamo - a device that makes direct current electric power using electromagnetism

Generator - used to describe an alternator that creates AC power using electromagnetism.

Explanation: so dynamo makes direct electric power using electromagnetism. A generator creates AC power using electromagnetism

5 0
3 years ago
A hollow circular shaft made of 304 stainless steel uniformly tapers from an outer diameter of 3.0 cm to an outer diameter of 4.
mojhsa [17]

Answer:

maximum shear stress = τ(max) = 95.49 × 10⁶N/m²

Explanation:

given

outer diameter at one end(D₁) = 3.0cm

outer diameter at the other end(D₂) = 4.0cm

inner diameter(d₁) = 1.0cm

torque applied(T) = 500Nm

maximum shear stress will occur at lower outer diameter

the formula is τ/r = T/J

τ= T × r/J

where r is radius

T is the torque

J is the polar 2nd M of area

attached is the calculation of the question

7 0
4 years ago
Where does the energy released in a nuclear decay reaction come from
erastovalidia [21]
The answer is electrons
8 0
2 years ago
Predictions about the future based on the position of planets is an example of
tatyana61 [14]
Predictions about the future based on the position of planets is an example of astrology.
Hope this helps! :)
6 0
3 years ago
Read 2 more answers
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