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Citrus2011 [14]
2 years ago
12

Choose the true statements about electric fields and forces. (Choose 3)

Physics
1 answer:
aleksley [76]2 years ago
3 0

Answer:

The three best answers are:

Electric fields can be positive or negative  (depending on source)

Electric fields can attrace or repel objets         (assuming the object is charged)

Electric forces are strongest near the charged object       E ∝ 1 / R^2

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A ball hits a wall horizontally at 6m/s and rebounces at 4.4m/s the ball is in contact with wall for 0.04 sec. what is the accel
Svetlanka [38]

Answer:

Acceleration (a) = 40 m/s²

Explanation:

Given:

Initial velocity (u) = 6 m/s

Final velocity (v) = 4.4 m/s

Time taken (t) = 0.04sec

Find:

Acceleration (a) = ?

Computation:

We know that,

⇒ v = u + at

⇒ a = (v - u) / t

⇒ Acceleration (a) = (4.4 - 6) / 0.04

⇒ Acceleration (a) = (-1.6) / 0.04

Acceleration (a) = 40 m/s²

8 0
3 years ago
How many meters are in 45 centimeters?
adell [148]

Explanation:

100 CM = 1 m

45 CM = 45 / 100 = 0.45 m

hope it helps:)

6 0
3 years ago
Read 2 more answers
The highest occupiable floor of any building is in the Sears Tower in Chicago. The elevators of the central tower of the buildin
irina1246 [14]

Answer:

9727160J

Explanation:

Given parameters:

Height of elevator rise  = 436m

Force exerted  = 22310N

Unknown:

Work done by the elevator lifting mechanism = ?

Solution:

The work done by a body is the force applied to move a body in a specific direction;

          Work done  = force x distance moved

In this case, the force and distance moved is provided already;

        Work done  = 22310 x 436  = 9727160J

3 0
3 years ago
The mass of an astronaut in space will be:
Serhud [2]
The answer would be less, no problem buddy.
6 0
3 years ago
When ammonium chloride and water interact, less energy is released from breaking the bonds in the water and ammonium chloride th
Paul [167]

Answer;

An endothermic reaction is occurring.

Explanation;

-An endothermic reaction describes the process or reaction in which the system absorbs energy from its surroundings, usually in the form of heat.

-It occurs when the energy used to break the bonds in the reactants is greater than the energy given out when bonds are formed in the products. This means that overall the reaction takes in energy, therefore there is a temperature decrease in the surroundings.

-The opposite of endothermic reaction is called exothermic reaction where heat released is more than what is required to the surroundings in form of heat.

8 0
3 years ago
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